محمد نوری سپهر

Antibiotics are a type of medicine that are found in different concentrations from nanograms to micrograms in water sources, and their high resistance to decomposition makes it difficult to remove them from aquatic environments. The aim of this study is to investigate the removal of tetracycline antibiotic from water environments.

In this study, modified y-type nano zeolite was synthesized for tetracycline adsorption. The properties of modified y type nano zeolite adsorbent were determined by FESEM, EDS, FTIR and XRD analysis. Then the absorption process of tetracycline was investigated.

The highest removal rate of tetracycline antibiotic was achieved at a concentration equal to 50 mg/L and a contact time of 30 min, at pH=7 and a modified nano zeolite concentration of 0.4 g/L, 97.4%. The adsorption process of tetracycline through modified nano-zeolite y was compatible with the Langmuir isotherm model (R = 0.991) and pseudo-second-order kinetics (K2 = 0.002).

The results showed that the nano adsorbent is significantly able to remove tetracycline from aqueous solutions in a short period of time. Therefore, it can be used as an effective adsorbent to remove antibiotics.

Air pollution in large cities is one of the main difficulties that have harmful effects on humans and cause various diseases including cancers. So, present study with aim of determination the relation between air pollution and Incidence rate of two most common cancer in Tehran were performed.

at first, hourly data of pollutants including of CO, NO2, O3, SO2, PM10 were  taken  from  the  environmental  protection  agency  Tehran  and  Air  Quality  Control  Company and Archived documents of Disease data were acquired from Iran University of Medical Sciences .Then, descriptive studies were performed on criteria air pollutants and dependent variable . Finally, inferential tests such as Pearson correlation coefficient and linear regression were used to determine the relationship between air pollution and the incidence rate of Lung and Hematologic Neoplasms.

Results showed there was significant relationship between PM10/O3 and among men and women. The correlation of coefficients between PM10 and O3 with Number of cases of disease in men  and women were 0.904, 0.882, 0.924, 0.931, 0.856, 0.949, 0.976, 0.860 respectively.

According to the results, there were positive relationship between PM10/O3 and incidence rate of Lung and Hematologic Neoplasms among men and women. Due to the high level of ozone and airborne particles and their health consequences, Continuous and further prevention and control measures should be developed to alleviate the situation of the two air pollutants.

Surface and groundwater are important vital resources around the world. This study examines the quality of surface and groundwater resources in the catchment area of Latian Dam during the years 1396 to 1398 using GIS tools and water quality indices.
materials and ways  In order to evaluate the quality of water resources, samples were taken from 10 selected stations in two rainy and low rainfall seasons during three years and the physical, chemical and microbial parameters of the samples were evaluated. Then, using water quality indicators and hydrogeochemical characteristics, the quality of water resources was determined and the zoning map of the indicators was prepared using ArcGIS software. The resulting hydrogeochemical data were also interpreted using Piper, Schuler, Wilcox graphical diagrams and statistical analysis.

The results show that on average, during the rainy seasons, the whole region had good quality (30.644). For surface water stations, 3 stations in high rainfall season were of excellent quality (44.243), 2 stations in low rainy season were of excellent quality (40.145) and other stations were of good quality (69.92). According to the piper diagram, the samples are in two states Ca-Mg-SO4-Cl and Ca-Mg-HCO3 and the results of the study of cation and anion combination are mainly Ca-Mg-HCO3. Correlation coefficient between the main variables, there was a significant relationship between IRWQIGC groundwater and its GWQI (r = 0.87) and between IRWQISC surface water and its WQI (r = 0.68) but there is no significant relationship between groundwater and surface water quality. The average groundwater quality during the study period was good (29.143).

With the increase in recent droughts and shortage of drinking water resources led to planning to desalinate water and set up mobile stations. The purpose of this study is to determine the microbial and physicochemical quality of water discharged from desalination plants and tankers in Qom.

This descriptive cross-sectional study was conducted for one year with monthly sampling of water from domestic water purifiers and mobile tankers. Samples were analyzed for microbial contamination and physicochemical quality (pH, TDS, turbidity and chlorination) according to standard methods. The data were analyzed using SPSS and Excel software and compared with the standards.

Positive values of fecal coliform contamination was 13.34% in tankers and 4.35% in domestic water purifiers. The pH, TDS, turbidity was in accordance with the national and WHO standards. T-TEST statistical analysis showed, microbial quality of water had a significant relation with variables of dewatering containers (P<0.021), tank washing (P<0.001), outlet valve contamination (P<0.011), contact with dust (P<0.014), the personal health of the distributor (P<0.026), temperature (P<0.033), water retention time (P<0.019) and environmental sanitation (P<0.003). ). . But there was no significant difference in the distribution of water between tankers and desalination plants (P < 0.068).

By preventing secondary pollution, the water quality of these places can be considered desirable. Therefore, periodic and regular water evaluation and training on maintenance and health issues should always be considered

Various challenges of aboveground waste bins including the overflow caused by the few numbers of reservoirs, visual pollution, incompatibility of the bins with the urban furniture, vulnerability of the bins to corrosion and fire, and the residents’ dissatisfaction led to creation of underground collection systems. This study aimed to determine the technical requirements and the implementation costs of underground systems for the collection of household wastes in Karaj.

The present research is a descriptive-analytical study investigating the waste collection systems of Karaj for six months. The research goal is to analyze and compare the current aboveground waste collection system of Chahrbandi Boulevard in Mehrshahr (Karaj) with the underground collection system in terms of the technical and economic aspects. The research stages include the following: referring to the urban service department of Karaj municipality to get the information of the bins located in Chahrbandi Boulevard, designing the underground waste collection system for Chahrbandi Boulevard, estimating the operational costs of the underground waste collection system, and comparing the current (aboveground) system with the underground system in terms of technical aspects.

According to the results, in the aboveground waste collection system, the total costs of the initial investment are equal to 1772298000 Tomans, and the total costs of the ten-year operation period are equal to 5156406506 Tomans. In the underground waste collection system, the total costs of the initial investment are equal to 1267236800 Tomans, and the total costs of the ten-year operation period are equal to 4095305226 Tomans.

The cost analysis suggests that both the initial investment cost and the ten-year operation cost of the underground waste collection system are lower than those of the aboveground system. Therefore, it is recommended to change the solid wastes collection system of Karaj city to underground one.

Legionella Pneumophila bacteria is known as one of the most important nosocomial infections and the most common cause of death in patients. This study was aimed to identify Legionella Pneumophila bacteria in hospital water supply systems.

This descriptive cross-sectional study was performed to identify Legionella pneumophila in hot and cold-water systems of important and sensitive wards of Imam Khomeini Hospital in Divandareh city (neonatal, dialysis, obstetric, gynecological and menchr('39')s surgery). A total of 60 samples were collected from these sections.

According to the results of this study, a total of 17 (28%) of all samples were infected by Legionella pneumophila bacteria in water supply systems including hot showers and cold water in neonatal, dialysis, delivery, surgery. gynecology and menchr('39')s surgery wards were identified.

Lack of proper water treatment system, low residual chlorine content, and presence of biofilm in water supply system and proper temperature range of growth with this bacterium could be the major causes of Legionella contamination in the studied hospital.

Water supply systems and various parts of dentistry unit have the ability to aggregate biofilms and thus the transmission of dangerous diseases to staff and patients. The aim of this study was to determine the bacterial contamination of surfaces and water lines of dental units of health center (Qods 2) in Divandareh city.

This cross-sectional descriptive study was conducted on dental units of the health center (Qods 2) in Divandareh city in 2019. 125 samples were collected from different parts of the units including unit lamp handle, lamp ON/OFF power button, open/close bolt of unit water, setting switch button (before and after disinfecting), and the inlet and outlet water of units. The samples were tested for Staphylococcus aureus, Pseudomonas aeruginosa, Coliforms and Escherichia coli.

The results of this study showed that all samples collected from the studied parts of the units including unit lamp handle, lamp ON/OFF power button, open/close bolt of unit water, and setting switch button were positive as presence of Staphylococcus aureus, Pseudomonas aeruginosa, and coliforms before and after disinfection. Also, the unit lamp handle and setting switch button were positive as Escherichia coli. The inlet and outlet water were also positive for all the studied bacteria. The number of Staphylococcus aureus bacteria in the handle of the unit lamp before disinfection (210±80.5 CFU/ml) and in the ON/OFF button of the lamp after disinfection (300±82.6 CFU/ml) were higher than the permissible amount (200 CFU/ml). Also, the number of Pseudomonas aeruginosa bacteria detected in setting switch button, before disinfection, was higher (200±75.2) than the allowable value.

According to the obtained results, the contamination level of water and surface of the studied dental units was high. Also, identifying of the considerable number of bacteria at the different surfaces of the units, indicating the improper use of the disinfectants and the possibility of biofilms presence in the unit waterlines.

Construction is one of the most dangerous industries in the world and one of the authorities’ concerns of officials in this area is to improve their safety. This study was carried out so as to investigate the causes of unsafe behaviors in a combined cycle power plant.

In this cross-sectional study, a questionnaire for 300 workers of the combined cycle power plan were used. The obtained information was divided into criteria and sub-criteria affecting the causes of unsafe behaviors. Criteria and sub-criteria were distributed as a pairwise comparison questionnaire among 19 people who worked on the safety and they were supposed to answer based on their experiences as well as the distance scale. Criteria and sub-criteria were ordered by Analytic Hierarchy Process (AHP) and using Expert Choice software.

the results showed that the criterion of individual characteristics (34 %) is the most effective factor for unsafe behaviors and followed by employer (22%), teaching 915%), education (12%), specialization and experience (7.8%), age (7.6%), job characteristics (3%), and weather condition (2%) respectively.

the most important sub-criterion of individual characteristics is a onechr('39')s susceptibility to accident. Hence, it is necessary to prevent unsafe behaviors by employing vulnerable people in less dangerous occupations.

The presence of nitrate and phosphate in concentrations above the allowable level in surface and groundwater resources leads to disease and problems. The aim of this study was to investigate the adsorption efficiency of magnetic-metallic chitosan nanocomposite in the adsorption of nitrate and phosphate from aqueous solutions.

The adsorbent was synthesized by co-precipitation method. Different concentrations of nitrate (50-300 mg/L) and phosphate (100-400 mg/L) were prepared and their removal was evaluated by different concentrations of synthesized adsorbent (0.1-0.5 g/L). Various parameters such as temperature (20-40 ° C), pH (5-8), contact time (0-90 minutes) and the presence of interfering ions (chloride, phosphate, hardness 1.5 mM) were investigated. SEM, XRD, FTIR and XRF tests were used to determine the synthesized adsorbent characteristics.

Magnetic-metallic chitosan nanocomposite adsorbent is able to effectively remove nitrate and phosphate from aqueous solutions. Nitrate and phosphate removal efficiencies under conditions of  pH=5, nitrate concentration (100 mg/L), phosphate concentration (200 mg/L), 60 min contact time and 0.3 g/L adsorbent concentration were 87.2% and 74.9%, respectively. The adsorption process of both pollutants followed the langmuir model and pseudo second kinetic order. Interfering ions reduced the removal efficiency of contaminants by 73.1% for nitrate and 65.9% for phosphate.

Since the presence of nitrate and phosphate anions, as common contaminants and indicators of water resources, the use of magnetic-metallic chitosan nanocomposite adsorbent is very effective in the removal of these contaminants.

Due to their antibacterial effects, herbal remedies have an important role in the treatment of infections; particularly in infected wounds. Increased bacterial resistance to antibiotics combined with increased side effects related to their administration has led many researchers to investigate alternative herbal treatments in recent years. In line with this trend, the objective of this study was to assess the antimicrobial effects of Dr Kamkar’s cream on different microbial strains in vitro.

The susceptibility of isolates to the cream was evaluated using well diffusion, the Minimal Inhibitory Concentration (MIC) and Minimal Bactericidal Concentration (MBC) methods. 11 microorganisms were analyzed which included 5 strains routinely used to assess antibacterial effects and 6 clinical isolates were obtained from patients’ wounds. Based on CLSI (2018) standards, the Kirby& Bauer method was utilized to investigate the sensitivity of the strains to commonly used antibiotics.

The herbal cream was effective against 10 strains, while only 1 strain demonstrated resistance. Bacillus subtilis was the most susceptible bacteria to the cream with a zone of Inhibition of 31mm, followed by Bacillus anthracis (25mm), Staphylococcus aureus (22mm), Acinetobacter baumannii (22mm), Staphylococcus epidermidis (20mm), Bacillus cereus (16mm), Pseudomonas aeruginosa and Methicillin-resistant Staphylococcus aureus (14mm), Streptococcus pyogenes and Candida albicans (20mm) and resistant to Escherichia coli.
MIC findings indicated that the herbal cream had maximal effect against Bacillus cereus, and minimal efficiency against Streptococcus pyogenes and Candida albicans, while MBC results showed maximal effect against Bacillus cereus and minimal effect against Pseudomonas aeruginosa.
 Results of antibiograms revealed resistance to several antibiotics.

According to the results, Dr Kamkar’s herbal cream has suitable antimicrobial activity against certain pathogenic microorganisms and can be used alone or in combination with Antibiotics in the treatment of infected wounds.

Aerobic granules as a novel type of bio-sorbent have an excellent settling ability and high-porosity structure. This study investigated the feasibility of aerobic granules for chromium (VI) removal from synthetic aqueous solution and compare it with conventional activated sludge.

In this research the effect of some important parameters including pH (5, 7, and 9), initial chromium (VI) concentration (25, 50, and 100 mg/l), and equilibration time (30, 60, 120, 180, 240, and 360 minutes) in removal of chromium (VI) from synthetic aqueous solution in batch system have been studied. The amount of chromium (VI) was determined using Spectrophotometer at 540 nm.

The results indicated that at pH=5, initial chromium concentration of 25 mg/L  and equilibration time of 120 minutes, 97.65 % of chromium (VI) was found by aerobic granules. In the second stage, chromium (VI) removal was examined using conventional activated sludge which the efficiency of chromium (VI) were obtained 58% in the optimum conditions (pH=5, initial chromium (VI) concentration =25 mg/l, and retention time=120 minutes).

Totally, it can be concluded that aerobic granules sludge as an effective and low-cost biodegradable adsorbent has a good performance for the removal of chromium (VI) from aqueous solutions.

The aim of this study was to evaluate the microbial quality of drinking water in Karaj, Iran in terms of heterotrophic bacteria count index (HPC) and its variation trend using geographic information system (GIS) in 2016.

In this study, water sampling was carried out in Karaj distribution network in all 12 regions and based on this, 3 samples were taken from each region by grab sampling technique.

The findings indicated that the mean terms of free residual chlorine, turbidity, and pH in the 12 regions of Karaj were respectively measured 0.2-0.8 mg/l, 0.22-0.94 NTU, and 7.3-7.8. The highest levels of HPC in regions of 3, 6 and 9 of Karaj were detected at 70, 115 and 320 colonies, respectively. The highest turbidity rates were 2.48 and 1.62 NTU in regions 3 and 9, respectively, and the lowest rate was 0.22 NTU in region 5.

According to results, in all samples, the obtained HPC levels were within the recommended national standards. Furthermore, the results of water quality zoning using ordinary point kriging represent high quality drinking water and its complete overlap in the studied cases.

Pressure ulcers are among the most serious skin and tissue disorders and put a heavy financial burden on healthcare systems. These ulcers break through the body’s first line of defense and can lead to severe consequences such as septicemia and death. Nowadays, most conventional treatments are very costly; therefore, the production of less expensive medications including herbal remedies is crucial. This study aimed to determine the healing effect of Dr Kamkar’s herbal cream in one to third stage Pressure Ulcer.

This single-blind randomized clinical trial was conducted on 65 patients aged 40-80 years with stage1- 3 Pressure ulcers at Imam Ali Hospital in Karaj.
The control group was treated with zinc oxide cream, while the intervention group was treated with Dr Kamkar’s herbal cream. Ulcers were measured according to the Pressure Ulcer Scale (PUSH) at the beginning of hospitalization and weekly for 8 weeks and the PUSH scores in the two groups were compered. Data analysis was carried out using SPSS version 23.

The results showed that in the intervention group the slop of decline in the PUSH score was greater in comparison to the control group. Regarding the area of the lesions, exudation and tissue regeneration, the levels of improvement in the intervention and control groups were 85% and 18%, respectively.

According to our data, a significant difference in the mean scores of the pressure ulcer was observed between the two groups (P ≤ 0.0001). It can be concluded that Dr Kamkar,s healing cream is effective in the treatment of stage one to third pressure ulcers.

Aniline is a substance used in chemical industries and in various processes such as pesticide production, chemical bleaching, textile dyes, etc. In spite of the negative effects of aniline on the environment due the difficult decomposition of this substance, various methods have been investigated to remove this substance from water resources. The aim of this study was to investigate the efficiency of magnetized carbon nanotubes in the removal of aniline from aqueous solutions.

Fe3O4-CNT magnetic nanoparticles were prepared by co-precipitation method. The morphology of the adsorbent surface, shape and size of CNT-Fe3O4 magnetic nanoparticles was investigated by scanning electron microscopy (SEM) and transfer electron microscopy (TEM). BET analysis was also used to determine the physical properties of the adsorbent such as surface area, size and volume of the cavities and their distribution on the adsorbent. An X-ray diffraction device (XRD) was used to determine the pattern and the purity of the Fe3O4 particles. The synthetic adsorbent properties were analyzed by FTIR technique. In order to optimize the adsorption conditions and determine the optimal values of each of the factors affecting the adsorption process (pH, contact time, adsorbent value, initial aniline error and temperature), adsorption experiments were performed and aniline concentration was determined by spectrophotometric method.

SEM and TEM analyzes showed that the magnetic carbon nanotubes were almost uniform and had an average diameter of 5 nanometers and an average length of 100 nanometers. XRD analysis also showed the stabilization of Fe3O4 on carbon nanotubes. FTIR analysis for the absorption of aniline contaminants on the magnetic carbon nanotubes adsorbent indicated that the aniline contaminant bond has appeared on the adsorbent.

The results of the study showed that magnetic MWCNT adsorbent was able to effectively remove aniline contaminants from aquatic environments. Statistical analysis showed that pH parameters, adsorption concentration, pollutant concentration, temperature and contact time were effective on pollutant removal efficiency.

Magnesium oxide is one of the alkaline earth metal oxides which due to its catalytic properties has been widely used in the analysis of hazardous chemicals. The main purpose of this study was to remove tetracycline antibiotics using magnesium nano oxide.

In this study, magnesium oxide nanoparticles were synthesized in the presence of cetyl trimethyl ammonium bromide. Synthesized nanoparticles were analyzed by X-ray diffraction (XRD), thermal analysis (TGA), transmission microscopic analysis (TEM), particle size distribution analysis (DLS), infrared radiation analysis (FTIR) and electron diffraction (FES) electron microscopy (FES). In the next step, the efficiency of the synthesized nanoparticles in the batch system was investigated by changing one parameter and keeping the other parameters constant in removal of the tetracycline antibiotic.

Increasing the pH from 3 to 7 caused efficiency increase, but decreased again to pH = 11. As the contact time increases, the efficiency increases. This increase was steepest for 60 minutes and is almost constant after 60 minutes. According to other available concentrations,the contact time of  60 minutes was chosen as the optimum time. The efficiency without the presence of interfering ions in optimum condition was 81.68%. By adding the interfering ions the efficiency at the lowest concentration level of the interferers was 62.29% (nitrate), 40.11% (sulfate), 55.32% (Cu) and 43.56% (fluoride) decreased. The highest reduction was obtained with sulfate ion at 300 ppm which showed an efficiency of 15%.

The results of this study showed that MgO adsorbent can efficiently remove tetracycline contaminants from water resources.

Water interfering anions can cause major problems in the quality of drinking water as well as entering water to the industry. The purpose of this study was to determine the efficacy of granulated metallic-magnetic chitosan nanocomposite for adsorption of interfering anions in aqueous solutions (sulfate, chloride, carbonate and bicarbonate.

Synthesis of granulated metallic-magnetic chitosan nanocomposite was conducted based on co-precipitation method. The anions chloride (300-50 mg / L), carbonate (150-50 mg / L), bicarbonate (50- 150 mg / L) and sulfate (50-300 mg / L) were considered. The pH range of the study was between 5- 8 and the remaining time was 0-90 minutes. For the study of the adsorption process, the Langmuir and Freundlich isotherms were considered as pseudo-first and pseudo-second kinetics order at temperatures in the range of 20-45 Celsius.

The results showed that the best removal efficiency of anions was obtained at pH = 5. With an increase in chlorine concentration from 50 mg / L to 300 mg / L, the removal efficiency decreased from 80.06% to 38.22%. This trend has also been observed for other anions in the study, which decreased from 57.82% to 37.69% for sulfate at similar concentrations. In carbonate and bicarbonate, at 50-50 mg / L concentrations, the removal efficiency decreased from 61.15% to 41.17% and 79.66%, respectively, to 49.36%. The percentage of removal of chlorine ion with an amount of adsorbent between 1-5 g / L increased from 62% to 91%. However, increasing the amount of absorbent after 4 g / L did not have a significant difference in removal of chlorine. The same effect was observed for other anions in the study, so that the removal efficiency of carbonate, bicarbonate and sulfate anions in exchange for an increase in the absorbent dose increased from 1 g / L to g / L 5, which was 56% to 93%, 52% to 96% and 53% to 80%. The results of the study showed that the adsorption process follows Langmuir isotherm model and the adsorption of anions is superficial. The absorption model also follows the pseudo-second order kinetic model. In addition, as the temperature rises, the removal efficiency decreases.

The results of the study showed that granulated metallic-magnetic chitosan nanocomposite adsorbent was able to remove the interfering anions from water resources.

Antibiotics are considered due to health and environmental problems and therefore they counted as a major threat to human health. The aim of this study was to determine the absorption efficiency of magnetic-chitosan nanocomposite in the removal of antibiotic tetracycline from aqueous solutions.

In this study, the experiments were performed by spectrophotometer. The magnetic-chitosan nanocomposite were considered as an antibiotic adsorbent which its adsorption efficiency was measured by changing the variables such as temperature, time, PH, dosage of magnetic-chitosan nanocomposite, concentration of tetracycline, concentration of interactive ions of chlorine, sulfate and carbonate. Synthesis of magnetic-chitosan nanocomposite was based on co-precipitation method. The Freundlich, Langmuir and Temkin isotherms were used to determine the isotherm and the absorption kinetics.

The results showed that the best antibiotic removal efficiency was obtained at pH = 6. The highest removal efficiency was obtained at 90 minutes and equal to 91.23%. Moreover, the removal efficiency of tetracycline was significantly reduced in alkaline pH. Also, by increasing the absorbent dose from 0.1 g/L to 0.5 g/L, the removal efficiency of the pollutant increased from 72.24% to 90.22% at 90 minutes. In addition, with an increase in pollutant concentration between 5-30 mg/L, the removal efficiency of the pollutant decreased from 93.4% to 53.7%. In order to study the thermodynamics of the tetracycline pollutant absorption process by magnetic-chitosan nanocomposite, the removal efficiency of the pollutant dropped from 91.23% to 45.1% at 20, 30 and 45 degrees of Celsius. The presence of interfering ions has a decreasing effect on the removal efficiency of tetracycline, which the removal efficiency were reduced from 91.23% at 90 minutes (in the absence of ions) to 70.16% (for chlorine ion), 65.96% (for ion Carbonate) and 54.2% (for sulfate ions).
               

Finally, the use of magnetic- chitosan nanocomposite adsorbent is recommended in the removal of antibiotic tetracycline.

 

Aluminium phosphide (ALP) is a highly effective insecticide and rodenticide used frequently to protect stored grain. Acute poisoning with this compound is common in some countries including India and Iran, and is a serious health problem. The objective of this study was to survey ALP poisoning and the outcome in hospitals in Karaj, Iran.

The study was a retrospective study from April 2006 to April 2011. Records of all patients admitted and hospitalized to hospital during the five-year period were collected. Information including gender, age, amount of ALP consumed, route of exposure and outcome were extracted from the patients notes.

During the five-year period, 67 patients, 53.7% men and 46.3% women were admitted with ALP poisoning. Most poisoned people were under the age of 21 years.The most common signs and symptoms at admission were nausea (79.4%), vomiting (76.5%), abdominal pain (31.4%) and metabolic acidosis (41.1%). Suicidal intention was the most common cause of poisoning leading to 44.8% deaths and most cases were male (P<0/05).

Due to high mortality, follow poisoning with ALP best treatment is prevention. It should be noted that although in previous years, hospitals did not record all cases of poisoning cases but data indicate a high consumption of this poisoning as a suicidal factor in Karaj city. Withdrawal of ALP tablet from the market and the monitoring of their performance can reduce the rate of poisoning in society

In recent years, has been created many concerns about the entry of antibiotics in aquatic environments. The aim of this study is to Investigation of The effect common ions in water sources to remove cephalexin using absorbent mineral pumice (pumice).
This study was Foundation – Applied. In the first stage, absorbent properties were determined using techniques (XRD, BET, XRF, FTIR and SEM) before and after absorption And then, in the second stage, Performance of pumice by changing variables such as time, PH, concentration of pumice, concentrations of cephalexin, different concentrations of calcium, magnesium, copper, sulphate, and carbonate were studied.
The results showed that pumice has a high efficiency in the absorption of cephalexin from aqueous solutions. For cephalexin, maximum efficiency in the contact time of 150 minutes, PH = 5, adsorbent dose of 5 g/l, concentrations of antibiotics 10 mg/l was observed respectively 44.75% (using raw pumice) and 55.66% (using modified pumice).
According to the results obtained with increasing adsorbent dosage and the contact time efficiency increased. When PH and concentrations of cephalexin are increased efficiency is reduced. In this study, the modified pumice with hydrochloric acid in comparison with raw pumice has better efficiency in the absorption of cephalexin. According to the results of this study ions had little effect on the absorption of cephalexin. In this study, adsorption Cephalexin on to pumice follow of Frondlykh isotherm and pseudo-second order.

Phosphorus is a common ion in wastewater treatment effluents, but excess amount of phosphate concentration in the effluent discharge accelerates eutrophication that affects many natural water bodies. Eutrophication of the water bodies is one of the most important environmental problems. Eutrophication can lead to abundant development of aquatic plants, growth of algae and disturbance to the balance of organisms present in the water. Therefore, in present work, natural and modified yellow and red soil with EDTA was used for removal of phosphorous from aqueous solution.
All experiments were conducted in a batch system. Natural yellow and red soil and its modified one with EDTA were used as adsorbent for removal of phosphorous from aqueous solutions. Effect of various experimental parameters such as pH, initial phosphorus concentration, contact time and adsorbent mass were investigated.
Results showed that the removal efficiency was increased by increasing in contact time, adsorbent mass and initial phosphorus concentration. Higher removal efficiency was observed at 150 min contact time, 10 g/L adsorbent mass, 50 mg/L phosphorus concentration and pH 5. At these conditions, about 65% of phosphorus were removed by natural soils, while 78% was removed by modified adsorbents.
The results of present work well demonstrate that, due to higher content of calcium, red and yellow soil is capable for adsorption of phosphorus and if they be modified with EDTA, their efficiency will be improved remarkably.

Swimming is great exercise and entertainment and enjoyment for people of all ages, especially in the hot season. Due to health issues and ways to ensure the health and welfare of people, swimming pools are very important. Therefore, in this study, relationship between the capacity and area of the pool with microbial contamination and heterotrophs were investigated.
This study, based on applied research and analytical - descriptive, correlational, cross-sectional survey was conducted. In this project, we studied 35 swimming pools in the city of Karaj. For this purpose, samples were collected every month for 9 months, turbidity, pH, free residual chlorine was measured at the sampling time and testing for total coliform, E.coli coliform and counting of hetrotrophic organisms in the laboratory of water and wastewater was performed. Data was analyzed by using SPSS software and peyerson analytical.
Frome the 315 coliform samples about 90.2% was pure. Of the 315 tested HPCs, 99.7 percent was found in the clean range. The minimum HPC reported is zero, at most 250 with an average of 18/11 and a standard deviation of 266.68. Peyerson correlation test between heterotrophic bacteria with water turbidity and area to swimmer also has a significant relationship. In this study, there was no significant relationship between swimming pool pollution with pool area.
According to the results, observance of the sanitary regulations of the pool and technical issues can be effective in reducing microbial and heterotrophs contamination.

Phosphate is known to be the main limiting elements in the reuse of wastewater effluents and then it is the key element to outbreak of eutrophication. Therefore the objective of this work was to investigate the adsorption of phosphorous by natural and surface modified pumice with H2O2.
The present work was a fundamental-practical study which done in batch system. In this work, natural and modified pumice were used for removal of phosphorous from aqueous solution. Several experimental parameters including pH (2-10), adsorbent mass (2-10 g/L), initial phosphorous concentration (5-20 mg/L), ionic strength and contact time were studied. All experiments were conducted in batch system with varying one experimental parameter, while others were constant.
The results show that modification of pumice with H2O2 will improve adsorbent sorption capacity without any structural distortion. In addition, higher removal efficiency was observed at 10 g/L of adsorbent dose, pH 6, 130 min contact time and 20 mg/L of phosphorus concentration. In the optimal conditions, 69% and 97% of phosphorus removal were achieved by natural and modified pumice adsorbents, respectively. In addition, removal efficiency decreased for increasing ionic strength. Pseudo second order kinetic model best describe adsorption of phosphorus onto used adsorbent.
The results of present work well demonstrate that pumice have substantial adsorption capacity for phosphorus and in the case of its modification, its adsorption capacity will be improved.

Population growth and limited access to fresh water and need to use bottled water for drinking, chemical and biological quality of the water exacerbates the need for review. The aim of this study was to evaluate chemical and microbial quality in multi-brand bottled water was consumed in the country.
A descriptive cross-sectional study carried out in stages, the first brand of bottled water available 6 recognized and sampling was conducted. The chemical and bacteriological quality of water parameters include cL-, nitrate,Mg, Ca, hardness, Na,No2-, pH , TDS, EC, F-, total coliforms and fecal coliforms in the samples were tested. The average value of each property, with standard and were compared with the amounts listed on the label. Data analysis using the software SPSS, descriptive statistics and analysis of variance (p The results showed that the number of total coliform and fecal coliform bacteria group does not exist in any of the samples and MPN /100cc, respectively. The average concentration of chemical parameters such as pH, TDS, calcium, nitrate and nitrite in all bottled waters, were on the standard ranges. As well as in a number of instances, significant differences between the measured values ​​with the values ​​printed on the label of bottled water there.
According to the results obtained, chemical and biological quality of bottled water is examined in terms of acceptable drinking water standards.

In Iran, due to vast development of different chemical and petrochemical industries and water resource pollution to refractory organic matters, using a costeffective method for the removal of those pollutant from drinking water. The aim of this study was to evaluate the performance of magnetic-multiwalled carbon nanotube for the removal of 2,4- dinitrophenol from aquoeous solutions and deteremining toxicity reduction of the effluent.
Adsorption experiments were conducted in a batch system. Magnetic-multiwalled carbon nanotubes were synthesized by co-precipitation method. Variables of contact time (0-90 min), pH (3,5, 7, 9, 11), pollutant concentration (10-100 mg/L) and adsorbent concentration (1-2.5 g/L) were considered. For the determination of toxicity reduction of the effluent, the Bioassay tests were applied by using Daphnia magna which toxicity of 48h and 96 h were obtained.
Results were showed that the maximum removal of 92.97% in the contact time of 90 min were obtained in pH=7, pollutant concentration of 10 mg/L and adsorption concentration of 2.5 g/L. The adsorption process was in accordance with Freundlich isotherm which showed non-uniform and multi-layered adsorption on the surface of the adsorbent and heterogeneous adsorption. The results of the toxicity of 2,4-DNP, before the adsorption process, on the Daphnia magna organism showed that the lethal concentration (LC50) 48h and 96 h of the raw wastewater was 42 and 38 percent (4.2 and 3.8 mg/L), respectively.
The magnetic-multiwalled carbon nanotube adsorbent could be a proper choice for removal of 2,4-DNP, due to high removal efficiency, recyclability, reusability and activity in neutral pH.

Estrogen is a steroid hormone that is in the water and cause risks for aquatic organisms, especially fish is. Estrogenic hormones naturally (caused by endocrine) or artificial (due to hormonal contraceptives such as birth control pills) to sewage and hospital to find. This study aimed to determine the amount of estrogen in the sewage and Golestan and Abuzar hospital in Ahvaz were studied.
Material and Sampling was done by tracking estrogen in the aquatic environment. 56 samples 4 months in different parts of the Golestan and Abuzar hospital wastewater treatment plant in Ahvaz were taken. Sample a little electro luminescence (ECL) were analyzed by laboratory Iranian city of Ahvaz. In this study, different forms of estrogen (estrone, 17-beta-estradiol, estriol, 17-alpha-ethinyl estradiol) has been studied as estrogen.
Mean hormone found in raw wastewater to the Golestan hospital wastewater treatment plant effluent from the treatment plant hormone 69.08 ng/l and 7.28 ng/l mean. Mean testosterone in Ahvaz Abuzar hospital treatment input 70.61 ng/l and 18.94 ng/l is refinery output. According to the results of high impact biological treatment is the removal of estrogenic compounds.
Secondary treatment of sewage is effective in reducing hormones that can do this at this stage of the biological treatment effect.