فهرست مطالب ali atamaleki

We aimed to conduct a meta-analysis on the concentration of potentially harmful elements (PHEs) in carrots and potatoes irrigated by wastewater and estimate non-carcinogenic health risks among adult and children consumers.

The health risk of PHEs concentration, including Pb, Cd, total Cr, Ni, Zn, Cu, and Fe, in the edible parts of carrot and potato irrigated by wastewater was investigated by a meta-analysis using a random-effects model (REM). Accordingly, the related articles were screened from international databases such as Scopus, Medline, and Embase.

The meta-analysis of 32 papers (38 studies) revealed that the rank order of the most accumulated PHEs in potato was Fe (86.54 mg/kg wet weight) > Zn (30.9 mg/kg wet weight) > Cu (13.7 mg/kg wet weight) > Ni (8.42 mg/kg wet weight) > Pb (5.56 mg/kg wet weight) > Cr (3.45 mg/kg wet weight) > Cd (0.58 mg/kg wet weight). This ranking for carrot was Fe (43.36 mg/kg wet weight) > Zn (36.29 mg/kg wet weight) > Ni (13.49 mg/kg wet weight) > Cu (9.79 mg/kg wet weight) > Pb (1.84 mg/kg wet weight) > Cr (1.05 mg/kg wet weight) > Cd (0.28 mg/kg wet weight). Total hazard quotient (THQ) of PHEs was higher than 1 for potato and carrot; its rank order for potato and carrot was Cu > Pb > Cd > Ni > Fe > Zn > Cr and Cd > Pb > Cu > Ni > Fe > Zn > Cr, respectively. The Cd, Pb, and Cu had also a considerable role for consumer health risk.

According to the results, continuous monitor and control of wastewater treatment plants are necessary.

In the process of steel production by electric arc furnace (EAF), it is found that 10 to 20 kg of dust was emitted per every ton of produced steel. Concerning the pollution potential of emitted dust and its reuse ability, the present study was aimed to determine the chemical composition of the electric arc furnace dust with a reuse perspective. This study was done in a steel factory equipped with EAF. Local exhaust ventilation system is installed on the furnace and equipped with cyclone and venturi scrubber. To analysis of dust compounds were gathered in a cyclone and those left the system, the samples were taken from the cyclone hopper and exhaust fan outlet. Finally, the samples were analyzed by X-ray diffraction (XRD). According to the results, the trapped dust in the cyclone and scrubber were 226.86 and 44.81 kg/hr, respectively. The results obtained from XRD analysis also showed that about 50% of the dust was formed by Fe2O3. The quotient of other compounds such as CaO, MgO, SiO2, and Zn was more than 30%.

the results of this study showed that EAF dust composed of a range of elements with different concentrations. Given the high weight of these compounds, reusing some of these elements can be having a positive impact on health and the economy.

Dissolved air floatation (DAF) is one of the methods has been used for the sludge thickening in wastewater treatment plants. This study aimed to investigate the effects of coagulation and sonication processes as additional configurations on the efficiency of a lab-scale DAF process for thickening of the biological sludge of an industrial wastewater treatment plant in Kashan, Iran.

The required amounts of sludge samples were collected from a wastewater treatment plant and kept at temperature of 4°C. Variables, such as pressure (3, 5, and 7 atm), flotation time (5 and 10 minutes), ultrasonic irradiation power (0, 75, and 150 W), and presence/absence of Fe-based coagulant were considered on a sequencing batch reactor (SBR) included coagulation, flotation, and sonication processes, respectively.

The use of ultrasonic waves led to an insignificant increase in the DAF efficiency (P > 0.05), however, the application of coagulant significantly increased the thickening efficiency (P < 0.05). The maximum efficiency of the process was achieved at flotation time of 5 min, pressure of 3 atm, and sonication power of 75 W.

According to the results, DAF has a proper efficiency for thickening of biological sludge. Coagulation compared to sonication has a greater effect on the efficiency of the process.

Water resource management in order to preserving and supplying of high-quality water, plays an important role on communities health. For this reason, humans have always used different methods to provide high-quality water. One of these methods is the use of Radial Collector wells. In this study, the effect of Radial Collector wells on the microbial and physicochemical quality of Doogh River during 5 years has been investigated.

In this study, we assessed some water quality parameters on Dough River (DR) and its adjacent Radial Collector Well (RCW) which supplies water shortage of Gonbad Kavous city, Golestan province, Iran. For this purpose, monthly samples during 2012 to 2016 were collected from DR and RCW, then parameters included nitrate, phosphate, turbidity, pH, fecal coliform, and temperature were measured. Finally, effect of time variation and infiltration of water from DR to RCW on qualitative parameters was analyzed.

According to the results, nitrate, phosphate, turbidity, pH, and fecal coliforms significantly decreased during infiltration process (P-Value <0.05). In addition, the time variation of nitrate, phosphate, turbidity, temperature, and fecal coliforms had significant difference.

The present dataset demonstrated that RCW has a good efficiency for reduction of measured parameters. Also, monthly variations can be effective on water quality of resources.

One of the most harmful agents in hospital settings is ionizing radiation such as X-rays that physicians and other staff expose in surgeries and diagnostic tests. Therefore, the aim of this study was to measure X-ray dose in the diagnostic radiology units of hospitals affiliated to North Khorasan University of Medical Sciences. This is a descriptive-analytical, cross-sectional study, in which all of the hospitals' diagnostic radiology units including CT scan, mammography, fluoroscopy and radiography were studied. X-ray dose was measured by a dosimeter-radiometer device (MKS-05 Terra-P). The International Radiation Protection Association (IAEA) checklist was used to check the observance of the Radiation Protection Principles. The results of this study showed that the X-ray doses in the CT scan, mammography, and fluoroscopy units of Bojnord Imam Ali Hospital were 0.16, 0.08 and 0.01 μSv/h, respectively. The doses of X-ray in the radiology units of Imam Ali (PBUH), Imam Reza (PBUH), Esfarayen and Shirvan Hospitals were 0.12, 0.12, 0.11, and 0.11 μSv/h, respectively. According to the results, the X-ray doses in the diagnostic radiology units of hospitals were lower than the standard limit proposed by the International Radiation Protection Association. However, it is proposed to use appropriate protective lead aprons to further protect the exposed staff in the units in question.

Background and Nitrate, nitrite and other physicochemical parameters of the pollutants of groundwater resources which are mainly associated with agricultural and wastewater disposal areas. The aim of this study was to determine these parameters in drinking groundwater resource of Saveh city using Geographic Information System during the year of 2018 and investigation of contaminant’s in the region’s aquifer.
In this descriptive cross - sectional study, data including temperature, Nitrate, Nitrite, pH, TDS, Total hardness, Fluoride, Ammonium, Sulfate, Chloride, and Sodium’s monitoring in Saveh during the year of 2018. Monthly concentrations of these parameters were calculated, and then relationships between pollutants and region’s aquifer analyzed by GIS software version 9.3. Also, the Inverse Distance Wighted (IDW) method was used to estimate the conditions of the whole region.
Findings: The average concentration of chlorine, sulfate, electrical conductivity, total soluble solids, total hardness and sodium exceeds the permissible limits, and the non-qualitative water conditions are quite evident. Also, the amount of two magnesium and sulfate synergist ions that in their 1053 standard should not exceed 250 and 30 mg/l respectively, but unfortunately did not conform to this standard. It should be kept in mind that the high level of these two ions simultaneously can disrupt the harshness. Fluoride and nitrate levels were also acceptable range in all areas.
The highest deviation level from 1053 standard was for total soluble solids, sodium, magnesium, and sulfate. It is better to consider a comprehensive program to solve the problem, including use of nanotechnology, filtering or ion exchange

Aims: Increasing population density in cities has led to an increase in industrial and municipal wastewater sludge generation volume. Dissolved air flotation (DAF) can widely be used for water and wastewater treatment. The aim of our study is to evaluate some DAF design parameters on biological sludge thickening which generated from an industrial wastewater treatment plant.
This experimental research had been carried out as a laboratory-scale study on DAF process to thickening of the biological sludge. The required amount of sludge was taken once from the Amikabir industrial town wastewater treatment plant in Kashan, Iran. After determination of optimal recycling rate, pH, and coagulant dose, effects of pressure (3, 5, and 7 atm), flotation time (5 and 10 min), and coagulant addition were evaluated on DAF process efficiency.
According to this investigation results, the optimal pH and dose of coagulant were obtained 7.5 and 200 mg/L, respectively. Maximum process efficiency for the reduction of total dissolved solids (TDSs), total solids (TSs), and turbidity parameters was 61.01%, 84.02%, and 97%, respectively. Furthermore, the results showed that in contrast to time, coagulant addition and pressure have significant effect on DAF process.
DAF process had suitable thickening efficiency to removal of TDS, TS, and turbidity on biological activated sludge.