جستجوی مقالات مرتبط با کلیدواژه "bacteria" در نشریات گروه "مهندسی آب"

The textile industry is one of the largest consumers of water and chemicals, so that each kilogram of textile product requires 100-200 liters of water.Therefore, due to the limited water resources available, having the most pollution among industrial activities and the need to comply with wastewater disposal standards in the environment necessitates wastewater treatment. This study was conducted by review-descriptive method using existing studies. In this article, a review of floating treatment wetland and its application in the wastewater treatment of the textile industry, the key factors affecting the treatment and the combined role of plants and bacteria for maximum purification of contaminated water are presented. Plant tissue in water, roots and rhizomes in sediments play a major role in pollutant treatment. Examining the results of the advantages and disadvantages of different methods in wastewater treatment of the textile industry shows that floating wetland technology is an alternative to traditional and expensive wastewater treatment methods. According to the researches, Phragmites australis is widely used in this technology. Phragmites australis, along with Acinetobacter, Pseudomonas and Rhodococcus, can reduce COD by 92%, BOD by 91%, dye by 86% and heavy metals by 87%.

Phenol and phenolic compounds are highly toxic substances that are found as monoaromatic compounds in various industrial effluents from oil refineries, petrochemical plants, (coal) mines, and phenol resin plants. Their discharge into the environment, especially in water resources, causes serious toxicity. Traditionally, physicochemical methods have been used for the removal of phenol and phenolic compounds. Nowadays, bioremediation is known to be the best method for phenol removal from wastewater. The objective of the present study was twofold: isolation and identification of phenol degrading bacteria in the effluent from Golgohar Mine in Sirjan. For this purpose, samples were collected from different sections at Golgohar Mine and its effluent. Phenol degrading bacteria were isolated via enrichment of the samples in the Bushnell Hass medium with phenol used as the only source of carbon and energy. The predominant phenol degrader bacteria were selected by measuring turbidity at 600 nm. The bacteria were subsequently identified by amplification of 16S rRNA with
specific primers and PCR sequencing. In this study, 17 strains of phenol degrader bacteria were isolated in soil and wastewater samples collected from different zones of the mine. Screening methods confirmed that 4 strains exhibit a better capability for phenol degradation as evidenced by their capability to degrade 0.4 g/l of phenol. Molecular identification showed that these bacteria belong to the species Pesudomonas sp, Nitrratireductor sp., and Salegentibacter sp. The results also show that the effluent from Golgohar Mine in Sirjan contains many phenol degrading bacteria. The use of these bacteria in the treatment process may lead to a significant reduction in phenol pollution in the mineral effluent.