بررسی توانایی جذب نیترات و فسفات از پساب استخرهای پرورش ماهیان گرمابی استان خوزستان توسط ریزجلبک Chlorella vulgaris

Due to the potential of sewage to contaminate food and water resources, it is emphasized on the treatment of sewage. One of the most effective biological methods in the treatment of sewage is the use of plants. A group of these plants, which have recently been considered by researchers to treat sewage, are microalgae. Microalgae use sunlight to absorb nutrients from the sewage and make them more useful to biosphere. In this study, the possibility of removal of some pollutant parameters of wastewater was investigated using microalgae Chlorella vulgaris. For this purpose, microalgae was cultured in TMRL medium and the wastewater was prepared from the fish farming pool in Khuzestan province. The growth of microalgae in control and wastewater  treatment was measured every ۴۸ hours, under constant conditions (temperature ۲۷-۲۳ ° C, ۲۰ppt salinity, ۲۵۰۰ lux light intensity) in the period of ۱۵ days. COD, BOD, nitrate, nitrite and phosphate were measured and calculated every ۴۸ hours. The results of statistical analysis showed a significant change in the number of microalgae in the control treatment, so that the highest number of algae was observed on the ۱۱th day but it decreased relative to the ۱۴th day. Also, the results showed a significant difference in the amount of BOD and COD removal was micro-algae culture, with the lowest amount of these two factors observed on the tenth day. The remaining nitrate also received the highest and lowest values on the third and tenth day, respectively. Nitrite was also the highest on the third day and on the ۱۵th day it was the lowest.Phosphate levels also decreased significantly on days ۳, ۵, ۱۰ and ۱۵ compared to the first day (P <۰.۰۵). These results showed the ability of microalgae to reduce wastewater nitrogen and phosphorus and its potential for wastewater treatment. It seems that this microalgae is capable of removing nitrates and phosphates as well as the production of algal biomass in refining systems the effluent of the fish ponds is to be used before entering the natural environment, and the pool effluent can be used as a suitable fertile environment for mass production of this algae.  

Keywords:

کلرلا , BOD , COD , نیترات , فسفات , پساب