فهرست نشریات علمی دسترسی آزاد ایران

Todays, industrialization along with the growth of population have increased wastewater production that become one of the serious problems for ecosystems and environment. Conventional wastewater treatments (physical or chemical methods) that consume great deal of energy and cost, are not very effective in removing nutrients like nitrogen and phosphorus so application of biological methods such as using microalgae have been noticed. Wastewater usually contain various compounds such as nitrate and phosphate that can be used as culture medium for microalgae (cyanobacteria). So consumption and elimination of these elements from media not only helps to biological treatment of wastewaters but also cause to higher productivity of these organisms. In this research, screening artificial wastewater elements and their role in physiological activities of the cyanobacterium Fischerella muscicola have been studied. Our specimen isolated from Caspian Sea and identified molecularly according to 16s rRNA. Artificial wastewater treatments were designed by Design-Expert software in 12 runs by adding various amounts of NaCl, CaCl2, MgSO4, NaNO3, K2HPO4 to BG110 medium and microalgae were cultured in them. Analysis of treatments according to the changes of cations (Na+, Ca2+, Mg2+), anions (Cl-, NO3-, PO43-), TDS and COD were performed on logarithmic phase(10th day of the culture). According to the results, screening of wastewater elements were done by parreto plot and normal plot charts. Results showed that among applied elements in wastewater, NaCl, NaNO3 and K2HPO4 have the most effect on growth of Fischerella and changes of cations, anions, TDS and COD. As removing nutrients from media have related to the growth, so wastewater (especially with nitrate and phosphate) could be an appropriate media for microalgal growth and producing various bioactive compounds.