Study of using some microalgae in treatment of domestic wastewater
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Abstract
The present study includes growing five species of microalgae which are Chlorella sacchrophila, Chlorella vulgaris, Scendesmus obliquus, Botryococcus braunii, Chlamydomonas reinhardtii algae and using of biological treatment of domestic wastewater. The present study shows that the studied microalgae has ability to reduce the pollutants average in domestic wastewater for all stations. As the results show that the highest percentage of removal in electrical conductivity (31%) register in case using C. vulgaris, while the lowest percentage (5%) register when using C. sacchrophila. The used algae variant in their ability to reduce Salinity value which reaches the highest percentage of reduce for salinity values (21%) when using C. vulgaris and the lowest percentage of reduce was ( 6%) register when using C. sacchrophila .
The highest percentage of highness of PH (30%)when using C. reinhardtii. The lowest percentage of highest (9.3%) register when using C. sacchrophila. The highest percentage of lowness in alkalinity value (85%) when using C. reinhardtii, whereas lowest percentage lowness was (54%) when using C. sacchrophila and C. vulgaris. The highest removal percentage of calcium and magnesium hardness value register when using B. braunii was (75% and 58%) respectively, while the lowest percentage of removal calcium hardness was (11%) when using C. vulgaris, whereas the lowest percentage of removal magnesium hardness was (37%) when using S. obliquus. The highest lowness percentage in values of total hardness when using B. braunii (66%), while the lowest percentage of lowness was registered in case using C. vulgaris which reaches (26%).
The highest percentage of highness for dissolved oxygen values was (56%) register when using C. reinhardtii, while the lowest percentage of highness was (36%) when using C. vulgaris. BOD values were low which reaches the highest percentage of lowness (43%) when using S. obliquus, while the lowest percentage of lowness (21%) when using C. vulgaris. Nutrients represented by nitrate and phosphors, reach the highest percentage of lowness for nitrate (64%) register when using B. braunii, whereas the lowest percentage was (38%) register when using C. sacchrophila. The lowest removal percentage of Phosphors reaches (32%) when using C. vulgaris whereas the highest removal percentage was registered (64%) in case using S. obliquus.
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