Influence of phosphorus on algae growth and sewage purification

Abstract

Abstract: An experiment on the influence of phosphorus in raw sewage on algae growth and sewage purification was carried out in modelling stabilization pond system in laboratory. Results indicate that when TNconcentrations are all kept at 20 mg/Lin raw sewage and TPare changed from 1.25, 2.50, 5.00 to 10.00mg/L, the removal rate of TN, BOD₅ and LASare decreased with increasing TPconcentration, but the removal rate of TPpresents an opposite tendency. The ratio of N/P=20/2.50mg/Lis the better concentration and ratio for sewage purification than others. This result is correlated with the net oxygen production of algae. There are different species composition of algae existed in different N/Psystems. When the ratio of N/Pis changed from 20/1.25, 20/2.5, 20/5 to 20/10 mg/L, the percentage of green algae is decreased with increasing TPconcentration, but blue algae presents an opposite tendency which may cause high levels of algae density, biomass, oxygen consumption, pHvalue and low rate of purification.

Key words: Nitrogen, Phosphorus, Algae growth, Sewage purification

Gao Yurong, Huang Yuyao, Cao Hong, Chen Yanmei . Influence of phosphorus on algae growth and sewage purification[J]. Chinese Journal of Applied Ecology, 1991, 2(4): 355-360.

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