Chemical enhanced phosphorus removal from the effluent of micro-aerobic EGSB system
Chemical precipitation with alum was employed as the post-treatment of a micro-aerobic EGSB system treating domestic wastewater to reduce TP concentration. Effectiveness evaluation focused on the influences of reaction/settling time, pH, coagulant dosage and temperature when original TP ranged in 2-8mg/L. It was found that 20min was appropriate for flocculation or sedimentation. Samples with original pH ranged in 6.5-8 had better phosphorus removal. To obtain high efficiency, it was suggested that the pH after precipitator addition ranged in 6-7 was more important than its initial value. In addition, Proper dosage of coagulant increased with the temperature drop. The mole ratio of Al3+:P about 1.9 could ensure residual TP below 0.5mg/L at above 10 ℃, however, the ratio may increase as temperature dropped below 5℃. The beaker test shows that chemical precipitation was a reliable supplement of microaerobic EGSB system.
chemical phosphorus removal micro-aerobic EGSB domestic wastewater pH aluminum dosage temperature
Dong Chunjuan Liu Xiao Lv Bingnan Chen Suyun
Department of Environmental Engineering Taiyuan University Taiyuan 030009,China School of Municipal School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin,150090,China Department of Environmental Engineering Taiyuan University Taiyuan 030009,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）