Influence factors in treatment of low temperature and low turbidity water by compound bioflocculant.

The application of compound bioflocculant (CBF) in the treatment of low temperature and low turbidity water was studied in this work. The jar test was adopted to examine the effects of hydrogen ion concentration (pH), the CBF dosage and the cationic flocculant dosage on the removal efficiency of turbidity. Coagulation test shows that CBF has an effective performance with dosage of 5.0 - 17.5 mg/L in alkalescence environment. The optimal conditions for treatment of low temperature and low turbidity water by CBF are the dosage of 7.5 mg/L and pH of 8.0. The cationic flocculant can increase the production of flocs. Based on an overall analysis of removal efficiency and economic sectors, the optimal dosages for treatment of low turbidity water are CBF of 4 mg/L and PAFC of 10 mg/L, then the turbidity removal rate is 73. 0% and the COD_Mn, removal is 60.7%. [ABSTRACT FROM AUTHOR]