Research on removing selenium from raw water by using Fe/Se co-precipitation system.

The effect of selenium removal from raw water by using Fe/Se co-precipitation system is noticeable. Experiments showed that when the concentration of Se in raw water was 50μgL-1 and the dosage of FeCl3 was between 5-80mgL-1,the system could reach selenium removal of between 83.84%-98.39% and the effluent selenium was between 8.08 - 0.81μgL-1. The effluent concentration of selenium met the Chinese drinking water quality standard for selenium content. Research on factors influencing the Fe/Se co-precipitation system, showed that the optimum dosage of FeCl3 was 5mg L-1, the optimum mixing time was between 5-10 min, the optimum pH was 6.0-8.0, the optimum turbidity of raw water and the optimal temperature had a wide range of application. [ABSTRACT FROM AUTHOR]