Study on enhanced treatment of sewage from channel discharge with enzyme

This research studied enhanced treatment of sewage from channel discharge with enzyme and the effect of enzyme-biofilm process on the treatment of sewage from channel discharge, and investigated the changes of removal rates of the main pollution indexes at different hydraulic retention time (HRT) to ensure the optimal HRT. Meanwhile, compared the difference between the laboratory developed compounded enzyme and the foreign composite enzyme to provide the basis for the use of enzyme in future. The research results indicated that enzyme had the good promotion effect on the removal of the pollution indexes. With the increase of HRT, the removal rates of COD
Cr
and ammonia nitrogen were on the rise. However, when HRT exceeded 10h, the increases of the removal rates of COD
Cr
and ammonia nitrogen became slow, so the optimal HRT was about 10h. Furthermore, the promoting effect of the compounded enzyme was equivalent to that of the composite enzyme for biofilm process, and the compounded enzyme could come into use instead of the composite enzyme.