Study on the Treatment of High Ammonia Nitrogen Wastewater with Inner Circulation Impinging Stream Biofilm Reactor

[Objective] The treatment effect of inner circulation impinging stream biofilm reactor(ICISBR) on high ammonia nitrogen(NH+4-N) wastewater was studied.[Method] By means ICISBR,high ammonia nitrogen wastewater was treated by using corncob as biological carrier,and the influence of C/N ratio and dissolved oxygen(DO) on chemical oxygen demand(COD) and removal effect of NH+4-N were discussed in our paper.[Result] With NH+4-N of 200 mg/L,DO of 2 mg/L and C/N ratio of 1.0 or 1.5,the removal effect of COD was mot affected obviously and reached above 92%;the average removal rate of COD and NH+4-N were highest(92.7% and 41.2%) when C/N was 1.5;the average removal rate of COD and NH+4-N decreased obviously to 20% and 10% with the C/N of 2.0;when C/N was 1.5 and NH+4-N reached 200 mg/L,there was no great influence of DO on the removal of COD with great influence on the removal of NH+4-N,namely the removal rate of NH+4-N decreased to 17.1% from 46.4% with the reduction of DO concentration from 4 to 1 mg/L.[Conclusion] Our study could provide theoretical basis for the treatment of high ammonia nitrogen wastewater.