Experimental study on treatment of aquaculture water with low ammonia nitrogen content using moving bed biofilm reactor

This article probes into the utilization of moving bed biofilm reactor( MBBR for short) in treating aquaculture wastewater of low ammonia concentrations. It analyzed the concentration changes of influent and effluent ammonia,nitrite and nitrate in artificially simulated low ammonia( 2 mg /L or so) aquaculture wastewater at different hydraulic retention time( HRT) and aeration rate conditions,discussed the effects of HRT and aeration rate on the treating result and compared for verification the situations of the actual sturgeon aquaculture water( ammonia concentration 0. 5- 1. 5 mg /L) with those reported in other literatures. The result shows the optimal HRT is 6- 8min and optimal aeration rate is 180 L /h,corresponding to an ammonia removal rate of 70%- 75%,ammonia removal load of 560- 700 g /( m3·d) and biofilm thickness of 26-38μm,with various membrane surface structures,rich species and good membrane growth,which shows the high efficiency of the reactor in treating low ammonia concentration aquaculture water.