BAF联合混凝沉淀处理玉米深加工废水试验研究

Experimental research on the treatment of maize deep processing wastewater by BAF combined with coagulation sedimentation

对玉米深加工废水的二级处理出水进行了BAF＋混凝淀联合工艺处理试验研究，得到最佳试验条件：水力负荷为0．5m^3／（m^2．h），容积负荷为2．37kg／（m^3.d），气水比为2．4：1，水温为20—25℃，滤料层高度为2．0m；PAC投加量为25mg/L，联合PAM投加量为0．5mgL。在最佳条件下，CODQ、TN、TP、SS去除率分别达到7613％、67．8％、90．6％、93．3％，处理出水符合《淀粉工业水污染物排放标准》（GB25461-L2010）的要求。

The experimental research on the treatment of wastewater from maize deep processing by biological aeration filter（BAF） combined with chemical coagulation process has been accomplished. The optimum conditions are as follows ： hydraulic loading is 0.5 m^3/（m^2. h）, volume loading 2.37 kg/（m^3. d）, gas-water ratio 2.4：1, water temperature 20-25 ℃ ,filter media height 2.0 m;PAC dosing quantity 25 mg/L,and combined PAM dosing quantity 0.5 mg/L. Un- der the optimal conditions ,the removing rates of CODcr is 76.3% ,TN removing rate 67.8% ,TP removing rate 90.6% and SS removing rate 93.3%. The treated effluent meets the requirements of the Discharge Standard of Water Pollutants for Starch Industry （GB 2546182010）.