多阶段曝气SBR法处理淀粉废水

采用多阶段曝气SBR法处理模拟淀粉废水，研究温度和缺氧曝气时间比对处理效果的影响。结果表明，SBR法在室温下就能高效地处理淀粉废水。多阶段SBR法中的缺氧反应可以促进淀粉水解酸化成小分子有机酸，提高了废水的可生化性，但对COD的去除不明显；曝气反应对COD的去除起主要作用。水解／好氧时间比的设置应由废水性质来决定。对于处理淀粉浓度6．0gm、相应COD值为6690mg／L的废水，“4h搅拌＋8h曝气”组合是最高效的，反应24h，COD去除率高达96．8％，出水COD仅215mg／L；而对于处理淀粉浓度8．0g/L、相应COD值为8920mg／L的废水，“6h搅拌＋12h曝气”组合是最高效的。只需处理30h，COD去除率高达94．4％，出水COD仅547mg／L。

SIMULATED STARCH WASTEWATER TREATMENT BY MULTI-STAGE AERATION SBR PROCESS

A multi-stage aeration SBR process was designed to degrade simulated starch wastewater.Effects of temperature and the ratio of anoxia to aeration aerobic time on the process were studied.It was found that starch wastewater could be efficiently treated at room temperature.The hydrolysis treatment in multi-stage SBR process could accelerate the hydrolysis of starch into small organic acid molecule and improve the feasibility of biochemical treatment of the starch wastewater,but the removal efficiency of COD which was mainly determined by the aerobic treatment was relatively low.The optimal ratio of hydrolytic/aerobic time depended on the properties of wastewater.For the treatment of wastewater containing 6.0g/L starch and 6690 mg/L COD,the combination of 4 h 8 h was optimal,through which the removal efficiency of COD could reach to 96.8 % and the COD concentration of outlet wastewater was only 215 mg/L after treatment for 24h.The combination of 6 h 12 h could be the most efficient to treat the wastewater containing 8.0 g/L starch concentration and 8920 mg/L COD.After treatment for 30h,the removal efficiency of COD was 94.4 % and the COD concentration in outlet wastewater dropped to 547 mg/L.