去除制革废水氨氮的工程实例

成都某制革厂设计水量1 600 m3/d,采用"物化处理 生化处理"的工艺.ABR折板式厌氧池使废水中大量有机氮分解为氨氮,厌氧出水氨氮高达100 mg/L左右.针对这种情况,把SBR曝气池活性污泥的培养分为2个阶段,第1阶段使污泥适应此制革废水,并使其对COD有较高的去除率;第2阶段为培养硝化菌阶段,使自养型的硝化菌逐渐增多,活性加强.在第2阶段注意控制碱度和溶解氧,最终使曝气池中硝化菌在无外加碱度的条件下对氨氮有高的去除率.

One Engineering Example on the Removal of Ammonia-nitrogen From Leather Making Wastewater

The designed water amount for one leather making plant is 1600m~3/d and physicochemical and biochemical treatment processes are applied.ABR anaerobic tank make large amount of organic nitrogen decomposed into ammonia-nitrogen and the discharge amount reaches about 100mg/L.According to this situation,the cultivation of activated sludge in SBR aeration tank is classified into two stages: the first stage,making sludge adapt to leather making wastewater and making it have high removal rate to COD;the second stage is the stage cultivating nitrobacteria,making self cultivating bacteria becoming more and more activated.In the second stage,alkalinity and dissolved oxygen should be controlled and finally high removal rate can be obtained under the conditions of no adding alkalinity of nitrobacteria in aeration tank.