HRT和曝气量对AAO-BAF系统反硝化除磷性能的影响  

Effect of HRT and aeration rate on performance of AAO-BAF system for denitrifying phosphorus removal

作　　者：张为堂[1] 侯锋 刘青松[1] 邵彦青 薛晓飞 彭永臻[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复重点实验室,北京100124 [2]北京北华清创环境科技有限公司,北京100124 [3]北控水务(中国)投资有限公司,北京100124

出　　处：《化工学报》2014年第4期1436-1442,共7页CIESC Journal

基　　金：北京市科技计划项目(D121100000112001);北京市教委科技创新平台项目~~

摘　　要：以COD/TN为4左右的生活污水为处理对象,通过调节系统进水流量和曝气生物滤池(BAF)曝气量,研究了水力停留时间(HRT)和BAF气水比对AAO-BAF反硝化除磷系统运行性能的影响。结果表明,气水比和水力负荷(HLR)对BAF的硝化性能有显著影响,BAF气水比为3:1时,NH+4去除率降低到了72%;当AAO的HRT为4 h,BAF的HLR为3 m3·m-2·h-1时,即使BAF的气水比达到8:1,也不能保证NH+4的完全去除。试验得出,AAO-BAF反硝化除磷系统的PO43-去除率与NH+4去除率存在良好的相关关系,为保证90%以上的磷去除率,NH+4去除率应该达到98%。当AAO的HRT≥6 h,BAF气水比≥4:1时,AAO-BAF系统对COD、NH+4、TN和PO43-的去除率分别可达87%、99%、80%和95%。Integrated anaerobic/anoxic/oxic process with biological aerated filter, AAO-BAF system was used to treat domestic wastewater with low C/N ratio of about 4. By adjusting influent flow rate of the AAO reactor and aeration rate of BAF, the effect of hydraulic retention time （HRT） and aeration rate on the performance of the AAO-BAF system was investigated. The results showed that air/liquid ratio and hydraulic load rate （HLR） of BAF ＋ had great influence on NH4＋ removal. At air/liquid ratio 3：1, NH4 removal rate decreased to 72%. Further, when HRT = 4 h and HLR of BAF was 3 m3 . m-2 . h-1, NH4＋ could not be removed completely even with a high ＋ air/liquid ratio of 8：1. This work confirmed that there was an obvious relationship between PO43- and NH4 removal ＋ efficiencies in the AAO-BAF system. The NH4 removal should reach 98% for over 90% of the PO3- removal. When HRT of the AAO reactor was greater than 6 h, and air/liquid ratio of BAF was greater than 4：1, the average ＋ removal efficiencies of COD, NH4, TN and PO3- could reach 87%, 99%, 80% and 95% respectively.

关 键 词：反硝化除磷 生物技术 曝气 氧化 废水 

分 类 号：X703.1[环境科学与工程—环境工程]