HRT和C/N值对生物膜SND及N_2O产生的影响  

Effects of HRT and C/N Ratio on SND and N_2O Production in Biofilm Reactor

作　　者：张朝升[1] 赵会伟[1] 张可方[1] 荣宏伟[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《中国给水排水》2015年第9期42-46,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51278133;21477027);广东省自然科学基金资助项目(S2013010013943);广东省科技计划项目(2012B030800005);广东省教育厅科技项目(2012KJCX0085)

摘　　要：采用连续流生物膜反应器处理模拟生活污水,考察了HRT(分别为5.0、6.5、8.0、9.5和11.0 h)以及C/N值(分别为2.0、3.5、5.0、6.5、8.0)对同步硝化反硝化(SND)脱氮效果的影响,并探讨其一氧化二氮(N2O)的释放情况。结果表明,当HRT=8.0 h时最有利于实现同步硝化反硝化,且处理效果最佳,对COD和氨氮的去除率均在90%以上,对总氮的去除率为68.2%,同步硝化反硝化率为80.9%。HRT=6.5 h时,N2O释放量最高,此时转化率为3.44%。较高的C/N值有利于N2O的减量化控制,当C/N值=2.0时系统中N2O释放浓度最高。但综合能耗和去除效率等因素,将C/N值控制在6.5左右较为合理,此时对COD的去除率在90%以上,对氨氮的去除率在85%以上,对总氮的去除率为71.2%,N2O转化率为1.07%。Continuous flow biofilm reactor was used to treat the simulated sewage, the effects of five HRT levels （5.0, 6.5, 8.0, 9.5 and 11.0 h） and five C/N ratios （2.0, 3.5, 5.0, 6.5 and 8.0） on simultaneous nitrification and denitrification （SND） were investigated, and the nitrous oxide （N2 O） emission was discussed. The results showed that when HRT was 8.0 h, which was conducive to achieve SND and the optimum treatment efficiency, the removal rates of COD, NH4 -N and TN were over 90%, over 90% and 68.2% respectively, and the SND rate was 80.9%. N2O emission was the highest, and the N2O conversion rate was 3.44% at HRT =6.5 h. Higher C/N ratio was in favour of N2O reduction control, and N2O emission was highest in the system at C/N = 2.0. But considering factors such as ener- gy consumption and removal efficiency, controlling the C/N ratio at around 6.5 was relatively reasonable. At this ratio, the removal rates of COD, NH4 - N and TN were over 90% , over 85% and 71.2% re- spectively, and N2O conversion rate was 1.07%.

关 键 词：生物膜反应器 同步硝化反硝化 一氧化二氮 水力停留时间 C/N值 

分 类 号：X703[环境科学与工程—环境工程]