厌氧氨氧化工艺的基质抑制及其恢复策略  

Substrate Inhibition and Recovery Strategies for Anammox Process

作　　者：唐崇俭[1] 郑平[1] 陈小光[1] 

机构地区：[1]浙江大学环境工程系,浙江杭州310029

出　　处：《应用基础与工程科学学报》2010年第4期561-570,共10页Journal of Basic Science and Engineering

基　　金：国家高技术研究发展计划(863)项目(2009AA06Z311);国家自然科学基金(30770039);国家科技支撑计划项目(2008BADC4B05)

摘　　要：氨和亚硝酸盐是厌氧氨氧化菌的基质,但同时也是毒性物质.通过提升UASB反应器的进水基质浓度研究了两种基质的抑制特性,针对其抑制特性,研究了不同的恢复策略及其恢复性能.结果表明,亚硝酸盐的毒性显著强于氨,当亚硝酸盐抑制相对较轻时(出水亚硝酸盐浓度低于抑制常数K_(IH,NO_2^--N):632mg/L),通过降低进水基质浓度,反应器的脱氮性能可快速恢复(恢复时间为15d,恢复程度为100%);当亚硝酸盐抑制相对较重时(出水亚硝酸盐浓度高于632mg/L),采用慢速恢复策略,有效恢复时间为39d,恢复程度仅为89%.当游离氨浓度达83—130mgN/L时也可抑制反应器的脱氮功能,及时调低反应液pH值6.8—7.0可有效解除游离氨抑制,反应器的脱氮性能可较快并完全恢复(恢复时间1d,恢复程度100%).Ammonium and nitrite are the two substrates of anaerobic ammonium-oxidizing （Anammox） bacteria,but they are potential inhibitors when their concentrations surpass the threshold inhibition values.The inhibition characteristics of the two substrates（nitrite and ammonia） were investigated by raising the influent substrate concentrations of an Anammox UASB bioreactor.Subsequently,different recovery strategies were carried out based on the inhibition characteristics of the two substrates.Results showed that nitrite was more toxic than ammonium.When the nitrite inhibition was relatively slighter,characterized by effluent nitrite concentration lower than the inhibition parameter（KIH,NO2^--N）,632mg/L）,nitrogen removal performance completely recovered within 15 days（recovery degree,100%） by decreasing the influent nitrite concentration.However,severer nitrite inhibition（effluent nitrite concentration was higher than 632mg/L）,resulted in worse recovery performance.The recovery degree only achieved 89%after 39 days by applying slow-recovery strategy.Besides,inhibition caused by free ammonia（FA） was also observed when the free ammonia concentration reached 83—130mg N/L.The recovery degree achieved 100%after 1 day by decreasing the pH to 6.8—7.0.

关 键 词：厌氧氨氧化 基质抑制 恢复策略 

分 类 号：X703[环境科学与工程—环境工程]