中文摘要：

考察了水力停留时间（HRT）为10h时无排泥运行下膜-生物反应器（MBR）处理不同浓度氨氮无机废水的运行性能及微生物特性．结果表明，在处理NN4^＋-N≤500mg／L的废水时，氨氮转化率可达99％且反应器内微生物增长缓慢，比硝化速率从0．2kg／（kg·d）升至0．52kg／（kg·d）；当NH4^＋-N≥700mg／L时，出水亚硝酸氮和氨氮相继出现明显累积，比硝化速率随之下降至0．4kg／（kg·d）以下，反应器内生物量从3200mg／L上升至6700mg／L．反应器中的氨氧化菌维持在10^7CFU／mL，亚硝酸盐氧化菌从10^6CFU／mL下降至10^3CFU／mL．系统内的溶解性微生物产物（以TOC表示）升至65mg／L后保持稳定，出水TOC一直维持在3-4mg／L；细胞外分泌物（EPS）在膜的截流作用下随运行时间的延长积累至600mg／L．

英文摘要：

This work reports the results of performance and microbial characteristics in a membrane bioreactor （MBR） operated on inorganic ammonium-bearing wastewater for about 200 days at a hydraulic retention time （HRT） of 10 h and without sludge withdrawal. Under the conditions of ammonia concentration ≤ 500 mg/L, 99% NH4^＋-N conversion rate could be achieved and biomass in the reactor changed little. The specific nitrification rate increased from 0.2 kg/（kg· d） to 0.52 kg/（kg· d）. Accumulation of nitrite and ammonium appeared when the influent ammonia reached 700 mg/L, consequently the specific nitrification decreased to below 0.4 kg/（kg· d）. However, although biomass in the bioreactor fleetly increased from 3 200 mg/L to the final 6 700 mg/L, the amount of ammonia oxidizers still kept at 10^7CFU/mL and the nitrite oxidizers decreased from 10^6CFU/mL to 10^3CFU/mL. Soluble microbial production （expressed as TOC） in the effluent was kept at around 3-4mg/L, while that in the reactor increased to 65 mg/L and then almost unchanged, Due to the interception of membrane, extracellular polymeric substrates （EPS） increased to 600 mg/L in the end.