| 无排泥运行MBR处理不同浓度氨氮废水及其生物特性 |
| 摘要点击 1455 全文点击 1202 投稿时间：2005-01-14 修订日期：2005-06-08 |
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| 中文关键词 MBR 硝化 生物量 微生物产物 生物活性 氨氮 |
| 英文关键词 MBR nitrification biomass microbial product biomass activity NH_4~+-N |
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| 中文摘要 |
| 考察了水力停留时间(HRT)为10 h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NH4+-N≤500 mg/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0.52 kg/(kg·d);当NH4+-N≥700 mg/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3 200 mg/L上升至6 700 mg/L.反应器中的氨氧化菌维持在107CFU/mL,亚硝酸盐氧化菌从106CFU/mL下降至103CFU/mL.系统内的溶解性微生物产物(以TOC表示)升至65 mg/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600 mg/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 107CFU/mL and the nitrite oxidizers decreased from 106CFU/mL to 103CFU/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. |
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