缺氧/好氧膜-生物反应器处理高浓度含碳和氮工业废水

采用缺氧 /好氧膜 生物反应器 (MBR)处理高浓度含碳和氮工业废水 ,在缺氧反应器的水力停留时间 (HRT)为 5h ,好氧MBR的HRT分别为 1 5、1 0、6h时 ,考察了系统的同时除碳脱氮性能。结果表明 ,好氧MBR的HRT在试验范围内对系统的处理效果没有明显影响 ,即使MBR的HRT降低到 6h,系统对化学需氧量 (COD)、氨氮和总氮的去除率仍可达到 94%、90 %和 73 %以上 ,出水水质达到国家一级排放标准 ;系统中的生物反应对有机物和氮的去除起主要作用 ,但膜对混合液上清液COD有一定去除 ,主要对相对分子质量大于 1 0万的有机物有截留 ;由于膜的高效截留作用 ,MBR中可保持高浓度的污泥量和高硝化活性 ,确保了硝化反应的高效进行

Anoxic/aerobic membrane bioreactor for treatment of industrial wastewater containing high strength of carbon and nitrogen

A laboratory scale anoxic/aerobic membrane bioreactor (MBR) was studied for treatment of industrial waste water containing high carbon and nitrogen concentration.The performance of simultaneous carbon and nitrogen removals was studied when hydraulic residence time(HRT) of anoxic reactor was 5 h and HRT of MBR was 15,10,6 h,respectively.Obvious effects of HRT of MBR on system performance was not found.Results show that chemical oxygen demand(COD),NH + 4 N and total nitrogen (TN) removals are over 94%,90% and 73%,respectively even though HRT of MBR is decreased to 6 h.Organic and nitrogen removals are mostly contributed by biological reaction in the process,but the membrane could intercept a part of COD in the supernatant in the mixed liquor,when molecular weight of which is higher than 100 000.High sludge concentration and nitrification activity could be achieved because of membrane separation,a high performance of nitrification would be assured in MBR.