摘要:
试验采用摇动床缺氧-好氧工艺处理渔业加工废水，研究结果表明，摇动床缺氧-好氧工艺对污染物去除效果良好，在BOD5容积负荷为1.5 kg/(m3·d)，HRT=5.9～4.7 h，硝化液回流比为1.0的条件下，系统进水中COD、TN和NH+4-N的平均值分别为543.1、72.1和63.6 mg/L时，去除率分别达到93.6%、72.7%和98.9%，出水平均浓度值分别为34.1、19.5和0.7 mg/L，达到《城镇污水处理厂污染物排放标准》(GB 18918-2002) 一级标准。试验期间MLSS最高可达到17 425 mg/L，同时保持SVI在50～70 mL/g的低范围内，污泥沉降性能良好。通过显微镜观察，反应器中生物种类多样，从而保证了摇动床系统极低的污泥产率(MLSS/CODremoval为0.1891)，实现了污泥减量。
Abstract:
The swimbed anoxic and oxic technology was used to treat fishery wastewater in this experiment, and the study results demonstrated good treatment performance of pollutants and sludge reduction. Under the condition of BOD volumetric loading of 1.5 kg/(m3·d), the HRT of 5.9～4.7 h and mixed liquid recycle ratio of 1.0, when the influent average COD,TN,NH+4-N concentration were 543.1 mg/L,72.1 mg/L, 63.6 mg/L, COD, TN and NH+4-N removal efficiencies reached to 93.6%,72.7%,98.9%,respectively. Effluent average COD, TN and NH+4-N concentration were 34.1 mg/L,0.7 mg/L,19.5 mg/L respectively，and effluent quality could be up to primary standard in the national discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002). The mixed liquor suspended solid (MLSS) concentration in the reactor reached 17 425 mg/L at the highest during operation period, with holding 50～70 mL/g of SVI. Protozoan and metazoans on the bio-film and suspended sludge were proved existing in the system by microscopic observation. Very low sludge yield of 0.1891 kg MLSS/kg CODremoval was obtained in swim-bed system.
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