泳动床技术处理高浓度废水特性研究

Characteristics of Sludge in Treatment of High Concentrated Organic Wastewater by Swim-Bed Technology

在泳动床反应器进水COD浓度为2400～4600mg/L,容积负荷为1.7～4.5kg/(m3.d)的运行条件下,对污染物去除效果良好,COD去除率均值达96%,系统平均硝化率为80.7%.MLSS最高可达到23g/L,并能在高MLSS的同时保持SVI在20～50mL/g的低范围内,污泥沉降性很好.研究表明,黏度和MLSS间服从指数相关,并有颗粒化污泥絮体产生.通过DNA测定和显微镜观察,反应器中生物种类多样,从而保证了泳动床系统极低的污泥产率(MLSS/BOD=0.1046～0.1723),实现了污泥减量.

Based on the technology of conditional activated sludge process, swim-bed technology involving the novel biomass attachment material biofringe （BF） is one of the new and efficient advanced municipal wastewater treatments process. The process demonstrated effective treatment of high concentrated organic wastewater. When VLRs were from 1.7 kg/（m^3 ·d） to 4.5 kg/（m^3 ·d）, 96 % of average COD removal efficiencies and 80.7 % of nitrification rate were achieved, respectively. The BF material allowed for attachment of large amounts of biomass. The mixed liquor suspended solid （MISS） concentrations in the reactor reached 23 g/L at the highest during operation period, with holding 20-50 mL/g of SVI. An exponential law was found to be suitable to describe the variation of the viscosity as a function of MISS. The granulation phenomenon of sludge was observed during the experiment. Protozoan and metazoans on the bio-film and suspended sludge were proved existing in the system by microscopic observation and DNA experiment. Observed sludge yields from 0. 104 6 to 0. 172 3 （MLSS/BOD） were obtained in swim-bed system.