摘要
Abstract
Owing to its alkaline nature and association with oil-containing waste streams from iron and steel industry,cold-rolling wastewater is very difficult to treat.In this paper,an anaerobic dynamic membrane bioreactor (AnDMBR) was designed to treat cold-rolling wastewater.To acclimatize the anaerobic sludge to the wastewater,wastewater was added into the reactor in a stepwise increasing mode.The AnDMBR was operated at the hydraulic retention time (HRT) of 2.5 d with membrane flux of 6 L · (m2 · h)-1 After the acclimation period of 88 days,the effluent could be maintained at about 500 mg · L-1 with the influent COD of 2 500 mg · L-1.The CH4 yield was 0.151 L · g-1 The operation cycle of dynamic membrane filtration was divided into three stages as follows:formation stage,stable stage,and clogged stage.In the formation stage,the turbidity of the effluent decreased as the dynamic membrane formed gradually.Afterward,the turbidity remained at a stable level as the dynamic membrane finally formed,and this period was called the stable stage.In the clogged stage,the transmembrane pressure increased dramatically and the turbidity of the effluent increased to some extent.At the same time,the microbial communities in the anaerobic sludge of the different phases were investigated.Clostridia,Bacteroidia,Anaerolineae,OP8_1,and Spirochaetes were found to be the main bacterial classes in the reactor,among which Bacteroidia were the dominant class.Methanolinea and Methanosaeta were the main archael genera,with Methanosaeta becoming more dominant in long-term operations.关键词
平整液废水/厌氧动态膜生物反应器/微生物分析/污水处理Key words
cold-rolling wastewater/AnDMBR/microbial community analysis/wastewater treatment分类
资源环境
