摘要
对加压活性污泥法处理有机中间体废水进行了研究。主要考察了停留时间（HRT）、污泥浓度（MLSS）和反应压力等条件对COD去除率的影响。有机中间体废水经铁炭预处理后。COD从原来的8000mg／L降到5000mg／L左右，BODs／COD由原来的0．20升高到0．40左右。当反应器内废水混合后COD2000mg／L时，在反应压力0．10MPa、污泥质量浓度3～5g／L、停留时间8～10h条件下，出水COD小于600mg／L。COD去除率大于70％;出水经混凝沉淀处理后COD小于400mg／L，可以达到《污水综合排放标准》（GB8978-1996）三级标准。与常规的活性樗泥处理方法相比．加压活性污泥法具有处理速度快、降解效率高和容积负荷大等优点。
A difficult to treat organic intermediates wastewater （COD〉 8 000 mg/L, pH 〈C 3, color 〉 200 times dilution, BOD5/COD 〈 0.20） was pretreated by the iron carbon redox process and, after pH adjustment and precipitate then treated by the pressurized activated sludge process. Investigations were performed to determine the effects of aeration time, mixed liquor suspended solids （MLSS） concentration, operating pressure on the treatment effectiveness. The pretreatment in a small Fe-carbon bed （11 L, flowrate = 1. 5 h/L） reduced COD （to 5 000 rag/L） and color （to 50 times dilution） of the feed white significantly improved its biodegradability （BOD5/COD = 0.40）. Under the conditions of starting COD=2 000 mg/L, pressure：0. 10 MPa, MLSS =3-5 g/L, aeration time 10 h, the secondary treatment in a small batch reactor （12 L working volume） achieved a COD removal rate of 〉 70% （effluent COD 〈C 600 mg/L）. The effluent COD was further reduced （to 〈400 mg/L） by post treatment of coagulation and sedimentation for meeting the national third-class Integrated Wastewater Discharge Standard （GB 8978-1996）. Compared with the conventional activated sludge process, the pressurized process has the advantages of high organic loading, better COD removal, and less land requirement.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2006年第12期941-943,946,共4页
Environmental Pollution & Control
基金
浙江省科技计划资助项目(No.2003C33037)。
关键词
有机中间体废水
加压活性污泥
铁炭预处理
Organic intermediates wastewater Pressurized activated sludge Iron-carbon pretreatment
