摘要
采用FeCl3对高浓度、高色度及可生化性差酵母废水进行了絮凝沉淀预处理,考察废水组成的变化,发现体系在初始pH为7.5,FeCl3用量为8g·L-1,搅拌速度及时间为300r·min-1(1min),80r·min-1(20min),沉降时间为30min时废水COD从6244mg·L-1降低到4058mg·L-1,废水的可生化性BOD5/COD值从0.28升高到0.46。GPC、GC-MS分析结果表明,废水经FeCl3絮凝预处理后,有机物浓度明显降低,极性类物质分子减少,主要是脂肪醇类、脂肪酸类、含有多个基团的苯环化合物、含氧杂环醇类等生物难降解物质,从而提高废水可生化性。
The coagulation-precipitation pretreatment of yeast wastewater with high colour, salinity and COD was carried out by using FeCl3. By investigating the composition variation of the wastewater, it is found that the COD removal of the wastewater decrease from 6244mg·L^-1 to 4 058mg·L^-1 when pH value is 7.5, the amount of FeCl3 is 8g·L^-1, precipitation time is 30 min, while the BOD5/COD ratio increase from 0.28 to 0.44. The results of GPC and GC/MS analysis indicate the concentration of most organic become lower, the amount of polar substance has reduced including some fatty alcohol, fatty acid and so on .All of these were difficult to degrade. Therefore, the coagulation-precipitation pretreatment is favourable to improve the biodegradability.
出处
《水处理技术》
CAS
CSCD
北大核心
2009年第5期40-43,52,共5页
Technology of Water Treatment
基金
国家环境保护总局(环办函[2005]86号)
国家杰出青年科学基金(40425001)
关键词
酵母废水
FECL3
絮凝沉淀
可生化性
机理
yeast wastewater
coagulation-precipitation by FeCl3
biodegradability
mechanism
