电-Fenton法预处理糖蜜酒精废液厌氧发酵出水  

Preatreatment of molasses alcohol anaerobic effluent by electro-Fenton oxidation

作　　者：任云[1] 张利亚[1] 张书廷[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《环境工程学报》2017年第1期353-358,共6页Chinese Journal of Environmental Engineering

摘　　要：糖蜜酒精废液厌氧发酵出水(以下简称厌氧发酵出水)有机物浓度高、色度大、可生化性差,是一种典型的难降解有机工业废水。为提高废水的可生化性,采用电Fenton工艺预处理糖蜜酒精废液厌氧发酵出水,研究了电Fenton反应中影响因子对废水COD去除速率和BOD5/COD(B/C)值的影响。结果表明,当初始pH调至3,电流密度0.6 m A·cm-2、H_2O_2(w/w,30%)投加量20 m L·L^(-1)、极间距2 cm、反应90 min后,废水COD去除率达75%,B/C由0.113增大为0.479,废水可生化性得到显著改善。同时发现,分步投加H_2O_2效果优于反应初始时刻一次性投加,反应的前30 min内结束投加效果最好。为探索糖蜜酒精废液厌氧发酵出水的高效处理方法提供了有意的参考。Molasses alcohol wastewater,an anaerobic effluent,is a typical industrial organic wastewater and is difficult to biodegrade. This molasses wastewater has a high concentration of organic substances,high degree of color,and low biodegradability. Electro-Fenton technology was introduced in this work to pretreat molasses alcohol wastewater,with the focus being on improving its biodegradability. The influence of various reaction factors on the removal rate of COD and the BOD5/ COD（ B / C） ratio were investigated,and its mechanism was analyzed. The results showed that the optimal experimental conditions were pH 3,H_2O_2 dosage 20 m L·L- 1,plate spacing 2 cm,current density 0. 6 m A·cm- 2,and reaction time 90 min. In these conditions,the removal efficiency for COD was 75%,and the value of BOD5/ COD in the wastewater increased to 0. 479. Furthermore,the method of H_2O_2 dosing significantly influenced the treatment effect of the electro-Fenton process. Gradually adding H_2O_2,instead of an initial large addition,produced a superior result. The COD removal rate and the B /C ratio increased with the decreasing feeding time,and were highest when the feeding time was 30 min. The results of this research should be of benefit in the subsequent treatment of actual wastewater.

关 键 词：糖蜜酒精废液厌氧发酵出水 电FENTON 可生化性 

分 类 号：X703[环境科学与工程—环境工程]