摘要
以银杏酮酯生产废水为试验对象,分别以污泥质量浓度(3 000、4 000、5 000、6 000、7 000 mg/L),pH(4、5、6、7、8、9),发酵温度(20、25、30、35、40、45℃)和发酵时间(3、4、5、6、7、8d)为工艺条件进行单因素试验;设计发酵温度、发酵时间、pH、污泥质量浓度4因素3水平L9(34)正交试验,得到厌氧发酵法降解该废水COD的最佳工艺参数,分析电化学氧化预处理对厌氧发酵法处理废水效果的影响。结果显示,厌氧发酵法处理该废水的最佳工艺参数为发酵温度35℃、发酵时间5d、pH7、污泥质量浓度5000mg/L,废水的COD去除率可达71.62%。采用电化学氧化+厌氧发酵处理银杏酮酯生产废水,该废水的COD去除率达90.62%,最终脱色率达96.42%,BOD5去除率达86.33%,发酵时间为3 d时,废水COD去除率已趋于稳定。可见,电化学氧化+厌氧发酵能明显提高银杏酮酯生产废水的COD去除率及脱色率,缩短发酵时间。
By use of the production wastewater of ginkgo ketone ester, we employed the single factor test to screen out the optimized process conditions. These conditions included a group of sludge mass concentration(3 000, 4 000, 5 000,6 000, 6 000, 7 000 mg/L), pH(4, 5, 6, 7, 8, 9), fermentation temperature(20, 25, 30, 35, 40, 45 ℃) and fermentation time(3, 4, 5, 6, 7, 8 d). The orthogonal test of 4 factors and 3 levels was designed based on fermentation temperature,fermentation time, pH and sludge mass concentration. The optimal process parameters for degradation of COD in wastewater by anaerobic fermentation were as follows: the fermentation temperature of 35 ℃, the fermentation time of 5 d, the pH of 7, and the sludge mass concentration of 5 000 mg/L. And the COD removal rate of wastewater reached71.62%. In this study, the influence of electrochemical oxidation pretreatment on the effect of anaerobic fermentation on the treatment of wastewater was also analyzed. After electrochemical oxidation+anaerobic fermentation treatment of ginkgo ketone ester production wastewater, the COD removal rate reached 90.62%, the decolorization rate reached96.42%, and the BOD5 removal rate reached 86.33%. When the fermentation time was 3 d, the removal rate of COD in the wastewater tended to be stable. We concluded that electrochemical oxidation+anaerobic fermentation could obviously improve the COD removal rate and decolorization rate of ginkgo ketone ester production wastewater, and shorten the fermentation time.
作者
王钰
高崎
史云祥
陈坤杰
WANG Yu;GAO Qi;SHI Yunxiang;CHEN Kunjie(College of Engineering, Nanjing Agricultural University, Nanjing, Jiangsu 210031, China;SPH Xing Ling Sci &Tech. Phannaceutical Company Limited, Shanghai 201703, China;Nanjing Dashan Environmental TechnologyCompany Limited, Nanjing, Jiangsu 211300, China)
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第3期301-306,共6页
Journal of Hunan Agricultural University(Natural Sciences)
基金
上海市省部级产学研项目(13DZ1970200)
关键词
银杏酮酯生产废水
厌氧发酵
电化学氧化
COD去除率
BOD5去除率
脱色率
ginkgo ketone ester production wastewater
anaerobic fermentation
electrochemical oxidation
COD removal rate
BOD5 removal rate
decolorization rate
