银杏酮酯生产废水处理工艺筛选
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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%,BOD_5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 BOD_5 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.
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 BOD_5 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.
引文
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[2]CHEN Z B,HU D X,ZHANG Z P.Modeling of twophase anaerobic process treating traditional Chinese medicine wastewater with the IWA Anaerobic Digestion Model No.1[J].Bioresource Technology,2009,100(20):4623-4631.
[3]戚飞,徐志斌.中药废水研究进展[J].广东化工,2017,44(23):98-99.
[4]车建刚,万金保,邓觅,等.中药废水处理的工程应用[J].水处理技术,2017,43(10):128-130,137.
[5]JIN L Y,ZHANG G M,TIAN H F.Current state of sewage treatment in China[J].Water Research,2014,66:85-98.
[6]余登喜,丁杰,刘先树,等.强化混凝预处理削减中药废水的毒性[J].环境工程学报,2016,10(11):6133-6138.
[7]唐朝春,段先月,叶鑫,等.石墨烯的制备及其在水处理中的应用研究进展[J].工业水处理,2017,37(3):10-15.
[8]王莘淇.磷酸铵镁沉淀法处理制药废水试验研究[J].环境科学与管理,2013,38(12):78-80.
[9]YAN L,MA H Z,WANG B,et al.Electrochemical treatment of petroleum refinery wastewater with threedimensional multi-phase electrode[J].Desalination,276(1/3):397-402.
[10]吴建春.浅谈厌氧生物处理工艺在污水处理工程中的应用[J].环境科学与管理,2013,38(4):103-105.
[11]LI W G,LV L Y,GONG X J,et al.Performance evaluation and hydraulic characteristics of an innovative controlled double circle anaerobic reactor for treating traditional Chinese medicine wastewater[J]Biochemical Engineering Journal,2017,128:186-194.
[12]LI W G,SU C Y,LIU X Z,et al.Influence of the organic loading rate on the performance and the granular sludge characteristics of an EGSB reactor used for treating traditional Chinese medicine wastewater[J].Environmental Science and Pollution Research,2014,21(13):8167-8175.
[13]陈锡剑,阎裕荣,李静,等.高浓度中药提取废水治理工程实例[J].中国给水排水,2014,30(8):76-79.
[14]齐美富,乐红燕,凌晓.IC+复合好氧反应器处理中药废水[J].环保科技,2009,15(4):35-38.
[15]AGHAPOUR A A,MOUSSAVI G,YAGHMAEIAN K.Degradation and COD removal of catechol in wastewater using the catalytic ozonation process combined with the cyclic rotating-bed biological reactor[J]Journal of Environmental Management,2015,157:262-266.
[16]LIU X L,REN N Q,YUAN Y X.Performance of a periodic anaerobic baffled reactor fed on Chinese traditional medicine industrial wastewater[J].Bioresource Technology,2009,100(1):104-110.
[17]易龙生,饶玲华,王鑫,等.餐厨垃圾厌氧发酵影响因素研究[J].环境科学与技术,2011,34(7):94-97.
[18]FERNANDES A,SANTOS D,PACHECO M J,et al.Electrochemical treatment of cork boiling wastewater with a boron-doped diamond anode[J].Environmental Technology,2015,36:26-35.
[19]CHEN J Y,LI N,ZHAO L.Three-dimensional electrode microbial fuel cell for hydrogen peroxide synthesis coupled to wastewater treatment[J].Journal of Power Sources,2014,254:316-322.
[20]国家环境保护总局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[21]陈俊,吴妍蓓,金杰,等.响应面法应用于臭氧处理偶氮废水优化研究[J].环境科学与技术,2018,41(8):146-152.