缺氧酸化联合零价铁-过氧化氢改善污泥脱水性能的研究
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摘要
为探讨缺氧酸化联合零价铁(ZVI)-过氧化氢(H_2O_2)调理对污泥脱水性能的影响,本文通过单因素试验,以污泥比阻(SRF)作为参考指标,系统考察了调理条件对污泥脱水性能的影响.同时,在试验的最佳调理条件下,分析了污泥各层胞外聚合物(EPS)有机物质量浓度及荧光光谱强度以阐明该联合作用机理.结果表明,当初始pH为2,ZVI投加量为280 mg·g~(-1)(以干污泥量(DS)计,下同),缺氧时间为4 h,H_2O_2投加量为30 mg·g~(-1)(以DS计,下同),类芬顿反应时间为10 min时,SRF降低了90.39%,处理效果较单独类芬顿处理提升了1倍.机理探究试验表明,在缺氧条件下,酸化处理可加速污泥的水解,溶解得到更多的二价铁离子,促使EPS结构发生改变;ZVI-H_2O_2调理可有效地氧化部分EPS,使得紧密结合胞外聚合物(TB-EPS)破解转化至松散结合胞外聚合物(LB-EPS)和上清液胞外聚合物(SB-EPS).EPS分析结果表明,蛋白质的减少能有效提高污泥脱水性能,腐殖酸和富里酸类有机物的产生能提高污泥疏水性能.此外,ZVI的再次利用效率高,重复利用仍能使SRF降低率达到82.04%.因此,缺氧酸化联合ZVI-H_2O_2处理能实现污泥的水解、氧化和絮凝过程,达到改善污泥脱水性能的目的.
The effect of anoxic acidification combined with zero value iron(ZVI) and hydrogen peroxide(H_2O_2) on sludge dewatering performance was studied in this study. The sludge dewaterability was evaluated by specific resistance of sludge(SRF). Through single factor experiment, the optimum reaction conditions were obtained. The mechanism of combined treatment was clarified by analyzing the organic matter concentration and the fluorescence spectrum intensity of Extracellular polymeric substances(EPS). The results show that SRF decreased by 90.39% when optimal conditions are initial pH=2, ZVI=280 mg·g~(-1) dry sludge(DS), 4 h of anoxic process, 30 mg·g~(-1) DS dosage of H_2O_2, and 10 min reaction time. Compared with ZVI-H_2O_2 treatment alone, the SRF value obtained by the combined treatment is reduced by half. Meanwhile, the mechanism of ZVI-H_2O_2 type Fenton-like reaction system and the recovery of ZVI were also discussed. The results show that anoxic acidification accelerated the hydrolysis of sludge flocs, release of ferrous ion and the structure change on EPS. ZVI-H_2O_2 oxidation treatment decomposed part of EPS. As a result, organic materials in TB-EPS were broken and transferred into LB-EPS and SB-EPS. EPS analysis showed that the reduction of protein could effectively improve the dewatering performance. The production of humic acid and fulvic acid enhanced the hydrophobic property. Moreover, the effect on recovery and reutilization of ZVI is well, and the reduction rate of SRF still can reach 82.04%. In general, the combination treatment can achieve the process of sludge hydrolysis, oxidation and flocculation, thus improving the performance of sludge dewatering.
The effect of anoxic acidification combined with zero value iron(ZVI) and hydrogen peroxide(H_2O_2) on sludge dewatering performance was studied in this study. The sludge dewaterability was evaluated by specific resistance of sludge(SRF). Through single factor experiment, the optimum reaction conditions were obtained. The mechanism of combined treatment was clarified by analyzing the organic matter concentration and the fluorescence spectrum intensity of Extracellular polymeric substances(EPS). The results show that SRF decreased by 90.39% when optimal conditions are initial pH=2, ZVI=280 mg·g~(-1) dry sludge(DS), 4 h of anoxic process, 30 mg·g~(-1) DS dosage of H_2O_2, and 10 min reaction time. Compared with ZVI-H_2O_2 treatment alone, the SRF value obtained by the combined treatment is reduced by half. Meanwhile, the mechanism of ZVI-H_2O_2 type Fenton-like reaction system and the recovery of ZVI were also discussed. The results show that anoxic acidification accelerated the hydrolysis of sludge flocs, release of ferrous ion and the structure change on EPS. ZVI-H_2O_2 oxidation treatment decomposed part of EPS. As a result, organic materials in TB-EPS were broken and transferred into LB-EPS and SB-EPS. EPS analysis showed that the reduction of protein could effectively improve the dewatering performance. The production of humic acid and fulvic acid enhanced the hydrophobic property. Moreover, the effect on recovery and reutilization of ZVI is well, and the reduction rate of SRF still can reach 82.04%. In general, the combination treatment can achieve the process of sludge hydrolysis, oxidation and flocculation, thus improving the performance of sludge dewatering.
引文
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曹秉帝,张伟军,王东升,等.2015.高铁酸钾调理改善活性污泥脱水性能的反应机制研究[J].环境科学学报,35(12):3805-3814
Chen W,Westerhoff P,Leenheer J A,et al.2003.Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J].Environmental Science&Technology,37:5701-5710
Dai Y,Huang S,Liang J,et al.2017.Role of organic compounds from different EPS fractions and their effect on sludge dewaterability by combining anaerobically mesophilic digestion pre-preatment and Fenton's reagent/lime[J].Chemical Engineering Journal,321:123-138
Gaudy A F.1962.Colorimetric determination of protein and carbohydrate[J].Ind Water Wastes,7:17-22
Goodwin J A S,Forster C F.1985.A further examination into the composition of activated sludge surfaces in relation to their settlement characteristics[J].Water Research,19(4):527-533
He D,Wang L,Jiang H,et al.2015.A Fenton-like process for the enhanced activated sludge dewatering[J].Chemical Engineering Journal,272:128-134
He D,Zhang Y,He C,et al.2017.Changing profiles of bound water content and distribution in the activated sludge treatment by Na Cl addition and pH modification[J].Chemosphere,186:702
Hu S,Hu J,Liu B,et al.2018.In situ generation of zero valent iron for enhanced hydroxyl radical oxidation in an electrooxidation system for sewage sludge dewatering[J].Water Research,145:162-171
黄绍松,梁嘉林,张斯玮,等.2018.Fenton氧化联合氧化钙调理对污泥脱水的机理研究[J].环境科学学报,38(5):1906-1919
Liang J,Huang S,Dai Y,et al.2015.Dewaterability of five sewage sludges in Guangzhou conditioned with Fenton's reagent/lime and pilot-scale experiments using ultrahigh pressure filtration system[J].Water Research,84:243-254
李恺,叶志平,王凤英,等.2010.冷融技术联合化学调理对污泥脱水性能的影响及其机理[J].环境科学学报,30(3):536-543
Liu Y,Fang H.2003.Influence of extracellular polymeric substances(EPS)on flocculation,settling,and dewatering of activated sludge[J].Critical Reviews in Environmental Science and Technology,33(3):237-273
Liu Y,Zhang Y,Quan X,et al.2011.Applying an electric field in a builtin zero valent iron-Anaerobic reactor for enhancement of sludge granulation[J].Water Research,45(3):1258-1266
Mikkelsen L H,Keiding K.2002.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Research,36(10):2451
牛美青,张伟军,王东升,等.2012.不同混凝剂对污泥脱水性能的影响研究[J].环境科学学报,32(9):2126-2133
Rui C M,Lopes D V,Quina M J,et al.2012.Treatment improvement of urban landfill leachates by Fenton-like process using ZVI[J].Chemical Engineering Journal,192(2):219-225
汤连生,郑邓衡,赵占仑.2018.污泥不同脱水方法的实验分析及脱水机理探讨[J].环境工程学报,12(5):1536-1546
Wang Q,Sun J,Song K,et al.2017.Combined zero valent iron and hydrogen peroxide conditioning significantly enhances the dewaterability of anaerobic digestate[J].Journal of Environmental Sciences,67(5):378-386
Xiao K,Chen Y,Jiang X,et al.2016.Characterization of key organic compounds affecting sludge dewaterability during ultrasonication and acidification treatments[J].Water Research,105:470
Wang Z P,Zhang T.2010.Characterization of soluble microbial products(SMP)under stressful conditions[J].Water Research,44(18):5499-5509
Yu W,Yang J,Shi Y,et al.2016.Roles of iron species and p Hoptimization on sewage sludge conditioning with Fenton's reagent and lime[J].Water Research,95:124-133
张昊,杨家宽,虞文波,等.2013.Fenton试剂与骨架构建体复合调理剂对污泥脱水性能的影响[J].环境科学学报,33(10):2742-2749
张伟军.2015.基于污泥高压脱水的化学预调理反应机制研究[D].北京:中国科学院大学
Zhang W,Yang P,Yang X,et al.2015.Insights into the respective role of acidification and oxidation for enhancing anaerobic digested sludge dewatering performance with Fenton process[J].Bioresource Technology,181:247-253
中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.2009.GB/T 24600-2009.城镇污水处理厂污泥处置土地改良用泥质[S].北京:中国标准出版社
中华人民共和国建设部.2005.CJ/T 221-2005.城市污水处理厂污泥检验方法[S].北京:中华人民共和国建设部
中华人民共和国建设部.2007.CJ/T 249-2007.城镇污水处理厂污泥处置混合填埋泥质[S].北京:中华人民共和国建设部
Zhou X,Jiang G,Zhang T,et al.2015.Role of extracellular polymeric substances in improvement of sludge dewaterability through peroxidation[J].Bioresource Technology,192:817-820
Zhou X,Wang Q,Jiang G,et al.2014.Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide[J].Bioresource Technology,174:103-107
曹秉帝,张伟军,王东升,等.2015.高铁酸钾调理改善活性污泥脱水性能的反应机制研究[J].环境科学学报,35(12):3805-3814
Chen W,Westerhoff P,Leenheer J A,et al.2003.Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J].Environmental Science&Technology,37:5701-5710
Dai Y,Huang S,Liang J,et al.2017.Role of organic compounds from different EPS fractions and their effect on sludge dewaterability by combining anaerobically mesophilic digestion pre-preatment and Fenton's reagent/lime[J].Chemical Engineering Journal,321:123-138
Gaudy A F.1962.Colorimetric determination of protein and carbohydrate[J].Ind Water Wastes,7:17-22
Goodwin J A S,Forster C F.1985.A further examination into the composition of activated sludge surfaces in relation to their settlement characteristics[J].Water Research,19(4):527-533
He D,Wang L,Jiang H,et al.2015.A Fenton-like process for the enhanced activated sludge dewatering[J].Chemical Engineering Journal,272:128-134
He D,Zhang Y,He C,et al.2017.Changing profiles of bound water content and distribution in the activated sludge treatment by Na Cl addition and pH modification[J].Chemosphere,186:702
Hu S,Hu J,Liu B,et al.2018.In situ generation of zero valent iron for enhanced hydroxyl radical oxidation in an electrooxidation system for sewage sludge dewatering[J].Water Research,145:162-171
黄绍松,梁嘉林,张斯玮,等.2018.Fenton氧化联合氧化钙调理对污泥脱水的机理研究[J].环境科学学报,38(5):1906-1919
Liang J,Huang S,Dai Y,et al.2015.Dewaterability of five sewage sludges in Guangzhou conditioned with Fenton's reagent/lime and pilot-scale experiments using ultrahigh pressure filtration system[J].Water Research,84:243-254
李恺,叶志平,王凤英,等.2010.冷融技术联合化学调理对污泥脱水性能的影响及其机理[J].环境科学学报,30(3):536-543
Liu Y,Fang H.2003.Influence of extracellular polymeric substances(EPS)on flocculation,settling,and dewatering of activated sludge[J].Critical Reviews in Environmental Science and Technology,33(3):237-273
Liu Y,Zhang Y,Quan X,et al.2011.Applying an electric field in a builtin zero valent iron-Anaerobic reactor for enhancement of sludge granulation[J].Water Research,45(3):1258-1266
Mikkelsen L H,Keiding K.2002.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Research,36(10):2451
牛美青,张伟军,王东升,等.2012.不同混凝剂对污泥脱水性能的影响研究[J].环境科学学报,32(9):2126-2133
Rui C M,Lopes D V,Quina M J,et al.2012.Treatment improvement of urban landfill leachates by Fenton-like process using ZVI[J].Chemical Engineering Journal,192(2):219-225
汤连生,郑邓衡,赵占仑.2018.污泥不同脱水方法的实验分析及脱水机理探讨[J].环境工程学报,12(5):1536-1546
Wang Q,Sun J,Song K,et al.2017.Combined zero valent iron and hydrogen peroxide conditioning significantly enhances the dewaterability of anaerobic digestate[J].Journal of Environmental Sciences,67(5):378-386
Xiao K,Chen Y,Jiang X,et al.2016.Characterization of key organic compounds affecting sludge dewaterability during ultrasonication and acidification treatments[J].Water Research,105:470
Wang Z P,Zhang T.2010.Characterization of soluble microbial products(SMP)under stressful conditions[J].Water Research,44(18):5499-5509
Yu W,Yang J,Shi Y,et al.2016.Roles of iron species and p Hoptimization on sewage sludge conditioning with Fenton's reagent and lime[J].Water Research,95:124-133
张昊,杨家宽,虞文波,等.2013.Fenton试剂与骨架构建体复合调理剂对污泥脱水性能的影响[J].环境科学学报,33(10):2742-2749
张伟军.2015.基于污泥高压脱水的化学预调理反应机制研究[D].北京:中国科学院大学
Zhang W,Yang P,Yang X,et al.2015.Insights into the respective role of acidification and oxidation for enhancing anaerobic digested sludge dewatering performance with Fenton process[J].Bioresource Technology,181:247-253
中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.2009.GB/T 24600-2009.城镇污水处理厂污泥处置土地改良用泥质[S].北京:中国标准出版社
中华人民共和国建设部.2005.CJ/T 221-2005.城市污水处理厂污泥检验方法[S].北京:中华人民共和国建设部
中华人民共和国建设部.2007.CJ/T 249-2007.城镇污水处理厂污泥处置混合填埋泥质[S].北京:中华人民共和国建设部
Zhou X,Jiang G,Zhang T,et al.2015.Role of extracellular polymeric substances in improvement of sludge dewaterability through peroxidation[J].Bioresource Technology,192:817-820
Zhou X,Wang Q,Jiang G,et al.2014.Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide[J].Bioresource Technology,174:103-107