基于Fe~(3+)/EDTA-2Na的类芬顿污泥预处理技术
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摘要
为解决芬顿技术在中性条件下氧化性能较低的问题,以浓缩池污泥为研究对象,应用Fe~(3+)/EDTA-2Na类芬顿技术处理污泥,对污泥脱水性能(污泥/泥饼含水率、污泥比阻(SRF)、毛细吸水时间(CST))、沉降性能(污泥沉降比(SV)、污泥容积指数(SVI))及破解性能(污泥质量浓度、溶解性COD(SCOD)、胞外聚合物(EPS))的改善情况进行了研究。结果表明,Fe~(3+)/EDTA-2Na类芬顿反应能起到强氧化作用调理污泥,且在原污泥pH值条件下效果优于传统芬顿法。Fe~(3+)/EDTA-2Na类芬顿反应后污泥/泥饼含水率分别降至97.94%和77.87%,CST仅为17 s,SV和SVI分别降至29%和49.15mL/g,MLSS和MLVSS较原污泥分别降低41.35%和40.91%,且污泥上清液中SCOD、蛋白质、多糖溶出最多,对污泥脱水、沉降、破解性能的改善效果明显。
In order to solve the problem of low oxidation performance of Fenton process under the neutral conditions,the paper intends to make a comparison between the Fenton and Fenton-like processing method with Fe~(3+)/EDTA-2 Na for treating the content concentrated sludge.For the said purpose,we have made a comprehensive investigation of the 3 sets of parameters,including the sludge dewatering performance(such as the water content of sludge and mud cake,SRF and CST),the settlement performance(for example,SV and SVI) and the cracking performance(for instance,the sludge concentration,SCOD and EPS) in the paper.The results of the dewatering performance tests indicate that the water content of the sludge and mud cake,as well as the CST tend to decrease by 97.94%,77.87%,and 17 s,respectively.On the other hand,the dewatering performance of the Fe~(3+)/EDTA-2 Na Fenton-like process proves to be superior over the traditional Fenton one,whereas the parameters of SV and SVI tend to be reduced to 29% and 49.15 mL/g.What is more,the settlement performance of sludge has been obviously improved for the oxidizing ability of Fe~(3+)/EDTA-2 Na Fenton-like process has been made stronger than the Fenton process under the neutral pH.Besides,and,the OH radicals produced in the above said Fenton-like processing has become the key to the sludge dewatering success.And,since the granule of the sludge turns to be more compact and dense due to the spoilt sludge structure by OH radicals,the oxidizing ability of the Fe~(3+)/EDTA-2 Na Fenton-like process may become stronger under the neutral conditions,and,needless to regulate its pH value,the cracking performance has been made superior over the Fenton process.What is more,the removal efficiency of MLSS and MLVSS has been made a lot more reduced to as much as to 41.35% and 40.91%,accordingly and respectively.On the other hand,the high concentrations of SCOD as well as the proteins and polysaccharides of EPS in the sludge prove to be supernatant during the Fe~(3+)/EDTA-2 Na Fenton-like process.Furthermore,the concentration of TB-EPS can be made decreased while the proportion of LB-EPS and S-EPS tends to increase.All in all,the Fe~(3+)/EDTA-2 Na Fenton-like process can be made into a low-cost and easy-realizable technology to deal with the sewage sludge and achieve better performance than Fenton process under the neutral pH condition.
In order to solve the problem of low oxidation performance of Fenton process under the neutral conditions,the paper intends to make a comparison between the Fenton and Fenton-like processing method with Fe~(3+)/EDTA-2 Na for treating the content concentrated sludge.For the said purpose,we have made a comprehensive investigation of the 3 sets of parameters,including the sludge dewatering performance(such as the water content of sludge and mud cake,SRF and CST),the settlement performance(for example,SV and SVI) and the cracking performance(for instance,the sludge concentration,SCOD and EPS) in the paper.The results of the dewatering performance tests indicate that the water content of the sludge and mud cake,as well as the CST tend to decrease by 97.94%,77.87%,and 17 s,respectively.On the other hand,the dewatering performance of the Fe~(3+)/EDTA-2 Na Fenton-like process proves to be superior over the traditional Fenton one,whereas the parameters of SV and SVI tend to be reduced to 29% and 49.15 mL/g.What is more,the settlement performance of sludge has been obviously improved for the oxidizing ability of Fe~(3+)/EDTA-2 Na Fenton-like process has been made stronger than the Fenton process under the neutral pH.Besides,and,the OH radicals produced in the above said Fenton-like processing has become the key to the sludge dewatering success.And,since the granule of the sludge turns to be more compact and dense due to the spoilt sludge structure by OH radicals,the oxidizing ability of the Fe~(3+)/EDTA-2 Na Fenton-like process may become stronger under the neutral conditions,and,needless to regulate its pH value,the cracking performance has been made superior over the Fenton process.What is more,the removal efficiency of MLSS and MLVSS has been made a lot more reduced to as much as to 41.35% and 40.91%,accordingly and respectively.On the other hand,the high concentrations of SCOD as well as the proteins and polysaccharides of EPS in the sludge prove to be supernatant during the Fe~(3+)/EDTA-2 Na Fenton-like process.Furthermore,the concentration of TB-EPS can be made decreased while the proportion of LB-EPS and S-EPS tends to increase.All in all,the Fe~(3+)/EDTA-2 Na Fenton-like process can be made into a low-cost and easy-realizable technology to deal with the sewage sludge and achieve better performance than Fenton process under the neutral pH condition.
引文
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[8]TAN Dejun(谭德俊),ZHANG Shenghan(张盛汉),WANG Miling(王密灵),et al.In situ oxidation regeneration of the used activated carbon and its application in tertiary treatment of bioeffiuents of dyestuff-making sewage[J].Journal of Safety and Environment(安全与环境学报),2014,14(1):193-197.
[9]PEREZ M,TORRADES F,DOMENECH X,et al.Fenton and photoFenton oxidation of textile effluents[J].Water Research,2002,36(11):2703-2710.
[10]ZHANG Yangyang(张杨阳),YUAN Chungang(苑春刚),ZHANGYan(张艳),et al.Elemental mercury removal by Fenton-like reaction system[J].Environmental Chemistry(环境化学),2012,31(12):1891-1895.
[11]LIN Guanghui(林光辉),WU Jinhua(吴锦华),LI Ping(李平),et al.Effective degradation of reactive brilliant orange X-GNby heterogeneous Fenton reaction using zero-valent iron and H2O2[J].Chinese Journal of Environmental Engineering(环境工程学报),2013,7(3):913-917.
[12]ZHOU Wuyang(周午阳),ZHANG Chaosheng(张朝升),SUNZhimin(孙志民),et al.Treatment of wastewater containing highconcentration dimethyl phthalate by Fenton oxidation under Cu2+catalysis[J].Chinese Journal of Environmental Engineering(环境工程学报),2014,8(7):2789-2794.
[13]GUO Xingfei(郭幸斐),WANG Yaowu(王姚武),ZHANGHongwei(张宏伟),et al.Study on the degradation of methylene blue by Fenton-like reagent[J].Environmental Science&Technology(环境科学与技术),2016(5):38-41.
[14]WANG Shidong(王士东),YANG Qi(杨琦),WANG Shizong(王诗宗),et al.Comparison between the two extraction methods of extracellular polymers from the aerobic sludge and its adsorption of dye rhodamine B[J].Journal of Safety and Environment(安全与环境学报),2014,14(1):172-176.
[15]DUBOIS M,GILLES K A,HAMILTON J K,et al.Colorimetric method for determination of sugars and related substances[J].Analytical Chemistry,1956,28(3):350-356.
[16]FANG Jingyu(方静雨),MA Zengyi(马增益),YAN Jianhua(严建华),et al.Comparative investigation of parameters for determining the dewaterability of activated sludge[J].Energy Engineerin(能源工程),2011(4):51-53.
[17]LIU Huan(刘欢),YANG Jiakuan(杨家宽),SHI Yafei(时亚飞),et al.Relationship of evaluation indexes of sludge dewatering performance under different conditioning programs[J].Environmental Science(环境科学),2011,32(11):3394-3399.
[18]WANG Lei(王磊),ZHANG Chen(张辰),TAN Xuejun(谭学军),et al.Characteristic indexes of deep dewatering performance of urban sewage sludge[J].Water Purification Technology(净水技术),2017(8):42-45.
[19]LIU Peng(刘鹏),LIU Huan(刘欢),YAO Hong(姚洪),et al.Influence of Fenton's reagent and skeleton builders on sludge dewatering performance[J].Environmental Science&Technology(环境科学与技术),2013(10):146-151.:
[20]WANG Zixin(王子昕),FANG Guixian(方桂仙),CAO Jingfang(曹静芳),et al.Method for improving sedimentation performance of activated sludge[J].Environmental Engineering(环境工程),1987(6):9-13.
[21]LU Wen(鹿雯).The influence of extracellular polymeric substance(EPS)on physical-chemical properties of sludge[J].Environmental Science and Management(环境科学与管理),2007,32(5):27-30.
[22]LIU H,YANG J,ZHU N,et al.A comprehensive insight into the combined effects of Fenton's reagent and skeleton builders on sludge deep dewatering performance[J].Journal of Hazardous Materials,2013,258(258/259C):144-150.
[23]WANG Hongwu(王红武),LI Xiaoyan(李晓岩),ZHAO Qingxiang(赵庆祥),et al.Surface properties of activated sludge and their effects on settlleability and dewaterability[J].Journal of Tsinghua University:Science and Technology(清华大学学报:自然科学版),2004,44(6):766-769.
[24]LI X Y,YANG S F.Influence of loosely bound extracellular polymeric substances(EPS)on the flocculation,sedimentation and dewaterability of activated sludge[J].Water Research,2007,41(5):1022-1030.
[25]HE Peipei(何培培),YU Guanghui(余光辉),SHAO Liming(邵立明),et al.Effect of proteins and polysaccharides in sewage sludge on dewaterability[J].Chinese Journal of Environmental Science(环境科学),2008(12):3457-3461.
[26]YANG Demin(杨德敏),YUAN Jianmei(袁建梅),XIA Hong(夏宏).Effect of hydroxyl radical inhibitor on ozonation of phenol[J].Environmental Protection of Chemical Industry(化工环保),2014,34(1):24-27.
[2]LI Lixin(李立欣),ZHAO Qianshen(赵乾身),MA Fang(马放),et al.Status and development trend of sludge reduction technologies in wastewater treatment[J].Technology of Water Treatment(水处理技术),2015(1):1-4.
[3]FENTON H J H.Oxidation of tartaric acid in the presence of iron[J].Journal of the Chemical Society,1894,65:899-910.
[4]HONG Chen(洪晨),XING Yi(邢奕),SI Yanxiao(司艳晓),et al.Influence of Fenton's reagent oxidation on sludge dewaterability[J].Research of Environmental Sciences(环境科学研究),2014,27(6):615-622.
[5]PAN Sheng(潘胜),HUANG Guangtuan(黄光团),TAN Xuejun(谭学军),et al.Improvement of excess sludge dewatering performance with Fenton reagent[J].Water Purification Technology(净水技术),2012,31(3):26-31.
[6]ERDEN G,FILIBELI A.Effects of Fenton pre-treatment on waste activated sludge properties[J].Clean-Soil,Air,Water,2011,39(7):626-632.
[7]KAVITHA V,PALANIVELU K.Destruction of cresols by Fenton oxidation process[J].Water Research,2005,39(13):3062-3072.
[8]TAN Dejun(谭德俊),ZHANG Shenghan(张盛汉),WANG Miling(王密灵),et al.In situ oxidation regeneration of the used activated carbon and its application in tertiary treatment of bioeffiuents of dyestuff-making sewage[J].Journal of Safety and Environment(安全与环境学报),2014,14(1):193-197.
[9]PEREZ M,TORRADES F,DOMENECH X,et al.Fenton and photoFenton oxidation of textile effluents[J].Water Research,2002,36(11):2703-2710.
[10]ZHANG Yangyang(张杨阳),YUAN Chungang(苑春刚),ZHANGYan(张艳),et al.Elemental mercury removal by Fenton-like reaction system[J].Environmental Chemistry(环境化学),2012,31(12):1891-1895.
[11]LIN Guanghui(林光辉),WU Jinhua(吴锦华),LI Ping(李平),et al.Effective degradation of reactive brilliant orange X-GNby heterogeneous Fenton reaction using zero-valent iron and H2O2[J].Chinese Journal of Environmental Engineering(环境工程学报),2013,7(3):913-917.
[12]ZHOU Wuyang(周午阳),ZHANG Chaosheng(张朝升),SUNZhimin(孙志民),et al.Treatment of wastewater containing highconcentration dimethyl phthalate by Fenton oxidation under Cu2+catalysis[J].Chinese Journal of Environmental Engineering(环境工程学报),2014,8(7):2789-2794.
[13]GUO Xingfei(郭幸斐),WANG Yaowu(王姚武),ZHANGHongwei(张宏伟),et al.Study on the degradation of methylene blue by Fenton-like reagent[J].Environmental Science&Technology(环境科学与技术),2016(5):38-41.
[14]WANG Shidong(王士东),YANG Qi(杨琦),WANG Shizong(王诗宗),et al.Comparison between the two extraction methods of extracellular polymers from the aerobic sludge and its adsorption of dye rhodamine B[J].Journal of Safety and Environment(安全与环境学报),2014,14(1):172-176.
[15]DUBOIS M,GILLES K A,HAMILTON J K,et al.Colorimetric method for determination of sugars and related substances[J].Analytical Chemistry,1956,28(3):350-356.
[16]FANG Jingyu(方静雨),MA Zengyi(马增益),YAN Jianhua(严建华),et al.Comparative investigation of parameters for determining the dewaterability of activated sludge[J].Energy Engineerin(能源工程),2011(4):51-53.
[17]LIU Huan(刘欢),YANG Jiakuan(杨家宽),SHI Yafei(时亚飞),et al.Relationship of evaluation indexes of sludge dewatering performance under different conditioning programs[J].Environmental Science(环境科学),2011,32(11):3394-3399.
[18]WANG Lei(王磊),ZHANG Chen(张辰),TAN Xuejun(谭学军),et al.Characteristic indexes of deep dewatering performance of urban sewage sludge[J].Water Purification Technology(净水技术),2017(8):42-45.
[19]LIU Peng(刘鹏),LIU Huan(刘欢),YAO Hong(姚洪),et al.Influence of Fenton's reagent and skeleton builders on sludge dewatering performance[J].Environmental Science&Technology(环境科学与技术),2013(10):146-151.:
[20]WANG Zixin(王子昕),FANG Guixian(方桂仙),CAO Jingfang(曹静芳),et al.Method for improving sedimentation performance of activated sludge[J].Environmental Engineering(环境工程),1987(6):9-13.
[21]LU Wen(鹿雯).The influence of extracellular polymeric substance(EPS)on physical-chemical properties of sludge[J].Environmental Science and Management(环境科学与管理),2007,32(5):27-30.
[22]LIU H,YANG J,ZHU N,et al.A comprehensive insight into the combined effects of Fenton's reagent and skeleton builders on sludge deep dewatering performance[J].Journal of Hazardous Materials,2013,258(258/259C):144-150.
[23]WANG Hongwu(王红武),LI Xiaoyan(李晓岩),ZHAO Qingxiang(赵庆祥),et al.Surface properties of activated sludge and their effects on settlleability and dewaterability[J].Journal of Tsinghua University:Science and Technology(清华大学学报:自然科学版),2004,44(6):766-769.
[24]LI X Y,YANG S F.Influence of loosely bound extracellular polymeric substances(EPS)on the flocculation,sedimentation and dewaterability of activated sludge[J].Water Research,2007,41(5):1022-1030.
[25]HE Peipei(何培培),YU Guanghui(余光辉),SHAO Liming(邵立明),et al.Effect of proteins and polysaccharides in sewage sludge on dewaterability[J].Chinese Journal of Environmental Science(环境科学),2008(12):3457-3461.
[26]YANG Demin(杨德敏),YUAN Jianmei(袁建梅),XIA Hong(夏宏).Effect of hydroxyl radical inhibitor on ozonation of phenol[J].Environmental Protection of Chemical Industry(化工环保),2014,34(1):24-27.