生物沥浸联合类Fenton作用对污泥脱水性能的改善
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摘要
为了解生物沥浸促进下的类Fenton调理对污泥脱水性能的影响,采用序批式恒温培养法,以比阻(SRF)、毛细吸水时间(CST)、过滤时间(TTF)和上清液中胞外聚合物(EPS)组分含量等指标,比较生物沥浸、Fenton氧化以及生物沥浸联合类Fenton氧化3种调理方法对污泥脱水速率和脱水程度的影响,并探讨其调理机制.结果表明,污泥经过生物沥浸联合类Fenton氧化调理后,比阻和毛细吸水时间分别从14.0×10~(12) m/kg和24 s下降到0.178×10~(12) m/kg和7.7 s,脱水性能较单独生物沥浸提高80.0%,与单独Fenton相比提高90.6%.此外,H_2O_2投加量对污泥的脱水效果具有重要影响,在本研究条件下最佳H_2O_2投加量是20 mg/g DS(干物质).因此,生物沥浸联合类Fenton作用可显著改善污泥脱水性能,EPS释放、Fe~(3+)絮凝和大量结合水转化为自由水是促进污泥脱水的主要原因.
To investigate the inf luence of Acidithiobacillus ferrooxidans-based bioleaching combined with a Fenton-like reaction on sludge dewaterability, Fenton oxidation and bioleaching were performed using separate and combined conditioning via batch experiments. Several parameters, such as specific resistance to filtration(SRF), capillary suction time(CST), and the time to filter(TTF), were used to evaluate the dewatering performance. The contents and composition of extracellular polymer substances(EPS) and the sludge particle size were also measured to analyze the possible conditioning mechanism. After bioleaching combined with the Fenton-like reaction, SRF and CST decreased from 14.0 × 10~(12) to 0.178 × 10~(12) m/kg and from 24 to 7.7 s, respectively. The results indicated that the optimal H_2O_2 dosage was 20 mg/g DS(dry substance).Combined conditioning using Fenton oxidation and bioleaching proved to be more effective to improve sludge dewaterability compared with traditional Fenton oxidation or bioleaching conditioning. The dosage of H_2O_2 had a marked influence on sludge dewaterability during conditioning by bioleaching combined with the Fenton-like reaction. In conclusion, a combination of bioleaching and Fenton-like reaction can improve sludge dewaterability, and EPS dissolution, Fe~(3+) coagulation, transformation of bound water into free water may be responsible for improvement of sludge dewaterability.
To investigate the inf luence of Acidithiobacillus ferrooxidans-based bioleaching combined with a Fenton-like reaction on sludge dewaterability, Fenton oxidation and bioleaching were performed using separate and combined conditioning via batch experiments. Several parameters, such as specific resistance to filtration(SRF), capillary suction time(CST), and the time to filter(TTF), were used to evaluate the dewatering performance. The contents and composition of extracellular polymer substances(EPS) and the sludge particle size were also measured to analyze the possible conditioning mechanism. After bioleaching combined with the Fenton-like reaction, SRF and CST decreased from 14.0 × 10~(12) to 0.178 × 10~(12) m/kg and from 24 to 7.7 s, respectively. The results indicated that the optimal H_2O_2 dosage was 20 mg/g DS(dry substance).Combined conditioning using Fenton oxidation and bioleaching proved to be more effective to improve sludge dewaterability compared with traditional Fenton oxidation or bioleaching conditioning. The dosage of H_2O_2 had a marked influence on sludge dewaterability during conditioning by bioleaching combined with the Fenton-like reaction. In conclusion, a combination of bioleaching and Fenton-like reaction can improve sludge dewaterability, and EPS dissolution, Fe~(3+) coagulation, transformation of bound water into free water may be responsible for improvement of sludge dewaterability.
引文
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3 He DQ,Wang LF,Jiang H,Yu HQ.A Fenton-like process for the enhanced activated sludge dewatering[J].Chem Eng J,2015,272:128-134
4 Yu WB,Yang JK,Shi YF,Song J,Shi Y,Xiao J,Li C,Xu XY,He S,Liang S,Wu X,Hu JP.Roles of iron species and p H optimization on sewage sludge conditioning with Fenton’s reagent and lime[J].Water Res,2016,95:124-133
5 宋永伟,刘奋武,周立祥.微生物营养剂浓度对生物沥浸法促进城市污泥脱水性能的影响[J].环境科学,2012,33(8):2786-2792[Song YW,Liu FW,Zhou LX.Effect of microbial nutrient concentration on improvement of municipal sewage sludge dewaterability through bioleaching[J].Environ Sci,2012,33(8):2786-2792]
6 刘奋武,周立祥,周俊,姜峰.生物沥浸处理提高城市污泥脱水性能的中试研究:连续运行模式[J].环境科学,2011,32(10):2023-2029[Liu FW,Zhou LX,Zhou J,Jiang F.Improvement of municipal sewage sludge dewaterability by bioleaching:a pilot-scale study with a continuous plug flow reaction model[J].Environ Sci,2011,32(10):2023-2029]
7 陈泓,宁寻安,罗海健,王玉洁,刘敬勇,杨佐毅,阳重阳.生物淋滤-Fenton对印染污泥脱水性能的影响[J].环境工程学报,2014,8(4):1641-1646[Chen H,Ning XA,Luo HJ,Wang YJ,Liu JY,Yang ZY,Yang CY.Influence of bioleaching-Fenton oxidation on textile dyeing sludge dewatering performances[J].Chin J Environ Eng,2014,8(4):1641-1646]
8 霍敏波,郑冠宇,梁剑茹,周立祥.生物沥浸处理中微生物菌群和胞外聚合物对城市污泥脱水性能的影响[J].环境科学学报,2014,34(9):2199-2204[Huo MB,Zheng GY,Liang JR,Zhou LX.Influence of microbial f lora and extracellular plyometric substances on municipal sewage sludge dewaterability enhanced by bioleaching process[J].Acta Scient Circum,2014,34(9):2199-2204]
9 刘奋武,周立祥.不同能源物质配合及化学强化对生物沥浸法提高城市污泥脱水性能的效果[J].环境科学学报,2009,29(5):974-979[Liu FW,Zhou LX.Enhancing dewaterability of municipal sewage sludge through the combined approaches of bioleaching and Fenton reaction[J].Acta Sci Circum,2009,29(5):974-979]
10 刘昌庚,张盼月,蒋娇娇,曾成华,黄毅,徐国印.生物沥浸耦合类Fenton氧化调理城市污泥[J].环境科学,2015,36(1):333-337[Liu CG,Zhang PY,Jiang JJ,Zeng CH,Huang Y,Xu GY.Sewage sludge conditioning by bioleaching combined with Fenton-like oxidation[J].Environ Sci,2015,36(1):333-337]
11 Huo MB,Zheng GY,Zhou LX.Enhancement of the dewaterability of sludge during bioleaching mainly controlled by microbial quantity change and the decrease of slime extracellular polymeric substances content[J].Bioresour Technol,2014,168(3):190-197
12 Fontmorin JM,Sillanp??M.Bioleaching and combined bioleaching/Fenton-like processes for the treatment of urban anaerobically digested sludge:Removal of heav y metals and improvement of the sludge dewaterability[J].Sep Purif Technol,2015,156:655-664
13 宋兴伟,周立祥.生物沥浸处理对城市污泥脱水性能的影响研究[J].环境科学学报,2008,28(10):2012-2017[Song XW,Zhou LX.The influence of bioleaching on dewaterability of municipal sewage sludge[J].Acta Sci Circum,2008,28(10):2012-2017]
14 Walter WG.St and ard methods for the exam i nat ion of water and wastewater[M].Washington:American Public Health Association,2005
15 Bo F,Palmgren R,Keiding K,Nielsen PH.Extraction of extracellular polymers from activated sludge using a cation exchange resin[J].Water Res,1996,30(8):1749-1758
16 Nielsen PH,Keiding K.Disintegration of activated sludge f locs in presence of sulfide[J].Water Res,1998,32(2):313-320
17 Burton K.A study of the conditions and mechanism of the diphenylamine reaction for the colorimetric estimation of deoxyribonucleic acid[J].Biochem J,1956,62(2):315-323
18 Chen Z,Zhang WJ,Wang DS,Ma T,Bai RY.Enhancement of activated sludge dewatering performance by combined composite enzymatic lysis and chemical re-f locculation with inorganic coagulants:Kinetics of enzymatic reaction and re-flocculation morphology[J].Water Res,2015,83:367-376
19 Novak JT.Dewatering of sewage sludge[J].Drying Technol,2006,24(10):1257-1262
20 Chen YG,Chen YS,Gu GW.Influence of pretreating activated sludge with acid and surfactant prior to conventional conditioning on filtration dewatering[J].Chem Eng J,2004,99(2):137-143
21 R ay naud M,Va xelai re J,Oliv ier J,Dieudéfauvel E,Baudez JC.Compression dewatering of municipal activated sludge:Effects of salt and p H[J].Water Res,2012,46(14):4448-4456
22 Wang LF,Wang LL,Li WW,He DQ,Jiang H,Ye XD,Yuan HP,Zhu NW,Yu HQ.Surfactant-mediated settleability and dewaterability of activated sludge[J].Chem Eng Sci,2014,116(116):228-234
23 Liao Y H,Zhou LX,Bai SY,Liang J R,Wang SM.Occurrence of biogenic schwer tman nite in sludge bioleaching environ ments and its adverse effect on solubilization of sludge-borne metals[J].Appl Geochem,2009,24(9):1739-1746
24 Wang WM,Song J,Han X.Schwer tmannite as a new Fenton-like catalyst in the oxidation of phenol by H2O2[J].J Hazard Mater,2013,262(8):412-419
25 Mikkelsen LH,Keiding K.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Res,2002,36(10):2451-2462
2 周立祥.污泥生物沥浸处理技术及其工程应用[J].南京农业大学学报,2012,35(5):154-166[Zhou LX.Bioleaching role in improving sludge in-deep dewatering and removal of sludge-borne metals and its engineering application[J].J Nanjing Agric Univ,2012,35(5):154-166]
3 He DQ,Wang LF,Jiang H,Yu HQ.A Fenton-like process for the enhanced activated sludge dewatering[J].Chem Eng J,2015,272:128-134
4 Yu WB,Yang JK,Shi YF,Song J,Shi Y,Xiao J,Li C,Xu XY,He S,Liang S,Wu X,Hu JP.Roles of iron species and p H optimization on sewage sludge conditioning with Fenton’s reagent and lime[J].Water Res,2016,95:124-133
5 宋永伟,刘奋武,周立祥.微生物营养剂浓度对生物沥浸法促进城市污泥脱水性能的影响[J].环境科学,2012,33(8):2786-2792[Song YW,Liu FW,Zhou LX.Effect of microbial nutrient concentration on improvement of municipal sewage sludge dewaterability through bioleaching[J].Environ Sci,2012,33(8):2786-2792]
6 刘奋武,周立祥,周俊,姜峰.生物沥浸处理提高城市污泥脱水性能的中试研究:连续运行模式[J].环境科学,2011,32(10):2023-2029[Liu FW,Zhou LX,Zhou J,Jiang F.Improvement of municipal sewage sludge dewaterability by bioleaching:a pilot-scale study with a continuous plug flow reaction model[J].Environ Sci,2011,32(10):2023-2029]
7 陈泓,宁寻安,罗海健,王玉洁,刘敬勇,杨佐毅,阳重阳.生物淋滤-Fenton对印染污泥脱水性能的影响[J].环境工程学报,2014,8(4):1641-1646[Chen H,Ning XA,Luo HJ,Wang YJ,Liu JY,Yang ZY,Yang CY.Influence of bioleaching-Fenton oxidation on textile dyeing sludge dewatering performances[J].Chin J Environ Eng,2014,8(4):1641-1646]
8 霍敏波,郑冠宇,梁剑茹,周立祥.生物沥浸处理中微生物菌群和胞外聚合物对城市污泥脱水性能的影响[J].环境科学学报,2014,34(9):2199-2204[Huo MB,Zheng GY,Liang JR,Zhou LX.Influence of microbial f lora and extracellular plyometric substances on municipal sewage sludge dewaterability enhanced by bioleaching process[J].Acta Scient Circum,2014,34(9):2199-2204]
9 刘奋武,周立祥.不同能源物质配合及化学强化对生物沥浸法提高城市污泥脱水性能的效果[J].环境科学学报,2009,29(5):974-979[Liu FW,Zhou LX.Enhancing dewaterability of municipal sewage sludge through the combined approaches of bioleaching and Fenton reaction[J].Acta Sci Circum,2009,29(5):974-979]
10 刘昌庚,张盼月,蒋娇娇,曾成华,黄毅,徐国印.生物沥浸耦合类Fenton氧化调理城市污泥[J].环境科学,2015,36(1):333-337[Liu CG,Zhang PY,Jiang JJ,Zeng CH,Huang Y,Xu GY.Sewage sludge conditioning by bioleaching combined with Fenton-like oxidation[J].Environ Sci,2015,36(1):333-337]
11 Huo MB,Zheng GY,Zhou LX.Enhancement of the dewaterability of sludge during bioleaching mainly controlled by microbial quantity change and the decrease of slime extracellular polymeric substances content[J].Bioresour Technol,2014,168(3):190-197
12 Fontmorin JM,Sillanp??M.Bioleaching and combined bioleaching/Fenton-like processes for the treatment of urban anaerobically digested sludge:Removal of heav y metals and improvement of the sludge dewaterability[J].Sep Purif Technol,2015,156:655-664
13 宋兴伟,周立祥.生物沥浸处理对城市污泥脱水性能的影响研究[J].环境科学学报,2008,28(10):2012-2017[Song XW,Zhou LX.The influence of bioleaching on dewaterability of municipal sewage sludge[J].Acta Sci Circum,2008,28(10):2012-2017]
14 Walter WG.St and ard methods for the exam i nat ion of water and wastewater[M].Washington:American Public Health Association,2005
15 Bo F,Palmgren R,Keiding K,Nielsen PH.Extraction of extracellular polymers from activated sludge using a cation exchange resin[J].Water Res,1996,30(8):1749-1758
16 Nielsen PH,Keiding K.Disintegration of activated sludge f locs in presence of sulfide[J].Water Res,1998,32(2):313-320
17 Burton K.A study of the conditions and mechanism of the diphenylamine reaction for the colorimetric estimation of deoxyribonucleic acid[J].Biochem J,1956,62(2):315-323
18 Chen Z,Zhang WJ,Wang DS,Ma T,Bai RY.Enhancement of activated sludge dewatering performance by combined composite enzymatic lysis and chemical re-f locculation with inorganic coagulants:Kinetics of enzymatic reaction and re-flocculation morphology[J].Water Res,2015,83:367-376
19 Novak JT.Dewatering of sewage sludge[J].Drying Technol,2006,24(10):1257-1262
20 Chen YG,Chen YS,Gu GW.Influence of pretreating activated sludge with acid and surfactant prior to conventional conditioning on filtration dewatering[J].Chem Eng J,2004,99(2):137-143
21 R ay naud M,Va xelai re J,Oliv ier J,Dieudéfauvel E,Baudez JC.Compression dewatering of municipal activated sludge:Effects of salt and p H[J].Water Res,2012,46(14):4448-4456
22 Wang LF,Wang LL,Li WW,He DQ,Jiang H,Ye XD,Yuan HP,Zhu NW,Yu HQ.Surfactant-mediated settleability and dewaterability of activated sludge[J].Chem Eng Sci,2014,116(116):228-234
23 Liao Y H,Zhou LX,Bai SY,Liang J R,Wang SM.Occurrence of biogenic schwer tman nite in sludge bioleaching environ ments and its adverse effect on solubilization of sludge-borne metals[J].Appl Geochem,2009,24(9):1739-1746
24 Wang WM,Song J,Han X.Schwer tmannite as a new Fenton-like catalyst in the oxidation of phenol by H2O2[J].J Hazard Mater,2013,262(8):412-419
25 Mikkelsen LH,Keiding K.Physico-chemical characteristics of full scale sewage sludges with implications to dewatering[J].Water Res,2002,36(10):2451-2462