一种基于电芬顿的污泥强化脱水预处理技术研究
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摘要
采用电芬顿技术对抚顺市某市政污水处理厂浓缩池剩余污泥进行预处理,强化污泥的脱水性能。通过正交试验分析了电芬顿污泥强化脱水预处理技术的主要操作参数,确定了最佳工作条件,即p H值为3,曝气量为500 m L/min,电压梯度为2 V/cm;并通过极差与方差分析得出p H值为影响污泥脱水性能的主要参数。通过污泥含水率与脱水速率随时间的变化情况,分析得出最佳的电芬顿氧化处理时间为60 min,此时含水率能够降到68%。通过研究添加羟基自由基(·OH)清除剂后污泥的破坏效果以及·OH浓度与污泥破坏程度的关系,发现电芬顿污泥脱水的关键是产生的强氧化剂中间产物·OH。此外,污泥胞外聚合物(EPS)的浓度和组成在电芬顿氧化反应前后发生变化,紧密结合EPS(TB-EPS)量减少,可溶解性EPS(S-EPS)先增加后减少。
An electro-Fenton( EF) pretreatment technology was used to enhance the dewatering of the excess sludge from a sewage treatment plant in Fushun. The operation parameters in the EF process were analyzed by changing the moisture content and specific resistance of sludge( SRF). The results indicated that the optimized condition was p H of 3,aeration of 500 m L/min,and voltage gradient of 2 V/cm. p H demonstrated a significant influence on the dewatering of sludge in the range and variance analysis. The moisture content reached up to 68% at the optimized condition of 60 minutes oxidation treatment. The hydroxyl radical( ·OH) was identified as a key factor in the sludge dewatering process. Additionally,the concentrations and the compositions of the extracellular polymeric substance( EPS) were changing during the EF process. The concentrations of tightly bound EPS( TB-EPS) were decreasing,while the soluble EPS( S-EPS) concentrations were initially increasing and subsequently decreasing.
An electro-Fenton( EF) pretreatment technology was used to enhance the dewatering of the excess sludge from a sewage treatment plant in Fushun. The operation parameters in the EF process were analyzed by changing the moisture content and specific resistance of sludge( SRF). The results indicated that the optimized condition was p H of 3,aeration of 500 m L/min,and voltage gradient of 2 V/cm. p H demonstrated a significant influence on the dewatering of sludge in the range and variance analysis. The moisture content reached up to 68% at the optimized condition of 60 minutes oxidation treatment. The hydroxyl radical( ·OH) was identified as a key factor in the sludge dewatering process. Additionally,the concentrations and the compositions of the extracellular polymeric substance( EPS) were changing during the EF process. The concentrations of tightly bound EPS( TB-EPS) were decreasing,while the soluble EPS( S-EPS) concentrations were initially increasing and subsequently decreasing.
引文
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[2]Neyens E,Baeyens J,Dewil R,et al.Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering[J].J Hazard Mater,2004,106(2/3):83-92.
[3]Ruiz-Hernando M,Cabanillas E,Labanda J,et al.Ultrasound,thermal and alkali treatments affect extracellular polymeric substances(EPSs)and improve waste activated sludge dewatering[J].Process Biochem,2015,50(3):438-446.
[4]He D Q,Wang L F,Jiang H,et al.A Fenton-like process for the enhanced activated sludge dewatering[J].Chem Eng J,2015,272:128-134.
[5]Yu R F,Lin C H,Chen H W,et al.Possible control approaches of the electro-Fenton process for textile wastewater treatment using on-line monitoring of DO and ORP[J].Chem Eng J,2013,218:341-349.
[6]Murati M,Oturan N,Aaron J J,et al.Degradation and mineralization of sulcotrione and mesotrione in aqueous medium by the electro-Fenton process:a kinetic study[J].Environ Sci Pollut Res,2012,19(5):1563-1573.
[7]邱珊,陈聪,邓凤霞,等.泡沫镍作阴极板的E-Fenton法处理Rh B染料废水[J].中国给水排水,2016,32(9):90-94.
[8]Xu W,Guo S,Li G,et al.Combination of the direct electro-Fenton process and bioremediation for the treatment of pyrene-contaminated soil in a slurry reactor[J].Front Environ Sci Eng,2015,9(6):1096-1107.
[9]Xu Q,Wang H J,Wang Y.Characterization of the structure and interaction of sludge biosolids during the conditioning—electro-dewatering process[J].Colloids Surf A:Physicochem,2015,484:108-117.
[10]Rosales E,Pazos M,Sanromán M A.Advances in the electro-Fenton process for remediation of recalcitrant organic compounds[J].Chem Eng Technol,2012,35(4):609-617.
[11]Wang A M,Li Y Y,Ru J.The mechanism and application of the electro-Fenton process for azo dye Acid Red14 degradation using an activated carbon fibre felt cathode[J].J Chem Technol Biotechnol,2010,85(11):1463-1470.
[12]Arienzo M.Use of abiotic oxidative-reductive technologies for remediation of munition contaminated soil in a bioslurry reactor[J].Chemosphere,2000,40(4):441-448.
[13]Harimurti S,Dutta B K,Ariff I,et al.Degradation of monoethanolamine in aqueous solution by Fenton’s reagent with biological post-treatment[J].Water Air and Soil Pollution,2010,211(1/4):273-286.
[14]Martinez N S,Fernandez J F,Segura X F,et al.Pre-oxidation of an extremely polluted industrial wastewater by the Fenton’s reagent[J].J Hazard Mater,2003,101(3):315-322.
[15]de Luna M D,Veciana M L,Su C C,et al.Acetaminophen degradation by electro-Fenton and photoelectroFenton using a double cathode electrochemical cell[J].J Hazard Mater,2012,217/218(3):200-207.
[16]Flotron V,Delteil C,Padellec Y,et al.Removal of sorbed polycyclic aromatic hydrocarbons from soil,sludge and sediment samples using the Fenton’s reagent process[J].Chemosphere,2005,59(10):1427-1437.