碱解+低温水热预处理改善剩余污泥中温厌氧消化性能工艺
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摘要
以城市污水厂剩余活性污泥为对象,研究在不同碱解药剂和剂量以及不同水热预处理温度和水热时间下"碱解+低温水热预处理"的破胞效果。通过对预处理泥样进行中温((35±1)℃)厌氧消化生物化学甲烷势(biochemical methane potential,BMP)实验来评价该预处理工艺对中温厌氧消化性能的影响。实验结果表明,SCOD的溶出效果及VSS的减量化程度随着加碱剂量、水热温度的增加而呈现先升高后略有下降的趋势,且在碱解条件为0.05 g NaOH/g TS和水热条件为70℃、9 h时的预处理条件下破胞效果最为显著;在该预处理条件下,SCOD的溶出率可达52.3%,VSS的降解率达到33.3%。BMP实验结果显示,在最佳预处理条件下,与对照组相比,TCOD去除率提高了77.1%,甲烷产气量是对照组的2.7倍,甲烷产气率可达354 mL CH4/g VS。
Disintegration of the waste activated sludge( WAS) of a municipal wastewater treatment plant using alkaline-low temperature thermal pretreatment with different kinds and doses of alkaline at a series of pretreatment temperatures and thermal reaction times were investigated. The effect of alkaline-thermal pretreatment on anaerobic digestion was investigated by mesophilic(( 35 ± 1) ℃) biochemical methane potential( BMP) test.The results showed that the SCOD release efficiency and the VSS reduction efficiency increased and then decreased with increased alkaline dose and thermal temperature. The optimal pretreatment conditions were 0. 05 g NaOH /g TS at 70℃ for 9 h. Under the conditions,the SCOD release efficiency was 52. 3%,the VSS reduction efficiency reached 33. 3%. The BMP experiment results showed that the TCOD removal efficiency increased to77. 1%,which was significantly higher than the control group. While,the methane production was 2. 7 times as many as the control group. The biogas production rate was 354 mL CH4/g VS under the optimal pretreatment conditions.
Disintegration of the waste activated sludge( WAS) of a municipal wastewater treatment plant using alkaline-low temperature thermal pretreatment with different kinds and doses of alkaline at a series of pretreatment temperatures and thermal reaction times were investigated. The effect of alkaline-thermal pretreatment on anaerobic digestion was investigated by mesophilic(( 35 ± 1) ℃) biochemical methane potential( BMP) test.The results showed that the SCOD release efficiency and the VSS reduction efficiency increased and then decreased with increased alkaline dose and thermal temperature. The optimal pretreatment conditions were 0. 05 g NaOH /g TS at 70℃ for 9 h. Under the conditions,the SCOD release efficiency was 52. 3%,the VSS reduction efficiency reached 33. 3%. The BMP experiment results showed that the TCOD removal efficiency increased to77. 1%,which was significantly higher than the control group. While,the methane production was 2. 7 times as many as the control group. The biogas production rate was 354 mL CH4/g VS under the optimal pretreatment conditions.
引文
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[21]Tanaka S.,Kobayashi T.,Kamiyama K.I.,et al.Effects of thermochemical pretreatment on the anaerobic digestion of waste activated sludge.Water Science and Technology,1997,35(8):209-215
[2]Appels L.,Baeyens J.,Degrève J.,et al.Principles and potential of the anaerobic digestion of waste-activated sludge.Prog.Energy Combust.Science,2008,34(6):755-781
[3]Tiehm A.,Nickel K.,Zeuhorn M.,et al.Ultrasonic waste activated sludge disintegration for improving anaerobic stabilization.Water Research,2001,35(8):2003-2009
[4]Uma Rani R.,Adish Kumar S.,Kaliappan S.Low temperature therm-chemical pretreatment of dairy waste activated sludge for anaerobic digestion process.Bioresource Technolog,2012,103(1):415-424
[5]Valo A.,Carrere H.,Delgenes J.P.Thermal-chemical and thermochemical pre-treatment of waste activated sludge for anaerobic digeation.J.Chem.Technol.Biotechnol.,2004,79(11):1197-1203
[6]Jeongsik K.,Chulhwan P.,Tak-hyun K.,et al.Effects of various pretreatments for enhanced anaerobic digestion with waste activated sludge.Journal of Bioengineering,2003,95(3):271-275
[7]Vlyssides A.G.,Karlis P.K.Thermal-alkaline solubilization of waste activated sludge as a pre-treatment stage for anaerobic digestion.Bioresource Technology,2004,91(2):201-206
[8]Lin J.G.,Chang C.N.,Chang S.C.Enhancement of anaerobic digestion of waste activated sludge by alkaline solubilization.Bioresource Technol.,1997,62(3):85-90
[9]郑镇,刘彬,虞旭.碱-热法预处理改善污泥厌氧消化性能的实验研究.水资源与水工程学报,2011,22(3):110-112Zheng Zhen,Liu Bin,Yu Xu.Enhancement of sewage sludge anaerobic digestibility by pretreatment of alkalinethermal methods.Journal of Water Resources&Water Engineering,2011,22(3):110-112(in Chinese)
[10]Sponza Delia,Teresa.Extracellular polymer substances and properties of floes in steady and unsteady state activated sludge systems.Process Biochemistry,2002,37(9):983-998
[11]Tatsuya Sawasaki,Yoshinori Hasegawa,Masateru Tsuchimoehi,et al.A bilayer cell-flee protein synthesis system for high throughput screening of geneproducts.Federation of European Biochemical Societies Letters,2002,14(1):102-105
[12]国家环境保护总局.水和废水监测分析方法(第4版).北京:中国环境科学出版社,2002
[13]Tan R.,Miyanaga K.,Toyama K.,et al.Changes in composition and microbial communities in excess sludge after heat-alkaline treatment and acclimation.Biochemical Engineering Journal,2010,5(3):151-159
[14]Wang Q.H.,Kuninobu M.,Ogawa H.I.,et al.Degradation of volatile fatty acids in highly efficient anaerobic digestion.Biomass.Bioenerg.,1999,16(9):407-416
[15]Hema Rughoonundun,Cesar Granda,Romeela Mohee,et al.Effect of thermochemical pretreatment on sewage sludge and its impact on carboxylic acids production.Waste Management,2010,30(8-9):1614-1621
[16]Bougrier C.,Delgenès J.P.,Carrère H.Impacts of thermal pre-treatments on the semi-continuous anaerobic digestion of waste activated sludge.Biochemical Engineering Journal,2007,34(1):20-27
[17]Eskicioglu C.,Kennedy K.J.,Droste R.L.Characterization of soluble organic matter of waste activated sludge before and after thermal pretreatment.Water Research,2006,40(20):3725-3736
[18]何品晶,顾国维,李笃中,等.城市污泥处理与利用.北京:科学出版社,2003
[19]Yang J.,Ji M.,Han Y.,et al.Effect of alkaline pretreatment on sludge disintegration and reduction.China Water&Wastewater,2007,23(23):93-96
[20]严媛媛,陈汉龙,何群彪,等.碱热预处理改善低有机污泥厌氧消化性能的果.中国给水排水,2012,28(23):9-17Yan Yuanyuan,Chen Hanlong,He Qunbiao,et al.Effect of Thermal-alkaline pretreatment on anaerobic digestion of sludge with low organic content.China Water&Wastewater,2012,28(23):9-17(in Chinese)
[21]Tanaka S.,Kobayashi T.,Kamiyama K.I.,et al.Effects of thermochemical pretreatment on the anaerobic digestion of waste activated sludge.Water Science and Technology,1997,35(8):209-215