不同预处理方法对脱水污泥厌氧消化的影响
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摘要
以城市污水厂脱水污泥为对象,研究不同预处理方法(低温水热、HCl、H_2O_2、HCl+低温水热、H_2O_2+低温水热、HCl+低温水热+HAc、H_2O_2+低温水热+HAc)对污泥可溶化率和后续厌氧消化产气的影响。实验结果表明,HCl添加量越大,p H越低;H_2O_2添加量越大,污泥可溶化效果越好。H_2O_2+低温水热+HAc可溶化效果最为显著,经预处理后溶解性化学需氧量(soluble chemical oxygen demand,SCOD)是原泥的13.4倍,溶解性碳水化合物为原泥的4.1倍。可溶化效果与预处理方式均对挥发性脂肪酸(volatile fatty acids,VFA)有影响。预处理条件为HCl+低温水热或H_2O_2+低温水热时,污泥自身VFA含量有较大幅度增加。生物化学甲烷势(biochemical methane potential,BMP)实验显示,甲烷产率提高与产气高峰提前呈正相关;添加HAc可有效提高微生物对污泥的代谢,有利于甲烷产率的提高。预处理条件为H_2O_2+低温水热+HAc时的甲烷产率最大,比原泥甲烷产率提高了57.63%,优于已有研究成果。
The influence of different pretreatments(low temperature hydrothermal, HCl, H_2O_2, HCl+low temperature hydrothermal, H_2O_2+low temperature hydrothermal, HCl+low temperature hydrothermal+HAc, H_2O_2+low temperature hydrothermal+HAc) on the sludge dissolubility and methane production during the anaerobic digestion process of the dewatered sludge were investigated. The results showed that higher HCl solution addition with the lower p H, or the higher H_2O_2 addition leads to the higher sludge dissolubility. The sludge dissolubility under the pretreatment condition of H_2O_2+low temperature hydrothermal+HAc was the highest, while the soluble chemical oxygen demand(SCOD) under this pretreatment condition was 13.4 times than that of the original sludge, and the soluble carbohydrate was 4.15 times than that of the original sludge. Under the pretreatments of both HCl+low temperature hydrothermal and H_2O_2+low temperature hydrothermal, the VFA concentration of the sludge was significantly increased. The biochemical methane potential(BMP) experimental results showed that the increase of the methane yield rate was positively correlated with the earlier shift of the gas production peak. The addition of HAc can effectively improve the microbial metabolism of sludge and increase the methane yield. The methane yield rate under the pretreatment condition of H_2O_2+low temperature hydrothermal+HAc was about 57.63% higher than that of the original sludge not pretreated.
The influence of different pretreatments(low temperature hydrothermal, HCl, H_2O_2, HCl+low temperature hydrothermal, H_2O_2+low temperature hydrothermal, HCl+low temperature hydrothermal+HAc, H_2O_2+low temperature hydrothermal+HAc) on the sludge dissolubility and methane production during the anaerobic digestion process of the dewatered sludge were investigated. The results showed that higher HCl solution addition with the lower p H, or the higher H_2O_2 addition leads to the higher sludge dissolubility. The sludge dissolubility under the pretreatment condition of H_2O_2+low temperature hydrothermal+HAc was the highest, while the soluble chemical oxygen demand(SCOD) under this pretreatment condition was 13.4 times than that of the original sludge, and the soluble carbohydrate was 4.15 times than that of the original sludge. Under the pretreatments of both HCl+low temperature hydrothermal and H_2O_2+low temperature hydrothermal, the VFA concentration of the sludge was significantly increased. The biochemical methane potential(BMP) experimental results showed that the increase of the methane yield rate was positively correlated with the earlier shift of the gas production peak. The addition of HAc can effectively improve the microbial metabolism of sludge and increase the methane yield. The methane yield rate under the pretreatment condition of H_2O_2+low temperature hydrothermal+HAc was about 57.63% higher than that of the original sludge not pretreated.
引文
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[19] MABELLEIRAPEREIRA J, IPEREZELVIRA S, SANCHEZONETO J, et al. Enhancement of methane production in mesophilic anaerobic digestion of secondary sewage sludge by advanced thermal hydrolysis pretreatment[J]. Water Research,2015,71:330-340. DOI:10.1016/j.watres.2014.12.027.
[20]任南琪,王爱杰.厌氧生物技术原理与应用[M].北京:化学工业出版社,2004:14-22.
[2] MANSOUR A P, MOHAMMADALI E N, MEHDI K, et al. Mesophilic co-digestion of municipal solid waste and sewage sludge:Effect of mixing ratio,total solids, and alkaline pretreatment[J]. International Biodeterioration&Biodegradation,2017,125:97-104.DOI:10.1016/j.ibiod.2017.09.004.
[3] APPELS L, BAEYENS J, DEGREVE J, et al. Principles and potential of the anaerobic digestion of waste-activated sludge[J].Progress in Energy and Combustion Science,2008,34(6):755-781. DOI:10.1016/j.pecs.2008.06.002.
[4] SUSCHKA J, GRUBEL K. Low intensity surplus activated sludge pretreatment before anaerobic digestion[J]. Archives of Environmental Protection,2017,43(4):50-57. DOI:10.1515/aep-2017-0038.
[5]肖本益,刘俊新.不同预处理方法对剩余污泥性质的影响研究[J].环境科学,2008,29(2):327-331. DOI:10.3321/j.issn:0250-3301.2008.02.010.
[6]王治军,王伟.水热预处理改善污泥的厌氧消化性能[J].环境科学,2005,26(1):68-71.
[7] JIANG H, LIU T, DING J T, et al. Optimization and performance of moderate combined alkali and microwave pretreatment for anaerobic digestion of waste-activated sludge[J]. Polish Journal of Environmental Studies,2018,27(2):689-697. DOI:10.15244/pjoes/76138.
[8] MRUIZ H, JMARTIN D, JLABAND A, et al. Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential[J]. Water Research,2014,61:119-129. DOI:10.1016/j.watres.2014.05.012.
[9] ZHANG T T. Combined free nitrous acid and hydrogen peroxide pre-treatment of waste activated sludge enhances methane production via organic molecule breakdown[EB/OL].[2018-02-27]. https://www.nature.com/articles/srep16631, 2015.
[10]严媛媛,陈汉龙,何群彪,等.热碱预处理改善低有机质污泥厌氧消化性能的效果[J].中国给水排水,2012,28(23):9-17. DOI:10.3969/j.issn.1000-4602.2012.23.003.
[11]姚一思.基于水热预处理的污泥高温厌氧消化技术的研究[D].南京:东南大学,2016.
[12] SEYONG P, MOONIL K. Innovative ammonia stripping with an electrolyzed water system as pretreatment of thermally hydrolyzed wasted sludge for anaerobic digestion[J]. Water Research,2015,68:580-588. DOI:10.1016/j.watres.2014.10.033.
[13] PELLERA F M, SANTORI S, POMI R. Effect of alkaline pretreatment on anaerobic digestion of olive mill solid waste[J]. Waste Management,2016,58:160-168. DOI:10.1016/j.wasman.2016.08.008.
[14] XUE Y G, LIU H J, CHEN S S, et al. Effects of thermal hydrolysis on organic matter solubilization and anaerobic digestion of high solid sludge[J]. Chemical Engineering Journal,2015,264:174-180. DOI:10.1016/j.cej.2014.11.005.
[15] CHEN Y, JIANG S, YUAN H, et al. Hydrolysis and acidification of waste activated sludge at different p Hs[J]. Water Research,2007,41(3):683-689. DOI:10.1016/j.watres.2006.07.030.
[16] DEWIL R, APPELS L, BAEYENS J, et al. Peroxidation enhances the biogas production in the anaerobic digestion of biosolids[J].Journal of Hazardous Materials,2007,146(3):577-581. DOI:10.1016/j.jhazmat.2007.04.059.
[17] SUN H, WU S B, DONG R J. Monitoring volatile fatty acids and carbonate alkalinity in anaerobic digestion:Titration methodologies[J].Chemical Engineering Technology,2016,39(4):599-610. DOI:10.1002/ceat.201500293.
[18] DEVLIN D C, ESTEVES S R R, DINSDALE R M, et al. The effect of acid pretreatment on the anaerobic digestion and dewatering of waste activated sludge[J]. Bioresource Technology,2011,102:4076-4082. DOI:10.1016/j.biortech.2010.12.043.
[19] MABELLEIRAPEREIRA J, IPEREZELVIRA S, SANCHEZONETO J, et al. Enhancement of methane production in mesophilic anaerobic digestion of secondary sewage sludge by advanced thermal hydrolysis pretreatment[J]. Water Research,2015,71:330-340. DOI:10.1016/j.watres.2014.12.027.
[20]任南琪,王爱杰.厌氧生物技术原理与应用[M].北京:化学工业出版社,2004:14-22.