污泥湿式氧化试验研究及经济性分析
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摘要
为优选污泥湿式氧化处理的反应条件并考察反应效果,在反应釜试验装置上通过正交试验研究了温度、过量空气系数和停留时间等因素对处理效果的影响;对产物中的固、液、气三相分别展开了热重分析、元素分析、化学需氧量测试和气体成分分析,并对固相和液相产物中重金属的质量分数进行了分析.结果表明:在优选条件下,污泥的有机质分解率可达90%以上;固相产物残渣的热失重率小于10%,液相产物有一定的化学需氧量,可返回市政污水处理厂进行处理;气相产物无SO_2和NO_x;重金属富集于残渣中;初步经济性分析发现,污泥湿式氧化的综合处理成本约为130元/t.
To optimize the reaction conditions for hydrothermal oxidation of sewage sludge,and to investigate the reaction results,orthogonal experiments were conducted in a reaction vessel to study the effects of following factors on the treatment results,such as the temperature,excess air ratio and residence time,etc.Meanwhile,the solid,liquid and gas products were analyzed by thermogravimetric,elemental,COD and gas composition analysis,and the heavy metals contained in liquid and solid products were also measured.Results indicate that under optimized reaction conditions,the decomposition rate of oganic matters in the sewage sludge may reach more than 90%;the weight loss of solid residuals is less than 10%;a certain amount of COD is contained in the liquid products,which can be recovered by municipal sewage treatment;no SO_2 or NO_x could be detected in the exhaust gas;heavy metals are concentrated in the solid residuals.Based on techno-economic analysis,the composite cost of sewage sludge hydrothermal oxidation is found to be 130 RMB/t.
To optimize the reaction conditions for hydrothermal oxidation of sewage sludge,and to investigate the reaction results,orthogonal experiments were conducted in a reaction vessel to study the effects of following factors on the treatment results,such as the temperature,excess air ratio and residence time,etc.Meanwhile,the solid,liquid and gas products were analyzed by thermogravimetric,elemental,COD and gas composition analysis,and the heavy metals contained in liquid and solid products were also measured.Results indicate that under optimized reaction conditions,the decomposition rate of oganic matters in the sewage sludge may reach more than 90%;the weight loss of solid residuals is less than 10%;a certain amount of COD is contained in the liquid products,which can be recovered by municipal sewage treatment;no SO_2 or NO_x could be detected in the exhaust gas;heavy metals are concentrated in the solid residuals.Based on techno-economic analysis,the composite cost of sewage sludge hydrothermal oxidation is found to be 130 RMB/t.
引文
[1]郭昉.我国城镇污水处理厂节能降耗研究现状及发展趋势分析[EB/OL].(2017-06-20)[2017-10-20].http://www.h2o-china.com/news/259778.html.
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[9]李本高,孙友,张超.生化剩余污泥湿式氧化减量机理研究[J].石油炼制与化工,2014,45(9):85-89.LI Bengao,SUN You,ZHANG Chao.Mechanism of biochemical excess sludge reduction by wet air oxidation[J].Petroleum Processing and Petrochemicals,2014,45(9):85-89.
[10]陶明涛,张华.污泥水热处理技术及其工程应用[J].北方环境,2012,25(3):211-214.TAO Mingtao,ZHANG Hua.Sludge hydrothermal treatment technologies and their engineering applications[J].Inner Mongolia Environmental Protection,2012,25(3):211-214.
[11]徐岩.湿式氧化法在处理城市污泥中的应用[D].大连:辽宁师范大学,2014.
[2]王美清,郁鸿凌,陈梦洁,等.城市污水污泥热解和燃烧的实验研究[J].上海理工大学学报,2014,36(2):185-188.WANG Meiqing,YU Hongling,CHEN Mengjie,et al.Experimental study on the pyrolysis and combustion of municipal sewage sludge[J].Journal of University of Shanghai for Science and Technology,2014,36(2):185-188.
[3]盛洪产,何国宾,金孝祥,等.循环流化床燃煤锅炉掺烧造纸污泥的运行特性分析[J].动力工程学报,2013,33(5):340-345.SHENG Hongchan,HE Guobin,JIN Xiaoxiang,et al.Operational characteristic analysis on CFB coalfired boiler with co-combustion of paper sludge[J].Journal of Chinese Society of Power Engineering,2013,33(5):340-345.
[4]HII K,BAROUTIAN S,PARTHASARATHY R,et al.A review of wet air oxidation and thermal hydrolysis technologies in sludge treatment[J].Bioresource Technology,2014,155:289-299.
[5]BERTANZA G,CANATO M,HEIMERSSON S,et al.Techno-economic and environmental assessment of sewage sludge wet oxidation[J].Environmental Science and Pollution Research,2015,22(10):7327-7338.
[6]DEBELLEFONTAINE H,FOUSSARD J N.Wet air oxidation for the treatment of industrial wastes.Chemical aspects,reactor design and industrial applications in Europe[J].Waste Management,2000,20(1):15-25.
[7]LUCK F.Wet air oxidation:past,present and future[J].Catalysis Today,1999,53(1):81-91.
[8]CHAUZY J,MARTIN J C,CRETENOT D,et al.Wet air oxidation of municipal sludge:return experience of the north brussels waste water treatment plant[J].Water Practice&Technology,2010,5(1):1-8.
[9]李本高,孙友,张超.生化剩余污泥湿式氧化减量机理研究[J].石油炼制与化工,2014,45(9):85-89.LI Bengao,SUN You,ZHANG Chao.Mechanism of biochemical excess sludge reduction by wet air oxidation[J].Petroleum Processing and Petrochemicals,2014,45(9):85-89.
[10]陶明涛,张华.污泥水热处理技术及其工程应用[J].北方环境,2012,25(3):211-214.TAO Mingtao,ZHANG Hua.Sludge hydrothermal treatment technologies and their engineering applications[J].Inner Mongolia Environmental Protection,2012,25(3):211-214.
[11]徐岩.湿式氧化法在处理城市污泥中的应用[D].大连:辽宁师范大学,2014.