基于连续式热态实验平台的污泥湿式氧化实验
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摘要
为了验证污泥湿式氧化技术的工业可行性、稳定性和安全性,通过建立连续式热态实验台研究典型条件下的污泥湿式处理效果,分别检测了氧化产物中的三相成分和性质并进行反应动力学计算。结果表明:典型条件下实验装置稳定运行超过100 h,反应后固相残渣有机物降解率达78.62%,重金属含量及浸出重金属含量均达标;液相中COD、总氮、氨氮和总磷超标,可返回污水处理厂进一步处理;气相中无SO_2和NO_x;污泥湿式氧化过程分为快速反应阶段和慢速反应阶段,且2个阶段均属于化学动力学控制。
To verify the industrial feasibility, robustness and safety of a sludge wet air oxidation(WAO) process, a continuous hot test bed was built to research the sludge wet treatment effectiveness under typical conditions, including analyzing the compositions and properties of the reaction products in solid, liquid and gas phase, and conducting kinetic calculations for relevant reaction processes. Results show that the test bed is able to run steadily for more than 100 h under typical reaction conditions, and the degradation rate of organic matters in solid phase reaches 78.62%. The contents of original and leached heavy metal in residue meet relevant emission standards. In liquid phase, the COD, ammonia state nitrogen, total nitrogen and total phosphor are out of specifications, which need to be retreated in related waste water treatment plants. No SO_2 or NO_x is detected in the exhaust gas. The sludge WAO process includes the fast-reaction phase and slow-reaction phase, both of which are under the control of chemical reaction kinetics.
To verify the industrial feasibility, robustness and safety of a sludge wet air oxidation(WAO) process, a continuous hot test bed was built to research the sludge wet treatment effectiveness under typical conditions, including analyzing the compositions and properties of the reaction products in solid, liquid and gas phase, and conducting kinetic calculations for relevant reaction processes. Results show that the test bed is able to run steadily for more than 100 h under typical reaction conditions, and the degradation rate of organic matters in solid phase reaches 78.62%. The contents of original and leached heavy metal in residue meet relevant emission standards. In liquid phase, the COD, ammonia state nitrogen, total nitrogen and total phosphor are out of specifications, which need to be retreated in related waste water treatment plants. No SO_2 or NO_x is detected in the exhaust gas. The sludge WAO process includes the fast-reaction phase and slow-reaction phase, both of which are under the control of chemical reaction kinetics.
引文
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[23] BERTANIA G,GALESSI R,MENONI L,et al.Wet oxidation of sewage sludge:full-scale experience and process modeling [J].Environmental Science and Pollution Research,2015,22(10):7306-7316.
[2] 邹宝华,王宏斌.污水污泥处理处置现状及研究进展[J].价值工程,2012(13):30-31.ZOU Baohua,WANG Hongbin.Present situation and progress of sewage sludge treatment and disposal[J].Value Engineering,2012(13):30-31.
[3] 何荧.城镇污水厂剩余污泥的处理与处置[J].价值工程,2013(6):297-298.HE Ying.The treatment and disposal of remaining sludge of urban sewage treatment plant[J].Value Engineering,2013(6):297-298.
[4] 娄俊峰.浅谈污泥处理技术[J].能源与节能,2014(5):103-104.LOU Junfeng.On the sludge treatment technologies[J].Energy and Conservation,2014(5):103-104.
[5] 庄修政,黄艳琴,阴秀丽,等.污泥水热处理制备清洁燃料的研究进展[J].化工进展,2018,37(1):311-318.ZHUANG Xiuzheng,HUANG Yanqin,YIN Xiuli,et al.Research on clean solid fuel derived from sludge employing hydrothermal treatment[J].Chemical Industry and Engineering Progress,2018,37(1):311-318.
[6] 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.
[7] 陶明涛,张华,王艳艳,等.基于部分湿式氧化法的污泥资源化研究[J].环境工程,2011,29(增刊1):402-404.TAO Mingtao,ZHANG Hua,WANG Yanyan,et al.Study on resource recovery of sludge based on partial wet air oxidation [J].Environmental Engineering,2011,29(Sup1):402-404.
[8] 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.
[9] 李维成,覃小刚,房慧,等.污泥湿式氧化试验研究及经济性分析[J].动力工程学报,2018,38(1):69-73.LI Weicheng,QIN Xiaogang,FANG Hui,et al.Experimental study and techno-economic analysis on hydro thermal oxidation of sewage sludge[J].Journal of Chinese Society of Power Engineering,2018,38(1):69-73.
[10] 中国煤炭工业协会.煤的工业分析方法:GB/T 212—2008[S].北京:中国标准出版社,2008.
[11] 中华人民共和国质量监督检疫总局,中国国家标准化管理委员会.城镇污水处理厂污泥处置混合填埋用泥质:GB/T 23485—2009[S].北京:中国标准出版社,2009.
[12] 中华人民共和国住房和城乡建设部.城镇污水处理厂污泥处理水泥熟料生产用泥质:CJ/T 314—2009[S].北京:中国标准出版社,2009.
[13] 中华人民共和国质量监督检疫总局,中华人民共和国环境保护部.生活垃圾填埋场污染物控制标准:GB 16889—2008[S].北京:中国标准出版社,2008.
[14] 中华人民共和国质量监督检疫总局,中国国家标准化委员会.污水排入城镇下水道水质标准:GB/T 31962—2015[S].北京:中国标准出版社,2015.
[15] BERTANZA G,GALESSI R,MENONI L,et al.Wet oxidation of sewage sludge from municipal and industrial WWTPs [J].Desalination and Water Treatment,2016,57(6):2422-2427.
[16] 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.
[17] MENONI L,BERTANZA G.Wet oxidation of sewage sludge:a mathematical model for estimating the performance based on the VSS/TSS ratio[J].Chemical Engineering Journal,2016,306:685-692.
[18] 刘姜裔,钟美娥,高权.Fe2+活化过硫酸钾降解2,4,6-三氯苯酚的研究[J].广州化工,2016,44(13):73-75.LIU Jiangyi,ZHONG Meie,GAO Quan.Study on potassium persulfate activated by Fe2+ for degradation of 2,4,6-trichlorophenol [J].Guangzhou Chemical Industry,2016,44(13):73-75.
[19] 朱炳辰.化学反应工程[M].5版.北京:化学工业出版社,2012.
[20] GUO Kunyu,WANG Tiefeng,LIU Yefei,et al.CFD-PBM simulations of a bubble column with different liquid properties [J].Chemical Engineering Journal,2017,329:116-127.
[21] 史士东.煤加氢液化工程学基础[M].北京:化学工业出版社,2012.
[22] WADAUGSORN K,LIMTRAKUL S,VATANATHAM T,et al.Hydrodynamic behaviors and mixing characteristics in an internal loop airlift reactor based on CFD simulation [J].Chemical Engineering Research and Design,2016,11(3):125-139.
[23] BERTANIA G,GALESSI R,MENONI L,et al.Wet oxidation of sewage sludge:full-scale experience and process modeling [J].Environmental Science and Pollution Research,2015,22(10):7306-7316.
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