芬顿试剂改性市政污泥真空固结模型试验研究
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摘要
市政污水处理厂产生的脱水污泥体积大、含水率高、工程性质极差,为了对污泥进行深度脱水,开展了芬顿试剂改性市政污泥真空固结模型试验.通过一维真空固结试验探究芬顿试剂对污泥的脱水性能以及固结特性的改良作用,再进行污泥径向真空固结试验.对2种真空固结方式过程中的排水量、压缩沉降等进行监测,并测试分析了试验后污泥含水率和强度.结果表明:经芬顿试剂调理后污泥排水固结性大为改善,当芬顿试剂添加量为22%时,真空排水固结时间大幅缩短,试验后污泥含水率大幅降低,体积大幅减小;径向真空固结试验中,经芬顿试剂调理后污泥真空预压261.5 h后平均含水率与污泥体积有大幅降低,但试验后期滤膜的淤堵与井阻效应明显,2种真空作用方式下平均固结系数在数值上相差较大.研究表明,采用芬顿试剂改性市政污泥真空固结处理方法效果显著,能够实现污泥的加固与减量化.
Municipal dewatering sludge and landfill sludge are of large size, high moisture content, poor engineering properties, and the deep dehydration of sludge is difficult. The vacuum consolidation test of municipal sludge conditioned by the Fenton reagent was carried out. The improvement of the dewatering performance and consolidation characteristics of the sludge modified was studied by the one-dimensional vacuum consolidation test, and then the radial vacuum consolidation test was conducted. The water content and strength were tested, and the consolidation characteristics were analyzed. The results show that in one-dimensional vacuum consolidation tests, the consolidation performance of the sludge conditioned by Fenton reagent is greatly improved. When the dose is 22%, the drainage time is shortened, the moisture content is decreased and the volume is reduced. In radial vacuum consolidation tests, after 261.5 h the average moisture content and volume of the sludge conditioned by Fenton reagent are reduced. However, the siltation of the filtration membrane and great resistance effect is obvious at the late stage of the tests, and the average consolidation coefficient is quite different in numerical values. The research indicates that the vacuum consolidation treatment for the Fenton modified municipal sludge has a remarkable effect, which achieves the consolidation and reduction of sludge.
Municipal dewatering sludge and landfill sludge are of large size, high moisture content, poor engineering properties, and the deep dehydration of sludge is difficult. The vacuum consolidation test of municipal sludge conditioned by the Fenton reagent was carried out. The improvement of the dewatering performance and consolidation characteristics of the sludge modified was studied by the one-dimensional vacuum consolidation test, and then the radial vacuum consolidation test was conducted. The water content and strength were tested, and the consolidation characteristics were analyzed. The results show that in one-dimensional vacuum consolidation tests, the consolidation performance of the sludge conditioned by Fenton reagent is greatly improved. When the dose is 22%, the drainage time is shortened, the moisture content is decreased and the volume is reduced. In radial vacuum consolidation tests, after 261.5 h the average moisture content and volume of the sludge conditioned by Fenton reagent are reduced. However, the siltation of the filtration membrane and great resistance effect is obvious at the late stage of the tests, and the average consolidation coefficient is quite different in numerical values. The research indicates that the vacuum consolidation treatment for the Fenton modified municipal sludge has a remarkable effect, which achieves the consolidation and reduction of sludge.
引文
[1] 毛华臻.市政污泥水分分布特性和物理化学调理脱水的机理研究[D].杭州:浙江大学,2016.Mao H Z.Study on the moisture distribution of sewage sludge and the mechanism of physical and chemical pre-treatment[D].Hangzhou:Zhejiang University,2016.(in Chinese)
[2] 朱婧,洪宝宁,刘鑫.污泥、淤泥和黏性土的压缩特性对比试验研究[J].科学技术与工程,2018,18(4):328-332.DOI:10.3969/j.issn.1671-1815.2018.04.052.Zhu J,Hong B N,Liu X.Comparative experimental investigation on compressive behavior of sewage sludge,dredged material and cohesive soil[J].Science Technology and Engineering,2018,18(4):328-332.DOI:10.3969/j.issn.1671-1815.2018.04.052.(in Chinese)
[3] Tsang K R,Vesilind P A.Moisture distribution in sludges[J].Water Science and Technology,1990,22(12):135-142.DOI:10.2166/wst.1990.0108.
[4] Chai J C,Carter J P,Hayashi S.Vacuum consolidation and its combination with embankment loading[J].Canadian Geotechnical Journal,2006,43(10):985-996.DOI:10.1139/t06-056.
[5] Chu J,Goi M H,Lim T T.Consolidation of cement-treated sewage sludge using vertical drains[J].Canadian Geotechnical Journal,2005,42(2):528-540.DOI:10.1139/t04-114.
[6] 占鑫杰,林伟岸,詹良通,等.市政污泥真空预压模型试验研究[J].岩土力学,2013,34(S1):88-96.DOI:10.16285/j.rsm.2013.s1.064.Zhan X J,Lin W A,Zhan L T,et al.Model test study of vacuum preloading on municipal sludge[J].Rock and Soil Mechanics,2013,34(S1):88-96.DOI:10.16285/j.rsm.2013.s1.064.(in Chinese)
[7] Lin W A,Zhan X J,Zhan T L,et al.Effect of FeCl3-conditioning on consolidation property of sewage sludge and vacuum preloading test with integrated PVDs at the Changan landfill,China[J].Geotextiles and Geomembranes,2014,42(3):181-190.DOI:10.1016/j.geotexmem.2013.12.008.
[8] 武亚军,唐欣,崔春义,等.城市生活污泥真空固结特性试验研究[J].东南大学学报(自然科学版),2018,48(4):772-780.DOI:10.3969/j.issn.1001-0505.2018.04.026.Wu Y J,Tang X,Cui C Y,et al.Experimental study on characteristics of vacuum consolidation of municipal sludge[J].Journal of Southeast University(Natural Science Edition),2018,48(4):772-780.DOI:10.3969/j.issn.1001-0505.2018.04.026.(in Chinese)
[9] Wu Y J,Lin Z X,Kong G Q,et al.Treatment of municipal sludge by Fenton oxidation combined vacuum preloading[J].Environmental Science and Pollution Research,2018,25(16):15990-15997.DOI:10.1007/s11356-018-1736-5.
[10] Neyens E,Baeyens J,Weemaes M,et al.Pilot-scale peroxidation (H2O2) of sewage sludge[J].Journal of Hazardous Materials,2003,98(1/2/3):91-106.DOI:10.1016/S0304-3894(02)00287-X.
[11] 潘胜,黄光团,谭学军,等.Fenton试剂对剩余污泥脱水性能的改善[J].净水技术,2012,31(3):26-31,35.DOI:10.3969/j.issn.1009-0177.2012.03.007.Pan S,Huang G T,Tan X J,et al.Improvement of excess sludge dewatering performance with Fenton reagent[J].Water Purification Technology,2012,31(3):26-31,35.DOI:10.3969/j.issn.1009-0177.2012.03.007.(in Chinese)
[12] He D Q,Wang L F,Jiang H,et al.A Fenton-like process for the enhanced activated sludge dewatering[J].Chemical Engineering Journal,2015,272:128-134.DOI:10.1016/j.cej.2015.03.034.
[13] 刘怡君.芬顿反应强化污泥脱水试验及机理研究[J].环境工程,2017,35(4):55-59.DOI:10.13205/j.hjgc.201704012.Liu Y J.Experiment study on enhanced dewatering of sludge with Fenton reaction[J].Environmental Engineering,2017,35(4):55-59.DOI:10.13205/j.hjgc.201704012.(in Chinese)
[14] 王丽苹.FeO/H2O2 类芬顿法对污泥脱水性能的改善及机理分析[D].广州:华南理工大学,2018.Wang L P.Improvement and mechanism analysis of sludge dewatering performance by FeO/H2O2 Fenton method [D].Guangzhou:South China University of Technology,2018.
[15] 詹良通,张佩,占鑫杰,等.化学调理对市政污泥真空预压处理过程中低渗透层控制效果试验研究[J].东南大学学报(自然科学版),2016,46(S1):7-13.DOI:10.3969/j.issn.1001-0505.2016.S1.002.Zhan L T,Zhang P,Zhan X J,et al.Experimental study on inhibition effect of chemical conditioning on low permeability sewage sludge layer under conditions of vacuum preloading[J].Journal of Southeast University(Natural Science Edition),2016,46(S1):7-13.DOI:10.3969/j.issn.1001-0505.2016.S1.002.(in Chinese)
[16] Al-Shamrani M A.Applicability of the rectangular hyperbolic method to settlement predictions of sabkha soils[J].Geotechnical and Geological Engineering,2004,22(4):563-587.DOI:10.1023/b:gege.0000047046.73649.04.
[17] Sridharan A,Rao A S.Rectangular hyperbola fitting method for one dimensional consolidation [J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1981,4(4):355-368.DOI:10.1016/0148-9062(83)91684-4.
[18] 武亚军,陆逸天,骆嘉成,等.药剂真空预压法在工程废浆处理中的防淤堵作用[J].岩土工程学报,2017,39(3):525-533.DOI:10.11779/CJGE201703017.Wu Y J,Lu Y T,Luo J C,et al.Anti-clogging function of vacuum preloading with flocculants in solid-liquid separation of construction waste slurry[J].Chinese Journal of Geotechnical Engineering,2017,39(3):525-533.DOI:10.11779/CJGE201703017.(in Chinese)
[19] Hansbo S.Consolidation of fine-grained soils by prefabricated drain [C]// Proceedings of 10th International Conference on Soil Mechanics and Foundation Engineering.Sweden,Stockholm,1981:677-682.
[2] 朱婧,洪宝宁,刘鑫.污泥、淤泥和黏性土的压缩特性对比试验研究[J].科学技术与工程,2018,18(4):328-332.DOI:10.3969/j.issn.1671-1815.2018.04.052.Zhu J,Hong B N,Liu X.Comparative experimental investigation on compressive behavior of sewage sludge,dredged material and cohesive soil[J].Science Technology and Engineering,2018,18(4):328-332.DOI:10.3969/j.issn.1671-1815.2018.04.052.(in Chinese)
[3] Tsang K R,Vesilind P A.Moisture distribution in sludges[J].Water Science and Technology,1990,22(12):135-142.DOI:10.2166/wst.1990.0108.
[4] Chai J C,Carter J P,Hayashi S.Vacuum consolidation and its combination with embankment loading[J].Canadian Geotechnical Journal,2006,43(10):985-996.DOI:10.1139/t06-056.
[5] Chu J,Goi M H,Lim T T.Consolidation of cement-treated sewage sludge using vertical drains[J].Canadian Geotechnical Journal,2005,42(2):528-540.DOI:10.1139/t04-114.
[6] 占鑫杰,林伟岸,詹良通,等.市政污泥真空预压模型试验研究[J].岩土力学,2013,34(S1):88-96.DOI:10.16285/j.rsm.2013.s1.064.Zhan X J,Lin W A,Zhan L T,et al.Model test study of vacuum preloading on municipal sludge[J].Rock and Soil Mechanics,2013,34(S1):88-96.DOI:10.16285/j.rsm.2013.s1.064.(in Chinese)
[7] Lin W A,Zhan X J,Zhan T L,et al.Effect of FeCl3-conditioning on consolidation property of sewage sludge and vacuum preloading test with integrated PVDs at the Changan landfill,China[J].Geotextiles and Geomembranes,2014,42(3):181-190.DOI:10.1016/j.geotexmem.2013.12.008.
[8] 武亚军,唐欣,崔春义,等.城市生活污泥真空固结特性试验研究[J].东南大学学报(自然科学版),2018,48(4):772-780.DOI:10.3969/j.issn.1001-0505.2018.04.026.Wu Y J,Tang X,Cui C Y,et al.Experimental study on characteristics of vacuum consolidation of municipal sludge[J].Journal of Southeast University(Natural Science Edition),2018,48(4):772-780.DOI:10.3969/j.issn.1001-0505.2018.04.026.(in Chinese)
[9] Wu Y J,Lin Z X,Kong G Q,et al.Treatment of municipal sludge by Fenton oxidation combined vacuum preloading[J].Environmental Science and Pollution Research,2018,25(16):15990-15997.DOI:10.1007/s11356-018-1736-5.
[10] Neyens E,Baeyens J,Weemaes M,et al.Pilot-scale peroxidation (H2O2) of sewage sludge[J].Journal of Hazardous Materials,2003,98(1/2/3):91-106.DOI:10.1016/S0304-3894(02)00287-X.
[11] 潘胜,黄光团,谭学军,等.Fenton试剂对剩余污泥脱水性能的改善[J].净水技术,2012,31(3):26-31,35.DOI:10.3969/j.issn.1009-0177.2012.03.007.Pan S,Huang G T,Tan X J,et al.Improvement of excess sludge dewatering performance with Fenton reagent[J].Water Purification Technology,2012,31(3):26-31,35.DOI:10.3969/j.issn.1009-0177.2012.03.007.(in Chinese)
[12] He D Q,Wang L F,Jiang H,et al.A Fenton-like process for the enhanced activated sludge dewatering[J].Chemical Engineering Journal,2015,272:128-134.DOI:10.1016/j.cej.2015.03.034.
[13] 刘怡君.芬顿反应强化污泥脱水试验及机理研究[J].环境工程,2017,35(4):55-59.DOI:10.13205/j.hjgc.201704012.Liu Y J.Experiment study on enhanced dewatering of sludge with Fenton reaction[J].Environmental Engineering,2017,35(4):55-59.DOI:10.13205/j.hjgc.201704012.(in Chinese)
[14] 王丽苹.FeO/H2O2 类芬顿法对污泥脱水性能的改善及机理分析[D].广州:华南理工大学,2018.Wang L P.Improvement and mechanism analysis of sludge dewatering performance by FeO/H2O2 Fenton method [D].Guangzhou:South China University of Technology,2018.
[15] 詹良通,张佩,占鑫杰,等.化学调理对市政污泥真空预压处理过程中低渗透层控制效果试验研究[J].东南大学学报(自然科学版),2016,46(S1):7-13.DOI:10.3969/j.issn.1001-0505.2016.S1.002.Zhan L T,Zhang P,Zhan X J,et al.Experimental study on inhibition effect of chemical conditioning on low permeability sewage sludge layer under conditions of vacuum preloading[J].Journal of Southeast University(Natural Science Edition),2016,46(S1):7-13.DOI:10.3969/j.issn.1001-0505.2016.S1.002.(in Chinese)
[16] Al-Shamrani M A.Applicability of the rectangular hyperbolic method to settlement predictions of sabkha soils[J].Geotechnical and Geological Engineering,2004,22(4):563-587.DOI:10.1023/b:gege.0000047046.73649.04.
[17] Sridharan A,Rao A S.Rectangular hyperbola fitting method for one dimensional consolidation [J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1981,4(4):355-368.DOI:10.1016/0148-9062(83)91684-4.
[18] 武亚军,陆逸天,骆嘉成,等.药剂真空预压法在工程废浆处理中的防淤堵作用[J].岩土工程学报,2017,39(3):525-533.DOI:10.11779/CJGE201703017.Wu Y J,Lu Y T,Luo J C,et al.Anti-clogging function of vacuum preloading with flocculants in solid-liquid separation of construction waste slurry[J].Chinese Journal of Geotechnical Engineering,2017,39(3):525-533.DOI:10.11779/CJGE201703017.(in Chinese)
[19] Hansbo S.Consolidation of fine-grained soils by prefabricated drain [C]// Proceedings of 10th International Conference on Soil Mechanics and Foundation Engineering.Sweden,Stockholm,1981:677-682.
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