稻草和生石灰对市政污泥干燥特性影响的研究
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摘要
采用20 mm薄层干燥实验研究了温度、添加稻草和生石灰对市政污泥干燥特性的影响.结果表明,温度是影响干燥时间及干燥速率的主要因素,随温度升高,污泥干燥速率的增加幅度增大,但干燥时间减少幅度下降.稻草添加量为1%和2%时,污泥表面积增加和传质阻力变小是污泥干燥速率增加的主要原因,随生石灰加入污泥,在各含水率区间干燥速率、干燥初始阶段干燥速率及最大干燥速率明显增加.
The influence of temperature,addition of straw and quicklime on the drying characteristics of sewage sludge is studied with 20 mm thin layer drying experiments. The results show that the temperature is the main factor affecting the drying time and drying rate. With the increase of temperature,the increase rate of the sludge drying rate increases,but the reduction of the drying time decreases. When the addition amount of straw was 1% and 2%,the increase of sludge surface area and the decrease of mass transfer resistance were the main reasons for the increase of the sludge drying rate. With the quicklime added to the sludge,the drying rate,the initial drying stage drying rate and the maximum drying rate were significantly increased in each moisture content range.
The influence of temperature,addition of straw and quicklime on the drying characteristics of sewage sludge is studied with 20 mm thin layer drying experiments. The results show that the temperature is the main factor affecting the drying time and drying rate. With the increase of temperature,the increase rate of the sludge drying rate increases,but the reduction of the drying time decreases. When the addition amount of straw was 1% and 2%,the increase of sludge surface area and the decrease of mass transfer resistance were the main reasons for the increase of the sludge drying rate. With the quicklime added to the sludge,the drying rate,the initial drying stage drying rate and the maximum drying rate were significantly increased in each moisture content range.
引文
[1]中华人民共和国国家统计局,中华人民共和国2016年国民经济和社会发展统计公报[M].2017.
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[3]FYTILI D,ZABANIOTOU A.Utilization of sewage sludge in EU application of old and new methods-A review[J].Renewable and Sustainable Energy Reviews,2008.12(1):116-140.
[4]RUIZ T,WISNIEWSKI C,KAOSOL T,et al.Influence of organic content in dewatering and shrinkage of urban residual sludge under controlled atmospheric drying[J].Process Safety and Environmental Protection,2007.85(1):104-110.
[5]MA XW,WENG HX,SU MH,et al.Drying sewage sludge using flue gas from power plants in China[J].Environmental Earth Sciences,2012.65(6):1841-1846.
[6]HUAN Li,SHUXIN Zou,CHENCHEN Li,Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying[J].Drying Technology,2012.30(14):1563-1569.
[7]王宝和.干燥动力学研究综述[J].干燥技术与设备,2009(2):51-56.
[8]BABALIS,SJ,PAPANICOLAOU E,Kyriakis N,et al.Evaluation of thin-layer drying models for describing drying kinetics of figs(Ficus carica)[J].Journal of Food Engineering,2006.75(2):205-214.
[9]姚萌,程国淡,谢小青,等.城市污水厂污泥化学调理深度脱水机理[J].环境工程学报,2012(08):2787-2792.
[10]DENEUXMUSTIN S,LARTIGES BS,VILLEMIN G,et al.Ferric Chloride and Lime conditioning of activated sludges:An electron microscopic study on resin-embedded samples[J].Water Research,2001.35(12):3018-3024.
[11]TAO T,PENG XF,LEE DJ,Thermal drying of wastewater sludge:Change in drying area owing to volume shrinkage and crack development[J].Drying Technology,2005.23(3):669-682.
[12]LEONARD A,VANDEVENNE P,SALMON T,et al.Wastewater sludge convective drying:Influence of sludge origin[J].Environmental Technology,2004.25(9):1051-1057.
[2]WERTHER J,OGADA T.Sewage sludge combustion[J].Progress in Energy and Combustion Science,1999.25(1):55-116.
[3]FYTILI D,ZABANIOTOU A.Utilization of sewage sludge in EU application of old and new methods-A review[J].Renewable and Sustainable Energy Reviews,2008.12(1):116-140.
[4]RUIZ T,WISNIEWSKI C,KAOSOL T,et al.Influence of organic content in dewatering and shrinkage of urban residual sludge under controlled atmospheric drying[J].Process Safety and Environmental Protection,2007.85(1):104-110.
[5]MA XW,WENG HX,SU MH,et al.Drying sewage sludge using flue gas from power plants in China[J].Environmental Earth Sciences,2012.65(6):1841-1846.
[6]HUAN Li,SHUXIN Zou,CHENCHEN Li,Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying[J].Drying Technology,2012.30(14):1563-1569.
[7]王宝和.干燥动力学研究综述[J].干燥技术与设备,2009(2):51-56.
[8]BABALIS,SJ,PAPANICOLAOU E,Kyriakis N,et al.Evaluation of thin-layer drying models for describing drying kinetics of figs(Ficus carica)[J].Journal of Food Engineering,2006.75(2):205-214.
[9]姚萌,程国淡,谢小青,等.城市污水厂污泥化学调理深度脱水机理[J].环境工程学报,2012(08):2787-2792.
[10]DENEUXMUSTIN S,LARTIGES BS,VILLEMIN G,et al.Ferric Chloride and Lime conditioning of activated sludges:An electron microscopic study on resin-embedded samples[J].Water Research,2001.35(12):3018-3024.
[11]TAO T,PENG XF,LEE DJ,Thermal drying of wastewater sludge:Change in drying area owing to volume shrinkage and crack development[J].Drying Technology,2005.23(3):669-682.
[12]LEONARD A,VANDEVENNE P,SALMON T,et al.Wastewater sludge convective drying:Influence of sludge origin[J].Environmental Technology,2004.25(9):1051-1057.