东南大学学报（自然科学版）2016，Vol.46Issue(z1)：7-13,7.DOI:10.3969/j.issn.1001-0505.2016.S1.002
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
Experimental study on inhibition effect of chemical conditioning on low permeability sewage sludge layer under conditions of vacuum preloading
摘要
Abstract
Due to the low permeability layers formed around drainage plates under conditions of sew-age sludge vacuum preloading can decrease the dewatering efficiency,vacuum filtration installations and tests are used to simulate and study the inhibition effects on the low permeability layers, taking two methods of adding different chemical conditioners into the sludge above the filter ( 0 to 5 cm ) and changing pore-opening size of geotexiles. During the filtration process, cumulative amount of filtration(CAF),filtration rate(FR), and solid content(SC) are calculated;after the test, sludge re-sidual water content( SRWC) is obtained by slicing the sludge samples at different heights. The re-sults indicate that the enlargement of geotexile pore size can not improve the dewatering efficiency, and the low permeability layer are formed in 1 h after the test. The utilization of ferric chloride, lime , and fly ash at vicinity area of filter shows the best dewatering efficiency and inhibits the forma-tion of low permeability layer, getting a water content of 200% ( dry basis) at vicinity area of filter (0 to 3 cm) . And the conditioners of ferric chloride with cationic polyacrylamide or chitosan obtain a water content of 250% ( dry basis) at vicinity area of filter (0 to 3 cm) . In actual engineering, the combination of ferric chloride, lime, and fly ash can be used efficiently.关键词
市政污泥/低渗透层/真空预压/土工布/化学调理剂Key words
sewage sludge/low permeability layer/vacuum preloading/geotexiles/chemical con-ditioners分类
建筑与水利引用本文复制引用
詹良通,张佩,占鑫杰,林伟岸..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(z1):7-13,7.基金项目
国家自然科学基金资助项目(51478426) （51478426）
