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

发布时间：2018-06-24 12:36

本文选题：市政污泥 + 低渗透层　；参考：《东南大学学报(自然科学版)》2016年S1期

【摘要】：由于市政污泥真空预压处理过程中排水板周围易形成低渗透层,从而降低污泥的排水效率,利用真空抽滤试验和装置模拟和研究在滤布上方(0~5 cm)污泥中添加化学调理剂和改变土工布孔径2类措施对低渗透层的控制效果.抽滤过程中测试抽滤液总量、含固量及抽滤速度,试验结束后,对不同高度处的污泥柱体进行切片取样来测量污泥残余含水量.结果表明,增大土工布孔径不能显著改善污泥排水效果,滤饼在试验后1 h会形成.采用氯化铁、氧化钙及粉煤灰组合调理剂整体排水效果最好,滤布上方(0~3 cm)污泥残余含水量降到200%左右;采用氯化铁-阳离子聚丙烯酰胺或者氯化铁-壳聚糖组合调理剂可显著提高污泥排水效率,滤布上方(0~3 cm)污泥含水量降到250%左右.在实际工程中可利用氯化铁、氧化钙及粉煤灰组合配方来调理污泥.
[Abstract]:Due to the formation of low permeability layer around the drainage plate in the process of municipal sludge vacuum preloading, the efficiency of sludge drainage is reduced. The control effect of adding chemical conditioning agent and changing the pore diameter of geotextile in the sludge above the filter cloth (0 ~ 5 cm) on the low permeability layer was simulated and studied by vacuum filtration test and equipment. In the process of filtration, the total amount, solid content and filtration rate of the filtrate were measured. After the experiment, the sludge cylinders at different heights were sliced to measure the residual water content of the sludge. The results showed that increasing the pore diameter of geotextile could not significantly improve the sludge drainage effect, and the filter cake would form 1 hour after the experiment. The combined conditioning agent of ferric chloride, calcium oxide and fly ash has the best overall drainage effect, and the residual water content of sludge above the filter cloth (0 ~ 3 cm) is reduced to about 200%. Using ferric chloride cationic polyacrylamide or ferric chloride chitosan combined conditioning agent can significantly improve sludge drainage efficiency. The water content of sludge above the filter cloth (0 ~ 3 cm) is reduced to about 250%. The combined formula of ferric chloride, calcium oxide and fly ash can be used to regulate sludge in practical engineering.
【作者单位】：浙江大学软弱土与环境土工教育部重点实验室;南京水利科学研究院岩土工程研究所;
【基金】：国家自然科学基金资助项目(51478426)
【分类号】：X703

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