人民长江2024，Vol.55Issue(1)：51-59,9.DOI:10.16232/j.cnki.1001-4179.2024.01.008
湖泊淤泥脱水固化复合调理剂优化及其作用机制
Optimization and action mechanism of composite conditioner for lake sludge dewatering and solidification
摘要
Abstract
Aiming at the difficult problem of dewatering and solidification of lake sludge,the composite conditioner formed by the combination of organic flocculant,inorganic flocculant and skeleton builder was used to modify the lake sludge.The ratio of each component was optimized by response surface method,and the mechanism of composite conditioner was discussed.The re-sults showed that the optimal combination of composite conditioner was 4.11 g/L polyaluminium chloride(PAC),0.18 g/L anion-ic polyacrylamide(APAM)and 18.06 g/L low alkaline sludge consolidation agent(LAC).After using the composite conditioner,the sludge specific resistance of lake sludge was reduced by 87.6%,the pressure filtration dehydration time was reduced by 70.6%,the tail water pH reached the discharge standard,and the dehydration efficiency was 5.9%higher than that of quicklime.The mechanism of the composite conditioner was as follows:the PAC component reduced the absolute value of the Zeta potential of the sludge by 9.5 mV,thereby reducing the electrostatic repulsion between the sludge particles;the subsequent addition of APAM played the role of adsorption-bridging,and aggregated the fine particles of the sludge into larger flocs,which was conducive to the discharge of water between the sludge particles;the final doping of LAC played the role of skeleton builder,creating a drainage channel in the process of sludge dewatering and compaction,increasing the porosity of sludge cake by 6.4%,and further impro-ving the dewatering effect.The research results can provide reference for the efficient and environmentally friendly disposal of lake sludge.关键词
湖泊淤泥/脱水固化/絮凝剂/骨架构建剂/响应曲面法Key words
lake sludge/sludge dewatering/flocculant/skeleton builder/response surface method分类
资源环境引用本文复制引用
王龙涛,夏新星..湖泊淤泥脱水固化复合调理剂优化及其作用机制[J].人民长江,2024,55(1):51-59,9.基金项目
中国交通建设集团科技研发项目"水环境生态修复关键技术研究及应用推广"(2019-ZJKJ-01) （2019-ZJKJ-01）
国家重点研发计划项目"黄河三角洲生态修复与水沙配置技术研究及示范"(2022YFC3204305) （2022YFC3204305）
