聚合氯化铝预处理污泥联合脱水有效性及机理  

The effectiveness and mechanism of combined dewatering of polyaluminum chloride pretreatment sludge

作　　者：汤连生 陈洋 曾显帅 程子华 丁威涯 TANG Liansheng;CHEN Yang;ZENG Xianshuai;CHENG Zihua;DING Weiya(School of Architectural Engineering,Guangzhou Institute of Science and Technology,Guangzhou 510540,China;School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China;The Fourth Construction Co.,Ltd.of China Construction Eighth Engineering Bureau,Qingdao 266100,China)

机构地区：[1]广州理工学院建筑工程学院,广东广州510540 [2]中山大学地球科学与工程学院,广东珠海519082 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [4]广东地质过程与矿产资源探查重点实验室,广东广州510275 [5]中建八局第四建设有限公司,山东青岛266100

出　　处：《中山大学学报（自然科学版）（中英文）》2024年第4期37-46,共10页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(42277142);广州理工学院专项基金资助国家级培育项目(2024gjp002);广州理工学院科研启动经费(2023KYQ028)。

摘　　要：为研究聚合氯化铝对污泥脱水性能的影响及其联合不同脱水手段对污泥脱水性能的提升机理,本文开展了自重脱水、离心脱水和渗析脱水试验,研究发现8%掺量的聚合氯化铝预处理污泥联合渗析脱水的效果最佳。其最佳掺量的预处理污泥的残余含水率可脱水降至36.2%,其重力水、封闭水、包裹水和结合水分别为81.2%、10.2%、7.3%、1.3%。污泥经聚合氯化铝预处理后,其污泥颗粒间距缩小、孔隙减少,无明显大孔隙,结构趋于均一化,结构更紧密,联合渗析脱水处理的聚合氯化铝最佳掺量预处理污泥孔隙率最低降至0.29。推测是由于聚合氯化铝使污泥凝聚成细小而密实污泥颗粒,而这种类骨架的结构有利于渗析力的传递,自由水不断排出,污泥结构继续趋于紧密,促进渗析力在污泥中传递。To investigate the influence of polyaluminum chloride on sludge dewatering performance and the mechanism of combining different dewatering methods to improve sludge dewatering performance,this paper carried out self-weight dehydration,centrifugal dehydration,and dialysis dehydration tests.It is found that 8%of polyaluminum chloride pretreatment combined with dialysis dehydration has the best effect.The residual moisture content of the optimally pretreated sludge reduces to 36.2%by dehydration,and its gravity water,enclosed water,enclosed water,and bound water are 81.2%,10.2%,7.3%,and 1.3%,respectively.After the sludge is pretreated with polyaluminum chloride,the spacing between the sludge particles is narrowed,the pores are reduced,there are no obvious large pores,and the structures tend to be uniform and more compact.The porosity is reduced to as low as 0.29 by using the optimal amount of polyaluminum chloride pretreatment combined with dialysis dehydration.It is speculated that polyaluminum chloride condenses the sludge into small and dense sludge particles,and this skeleton structure is conducive to the transfer of dialysis force;while free water is discharged continuously,the sludge structure continues to be closer,and promoting the transfer of dialysis force in the sludge.

关 键 词：聚合氯化铝 污泥 不同脱水方法 脱水机理 

分 类 号：TU992[建筑科学—市政工程]