摘要
针对疏浚泥浆颗粒细小、结构松散、比表面积大,其表面和内部的胞外聚合物(EPS)持水能力强导致泥水分离困难的问题,采用芬顿(Fenton)氧化-复配混凝剂法开展疏浚泥浆快速泥水分离试验。以泥浆体积削减率最大化为目标,采用正交试验和响应面法优化工艺条件,并对EPS浓度进行分析。结果表明,影响Fenton氧化泥水分离效果的主要因素为药剂投加量;同成本条件下Fenton氧化-聚合氯化铝混凝的泥水分离效果最佳;响应面法确定的泥水分离效果影响因素排序为:助凝剂种类>搅拌速度>助凝剂投加量,试验条件下最优工艺条件为:聚丙烯酰胺投加量0.255 g/L,搅拌速度125 r/min;经Fenton氧化-复配混凝后EPS中带正电荷的蛋白质含量大幅增加,可中和泥浆负电荷的作用,实现疏浚泥浆的快速泥水分离。研究成果对于疏浚泥浆的快速泥水分离工程实践具有理论指导意义。
Aiming at the problems of fine particles,loose structure,large specific surface area and strong water holding capacity of extracellular polymer substances(EPS)on the surface and inside of dredged slurry,which makes it difficult to separate water from the dredged slurry,Fenton oxidation-compound coagulant method is used to carry out the rapid slurry and water separation test of dredged slurry.With the goal of maximizing the slurry volume reduction rate,the orthogonal test and response surface method are used to optimize the process conditions,and the change of EPS concentration is analyzed.The results show that the main factor affecting Fenton oxidation effect is chemical agent dosage.Under the same cost condition,the slurry and water separation effect after Fenton oxidation-polyaluminum chloride treatment is the best.The order of the factors influencing slurry and water separation effect determined by the response surface method is coagulant additives type>stirring speed>coagulant additives dosage.Under the conditions of this experiment,the optimal process conditions are that the polyacrylamide dosage is 0.255 g L and the stirring speed is 125 r min.After Fenton oxidation-composite coagulation,the content of positively charged protein in EPS increases significantly,which can neutralize the negative charge of slurry and realize the rapid slurry and water separation of dredged slurry.The research results have theoretical significance for the practice of rapid slurry and water separation engineering of dredged slurry.
作者
周和友
张玉明
韩久春
张琼
周旭阳
徐得潜
冯景伟
ZHOU Heyou;ZHANG Yuming;HAN Jiuchun;ZHANG Qiong;ZHOU Xuyang;XU Deqian;FENG Jingwei(Anhui Construction Engineering Traffic&Shipping Group Co.,Ltd.,Hefei 230022,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources,Hefei 230009,China)
出处
《水运工程》
北大核心
2023年第12期22-27,69,共7页
Port & Waterway Engineering
基金
安徽省交通运输行业重点科技项目(2021-KJQD-021)
引江济淮航运部分科研项目(2021-HY-07)。
关键词
疏浚泥浆
FENTON氧化
复配混凝
泥水分离
胞外聚合物
dredged slurry
Fenton oxidation
composite coagulation
slurry and water separation
extracellular polymer substances
