蛭石絮凝剂与助凝剂耦合对皮革废水预处理的效果及机理  

Effect and Mechanism of Vermiculite Flocculant Coupled with Coagulant Aid in the Pretreatment of Leather Wastewater

作　　者：于卓阳 张启磊 王少建 王力 曾明 王昶 YU Zhuoyang;ZHANG Qilei;WANG Shaojian;WANG Li;ZENG Ming;WANG Chang(College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China;Haomei Environmental Technology Co.,Ltd.,Shijiazhuang 052400,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457 [2]皓美环境技术有限公司,石家庄052400

出　　处：《天津科技大学学报》2025年第1期20-27,共8页Journal of Tianjin University of Science & Technology

基　　金：国家自然科学基金项目(22276135)。

摘　　要：使用无机矿物蛭石絮凝剂与有机高分子聚合物助凝剂聚丙烯酰胺(PAM)的耦合技术,分别考察蛭石絮凝剂及其与助凝剂PAM耦合对高浓度皮革废水絮凝预处理的效果及其机理。实验结果表明,当蛭石絮凝剂投加量为6 g/L时,高浓度皮革废水的浊度、化学需氧量(COD)、悬浮物(SS)质量浓度、总磷(TP)质量浓度和氨氮(NH3-N)质量浓度分别由原来的1240NTU、4415mg/L、911mg/L、2.49 mg/L和49.50 mg/L降低到35.6 NTU、1303mg/L、72 mg/L、0.3 mg/L和41.6 mg/L,去除率分别为97.1%、70.5%、92.1%、88.0%和16.0%;当蛭石絮凝剂投加量和助凝剂阳离子聚丙烯酰胺(C-PAM)投加量分别为6 g/L和12 mg/L时,絮凝后上清液更加清澈,其浊度、COD、SS质量浓度、TP质量浓度和NH3-N质量浓度分别可以达到23.90 NTU、1113mg/L、28 mg/L、0.25 mg/L和36.1 mg/L。蛭石絮凝剂主要依靠可溶态物质的电中和与颗粒物质的质量力吸附的协同作用,形成以密度较大的无机矿物微粒为骨架的絮体,有效地促进絮体的沉降;而助凝剂C-PAM或阴离子聚丙烯酰胺(A-PAM)主要是利用长链型聚合高分子的卷扫以及它的质量力和带有异性基团的吸附,使蛭石絮凝剂处理的絮体进行二次结团,形成更大的、透水性好、沉降速度快的沉积物,此时沉积物的体积不超过整个处理后浑浊液体积的7.1%;在以电中和为主的絮凝过程中,助凝剂C-PAM或A-PAM均有较好的处理效果,在实际应用中两者均可使用。The coupling technology of inorganic mineral vermiculite flocculant and organic polymer coagulant aid poly-acrylamide(PAM)was used in our current study to investigate the effect and mechanism of vermiculite flocculant alone and in combination with coagulant aid PAM on the flocculation pretreatment of high-concentration leather wastewater.Experi-mental results showed that when the dosage of vermiculite flocculant was 6 g/L,the turbidity,chemical oxygen demand(COD),suspended solids(SS)mass concentration,total phosphorus(TP)mass concentration,and ammonia nitrogen(NH3-N)mass concentration of high-concentration leather wastewater were reduced from the original 1240NTU,4415mg/L,911mg/L,2.49 mg/L,and 49.50 mg/L to 35.6NTU,1303mg/L,72 mg/L,0.3 mg/L,and 41.6 mg/L,respectively,with removal rates of 97.1%,70.5%,92.1%,88.0%,and 16.0%;when the dosage of vermiculite flocculant and cationic polyacrylamide(C-PAM)coagulant aid were 6 g/L and 12mg/L,respectively,the supernatant after flocculation was clearer,with turbidity,COD,SS mass concentration,TP mass concentration,and NH3-N mass concentration reaching 23.90 NTU,1113mg/L,28 mg/L,0.25 mg/L,and 36.1 mg/L,respectively.Vermiculite flocculant mainly relied on the syn-ergistic action of soluble substance’s charge neutralization and mass force adsorption of particulate matter to form flocs with a dense inorganic mineral particle framework,effectively promoting floc sedimentation;whereas coagulant aids C-PAM or anionic polyacrylamide(A-PAM)primarily utilized long-chain polymer sweeping and their mass force and adsorption with heterogeneous groups to re-cluster flocs treated by vermiculite flocculant,forming larger permeable,fast-settling sediments,with the sediment volume accounting for no more than 7.1%of the total volume of the treated turbid liquid.In the floccula-tion process primarily driven by charge neutralization,both C-PAM and A-PAM coagulant aids showed good treatment ef-fects and can be used in practical applications.

关 键 词：皮革废水 蛭石絮凝剂 絮凝机理 协同作用 

分 类 号：X703.1[环境科学与工程—环境工程]