PCNF絮凝剂处理高藻水缓解超滤膜污染特性分析  

Analysis of the Characteristics of PCNF Flocculant Treatment of Hyper Algae Water to Alleviate Ultrafiltration Membrane Pollution

作　　者：王冰[1] 刘光洲 潘海丰 姚萌 WANG Bing;LIU Guangzhou;PAN Haifeng;YAO Meng(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Shenzhen Information Vocational and Technical College,Shenzhen 518172,China)

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168 [2]深圳信息职业技术学院,广东深圳518172

出　　处：《水处理技术》2024年第10期44-50,共7页Technology of Water Treatment

基　　金：辽宁省科技厅应用基础研究计划(2022JH2/101300120);深圳市高等院校稳定支持计划(20220817233950003)。

摘　　要：本文以自制纳米Fe_(3)O_(4)为凝聚核心,羧甲基纤维素钠(CMC-Na)为粘合剂,搭配聚合硫酸铁(PFS)制备了新型复合絮凝剂(PCNF)。研究结果表明,纳米Fe_(3)O_(4)和PFS的质量比是决定新型絮凝剂PCNF絮凝效果的关键因素,当纳米Fe_(3)O_(4)和PFS的质量比为1:3时,Zeta电位为-1.5 mV,吸附电中和作用下对藻类物质去除效果较好。表面带有负电荷且具有松散结构的絮体,在超滤膜表面形成易于冲洗的滤饼层,且与超滤膜表面形成较强的静电斥力,超滤过程中比通量下降至0.69,相对污染总值0.33且不可逆污染占比仅仅34.65%,均优于传统絮凝剂PACl。通过微界面机制分析认为,新型PCNF絮凝剂与藻类物质形成的絮体结构,对缓解高藻水体引起的超滤膜污染有重要作用。This article presents a novel composite flocculant(PCNF)prepared by using self-made nano-Fe3 O4 as the aggregation core and carboxymethyl cellulose sodium(CMC-Na)as the binder with polymerized ferric sulfate(PFS).The research results demonstrated that the mass ratio of nano-Fe3 O4 and PFS is a key factor determining the flocculation effectiveness of the PCNF.When the mass ratio of nano-Fe3 O4 to PFS is 1:3,the absolute value of Zeta potential is-1.5 mV,and the removal efficiency of algal substances under the adsorption-electrostatic neutralization effect is optimal.The flocs with a loose structure and negative surface charge form an easily washable filter cake layer on the ultrafiltration membrane surface and exhibit a strong electrostatic repulsion with the membrane surface.During the ultrafiltration process,the permeate flux is reduced to 0.69,the relative pollution index is 0.33,and the irreversible pollution accounts for only 34.65%,which is superior to the traditional flocculant PACl.Through micro-interface mechanism analysis,it is believed that the flocs structure formed by the novel PCNF flocculant and algal substances plays a significant role in mitigating membrane fouling caused by high-algal water.

关 键 词：高藻水 纳米Fe_(3)O_(4) 聚合硫酸铁 超滤膜 膜污染 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]