混凝-助凝-超滤工艺处理地表水膜污染

发布时间：2018-02-21 07:20

本文关键词： 聚合氯化铝三氯化铁聚丙烯酰胺超滤膜污染　出处：《哈尔滨工业大学学报》2017年02期 　论文类型：期刊论文

【摘要】：为考查混凝剂种类对混凝-助凝-超滤工艺处理较高浊度地表水时膜污染的影响,采用动态测絮体粒径的马尔文粒度仪和微型超滤系统研究聚合氯化铝(PACl)和三氯化铁(FeCl_3)与助凝剂聚丙烯酰胺(PAM)联用形成的絮体对超滤膜污染的影响.结果表明,固定混凝剂投量(PACl和FeCl_3为3 mg/L),当PAM投量在0~0.4 mg/L时,絮体粒径增至1 000μm,相对于单一投加PACl(3~370μm)和FeCl_3(360~420μm)时增长明显,且随投量增加比通量增大(PACl:0.56~0.64;FeCl_3:0.71~0.76)、滤饼层阻力减小(PACl:由0.90×10~(-11)降至0.52×10~(-11)m~(-1);FeCl_3:由0.47×10-11降至0.28×10~(-11)m~(-1));然而当PAM投量增大为1.0 mg/L时,比通量明显减小至0.48,而滤饼层阻力显著增加至1.55×10~(-11)m~(-1).因此,助凝剂PAM存在最优投量(0.4 mg/L)膜污染最小.结合纳米粒度仪和扫描电镜证明滤饼是主要污染机理,但膜孔堵塞在PAM投量高时明显.
[Abstract]:In order to investigate the effect of coagulant types on membrane fouling in the treatment of surface water with high turbidity by coagulation-assisted coagulation-ultrafiltration process, The effects of flocs formed by the combination of PACl and FeCl3) on the fouling of ultrafiltration membrane were studied by using Ma Erwen particle size meter and micro ultrafiltration system, which were used to measure the particle size of flocs dynamically. The results showed that the flocs formed by the combination of PACL and FeCl3) and polyacrylamide (PAM) as coagulant aids were used to study the effect of the flocs on the membrane fouling. The fixed coagulant dosage of PACL and FeCl_3 is 3 mg / L ~ (-1). When the dosage of PAM is 0 ~ 0. 4 mg/L, the particle size of flocs increases to 1 000 渭 m, which is obviously higher than that of PACl(3~370 渭 m and FeCl_3(360~420 渭 m). With the increase of specific flux, the specific flux of PACl-0.56 / 0.64FeCl-0.76 / 1 is reduced from 0.90 脳 10 ~ (-11) to 0.52 脳 10 ~ (10) ~ (-11) ~ (-1): from 0.47 脳 10 ~ (-11) to 0.28 脳 10 ~ (-1) mg/L. However, when the amount of PAM is increased to 1.0 mg/L, the specific flux decreases significantly to 0.48, while the cake layer resistance increases significantly to 1.55 脳 10 ~ (-10) -11m ~ (-1). Therefore, when the amount of PAM is increased to 1.0 mg/L, the specific flux decreases to 0.48, and the cake layer resistance increases significantly to 1.55 脳 10 ~ (-10) -11m ~ (-1). The optimum dosage of PAM was 0.4 mg / L) and the membrane fouling was the least. The filter cake was proved to be the main fouling mechanism by combining with nano-particle size analyzer and scanning electron microscope, but the membrane pore clogging was obvious when the dosage of PAM was high.
【作者单位】：城市水资源与水环境国家重点实验室(哈尔滨工业大学);
【基金】：国家自然科学基金优青项目(51522804) 新世纪优秀人才支持计划(NCET-13-0169)
【分类号】：TU991.2

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