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Water Treatment by Submerged Membrane Separation in Sedimentation Tank with Powdered Activated Carbon Dosage

粉状活性炭投加沉淀池浸没式膜分离水处理

基本信息

批准号：
07650644
负责人：
AYA Hidenori
金额：
$ 1.34万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650644/
关键词：
water treatment membrane separation activated carbon flux of membrane 有機物除去膜の閉塞

项目摘要

The researcher developed potable water treatment system by micro-filtration membrane modules submerged in sedimentation tanks. The system can stand for heavy suspended solid lording during a flood, however it can not remove dissolved organic substances such as bad taste and odor.Powdered Activated Carbon (PAC) can be added to remove organic substances, but it may disturb membrane separation.To investigate the effect of PAC on membrane separation, constant pressure filtration experiments were conducted using small membrane modules that were driven by a magnetic stirrer. The raw water was river water polluted by treated sewage. Different sets of pressure with PAC addition or without PAC were tested. Back-washing and chemical washing were also applied to determine feasibility of the membrane system.Addition of PAC did not disturb membrane separation at all and it rather delayd clogging of membrane. Increase rate of resistance of membrane with PAC was apparently smaller than that of without PAC.Resistance of membranes of higher filtration pressure was larger than that of lower pressure modules. There was not much difference of flux between the high pressure modules and the lower pressure ones. When the feed water was aerated and suspended solid was kept from settled, the resistance decreased.The membrane and accumulated layr on the surface were compressed and the resistance increased, when high filtration pressure was applied. This means that lower filtration pressure extends clogging membrane and produces more water during a filtration cycle between chemical washings. The high suspended solid concentration of PAC or silt of which specific resistance is small will not affect filtration and rather prevents accumulation of fine particles that increase resistance. The feasibility of applying PAC at membrane separation was confirmed.

研究人员通过浸没在沉淀池中的微滤膜组件开发了饮用水处理系统。该系统可以承受洪水期间的重悬浮固体沉淀，但不能去除溶解性有机物，如不良味道和气味。可以添加粉末活性炭（PAC）去除有机物，但可能会干扰膜分离。为了研究PAC对膜分离的影响，利用磁力搅拌器驱动的小型膜组件进行恒压过滤实验。原水为经处理后的污水污染的河水。测试了添加 PAC 或不添加 PAC 的不同压力组。还应用反冲洗和化学冲洗来确定膜系统的可行性。PAC的添加完全不干扰膜分离，并且相当延迟膜的堵塞。添加PAC的膜阻力增加幅度明显小于未添加PAC的膜阻力，过滤压力较高的膜阻力大于过滤压力较低的组件。高压模块和低压模块之间的通量差异不大。当给水曝气并阻止悬浮固体沉降时，阻力减小。当施加高过滤压力时，膜和表面的积累层被压缩，阻力增大。这意味着较低的过滤压力会延长膜的堵塞时间，并在化学清洗之间的过滤循环中产生更多的水。 PAC或比阻力较小的淤泥的悬浮固体浓度高，不会影响过滤，而是防止增加阻力的细颗粒的积累。证实了PAC在膜分离中应用的可行性。