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.

研究人员通过浸入沉积罐中的微滤膜模块开发了饮用水处理系统。该系统可以在洪水期间代表沉重的悬浮固体勋爵，但是它不能去除溶解的有机物质，例如不良的味道和气味。可以添加蒸的活性碳（PAC）以去除有机物质，但可能会干扰膜分离。研究PAC对膜分离的影响，使用由磁性搅拌器驱动的小膜模块进行恒定压力过滤实验。原水是经过处理的污水污染的河水。测试了与PAC添加或无PAC的不同压力集。还采用了后洗和化学洗涤来确定膜系统的可行性。PAC的调整完全没有干扰膜分离，并且膜的堵塞却延迟了。膜与PAC的电阻率的增加显然比没有PAC的膜的抗性速率要小。较高过滤压力的膜的阻抗大于较低压力模块的膜。高压模块和较低压力的通量没有太大差异。当进料水被充气并悬浮固体降低时，电阻会降低。当施加高过滤压力时，膜和累积的Layr被压缩并增加了电阻。这意味着较低的过滤压力会延伸堵塞膜，并在化学洗涤之间的过滤周期中产生更多的水。特异性为小的PAC或淤泥的高悬浮固体浓度不会影响过滤，而是可防止增加耐药性的细颗粒的积累。确认在膜分离处使用PAC的可行性。