外文翻译-饮用水处理通过用金属膜制成的凝固—微滤来去除天然有机物质

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1、 1 中文 4300 字 ,2600 单词， 1.4 万英文字符 出处： Leiknes T, degaard H, Myklebust H. Removal of natural organic matter (NOM) in drinking water treatment by coagulationmicrofiltration using metal membranesJ. Journal of Membrane Science, 2004, 242(12):47-55. 外文资料 Removal of natural organic matter (NOM) in drinking

2、 water treatment by coagulationmicrofiltration using metal membranes Torove Leiknes, Hallvard degaard, Hvard Myklebust Abstract Drinking water sources in Norway are characterized by high concentrations of natural organic matter (NOM), low pH, low alkalinity and low turbidity. The removal of NOM is t

3、herefore in ma ny cases a general requirement in producing potable water. Drinking water treatment plants are commonly designed with coagulation direct filtration or with NF spiral wound membrane processes. This study has investigated the feasibility and potential of using inorganic metal microfiltr

4、ation membranes in a submerged membrane configuration with coagulation pre-treatment for drinking water produc tion. Variations in operating modes and conditions were tested, from dead-end operation to semi sequencing batch operation using air scouring and backwashing cycles for membrane cleaning an

5、d fouling control. Fluxes around 180 LMH at trans membrane pressures below 0.3 bar where achieved over production cycles in excess of 50 h. Treatment efficiencies in general showed 95% colour removal, 85% UV removal, 6575% TOC removal and 95% of true colour, 87% of UV-absorbing compounds, and 6575%

6、of DOC. A consistent high permeate quality was achieved for all experiments irrespective of operating modes investigated. Initial studies with dead-end operation and variations of backwashing and air scouring showed that membrane fouling was reversible and primarily cake formation. This cake layer was easily re- moved when the membrane was cleaned extensively and the membrane performance was returned to its initial state. The performance of the membrane system was found to be best