The Role of Coagulation and Microfiltration in Seawater Pre-treatment

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Reem Shaheen, Edit Cséfalvay
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引用次数: 2

Abstract

Power industry needs make-up water in power plant processes to compensate for the constant water loss during work. Mediterranean Seawater samples are studied to obtain pretreated water to use as a feed for the desalination stage. A comparison of coagulation with two coagulants, namely Poly aluminum chloride and ferric chloride in a one wt% stock solution, followed by microfiltration, was evaluated to obtain an efficient pre-treatment method. The lowest dosage of PACl positively affected all the measured parameters, especially the total suspended solid content was reduced to below 10 mg/L. The addition of FeCl3 resulted in 2.5-times higher total suspended solid content (23.5±4.58 mg/L) than the initial value measured for seawater (10.8±1.03 mg/L). Considering the flux values, two-steps of microfiltration and the lowest dosage of PACl followed by microfiltration resulted in the same high flux (3500 L /(m2 h) at the initial stage and 2500 L/(m2 h) at the 90% recovery rate). The flux after FeCl3 dosage seemed to be the highest, but it should be emphasized that the flocs were filtered via two consecutive 5–13 μm microfiltration stages, so this flux is not entirely comparable with those measured in other cases. Considering the chloride concentration, after microfiltration without coagulation, it remained constant; using coagulants it showed a slight reduction (~4%). From environmental point of view, the two-steps of microfiltration is recommended to be used since no chemicals are required for the operation; it can provide a steady flux of the cleanest pretreated water based on total suspended solid content.
混凝与微滤在海水预处理中的作用
电力工业在发电过程中需要补充水来弥补工作过程中不断流失的水分。研究了地中海海水样品,以获得预处理水,用作海水淡化阶段的饲料。用聚氯化铝和氯化铁两种混凝剂在1 wt%的原液中进行混凝比较,然后进行微滤,以获得一种有效的预处理方法。最低用量的PACl对各测定参数均有正向影响,其中总悬浮固体含量降至10 mg/L以下。FeCl3的加入使总悬浮固体含量(23.5±4.58 mg/L)比海水初始值(10.8±1.03 mg/L)提高2.5倍。考虑通量值,两步微滤和最低PACl投加量后微滤可获得相同的高通量(初始阶段为3500 L/(m2 h), 90%回收率时为2500 L/(m2 h))。FeCl3投加后的通量似乎最高,但需要强调的是,絮凝体是通过连续两个5-13 μm微滤级过滤的,因此该通量与其他情况下的通量不完全可比。考虑氯离子浓度,微滤后不混凝,保持不变;使用混凝剂后,其含量略有下降(约4%)。从环保的角度考虑,建议采用两步微滤,因为操作中不需要化学物质;它可以根据总悬浮固体含量提供最清洁的预处理水的稳定通量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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