Moringa oleifera-derived coagulants for water treatment: Floc structure, residual organics, and performance trade-offs
Moringa oleifera-derived coagulants for water treatment: Floc structure, residual organics, and performance trade-offs
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用于水处理的辣木衍生混凝剂：絮体结构、残留有机物和性能权衡
DOI：
10.1007/s11356-022-19071-8
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发表时间：
2022
影响因子：
5.8
通讯作者：
Tarabara, Volodymyr V.
中科院分区：
文献类型：
--
作者：
Murali, Akshay;Hillstead, Kyle D.;Wrobel, Brendan S.;Thomas, Daniel J.;Gonety, Romuald;Tarabara, Volodymyr V.
研究了辣木种子粗提物作为水处理混凝剂的适用性。凝结剂是通过将粉碎和筛分的种子浸泡在低盐度水溶液中获得的：在缺乏专业知识和设备的环境中，这是一种简单而廉价的常规凝结剂替代品。M.根据浊度去除、噬菌体清除、残留有机物的浓度以及元参数如絮凝物尺寸和分形维数来量化来自于oleifera的混凝剂。在最佳混凝剂剂量（14.7 mg（DOC）/L）和絮凝混合条件（= 22.4 s-1）下处理高浊度粘土悬浮液去除了> 94%的浊度，类似于用明矾的参考试验中记录的浊度。絮凝体的尺寸分布转移到较大的尺寸在第一个10分钟的絮凝没有变化之后，而絮凝体的分形维数，，继续增加，指向逐渐形成的更密集（= 2.1至2.2），更容易沉降的絮凝体。用MS 2噬菌体进行的初步试验表明，M. oleifer使活MS 2滴度降低~ 1.3 log，这显著高于浊度去除（~ 1 log）。然而，萃取过程允许大量的残留有机物（萃取DOC的> 78%）进入处理过的水中。建议将混凝剂与下游过滤和吸附相结合，采用紫外线或太阳能消毒，或将应用限制在非饮用水重复使用，以减轻与残留DOC相关的问题。
The study explored the suitability of unfractionated extracts from the seeds of theMoringa oleiferatree as a coagulant for water treatment. The coagulant was obtained by soaking crushed and sieved seeds in a low salinity aqueous solution: a simple and inexpensive alternative to conventional coagulants in settings where specialized expertise and equipment are lacking. The performance ofM. oleifera-derived coagulants was quantified in terms of turbidity removal, bacteriophage clearance, concentration of residual organics, as well as meta-parameters such as floc size and fractal dimension. Treating high turbidity clay suspensions at the optimal coagulant dosage (14.7 mg(DOC)/L) and flocculation mixing conditions (= 22.4 s−1) removed > 94% of turbidity, similar to that recorded in reference tests with alum. Floc size distribution shifted to larger sizes during the first 10 min of flocculation with no change afterwards, while the floc fractal dimension,, continued to increase, pointing to the gradual formation of denser (= 2.1 to 2.2), more settleable flocs. Preliminary tests with MS2 bacteriophage showed that coagulation withM. oleiferadecreased the viable MS2 titre by ~ 1.3 log, which was significantly above the turbidity removal (~ 1 log). The extraction process, however, allowed a large amount of residual organics (> 78% of extracted DOC) into the treated water. Combining the coagulants with downstream filtration and adsorption, employing UV or solar disinfection, or limiting applications to non-potable reuse is suggested for mitigating the concerns related to residual DOC.
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