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Moringa oleifera f-sand Filters for Sustainable Water Purification
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1021/acs.estlett.7b00490 Boya Xiong , Bethany Piechowicz , Ziyuhan Wang , Rose Marinaro 1 , Emma Clement , Taylor Carlin , Adam Uliana , Manish Kumar , Stephanie Butler Velegol
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1021/acs.estlett.7b00490 Boya Xiong , Bethany Piechowicz , Ziyuhan Wang , Rose Marinaro 1 , Emma Clement , Taylor Carlin , Adam Uliana , Manish Kumar , Stephanie Butler Velegol
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The purpose of this work is to determine parameters for the design of a Moringa seed sand filter for water purification. Moringa oleifera seeds containing cationic antimicrobial proteins have been used as natural coagulants for the removal of turbidity; however, a low removal efficiency and high residual organic levels limit their applications. In this work, Moringa seed extracts were used to reverse the charge of sand (f-sand) to 10 mV at a seed dosage of 5.6 g of seeds/m2 of sand. This f-sand filter demonstrated ∼4 log removal of 1 μm polystyrene particles and >8 log removal of Escherichia coli compared to <0.1 log removal for bare sand. Enhanced removal for particles and E. coli was dominated by attractive electrostatic interactions. Clean bed filtration modeling predicts a sticking coefficient (α) of 0.8 for f-sand compared to a value of 0.01 for bare sand. This α was further validated under a wide range of filtration conditions. Preliminary scale-up analyses suggest a point-of-use f-sand filter that requires a very small amount of seeds annually. The outcome of this work presents the scientific basis for the design of a water purification solution for developing regions, requiring only locally available resources and no use of synthetic chemicals or electricity.
中文翻译：
辣木f砂滤池可持续水净化
这项工作的目的是确定用于水净化的辣木籽砂过滤器设计的参数。含有阳离子抗菌蛋白的辣木种子已被用作天然混凝剂，以去除浊度。然而，低去除效率和高残留有机物含量限制了它们的应用。在这项工作中，辣木种子提取物被用来以5.6 g种子/ m 2的种子剂量将沙子的电荷（f- sand）反转为10 mV 。该f沙滤池显示1μm聚苯乙烯颗粒的去除率约为4对数，而大肠杆菌的去除率则大于8 log相比之下，裸砂的去除率<0.1。吸引人的静电相互作用主导了对颗粒和大肠杆菌的增强去除。干净床过滤模型预测f沙的黏附系数（α）为0.8，而裸砂的黏附系数为0.01。该α在广泛的过滤条件下得到了进一步验证。初步扩大规模分析表明点使用一个˚F -sand滤波器，每年需要种子的一个非常小的量。这项工作的结果为为发展中地区设计水净化解决方案提供了科学依据，该解决方案仅需要当地可用的资源，而无需使用合成化学品或电力。
更新日期：2017-11-29
中文翻译：
辣木f砂滤池可持续水净化
这项工作的目的是确定用于水净化的辣木籽砂过滤器设计的参数。含有阳离子抗菌蛋白的辣木种子已被用作天然混凝剂，以去除浊度。然而，低去除效率和高残留有机物含量限制了它们的应用。在这项工作中，辣木种子提取物被用来以5.6 g种子/ m 2的种子剂量将沙子的电荷（f- sand）反转为10 mV 。该f沙滤池显示1μm聚苯乙烯颗粒的去除率约为4对数，而大肠杆菌的去除率则大于8 log相比之下，裸砂的去除率<0.1。吸引人的静电相互作用主导了对颗粒和大肠杆菌的增强去除。干净床过滤模型预测f沙的黏附系数（α）为0.8，而裸砂的黏附系数为0.01。该α在广泛的过滤条件下得到了进一步验证。初步扩大规模分析表明点使用一个˚F -sand滤波器，每年需要种子的一个非常小的量。这项工作的结果为为发展中地区设计水净化解决方案提供了科学依据，该解决方案仅需要当地可用的资源，而无需使用合成化学品或电力。
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