Asrafuzzaman Md, Fakhruddin A N M, Hossain Md Alamgir
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
ISRN Microbiol. 2011 Dec 19;2011:632189. doi: 10.5402/2011/632189. Print 2011.
Turbidity imparts a great problem in water treatment. Moringa oleifera, Cicer arietinum, and Dolichos lablab were used as locally available natural coagulants in this study to reduce turbidity of synthetic water. The tests were carried out, using artificial turbid water with conventional jar test apparatus. Optimum mixing intensity and duration were determined. After dosing water-soluble extracts of Moringa oleifera, Cicer arietinum, and Dolichos lablab reduced turbidity to 5.9, 3.9, and 11.1 nephelometric turbidity unit (NTU), respectively, from 100 NTU and 5, 3.3, and 9.5, NTU, respectively, after dosing and filtration. Natural coagulants worked better with high, turbid, water compare to medium, or low, turbid, water. Highest turbidity reduction efficiency (95.89%) was found with Cicer arietinum. About 89 to 96% total coliform reduction were also found with natural coagulant treatment of turbid water. Using locally available natural coagulants, suitable, easier, and environment friendly options for water treatment were observed.
浊度给水处理带来了很大问题。在本研究中，辣木、鹰嘴豆和扁豆被用作当地可得的天然混凝剂，以降低合成水的浊度。使用传统的搅拌试验装置，以人工浊水进行试验。确定了最佳搅拌强度和持续时间。投加辣木、鹰嘴豆和扁豆的水溶性提取物后，浊度分别从100 NTU降至5.9 NTU、3.9 NTU和11.1 NTU，投加并过滤后分别降至5 NTU、3.3 NTU和9.5 NTU。与中浊度或低浊度水相比，天然混凝剂在高浊度水中效果更好。鹰嘴豆的浊度降低效率最高（95.89%）。对浊水进行天然混凝剂处理后，总大肠菌群也减少了约89%至96%。使用当地可得的天然混凝剂，观察到了适合、简便且环保的水处理选择。
