Table of Contents
ISRN Microbiology
Volume 2011, Article ID 632189, 6 pages
http://dx.doi.org/10.5402/2011/632189
Research Article

Reduction of Turbidity of Water Using Locally Available Natural Coagulants

1Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
2Microbiology and Chemical Division, Dhaka Water Supply and Sewerage Authority (DWASA), Asad Gate, Mohammadpur, Dhaka 1207, Bangladesh

Received 8 August 2011; Accepted 20 September 2011

Academic Editor: G. G. Olinger

Copyright © 2011 Md. Asrafuzzaman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.