NDLI: Roughing filtration as an effective pre-treatment system for high turbidity water.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Khan, Zahiruddin Farooqi, Rahimuddin
Description	Country affiliation: Pakistan Author Affiliation: Khan Z ( Institute of Environmental Science & Engineering, Rawalpindi, Pakistan. zahirkhan61@gmail.com)
Abstract	Effective water treatment is the prime goal of every water treatment facility. Chakwal Water Treatment Plant in Pakistan has been treating high-turbidity surface water through crude coagulation, sedimentation and slow sand filtration since the early 1980s. The process has always been tedious in terms of high coagulant dosage, large volumes of sludge and short filter runs especially after wet spells. A laboratory-scale study was conducted to see if roughing filtration, as the pre-treatment process, would help in reducing coagulant dose and sludge volume and improving effluent quality. Results indicated that up-flow rouging filtration with media grades decreasing in the direction of flow could reduce wet weather raw water turbidity (by more than 90%) and coagulant dose. Overall, the plant could save over US \$54,000 annually in terms of coagulant cost only. Longer filter runs, improved product water quality leading to lower chlorine dose requirement, would be additional benefits.
File Format	HTM / HTML
ISSN	02731223
Issue Number	7
Journal	Water Science & Technology
Volume Number	64
e-ISSN	19969732
Language	English
Publisher	IWA Publishing
Publisher Date	2011-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Sewage Chemistry Water Purification Methods Filtration Waste Disposal, Fluid Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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