Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7482725 | Journal of Environmental Management | 2015 | 9 Pages |
Abstract
Chemical treatment of non-point derived pollution often suffers from undesirable oscillations in purification efficiency due to variations in runoff water quality. This study examined the response of the chemical purification process to variations in water quality using a 2k factorial design for runoff water rich in humic substances. The four k factors evaluated and the levels applied were: organic matter as dissolved organic carbon (DOC) (20-70Â mg/L), suspended solids (SS) (10-60Â mg/L), initial water pH (4.5-7), and applied coagulant dosage (ferric sulphate) (35-100Â mg/L). Indicators of purification efficiency were residual concentration of DOC, SS and total phosphorus (tot-P). Analysis of variance and factor effect calculations showed that the initial DOC concentration in raw water samples and its interactions with the coagulant dosage applied exerted the most significant influence on the chemical purification process, substantially affecting the residual concentration of DOC, SS and tot-P. The variations applied to the factors SS and pH only slightly affected purification efficiency. The results can be used in the design of purification systems with high organic matter load variation, e.g. peat extraction runoff.
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Elisangela Heiderscheidt, Tiina Leiviskä, Bjørn Kløve,