Nutrient Removal from Aerated Lagoons Using Alum and Ferric Chloride – A Case Study
Laboratory and on-site studies were conducted for over one year on an existing aerated lagoon treatment plant treating domestic wastes, the main objective being the removal of phosphorus. Two coagulants, namely alum and ferric chloride, were used throughout the study. It was confirmed during the stu...
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Published in | Water science and technology Vol. 23; no. 7-9; pp. 1563 - 1572 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
London
IWA Publishing
01.01.1991
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Subjects | |
Online Access | Get full text |
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Summary: | Laboratory and on-site studies were conducted for over one year on an existing aerated lagoon treatment plant treating domestic wastes, the main objective being the removal of phosphorus. Two coagulants, namely alum and ferric chloride, were used throughout the study. It was confirmed during the study that alum reacts preferentially with polyphosphates and not with orthophosphates in the precipitation process. Seasonal temperature variations do not appear to affect the coagulation and flocculation process adversely. The molar capacity of alum for precipitating the orthophosphate fraction is greater at secondary level of treatment compared with that at primary level. The phosphorus removal efficiency varied between 90 and 95 percent in case of both coagulants. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0273-1223 1996-9732 |
DOI: | 10.2166/wst.1991.0610 |