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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Bibliographic Details
Published inWater science and technology Vol. 23; no. 7-9; pp. 1563 - 1572
Main Authors Narasiah, K S, Morasse, C, Lemay, J
Format Journal Article
LanguageEnglish
Published London IWA Publishing 01.01.1991
Subjects
Aeration
Alum
Case studies
Chemical oxygen demand
Chloride
Coagulants
Efficiency
Effluents
Ferric chloride
Flocculation
Household wastes
Laboratories
Lagoons
Nutrient removal
Phosphorus
Phosphorus removal
Polyphosphates
Precipitation
Water treatment
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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.
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