NDLI: Phosphorus removal from anaerobically digested swine wastewater through struvite precipitation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Jordaan, E. M. Ackerman, J. Cicek, N.
Description	Country affiliation: Canada Author Affiliation: Jordaan EM ( Department of Biosystems Engineering, University of Manitoba, 75 Chancellors Circle, Winnipeg MBR3T2N2, Canada. umjordaa@cc.umanitoba.ca)
Abstract	Phosphorus removal from agricultural wastewater streams is an important aspect of managing surface water quality, due to the contribution of phosphorus to eutrophication. Removal of phosphorus through struvite precipitation allows for its recovery as a potential fertilizer, and by determining the best conditions for struvite precipitation the removal process can be optimized. The effects of pH, Mg:P ratio, and time on struvite precipitation from anaerobically digested swine manure effluent were investigated. Effluent with Mg:P ratios from 1.0:1 to 1.6:1 were adjusted to pH values between 7.5 and 9.5 and left to equilibrate for 24 h. Results indicate that phosphorus removal increased with increasing pH and Mg:P ratio; the maximum phosphorus removal achieved was 80% at pH 9.0 and a Mg:P ratio of 1.6:1. The purest struvite precipitate was found at pH 7.5, with calcium carbonate and struvite precipitating at higher pH values. A continuously stirred batch of centrate was adjusted to pH 8.4 to determine the struvite formation rate constant. The rate constant was found to be 1.55 h(-1), with 17% phosphorus removal during the first 20 min. The results indicate that struvite precipitation could be a viable method of phosphorus removal from anaerobically digested swine manure.
File Format	HTM / HTML
ISSN	02731223
Issue Number	12
Volume Number	61
e-ISSN	19969732
Journal	Water Science & Technology
Language	English
Publisher	IWA Publishing
Publisher Date	2010-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Magnesium Compounds Isolation & Purification Phosphates Phosphorus Waste Disposal, Fluid Methods Anaerobiosis Animals Bioreactors Calcium Analysis Magnesium Manure Swine Journal Article
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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