Document Detail

Determining the feasibility of phosphorus recovery as struvite from filter press centrate in a secondary wastewater treatment plant.
MedLine Citation:
PMID:  18444078     Owner:  NLM     Status:  MEDLINE    
In this study, the workability of a pilot-scale, fluidized reactor was examined to determine effectiveness in removing, and recovering, phosphorus as struvite, from centrate at Lulu Island Wastewater Treatment Plant (LIWWTP), Richmond, British Columbia. The crystallization process was run continuously over a period of 5 months in two runs (Run 1 for 4 months and Run 2 for a month). In addition to efficient recovery of phosphorus as struvite, the study also investigated factors that affect the growth of struvite. Chemical analyses were conducted on the harvested struvite to determine its purity. Results showed that the reactor was capable of removing over 90% of phosphate and 4% of ammonia-nitrogen, with greater than 85% of the phosphate removed being recovered as harvestable struvite crystals. It was possible to achieve over 90% P-removal at a pH of 7.5; this is contrary to the information found in literature, which recommends that a higher pH (8.2-9.0) is required. Factors that affected phosphate removal were the operating pH, the reactor supersaturation ratio (SSR), the N:P and Mg:P molar ratios. Analysis of the harvested product showed that the crystals were composed of nearly pure struvite (96% by weight), with small amounts of calcium and traces of other metals. High resolution SEM pictures were taken of the inside of the crystals to determine the influence of Mg:P molar ratio on the compactness of the crystals.
Kazi P Fattah; Donald S Mavinic; Frederic A Koch; Cristina Jacob
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  43     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-04-29     Completed Date:  2008-09-22     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  756-64     Citation Subset:  IM    
Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada.
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MeSH Terms
Feasibility Studies
Filtration / methods
Hydrogen-Ion Concentration
Magnesium Compounds / chemistry,  isolation & purification*
Phosphates / chemistry,  isolation & purification*
Phosphorus / chemistry,  isolation & purification*
Waste Disposal, Fluid / instrumentation,  methods*
Reg. No./Substance:
0/Magnesium Compounds; 0/Phosphates; 15490-91-2/struvite; 7723-14-0/Phosphorus

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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