Document Detail

Treatment of high-strength pet food wastewater using two-stage membrane bioreactors.
MedLine Citation:
PMID:  16929635     Owner:  NLM     Status:  MEDLINE    
A two-stage membrane bioreactor was used to treat dissolved-air-flotation pretreated, high-strength pet food wastewater characterized by oil and grease concentrations of 50 000 to 82 000 mg/L and total chemical oxygen demand (COD) and five-day biochemical oxygen demand (BOD5) concentrations of 100 000 and 80 000 mg/L, respectively, to meet stringent surface discharge criteria (i.e., BOD5, total suspended solids [TSS], and ammonium-nitrogen [NH4(+)-N] of < 10 mg/L at an overall hydraulic retention time of 6.3 days). Organic contaminants were removed primarily in the first stage, followed by almost complete removal of ammonia in the second stage. Despite a rise in poorly biodegradable COD in the second stage, overall removal of TSS, BOD5, COD, and ammonia was 100, 99.9, 95.2, and 99.7%, respectively, thus readily achieving the required criteria. Consistent nitrite accumulation over a period of more than 100 days, even at dissolved oxygen concentrations of more than 2.5 mg/L, was remarkable. A residual alkalinity requirement for nitrification was quantified. Membrane performance was extensively studied in this work.
C Acharya; G Nakhla; A Bassi; R Kurian
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  78     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-08-25     Completed Date:  2006-12-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  661-70     Citation Subset:  IM    
Department of Chemical and Biochemical Engineering, University of Western Ontario, London, Canada.
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MeSH Terms
Animal Feed*
Animals, Domestic
Membranes, Artificial*
Nitrites / metabolism
Oxygen / metabolism
Waste Disposal, Fluid / methods*
Water Purification
Reg. No./Substance:
0/Membranes, Artificial; 0/Nitrites; 7782-44-7/Oxygen

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