Document Detail

A new process for enriching nitrifiers in activated sludge through separate heterotrophic wasting from biofilm carriers.
MedLine Citation:
PMID:  11995869     Owner:  NLM     Status:  MEDLINE    
A new process, the biofilm-activated sludge innovative nitrification (BASIN) process, consisting of a moving-bed biofilm reactor (MBBR) with separate heterotrophic wasting, followed by an activated-sludge process, has been proposed to reduce the volumetric requirements of the activated-sludge process for nitrification. The basic principle is to remove chemical oxygen demand on the biofilm carriers by heterotrophic organisms and then to waste a portion of the heterotrophic biomass before it can be released into the activated-sludge reactor. By this means, the amount of heterotrophic organisms grown in the activated-sludge reactor is reduced, thereby reducing the volume of that tank needed for nitrification. For nitrification applications, the simplest method for stripping biomass was to use an in-tank technique using high shearing rates with aeration. Bench-scale testing showed sludge yields in the BASIN process were one-half of that in a control activated-sludge process and twice that of a process line with intermediate settling between the MBBR and activated-sludge stage. Critical washout solids retention times for nitrifiers were the same for all three lines, so activated-sludge volumes for the BASIN process could be reduced by 50% compared with the control. Originally conceived process concepts for the BASIN process were confirmed by the experimental work.
Denny S Parker; Bjørn Rusten; Asgeir Wien; Jon G Siljudalen
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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:  74     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:    2002 Jan-Feb
Date Detail:
Created Date:  2002-05-08     Completed Date:  2002-10-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  68-76     Citation Subset:  IM    
Brown and Caldwell, Walnut Creek, California 94596-1220, USA.
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MeSH Terms
Bacteria / growth & development*
Biofilms / growth & development*
Bioreactors / microbiology
Carbon Dioxide / metabolism
Equipment Design
Nitrogen / metabolism
Oxygen Consumption / physiology
Quaternary Ammonium Compounds / metabolism*
Sewage / analysis,  microbiology*
Waste Disposal, Fluid / methods*
Water Microbiology
Reg. No./Substance:
0/Quaternary Ammonium Compounds; 0/Sewage; 124-38-9/Carbon Dioxide; 7727-37-9/Nitrogen

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

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