Document Detail


Autotrophic denitrification for combined hydrogen sulfide removal from biogas and post-denitrification.
MedLine Citation:
PMID:  12188569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this paper we describe an alternative flow-chart for full treatment of wastewaters rich in organic substrates, ammonia (or organic nitrogen), and sulfate, such as those generated in fish cannery industries. Biogas generated during anaerobic pretreatment of these wastewaters is rich in hydrogen sulfide that needs to be removed to enable application of the biogas. Nitrogen elimination is traditionally achieved by subsequent nitrification and denitrification of the effluent of the anaerobic reactor. Alternatively, the hydrogen sulfide in the biogas can be applied as an electron donor in an autotrophic post-denitrification step. In order to study whether sufficient hydrogen sulfide containing biogas for denitrification was produced in the anaerobic reactor, the biogas composition as a function of the anaerobic reactor-pH was estimated based on a typical wastewater composition and chemical equilibrium equations. It is demonstrated that typical sulfate and nitrogen concentrations in fish cannery wastewater are highly appropriate for application of autotrophic post-denitrification. A literature review furthermore suggested that the kinetic parameters for autotrophic denitrification by Thiobacillus denitrificans represent no bottleneck for its application. Initial experimental studies in fixed-film reactors were conducted with sodium sulfide and nitrate as an electron donor-acceptor couple. The results revealed that only moderate volumetric treatment capacities (< 1 g-NO3- N l(-1) day(-1)) could be achieved. Mass balances suggested that incomplete sulfide oxidation to elemental sulfur occurred, limiting biomass retention and the treatment capacity of the reactor. Future research should clarify the questions concerning product formation from sulfide oxidation.
Authors:
R Kleerebezem; R Mendez
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  45     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2002  
Date Detail:
Created Date:  2002-08-21     Completed Date:  2003-01-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  349-56     Citation Subset:  IM    
Affiliation:
University of Santiago de Compostela, Department Chemical Engineering, Chemistry Faculty, Spain.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Bacteria, Anaerobic / physiology*
Biofilms
Bioreactors*
Food Industry*
Gases
Hydrogen Sulfide / chemistry*
Industrial Waste
Kinetics
Models, Theoretical*
Nitrogen / metabolism*
Oxidation-Reduction
Paper
Sulfates / analysis,  chemistry
Thiobacillus / physiology
Waste Disposal, Fluid / methods*
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Gases; 0/Industrial Waste; 0/Sulfates; 7727-37-9/Nitrogen; 7783-06-4/Hydrogen Sulfide

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


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