Document Detail

Biotreatment of H2S- and NH3-containing waste gases by co-immobilized cells biofilter.
MedLine Citation:
PMID:  11057594     Owner:  NLM     Status:  MEDLINE    
Gas mixture of H2S and NH3 in this study has been the focus in the research area concerning gases generated from the animal husbandry and the anaerobic wastewater lagoons used for their treatment. A specific microflora (mixture of Thiobacillus thioparus CH11 for H2S and Nitrosomonas europaea for NH3) was immobilized with Ca-alginate and packed inside a glass column to decompose H2S and NH3. The biofilter packed with co-immobilized cells was continuously supplied with H2S and NH3 gas mixtures of various ratios, and the removal efficiency, removal kinetics, and pressure drop in the biofilter was monitored. The results showed that the efficiency remained above 95% regardless of the ratios of H2S and NH3 used. The NH3 concentration has little effect on H2S removal efficiency, however, both high NH3 and H2S concentrations significantly suppress the NH3 removal. Through product analysis, we found that controlling the inlet ratio of the H2S/NH3 could prevent the biofilter from acidification, and, therefore, enhance the operational stability. Conclusions from bioaerosol analysis and pressure drop in the biofilter suggest that the immobilized cell technique creates less environmental impact and improves pure culture operational stability. The criteria for the biofilter operation to meet the current H2S and NH3 emission standards were also established. To reach Taiwan's current ambient air standards of H2S and NH3 (0.1 and 1 ppm, respectively), the maximum inlet concentrations should not exceed 58 ppm for H2S and 164 ppm for NH3, and the residence time be kept at 72 s.
Y C Chung; C Huang; C P Tseng; J R Pan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemosphere     Volume:  41     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-11-02     Completed Date:  2000-12-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  329-36     Citation Subset:  IM    
Science and Technology Information Center, National Science Council, Taipei, Taiwan, ROC.
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MeSH Terms
Air Pollutants / chemistry*
Ammonia / chemistry*
Filtration / instrumentation,  methods
Hydrogen Sulfide / chemistry*
Nitrosomonas / physiology
Thiobacillus / physiology
Waste Management* / methods
Reg. No./Substance:
0/Air Pollutants; 7664-41-7/Ammonia; 7783-06-4/Hydrogen Sulfide

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