Document Detail


Gaseous ammonia uptake in compost biofilters as related to compost water content.
MedLine Citation:
PMID:  17824284     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sewage sludge and yard waste compost were used as biofilter materials and tested with respect to their capacity for removing ammonia from air at different water contents. Ammonia removal was measured in biofilters containing compost wetted to different moisture contents ranging from air dry to field capacity (maximum water holding capacity). Filters were operated for 15 days and subsequently analyzed for NH3/NH4+, NO2-, and NO3-. The measured nitrogen species concentration profiles inside the filters were used to calculate ammonia removal rates. The results showed that ammonia removal is strongly dependent on the water content in the filter material. At gravimetric water contents below 0.25 g H2O g solids(-1) for the yard waste compost and 0.5 g H2O g solids(-1) ammonia removal rates were very low but increased rapidly above these values. The sewage sludge compost filters yielded more than twice the ammonia removal rate observed for yard waste compost likely because of a high initial concentration of nitrifying bacteria originating from the wastewater treatment process and a high airwater interphase surface area that facilitates effective ammonia dissolution and transport to the biofilm.
Authors:
Tjalfe G Poulsen; Ann H B Jensen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  57     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-09-10     Completed Date:  2007-10-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  940-6     Citation Subset:  IM    
Affiliation:
Environmental Engineering Section, Department of Chemistry, Biotechnology and Environmental Engineering, Aalborg University, Aalborg, Denmark. tgp@bio.aau.dk
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / chemistry*
Ammonia / chemistry*
Filtration
Gases / chemistry*
Refuse Disposal / methods
Sewage / analysis
Soil / analysis*
Time Factors
Water / analysis*,  chemistry*
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Gases; 0/Sewage; 0/Soil; 7664-41-7/Ammonia; 7732-18-5/Water

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


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