Document Detail

Evolution of temperature and chemical parameters during composting of the pig slurry solid fraction amended with natural zeolite.
MedLine Citation:
PMID:  15381214     Owner:  NLM     Status:  MEDLINE    
A 3-month experiment was conducted at a 300 kg scale to observe decomposition processes in pig slurry solids amended with two different doses of natural Slovak zeolite-clinoptilolite (substrates S1 and S2, 1% and 2% of zeolite by weight, respectively) in comparison with the control (unamended solids). The experimental and control substrates were stored outdoors in sheltered static piles at ambient temperatures ranging from 8.0 to 34.7 degrees C. The solid fraction (SF) of pig slurry was obtained by separation on vibration sieves prior to slurry treatment with activated sludge. The initial water content of the SF was 77.1% and no water was added to the piles during the storage. The temperature in the core of the piles was recorded throughout the experiment. By day 3 and 5 of storage (1% and 2% zeolite, resp.), the temperature in the substrates S1 and S2 exceeded 55 degrees C and remained above this level for 15 days while the highest temperature recorded in the control during the experiment was 29.8 degrees C. Samples from the core of the piles were taken periodically to determine pH, dry matter at 105 degrees C (DM), ash (550 degrees C/4 h), ammonia nitrogen (N-NH(4)(+)), nitrate nitrogen (N-NO(3)(-)), total nitrogen (N(t)), total phosphorus (P(t)); total organic carbon (TOC) was computed. The results showed that pH levels in S1 and S2 remained below that in the control for most of the thermophilic stage. This may be related to water-soluble ammonia and the affinity of zeolites to ammonium ions. A significant decrease in the level of ammonia nitrogen in water extracts from S1 and S2 was observed between days 5 and 35 in comparison with the control. The values of ash also differed and corresponded to the intensity of the decomposition processes in the respective substrates.
J Venglovsky; N Sasakova; M Vargova; Z Pacajova; I Placha; M Petrovsky; D Harichova
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Bioresource technology     Volume:  96     ISSN:  0960-8524     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2004-09-21     Completed Date:  2005-04-21     Revised Date:  2006-04-17    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  181-9     Citation Subset:  IM    
University of Veterinary Medicine, Research Institute of Veterinary Medicine, Hlinkova 1/A, 04001 Kosice, Slovak Republic.
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MeSH Terms
Ammonia / chemistry
Carbon / analysis
Hydrogen-Ion Concentration
Manure* / analysis
Nitrates / chemistry
Nitrogen / analysis
Phosphorus / analysis
Refuse Disposal / methods
Waste Management / methods*
Zeolites / chemistry*
Reg. No./Substance:
0/Manure; 0/Nitrates; 0/Soil; 12173-10-3/clinoptilolite; 1318-02-1/Zeolites; 7440-44-0/Carbon; 7664-41-7/Ammonia; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen

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