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Hygiene and sanitation requirements in Danish biogas plants

Abstract

According to Danish regulations, systematic pathogen reducing treatment is required, when industrial by-products and waste products, and urban waste, ie garbage from households and sewage sludge, are processed, before being used - without restrictions - as fertilizers on agricultural land. An adequate pathogen reducing effect (PRE) can be achieved in the digestion tanks and sanitation tanks of the biogas plants, provided they are operated correctly and respect the criteria of the official requirements. The FS-method is a microbiological indicator method based on faecal streptococci (enterococci) (FS). It may be used to check the sanitation effect achieved by the treatment in a tank. The effect is expressed numerically by the log{sub 10}-reduction of the numbers of FS measured in the biomass before and after treatment. The PRE was examined in 10 large-scale biogas plants during a period of 2-3 years. It was demonstrated that properly directed and well-functioning thermophilic digestion tanks ensure the removal of most pathogenic microorganisms from organic waste and slurry. The removal of pathogens by the treatment in mesophilic digestion tanks is incomplete. Systematic studies of the processes of inactivation of bacteria and virus in slurry and in animal tissues gave evidence that the PRE is enhanced in  More>>
Authors:
Publication Date:
Aug 01, 1997
Product Type:
Conference
Report Number:
NEI-DK-3077; CONF-9709214-
Reference Number:
SCA: 096000; PA: DK-98:001099; EDB-98:031742; SN: 98001920984
Resource Relation:
Conference: Workshop on the future of biogas in Europe 1997, Herning (Denmark), 8-10 Sep 1997; Other Information: PBD: Aug 1997; Related Information: Is Part Of The future of biogas in Europe 1997; Holm-Nielsen, J.B. [ed.]; PB: [143] p.
Subject:
09 BIOMASS FUELS; DENMARK; WASTE PROCESSING PLANTS; ORGANIC WASTES; CLEANING; POLLUTION ABATEMENT; REGULATIONS; PATHOGENS; HEALTH HAZARDS
OSTI ID:
579971
Research Organizations:
Sydjysk Univrsitetscenter, Esbjerg (Denmark). Biomasseinstituttet
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE98736994; ISBN 87-90074-12-2; TRN: DK9801099
Availability:
OSTI as DE98736994
Submitting Site:
DK
Size:
pp. 50-58
Announcement Date:

Citation Formats

Bendixen, H J. Hygiene and sanitation requirements in Danish biogas plants. Denmark: N. p., 1997. Web.
Bendixen, H J. Hygiene and sanitation requirements in Danish biogas plants. Denmark.
Bendixen, H J. 1997. "Hygiene and sanitation requirements in Danish biogas plants." Denmark.
@misc{etde_579971,
title = {Hygiene and sanitation requirements in Danish biogas plants}
author = {Bendixen, H J}
abstractNote = {According to Danish regulations, systematic pathogen reducing treatment is required, when industrial by-products and waste products, and urban waste, ie garbage from households and sewage sludge, are processed, before being used - without restrictions - as fertilizers on agricultural land. An adequate pathogen reducing effect (PRE) can be achieved in the digestion tanks and sanitation tanks of the biogas plants, provided they are operated correctly and respect the criteria of the official requirements. The FS-method is a microbiological indicator method based on faecal streptococci (enterococci) (FS). It may be used to check the sanitation effect achieved by the treatment in a tank. The effect is expressed numerically by the log{sub 10}-reduction of the numbers of FS measured in the biomass before and after treatment. The PRE was examined in 10 large-scale biogas plants during a period of 2-3 years. It was demonstrated that properly directed and well-functioning thermophilic digestion tanks ensure the removal of most pathogenic microorganisms from organic waste and slurry. The removal of pathogens by the treatment in mesophilic digestion tanks is incomplete. Systematic studies of the processes of inactivation of bacteria and virus in slurry and in animal tissues gave evidence that the PRE is enhanced in the microbiological environment of thermophilic digestion tanks. The sanitation criteria, ie combinations of temperature/time, for the processing of biomass in digestion tanks and sanitation tanks in biogas plants are specified. (au) 19 refs.}
place = {Denmark}
year = {1997}
month = {Aug}
}