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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Inactivation of bacteria and viruses in human urine depending on temperature and dilution rate
Water Research, Volume 42, No. 15, Year 2008
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Description
Source separation and reuse of human urine can decrease the environmental pollution of recipient waters and reduce the need for artificial mineral fertilisers. However, the reuse of urine introduces another pathogen transmission route that needs to be managed. The inactivation of enteric pathogens and model organisms (Salmonella enterica subspecies 1 serovar Typhimurium (S. typhimurium), Enterococcus faecalis, bacteriophages S. typhimurium 28B, MS2 and Φ× 174) by urine storage was studied at dilutions (urine:water) 1:0, 1:1 and 1:3 at temperatures 4, 14, 24 and 34 °C. A threshold concentration of ammonia was found at approximately 40 mM NH3 (e.g. 2.1 g NH3-N L-1 and pH 8.9 at 24 °C), below which all studied organisms, except Salmonella, persisted considerably longer irrespective of treatment temperature, showing that urine dilution rate is of great importance for pathogen inactivation. For Salmonella spp. no threshold level was found in these studies (15 mM NH3 lowest concentration studied). At temperatures below 20 °C, bacteriophage reduction was very slow. Therefore, urine stored at temperatures below 20 °C carries a high risk of containing viable viruses. The study indicated that the current recommended storage time for urine of 6 months at 20 °C or higher is safe for unrestricted use and could probably be shortened, especially for undiluted urine. © 2008 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Vinnerås, Björn
Sweden, Uppsala
Sveriges Lantbruksuniversitet
Sweden, Uppsala
Statens Veterinärmedicinska Anstalt
Nordin, Annika Christina
Sweden, Uppsala
Sveriges Lantbruksuniversitet
Sweden, Uppsala
Statens Veterinärmedicinska Anstalt
Niwagaba, Charles Buregeya
Sweden, Uppsala
Sveriges Lantbruksuniversitet
Uganda, Kampala
Makerere University
Nyberg, Karin
Sweden, Uppsala
Statens Veterinärmedicinska Anstalt
Statistics
Citations: 145
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.watres.2008.06.014
ISSN:
00431354
Research Areas
Environmental
Genetics And Genomics
Infectious Diseases