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Hygienisering av klosettvatten för säker växtnäringsåterförsel till livsmedelsproduktionen

Vinnerås, Björn (2005). Hygienisering av klosettvatten för säker växtnäringsåterförsel till livsmedelsproduktionen. Technical Report. Uppsala: (NL, NJ) > Department of Biometry and Engineering, Sveriges lantbruksuniversitet. Rapport. Miljö, teknik och lantbruk ; 2005:0

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To fulfil the government goal of sustainable food production, the nutrients taken from the fields as food has to be recycled. Today, the net loss of nutrients is compensated by addition of fossil plant nutrients, which are non renewable resources. At the same time, the wastewater nutrients cause eutrophication in the water recipients. The main contribution of plant nutrients to the wastewater is the toiletwater. By sorting the toiletwater it is possible to recycle clean nutrients to agriculture. In this project, the possibility to inactivate pathogens during storage of toiletwater was investigated. To improve the inactivation of pathogens different concentrations of urea and lime were added to the toiletwater. Additionally, the reduction in the surface layer and the bottom layer were compared. The trials were performed in a half filled 600m3 liquid manure tank, where ten two litre bottles with different additions of chemicals were used (Table S1). To the different bottles Salmonella, Enterococcus fekalie and E coli O157 correspongin to 7-8 log10 ml-1 were added. To a few of the trials was also Ascaris suum added. The number of organisms was counted at three ocations; at day 28, day 68 and day 102 after the start at June 2, 2004. After 68 days, no viable bacteria was found in U0,1K0B or in U0K0,05B. These two trials were the ones with the highest addition of urea (0.1%) and lime (0.05%), respectively. Ten weeks of treatment is thereby enough for finding no viable pathogenic bacteria. The survival of A suum was high, after 102 days of treatment were still 40% of the eggs viable in the highest addition of urea (0.1%). In the other trials where A suum was added did the viability stay at 60%. Enterococcus was the type of bacteria that survived the longest in the investigated material. Enterococcus is normally excreted in the faecal matter. Therefore, Enterococcus can be used as indicator for the treatment efficiency, regarding the reduction of pathogenic bacteria in the toiletwater. The cost of treatment for the used chemicals is low as the used chemicals are not consumed during the treatment. The treatment is actually increasing the fertilising value of the treated material at the same time as a hygienically safe fertiliser is produced.

Authors/Creators:Vinnerås, Björn
Title:Hygienisering av klosettvatten för säker växtnäringsåterförsel till livsmedelsproduktionen
Series Name/Journal:Rapport. Miljö, teknik och lantbruk
Year of publishing :2005
Number of Pages:18
Place of Publication:Uppsala
Publisher:Institutionen för biometri och teknik, Sveriges lantbruksuniversitet, Statens Veterinärmedicinska Anstalt
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Keywords:Klosettvatten, svartvatten, hygienisering, salmonella, ammoniakhygienisering
Permanent URL:
ID Code:3801
Department:(NL, NJ) > Department of Biometry and Engineering
Deposited By: Erica Lövgren
Deposited On:30 Sep 2009 00:00
Metadata Last Modified:02 Dec 2014 10:24

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