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Sanitation of faeces from source-separating dry toilets using urea.

Abstract：

AIM:To develop a reliable and simple method to produce safe fertilizers from human excreta using urea for sanitation of faeces. METHODS AND RESULTS:Urea was added to faecal matter (17% dry matter) at concentrations of 0.5-2% (w/w) and inactivation of Salmonella enterica subspecies 1 serovar Typhimurium (Salm. Typhimurium), Enterococcus spp. and the Salm. Typhimurium bacteriophage 28B was monitored at 14, 24 and 34 degrees C. Urea additions enhanced inactivation and inactivation rates were positively related to increasing NH(3) (aq) concentration and temperature. Salm. Typhimurium was the most sensitive of the organisms studied, while Enterococcus spp. showed more persistence, especially at lower temperatures. The bacteriophage was the most resistant organism studied. CONCLUSIONS:Salmonella reduction levels that meet requirements for safe reuse of faeces as fertilizer (i.e. 6 log(10) reduction) can be achieved for 1% urea within 2 months at 14 degrees C or within 1 week at 24 degrees C and 34 degrees C. SIGNIFICANCE AND IMPACT OF THE STUDY:The relationships between organism inactivation rates and temperature, ammonia and pH were identified. Urea treatment proved to be a robust and efficient option for safe recycling of plant nutrients.

journal_name

J Appl Microbiol

journal_title

Journal of applied microbiology

authors

Nordin A,Ottoson JR,Vinnerås B

doi

10.1111/j.1365-2672.2009.04339.x

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

1579-87

issue

5

eissn

1364-5072

issn

1365-2672

pii

JAM4339

journal_volume

107

pub_type

杂志文章

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