Vinnerås, Björn
- Institutionen för energi och teknik, Sveriges lantbruksuniversitet
- Sveriges Veterinärmedicinska Anstalt (SVA)
Sammanfattning
To close the loop of nutrients in a safe way, the loop of pathogens has to be broken. By sanitising organic fertilisers derived from faeces and manure, the first step in the disease transmission chain is broken. Two alternatives for this treatment, thermophilic composting and ammonia-based treatment, were evaluated and compared to storage treatment. Thermal composting of faecal matter and food waste resulted in a treatment temperature of over 65 degrees C in a 90 L reactor. By using insulation and turning the compost three times during the high temperature period, it is possible to ensure a 5 log(10) reduction of pathogens. Small scale composting of the same material indicated less efficient reduction of faecal bacteria at temperatures around 50 degrees C. In the chemical treatment tested, an addition of 3% N-NH3 increased the pH to above 9 within 1 h and resulted in a good reduction in the indicator organisms for bacteria (Salmonella spp. and faecal coliforms D-r < 0.7 days, Enterococcus spp. D-r < 3 days). Lower addition rates resulted in a longer treatment period needed. The storage period tested resulted in slow reduction of faecal coliforms, Salmonella spp. and Enterococcus spp. (c) 2006 Elsevier Ltd. All rights reserved.
Nyckelord
ammonia; composting; disinfection; faeces; sanitation
Publicerad i
Bioresource Technology
2007, volym: 98, nummer: 17, sidor: 3317-3321
Utgivare: ELSEVIER SCI LTD
SLU författare
UKÄ forskningsämne
Annan naturresursteknik
Livsmedelsvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1016/j.biortech.2006.07.011
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/52988