Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

105836 Influence of Temperature and Time on Pathogens Present in Biosolids Compost.

Poster Number 1333

See more from this Division: SSSA Division: Soils and Environmental Quality
See more from this Session: Soils and Environmental Quality General Poster

Tuesday, October 24, 2017
Tampa Convention Center, East Exhibit Hall

Marianne Fidalgo Faria, Soils and Environmental Resources, Universidade Estadual Paulista - UNESP, Botucatu, SP, BRAZIL, Irae Amaral Guerrini, Dept. Solos e Recursos Ambientais - CP 237, University of Sao Paulo, Botucatu, SP, BRAZIL, Roberto Lyra Villas Boas, Solos e Recursos Ambientais, FCA-UNESP, Botucatu, Brazil, Reinaldo José da Silva, Parasitology, Sao Paulo State University, Botucatu, Brazil, Vera Lucia Mores Rall, Microbiology and Immunology, Sao Paulo State University, Botucatu, Brazil, Caroline Mateus, Rua José Barbosa de Barros, 1780, Universidade Estadual Paulista - UNESP, Botucatu, BRAZIL and Rob Harrison, School of Environmental and Forest Sciences, University of Washington, Seattle, WA
Poster Presentation
  • POSTER SSSA Marianne.pdf (2.1 MB)
  • Abstract:
    The biosolids produced in large quantities by Wastewater Treatment Plants (WWTPs) are a residue which has its final destination still debated and questioned by the technical sector and also by the authorities. One of the main obstacles to the free land application of biosolids as an organic fertilizer and soil conditioner is in the presence of pathogens. Composting is an alternative for inactivation of these pathogens, allowing the agricultural use of biosolids. This study aimed to evaluate the decay of thermotolerant coliforms, Salmonella spp. and viable Ascaris spp. ova during a 45-day composting under increasing temperatures, which exceeded 65ºC, and decreasing moisture indexes over time. For Salmonella spp. it is possible to be concluded the absence on the most of the time of the evaluated composting process. The group of thermotolerant coliforms presented a considerable drop in the values observed after 20 days of study, when the temperature reached 65ºC. Viable Ascaris spp. ova could still be found, with no decreases, under temperatures up to 65º C, then its survival started decreasing until the end of the composting process, when no egg remained viable.

    See more from this Division: SSSA Division: Soils and Environmental Quality
    See more from this Session: Soils and Environmental Quality General Poster