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  • Volume 5, Issue 1

Effective pathogen removal by low temperature thermal pre-treatment and anaerobic digestion for Class A biosolids production from sewage sludge

Daniel De los Cobos-Vasconcelos, María Elena Villalba-Pastrana, Adalberto Noyola
Published March 2015, 5 (1) 56-63; DOI: 10.2166/washdev.2014.036
Daniel De los Cobos-Vasconcelos
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico, DF, Mexico E-mail: ddeloscobosv@ii.unam.mx; dancob80@hotmail.com
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María Elena Villalba-Pastrana
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico, DF, Mexico E-mail: ddeloscobosv@ii.unam.mx; dancob80@hotmail.com
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Adalberto Noyola
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico, DF, Mexico E-mail: ddeloscobosv@ii.unam.mx; dancob80@hotmail.com
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Abstract

Production of Class A biosolids depends mainly on the effective control of thermotolerant coliforms and Salmonella spp. Thermal pre-treatment followed by anaerobic mesophilic digestion may be a simpler and more sustainable option to accomplish this compared with other process arrangements. In this work, removal and inactivation of thermotolerant coliforms and Salmonella spp. in waste municipal sludge were studied at three thermal pre-treatment conditions in batch tests (60, 70 and 80 °C). Effective removal was obtained with 70 °C and one-hour pre-treatment, but reactivation of both pathogens was noticed in the following step using an anaerobic mesophilic digester. Predictive microbial decay models (Weibull and sigmoidal-empirical) were used for fitting the experimental data. The sigmoidal-empirical model showed better results at the final counts, suggesting thermal adaptation of some microbial subpopulations. In order to overcome this unexpected result, the influence of the cooling phase was also studied applying three different conditions. For effective treatment, a fast cooling step (in this case, an ice-bath with sodium chloride) should follow thermal pre-treatment (70 °C and 60 min). At these conditions, no reactivation or re-growth of both pathogen indicators were seen during the following 48 h under anaerobic mesophilic digestion.

  • Class A biosolids
  • low thermal pre-treatment
  • pathogen reactivation
  • sewage sludge
  • First received 17 March 2014.
  • Accepted in revised form 23 August 2014.
  • © IWA Publishing 2015
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Journal of Water Sanitation and Hygiene for Development: 8 (1)
  Volume 5, Issue 1

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Effective pathogen removal by low temperature thermal pre-treatment and anaerobic digestion for Class A biosolids production from sewage sludge
Daniel De los Cobos-Vasconcelos, María Elena Villalba-Pastrana, Adalberto Noyola
Journal of Water Sanitation and Hygiene for Development Mar 2015, 5 (1) 56-63; DOI: 10.2166/washdev.2014.036
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Effective pathogen removal by low temperature thermal pre-treatment and anaerobic digestion for Class A biosolids production from sewage sludge
Daniel De los Cobos-Vasconcelos, María Elena Villalba-Pastrana, Adalberto Noyola
Journal of Water Sanitation and Hygiene for Development Mar 2015, 5 (1) 56-63; DOI: 10.2166/washdev.2014.036

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Keywords

Class A biosolids
low thermal pre-treatment
pathogen reactivation
sewage sludge
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