A comaprative perspective of US and UK thinking on e coli reactivation in digestion and dewatering

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Courtesy of Cambi AS

Presentation Outline
  • UK and US rules in Pathogens
  • History of Reactivation/Regrowth in US
  • WERF Projects
  • Correlation to odors
  • UK Situation
  • Conclusions

US and UK regulations

  • The USEPA regulations are mandatory
  • USEPA 503.15 The Class A pathogen requirements on 503.32 (a) or the Class B pathogen requirements in 503.32 (b) shall be met when bulk sewage sludge is applied to agricultural land, forest, a public contact site, or a reclamation site.

US and UK regulations

  • The Safe Sludge Matrix is a voluntary agreement between the UK water industry ADAS and the British Retail Consortium in order to ensure the highest possible food safety and gives retailers and the food industry unquestionable confidence that the use of biosolids on agricultural land is not only completely safe but also fully sustainable.
  • Gives ….. “clear guidance on the minimum acceptable level of treatment of any sewage sludge (often referred to as biosolids) based product which may be applied to that crop or rotation.

Timeline of the reactivation and regrowth issue

  • 2000 - A WWTP in North Carolina (digested product) converted to HS centrifuges
  • Immediately, odors increased, and testing of indicator organisms showed orders of magnitude increases
  • Generator felt compelled to stop land application, began landfilling
  • Restarted land application with supplemental liming, odor was still an issue

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