Stressors Influencing Disinfection in Residuals
Abstract:The inactivation of pathogens in biosolids and residuals can be achieved to physical, chemical and biological stressors. The physical stressors include temperature, cavitation and radioactive irradiation (gamma and beta). The chemical stressors are associated with alkaline agents (raising the pH and causing exothermic reactions), acidic agents (lowering the pH and causing exothermic reachtions), oxidation and reduction agents (destroying organics and stabilization of uncharged disinfectants) and non-charged disinfectants (required to disinfect helminth eggs and bacterial spores). The biological processes result in the temperature increases greater than 52°C and result in the production of biocidal by-products such as organic acids, aldehydes and alcohols, which act as disinfectants. In general, biological residual treatment processes such as composting, anaerobic digestion, alkaline stabilization, lagoon storage and air drying, which involve multistressors factors and are generally more effective and economically viable.
Document Type: Research Article
Publication date: January 1, 2005
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