A method of treating wastewater biosolids by destruction of pathogens and indicator organisms to meet or exceed USEPA Process to Further Reduce Pathogens standards. The method first depresses the pH to below 5, followed by pH increase to 12 or higher, causing an exothermic reaction and heat of hydration....http://www.google.com.au/patents/US5385673?utm_source=gb-gplus-sharePatent US5385673 - Method of treating wastewater biosolids
