Acolumn I wrote several months ago about alkaline stabilization of septage spurred a few reader questions, so it’s a good time to revisit the use of lime for pathogen reduction, vector control and odors.To meet the pathogen reduction requirements to land-apply septage, the pH must be raised to 12 or greater and held for a minimum of 30 minutes. For grease traps where the grease is hauled to a municipal treatment plant, there are usually pH requirements for the material delivered to the plant. These requirements are a part of the federal National Pollutant Discharge Elimination System permit to operate
