Hazen & Sawyer, P.c.

Robert E Fergen

A method is provided for improving the dewatering and odor reduction characteristics of a liquid wastewater sludge, sediment, or soils to ultimately form a dewatered solid residual that includes nutrition enhancement of a resultant material that is suitable for distribution and marketing, and for incorporation in a fertilizer blend. The material meets Class A pathogen reduction by achieving disinfecting conditions. The method includes the addition of selective acids and bases to the liquid sludge which forms insoluble precipitates, and enmeshes the solids in the sludge to form a granular product. The method's applicability includes municipal, agricultural, food processing, industrial liquid and semi-liquid sludges, sediments, and soils.

Chemical conditioning of liquid and semi-liquid sludge for dewatering,

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. The mixture is placed within a confined volume to maintain the temperature at or above 55.degree. C. for at least two hours. The mixture can be dewatered for a higher percent solid characteristic. The material is then tested and if test results indicate, the material is approved by the Environmental Protection Agency for human contact. The biosolid materials are suitable for general nutrient values with minimal regulatory restriction and other beneficial uses.

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Raleigh, NC, United States of America

Robert E Fergen