A Pollution-Free System for the Economic Utilization of Municipal Solid Waste. Phase II. Detailed Design of Integrated System for the City of New York. Task VII. Pyrolysis versus Ocean Dumping of Sewage Sludge,

摘要

Pyrolysis versus ocean dumping of sewage sludge is examined as a means to dispose of municipal solid wastes in the City of New York. Pyrolysis results in cost reduction,energy recovery,and an environmental advantage compared to present procedures of ocean dumping. The process of pyrolysis involves the conversion of sewage sludge to a clean fuel gas and an inert,fused frit with a net production of energy. Heat treating the sludge eliminates the need for sludge digestion. Recommendations include prototype tests to validate a sludge dewatering process proposed in this report,plans for heat treatment and centrifugation units made in advance of plans for new sludge digestion facilities,and specific locations for centralized pyrolysis units. The basis for process design is the total system of eleven Water Pollution Control Plants which now use ocean dumping for the ultimate disposal of digested sewage sludge. For the purpose of comparing the proposed process of pyrolysis with ocean dumping,the respective capital and operating costs are roughly appraised.