||Physical and Chemical Characteristics of Synthetic Asphalt Produced from Liquefaction of Sewage Sludge.
Donovan, J. M. ;
Batter, T. R. ;
Miller, R. K. ;
Lottman, R. P. ;
||Honolulu City and County Dept. of Public Works, HI.;Municipal Environmental Research Lab., Cincinnati, OH.
Sewage sludge ;
Physical properties ;
Chemical properties ;
Solid waste disposal ;
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Direct thermochemical liquefaction of primary undigested municipal sewage sludge was carried out to produce a low molecular weight steam-volatile oil, a high molecular weight synthetic asphalt, and a residual char cake. The latter product is capable of supplying the thermal energy requirements of the conversion process. The steam-volatile oil has immediate value as a synthetic fuel oil. The synthetic asphalt may prove to be a useful cement for paving with further research, or can be used as a fuel or coking stock. It is outwardly similar to petroleum asphalt, but chemically different. The thermochemical liquefaction process should be capable of operating technically and in an environmentally acceptable manner in conjunction with many existing waste-water treatment facilities. The overall feasibility of the process depends on the value of the oil and synthetic asphalt products as petroleum replacements, and on the costs associated with disposal of sludge. Projected economics indicate that the process has considerable promise for many potential sites in the United States at the present time.