Date of Award
Doctor of Engineering Science in Civil Engineering
Civil and Environmental Engineering
John W. Liskowitz
Angelo J. Perna
Paul C. Chan
Richard B. Trattner
A sorbent treatment process has been developed which uses natural clay soils and fly ashes as sorbents in the treatment of the hazardous contaminants of potential sludge leachate emanating from industrial landfills. Natural sorbents (i.e., vermiculite, illite, kaolinite, zeolite, acidic and basic fly ashes) were evaluated for the removal of specific cations, anions, and organics from leachates generated from three industrial sludges (i.e., calcium fluoride, metal finishing, and petroleum). The laboratory results indicate that, rather than a single sorbent, a combination of acidic and basic sorbents in a layered system is required to reduce for the measurable contaminants present in the leachate to safe levels. These combinations are: illite, vermiculite and zeolite for an acidic leachate; illite, acidic fly ash and zeolite for a neutral leachate; and illite, kaolinite, and zeolite for an alkaline leach-ate. The selection of these sorbent combinations is based upon a comparison of their individual sorbent capacities.
pH control of leachate is essential for effective treatment. The removal of anions is favored by acidic conditions, cations by alkaline conditions, and the organic either by acidic or alkaline conditions. A study of a pilot scale lysimeter system reveals that the effectiveness of sorbents is dependent upon two factors, namely the velocity of leachate through the sorbent and the sorbent removal capacity for specific contaminants. The sorbent costs for a combined sorbent system used to treat the industrial sludge leachates are comparable to those of refined sorbents.
Sheih, Mung Shium Jack, "The use of natural sorbents for the treatment of industrial sludge leachate" (1979). Dissertations. 1249.