Rigorous controls on levels of mercury in drinking water and increased monitoring mandated by the Safe Drinking Water Act urged an investigation into practical treatment techniques for lowering mercury levels in water. Aqueous solutions of mercury were treated by various combinations of activated carbon, EDTA, tannic acid, citric acid, and calcium. Samples close to neutral pH allowed the most effective treatment; quite small additions of tannic acid dramatically increased treatment success, as did progressively higher concentrations of calcium ions.

The main objectives of this article were to present data on the characteristics of landfill leachate of Rhode Island Central landfill and those of Kuwait's Sulaibya landfill site, and to compare different experimental pilot plant studies for the treatment of sanitary landfill leachate, which was generally characterized by high concentration of heavy metals. The data obtained on the chemical analysis of leachate generated from two landfills in Rhode Island and Kuwait, identified variations in leachate quality due to landfill composition. Pilot Plant studies using physical/chemical and biological treatments (i.e., rotating biological contractor) were used to examine the treatment efficiency.

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