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Motivated by the difficulties and costs involved in sludge disposal, a laboratory study investigated a combined acidification-sulfide reduction method for recovering iron from water treatment plant sludge.

To measure traces of vanadium, which is sometimes associated with uranium milling, in waters of the Colorado River Basin, the authors devised a radiochemical activation analysis procedure. It confirmed that highest trace concentrations occur near milling activities.

In Denver, successive water use is being evaluated as a potential means of supplementing available water supplies. Evaluation of this potential encompasses a wide range of investigative areas including definitions of the legal, aesthetic, economic, and technical practicality of advanced treatment and reuse. The plan in Denver is to investigate all of these areas to assess their feasibility.

EPA, AWWA, and WPCF sponsored a workshop to define and establish priorities and provide direction for a potable reuse research program. This article highlights the conclusions and recommendations of the various workshop groups in dealing with the topics of wastewater treatment, treatment reliability and quality control, health effects associated with inorganic pollutants, organic pollutants, and biological pollutants, and socio‐economic considerations.