Abstract: A water or wastewater purification process is described for reducing selenium and arsenic concentrations in contaminated water or wastewater streams. Iron loaded cation exchange resins, when contacted with contaminated water or wastewater streams are effective to form immobilized complexes with selenite and arsenate contaminants. The iron loaded resins can be easily regenerated by sequential treatment with acid and a solution of a soluble iron salt.

Abstract: Basic copper chloride having the empirical formula Cu(OH).sub.x Cl.sub.2-x is prepared from waste etchant streams. The compound exhibits properties that lends advantage to its use as a source of bioavailable copper in multinutrient fertilizer compositions. Novel fertilizer compositions for plant nutrition containing basic copper chloride as a bioavailable source of copper are described.

Abstract: The present invention relatess to a food product comprising a nutrient blend and a specified source of bioavailable copper. The present invention further relates to such a food product that is substantially free of soluble salts.

Abstract: A system and process are provided for treatment of cyanide-containing waste to form a substantially detoxified reaction product. The system comprises a reaction vessel, a heat exchange conduit extending through the reaction vessel to provide a flow path for heat exchange fluid, a heating loop for circulating heat exchange fluid through the heat exchange conduit at a temperature sufficient to initiate hydrolysis of cyanides in cyanide-containing waste to form the substantially detoxified reaction product, a cooling loop for circulating heat exchange fluid through the heat exchange conduit at a temperature sufficient to cool the substantially detoxified reaction product to a discharge temperature, and an apparatus for diverting flow of heat exchange fluid from the heating loop to the cooling loop.