Effect of dissolved organic matter in urban wastewater on heavy metal speciation and trophic transfer

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Dissolved organic matter in municipal wastewater treatment plant effluent had higher conditional stability constant of zinc and copper complexation than natural humic substance. Addition of the organic matter to culture media induced lower zinc uptake by green algae as well as less trophically available zinc in algal cells. Consequently, it is suggested that zinc toxicity to the predator in the environment is reduced by the organic matter. Result of biodegradation and photodegradation tests showed the stability of the organic matter under river water environment in terms of complexation characteristics.