Abstract
The preparation of the Durban Metro Sewage Disposal Bylaws forced a closer investigation with respect to metals in the different sewer catchments in the then Durban Metro area. The status in 1999 found few Metal Finishing Industries complying with all environmental regulations and principles, high heavy metal concentrations in some of the sewage work sludges and illegal discharges of untreated heavy metal industrial effluents to the receiving environments. This paper describes the implementation and uses of hybrid pollution control techniques to regulate the metal finishing industries to reduce their environmental impact. The techniques used are a combination of environmental auditing tools, cleaner production, formation of and co-operation between industry associations and the local authority, waste minimisation groups, cost based incentives and structured enforcement of the bylaws and agreements. These techniques have been developed and used over the last four years, and have shown success in reducing the environmental impacts and improving relationships between industry and the municipality. This allowed for a better participative approach to setting new standards to be achieved and a more sustainable environment in which both the metal finishing industries and municipality can operate. Water SA Vol. 30 (5) 2005: pp.61-65
Highlights
Pollution control techniques In November 1996 the Durban Metropolitan Pollution Division was formed from several local authorities
Bylaws were promulgated creating a single legal standard to be used in the enforcement of the industries in the Durban Metropolitan Area
These bylaws set two uniform heavy metal discharge limits for all the sewage works in the Metropolitan Area based on the size of the sewage works
Summary
Pollution control techniquesIn November 1996 the Durban Metropolitan Pollution Division was formed from several local authorities. Pinetown, Amanzimtoti, New Germany, Tongaat, Verulam and DSB had to be enforced. Each of these bylaws had their own standards for heavy metal discharge limits to the corresponding wastewater treatment works. On the 13th of May 1999 the Durban Metropolitan Sewage Disposal. Bylaws were promulgated creating a single legal standard to be used in the enforcement of the industries in the Durban Metropolitan Area. These bylaws set two uniform heavy metal discharge limits for all the sewage works in the Metropolitan Area based on the size of the sewage works
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