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Complexing Agents in Waste Waters of Finnish Electrolytic and Chemical Surface Treatment Plants
Introduction
In the European Union, according to the council directive concerning integrated pollution prevention and control (IPPC96/61/EC), installations for surface treatment of metals and plastic materials using an electrolytic or chemical process where the volume of the treatment vats exceeds 30 m³ are subject to an environmental permit. New installations may not begin to operate without a permit issued in accordance with IPPC directive, while authorities were given eight years after the directive was brought into effect to ensure that existing installations operate in accordance with the requirements. In Finland this has been understood as the existing installations need to be permitted before the end of October, 2007.
One of the main principles of IPPC directive is that facilities must adopt the best available techniques. The emission limit values (ELV) and the equivalent parameters have to be based on the best available techniques, without prescribing the use of any specific technique or technology. To define the best available techniques (BAT), the European commission has published reference documents (BREFs) on the BAT concerning the industries that need an environmental permit in accordance with the IPPC directive. The BREF for the (electrolytic and chemical) surface treatment of metals and plastics was published on September 2005 (EU 2005).
Keywords: Complexing agents, NTA, EDTA, DTPA, IPPC, electro- plating, electrolytic and chemical surface treatment, heavy metals
Complexing Agents in Waste Waters of Finnish Electrolytic and Chemical Surface Treatment Plants