Advances in Water Treatment and Environmental Management, by G. Thomas

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Extra resources for Advances in Water Treatment and Environmental Management, Edition: New Ed

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The EEC Directive 80/778 tells us that “by pesticide and related product is meant: – insecticides, – herbicides, EUROPEAN DRINKING WATER STANDARDS 21 – fungicides, – PCB and PCT. It must be remembered that drafting of the directive 80/778 began in 1974/75 at a time when the only compounds investigated were organo-chlorinated and organo-phosporous pesticides, and often for the latter only these that respond to electron capture, which meant that it was possible to quantify all the compounds present with a single analysis.

The EQO defines the use for which the water is intended (eg abstraction for drinking water) whereas the EQS specifies the concentration of the substance which should not be exceeded to protect the particular use of the water. For example, in the Abstraction for Drinking Water Directive the EQS for nitrate is 50 mg/l. In the EC Dangerous Substances Directive environmental quality standards (EQSs) are described as environmental quality objectives (EQOs). This has led to confusion as quality objectives are viewed by those countries which opted for the limit value approach as long-term goals demanding very low standards and not as in the UK for setting consents for discharges.

Third Degree of Protection Benefits of the applied third degree of protection are: – all positive effects of both previous degrees of protection are included plus the following benefits: • return of the stream in its class as prescribed by the Regulations; • guaranteed possibility of using river for water supply of towns and industry with usual treatment only; • better organoleptic characteristics of water; • reduction of water quality deterioration in the distribution network. Fourth Degree of Protection Benefits of the applied fourth degree of protection are: Table 6.

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