Categorical pretreatment standards

Series of programs for implementing EPA s categorical pretreatment standards. 

Effluent Guidelines and Categorical Pretreatment Standards 40 CFR Part 419... 

EPA has developed technology-based standards for industrial users of POTWs. Different standards apply to existing and new sources within each category. EPA has also developed Categorical pretreatment standards applicable to an industry on a nationwide basis. In addition, POTWs develop their own local limits, to assist in achieving the effluent limitations in their permits. 

Categorical pretreatment standards are limits on pollutant discharges to POTWs that apply to specified process wastewaters of particular industrial categories. These are found in the regulations at 40 CFR 403.6 and 40 CFR Parts 405-471. 

Pretreatment requirements for indirect discharges into POTWs must meet pretreatment requirements as set forth in 40 CFR 403.6 National Pretreatment Standards Categorical Standards. Effluent guidelines for direct discharges and pretreatment standards for specific chemical industry manufacturers and users are listed in the Code of Federal Regulations as follows ... 

The BS 2486 1978 water chemistry table for FT plants categorized boilers by FW hardness (unlike the 1997 revision, which charted by heat flux, and the ASME Consensus, which uses pressure to define boiler groups). This 1978 edition has been withdrawn by BSI. However, for the purposes of providing guidelines for those many thousands of smaller FT boiler plant owners around the world (especially those in newly industrializing countries) operating lower heat-flux units and without benefit of first-class pretreatment, it remains a valid standard. 

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