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SEASONAL DISCHARGE: A SOLUTION FOR WWTP FOR MEETING PERMIT COMPLIANCE WHILE MAINTAINING RIVER WATER QUALITY

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Abstract:

The theory behind a seasonal or variable waste load allocation (WLA) program is that it employs different effluent standards (or mass limits) during different times of the year to take advantage of the variation in a receiving water's susceptibility to adverse impacts. Under a seasonal discharge program, a different set of effluent limits applies to each predefined period of the year, to a specified flow conditions, or to another parameter. While the basic theory of a seasonal discharge program is straightforward, the design of a program is relatively complicated with many factors that need to be considered in order to achieve the same degree of water quality protection as a non-seasonal discharge program. The “risk equivalent” condition is the condition under which the risk of water quality impairment of a seasonal discharge program is no greater than the risk of water quality impairment under a non-seasonal program.

Consideration of a seasonal or variable discharge framework is relevant to the development and implementation of total maximum daily loads (TMDLs) and associated waste load allocations (WLAs) for point source dischargers. This paper presents a discussion on the implementation of a seasonal discharge program and a case study evaluation of a seasonal discharge program for the Truckee Meadows Water Reclamation Facility (TMWRF), a major point source discharger in the Truckee River watershed.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864703784755003

Publication date: 2003-01-01

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