Treatment Costs Savings through Monthly Variable Effluent Limits

Seasonally variable effluent limits can provide substantial cost savings for municipalities that must provide advanced treatment to meet water quality standards. By estimating the 7-day, 10-year minimum streamflow (7Q10) for each month of the year, and using these values with monthly stream temperat...

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Bibliographic Details
Published in:	Journal - Water Pollution Control Federation Vol. 54; no. 8; pp. 1224 - 1230
Main Authors:	Reheis, Harold F., Dozier, Jack C., Word, David M., Holland, John R.
Format:	Journal Article
Language:	English
Published:	Water Pollution Control Federation 01-01-1982
Subjects:	Capital costs Cost estimates Cost savings Health care facilities Operating costs Savings Stream flow Wastewater Wastewater treatment Water quality
Online Access:	Get full text
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Summary:	Seasonally variable effluent limits can provide substantial cost savings for municipalities that must provide advanced treatment to meet water quality standards. By estimating the 7-day, 10-year minimum streamflow (7Q10) for each month of the year, and using these values with monthly stream temperatures and other water quality characteristics in a dissolved oxygen model, one can derive effluent limits for treatment facilities that will meet stream standards for each month. This technique gives the waste discharger more flexibility than the method of using only one model run at the "annual" 7Q10. This technique also makes it possible for many cities to discharge at secondary treatment for 4 or 5 months of the year, even if advanced treatment is required for other months. Capital costs are reduced; and Georgia's communities can save at least 5% per year in O & M costs by adapting treatment to seasonal variations instead of using a fixed level of advanced treatment year-round.
ISSN:	0043-1303