Design and Economics of Joint Wastewater Treatment

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Abstract
The writers feel that combined or joint industrial municipal treatment facilities offer an effective economical alternative to individual treatment systems for each waste. Certain pretreatment considerations may be required or desired to protect a combined biological system or to reduce the industrial surcharge. With regard to biological treatment, the completely mixed activated sludge or aerated lagoon systems, operated with single or multistate aeration basins, appear to be most amenable to combined effluents. Both the capital and operating costs associated with the combined facility should be allocated to industry and municipality on an equitable basis. Thus, flow, organic strength and suspended solids should be taken into consideration. Relationships presented herein offer examples of assigning the appropriate costs to the various users of the combined system.

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