O & M Costs and Optimal Capacity Expansion

by Frank Pearson, (M.ASCE), Asst. Dir.; San. Engrg. Research Lab., Univ. of California, Richmond Field Station, Richmond, Calif. 94804,
Charles R. Scherer, Former Asst. Prof.; Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif. 94720,

Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 4, Pg. 619-633

Document Type: Journal Paper

Discussion: Sorooshian S. (See full record)
Closure: (See full record)

Abstract: O & M costs for wastewater facilities incurred at a particular load are likely to be higher for plants with greater excess installed capacity, since recommended O & M staffing levels are determined on the basis of design capacity rather than actual load. Consideration of off-design O & M cost margins in the sizing of capacity increments to handle an increasing load shows optimality to be associated with smaller increments than if off-design costs are ignored. Analytical methodology is presented for optimal sizing of increments for minimum total cost of capital and O & M, in the case of a load increasing linearly with time. a simplified dynamic programming framework set up for the same purpose can accomodate generalized load versus time schedules. Use of these two methods is illustrated by working an example problem to obtain the same result by each.

Subject Headings: Load bearing capacity | Dynamic loads | Professional societies | Wastewater management | Wastewater treatment plants | Building design | Load and resistance factor design |

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