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Title: Capacity expansion for regional wastewater systems
Authors: Ong, S.L. 
Adams, Barry J.
Issue Date: May-1990
Citation: Ong, S.L.,Adams, Barry J. (1990-05). Capacity expansion for regional wastewater systems. Journal of Environmental Engineering 116 (3) : 542-560. ScholarBank@NUS Repository.
Abstract: A simple yet effective approach is presented for solving regional wastewater treatment system capacity expansion problems. The approach decomposes a mode into two levels, upper and lower. The lower level treats the subproblems related to separate facilities of a regional treatment system. These subproblems are solved independently by dynamic programming. The upper level is used to coordinate the subproblems in the lower level and is updated using a random polyhedron search algorithm that identifies progressively superior solutions. Constraints imposed on treatment plant or transfer capacities are considered first, and then constraints relating to the in-stream quality of the receiving water are incorporated. The procedures developed are tested in a hypothetical problem with seven communities along a river and its tributary. The results obtained indicate that it is economically attractive to consider time-staging of capacity whenever possible. It is also observed that the model with in-stream quality constraints required more computational resources, the amount of which is somewhat dependent on the level of in-stream quality requirement imposed. However, the incremental computational, efforts required might not be excessive.
Source Title: Journal of Environmental Engineering
ISSN: 07339372
Appears in Collections:Staff Publications

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