Faculty of Engineering

Permanent URI for this communityhttps://rda.sliit.lk/handle/123456789/4203

Browse

Filters

2012 - 20162

Advanced Search

Filter by

Settings

Author: search.filters.author.Rathnayake, U. SSubject: search.filters.subject.Multi-objective optimization

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    PublicationEmbargo
    Review of binary tournament constraint handling technique in NSGA II for optimal control of combined sewer systems
    (Taylor & Francis, 2016-01) Rathnayake, U. S
    Binary tournament constraint handling technique in Non Sorted Genetic Algorithm II (NSGA II) has both advantages and disadvantages. This constraint handling technique is fairly simple; however, it solves the issues in identifying the penalty functions for multi- objective optimization problems. This paper reviews the constraint handling approach in NSGA II and compares it with an alternative constraint handling approach for optimal control of combined sewer systems. Interesting results are presented and it can be concluded that the alternative constraint handling approach produces better results; however, this alternative constraint handling approach has to be used with adequate care.
  • Thumbnail Image
    PublicationOpen Access
    Integrated Optimal Control of Urban wastewater Systems
    (2012) Rathnayake, U. S; Tanyimboh, T. T
    Sewer networks are designed to collect and transport wastewater to treatment plants. However, during wet weather periods stormwater runoff flows into these sewers and combined sewer overflows (CSOs) occur. Damage to the nearby natural waters from these CSOs is noticeable. This is because of the high pollution concentrations in CSOs. Controlling urban wastewater systems is one possible way of addressing the environmental issues from CSOs. Therefore, this research explores the development of a holistic framework that is intended to be used for the multi-objective optimization of urban wastewater systems, considering water quality in both sewers and receiving waters and the economics of wastewater treatment. Dry weather flows (DWFs) and stormwater runoff water quality compositions were considered. Temporal and spatial variations of the stormwater runoff were incorporated using pollutographs for different land-uses.