Thinking Outside the Engineering Box: Interactive Theme-Based Selection of Technologies for a New Urban Wastewater Treatment Plant

Description:Selection of wastewater treatment processes is often based on engineering-focused criteria such as influent wastewater characteristics, effluent discharge requirements, track record of proven technologies, ease of operation and maintenance of equipment, and site constraints. The design of the new Lions Gate Secondary Wastewater Treatment Plant adopted a theme-based mapping and interactive approach in selecting a preferred option from a long list of technologies for liquid stream treatment, solids management, and integrated resource recovery. The process selection framework involved collecting and bundling ideas from an integrated design team and stakeholders of diverse background to develop distinct concepts that feature relationships of the treatment facility with the community, natural environment, recoverable resources, and surrounding industries. Technologies were then linked to these thematic concepts for evaluation and trade-off analysis using technical, community-related, environmental, and economic criteria. This presentation will discuss how the decision-making framework led to the selection of treatment technologies for a 100 ML/d plant that meets multiple project goals while fitting onto a narrow 3-hectare site. Liquid treatment processes include compact lamella settlers, deep tank activated sludge, and stacked secondary clarifiers that can be adapted to meet future regulatory changes. Solids management strategies include thermophilic digestion to produce Class A biosolids and utilization of biogas for in-plant and off-site energy use. The design also incorporates reclaimed water tertiary filtration, sidestream deammonification, and two-stage odour control. This presentation will be of interest to decision makers, managers, and engineers who need to develop solutions for projects involving various stakeholders and multi-faceted objectives.

Authors: Joyce Chang

Subjects:

Tags:AC2014,2014 Annual Conference,AC14

Citation:Stream B. 2.2.

Publication Date:May 5th, 2014 Upload Date:Jul 15th, 2014

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