The feasibility of using constructed wetlands systems for urban wastewater

Lieschke-Mercer, Yvette (2015) The feasibility of using constructed wetlands systems for urban wastewater. [USQ Project]

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Abstract

Constructed treatment wetlands are used globally to treat stormwater and a variety of wastewater for the effective removal of nutrients and pollutants. This technology is a proven method for water treatment and is gaining greater momentum in its application in Australia. The technology allows for reductions in construction and ongoing capital costs such as energy consumption as is seen in traditional wastewater treatment works. In addition, this technology can reduce the need for chemical dosing treatment of waste water management systems.

Treatment wetlands are a passive system capable of treating primary, secondary and tertiary effluent, however, predominantly they have been employed to treat wastewater beyond the secondary level, often referred to as effluent polishing (Kadlec and Knight, 1996). Treatment wetlands are more commonly applied to the treatment of stormwater runoff however are also effective for treating human wastewater, industrial, mining and agricultural effluent. The reuse and reclamation of treated waste water is gaining momentum especially in countries where water is or is becoming more of a scarce and expensive resource but will also provide a benefit in terms of environmental sustainability with respect to the health of our waterways and our water resources in general.

Investigation into the feasibility of a passive treatment system was undertaken for a large urban population to determine if civil costs, operational costs and EPA load based license fees have the potential to be reduced. Specifically the comparison of the efficacy of two types of constructed wetland systems was undertaken. A traditional constructed wetland and a floating treatment wetland were compared, as part of the treatment process for municipal wastewater to meet discharge limits and to determine which type of wetland has greater viability with regard to its actual footprint, land availability and also treatment efficiency. The Constructed Wetlands Manual (DLWC, 1998) as well as sizing methodology put forward by Kadlec and Knight (1996) and Reed et al. (1995) were utilised to determine wetland surface area.

Floating treatment wetlands appear to be the most feasible option in terms of land footprint and enabling the retrofitting of existing structures, however in terms of treatment efficiency and installation costs have resulted, in this study, not to be a feasible option or alternative to the current wastewater treatment systems for Bathurst Regional Council without further trials and being undertaken both in terms of refining the treatment efficiency and also investigations in how to reduce the capital costs of installing a floating treatment wetland.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Civil) project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Banhazi, Thomas Dafny, Elad
Date Deposited: 07 Jun 2016 01:09
Last Modified: 07 Jun 2016 01:09
Uncontrolled Keywords: Constructed Wetlands, Effluent Polishing, Floating Treatment Wetlands
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
URI: http://eprints.usq.edu.au/id/eprint/29270

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