Lagoon Effluent Treatment Using Grass Filtration
Publication: Journal of Environmental Engineering
Volume 129, Issue 11
Abstract
The Western Treatment Plant (WTP) is one of the largest treatment plants in Australia treating more than 500 ML of sewage per day, discharging treated effluent to Port Phillip Bay in Victoria, Australia. The Port Phillip Bay Environmental Study (1992–1996) concluded that there was a need to reduce nitrogen loads from WTP to lower the risk of eutrophication, especially during winter when grass filtration was in operation. Therefore, in 1997, Melbourne Water initiated a pilot study to investigate the effectiveness of grass filtration for polishing wastewater that had received prior lagoon treatment. The study involved field monitoring of seven trial grass filtration bays at the WTP for hydraulic and water quality data from mid-May to early-October 1997. The results of the pilot study revealed that the removal rates of these nutrients were higher during the first half of the trials than during the second half. The results also showed that the removal rates of nutrients were inversely proportional to the hydraulic loading rates of the bays. A hydraulic loading rate of 40 mm/d was found to be optimal in this pilot study for achieving a balance between wastewater throughput and nutrient removal.
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References
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 129 • Issue 11 • November 2003
Pages: 1022 - 1029
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Feb 28, 2002
Accepted: May 28, 2002
Published online: Oct 15, 2003
Published in print: Nov 2003
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