Impacts of residence time during storage on potential of water saving for grey water recycling system
Grey water recycling has been generally accepted and is about to move into practice in terms of sustainable development. Previous research has revealed the bacteria re-growth in grey water and reclaimed municipal water during storage. However, in most present grey water recycling practices, impacts of water quality changes during storage on the system's performance and design regulation have not been addressed. In this paper, performance of a constructed wetland based grey water recycling system was analysed by taking the constraint of residence time during storage into account using an object based household water cycle model. Two indicators, water saving efficiency (WSE) and residence time index (RTI), are employed to reflect the system's performance and residence time during storage respectively. Results show that WSE and RTI change with storage tank volumes oppositely. As both high WSE and RTI cannot be achieved simultaneously, it is concluded that in order to achieve the most cost-effective and safe solution, systems with both small grey and green tanks are needed, whilst accepting that only relatively modest water saving efficiency targets can be achieved. Higher efficiencies will only be practicable if water quality deterioration in the green water tank can be prevented by some means (e.g. disinfection).
Copyright © 2010 Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Water Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Water Research, Volume 44 Issue 1 (2010), DOI: 10.1016/j.watres.2009.09.023
Vol. 44 (1), pp. 267 - 277
Place of publication
Showing items related by title, author, creator and subject.
Quantitative Assessment of Future Sustainability Performance in Urban Water Services using WaterMet² Behzadian, Kourosh; Kapelan, Zoran; Morley, Mark S.; Govindarajan, Venkatesh; Brattebø, H.; Sægrov, S.; Nazari, S.; Jamshid Mousavi, S. (IWA Publishing, 2015)Urban water services are likely to face challenges in the future, mainly due to population growth, climate change, increasing urbanization and ageing infrastructure. These factors are expected to impose significant strains ...
Behzadian, Kourosh; Kapelan, Zoran (Elsevier, 2015-04-27)This paper presents a new quantitative model called ‘WaterMet2’ for the metabolism based assessment of the integrated urban water system (UWS) performance. WaterMet2 quantifies a number of UWS flows/fluxes (e.g. water and ...
WaterMet2: a tool for integrated analysis of sustainability-based performance of urban water systems Behzadian, Kourosh; Kapelan, Zoran; Govindarajan, Venkatesh; Brattebø, H.; Sægrov, S. (Copernicus Publications for Delft University of Technology (TU Delft), 2014)This paper presents the "WaterMet2" model for long-term assessment of urban water system (UWS) performance which will be used for strategic planning of the integrated UWS. WaterMet2 quantifies the principal water-related ...