Impacts of residence dime during storage on potential of water saving for grey water recycling system

WATER RESEARCH

卷:44

Article

Liu, S.¹  Butler, D.²  Memon, F. A.²  Makropoulos, C.²  Avery, L.³  Jefferson, B.⁴ 

[1] Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China

[2] Univ Exeter, Sch Engn, Ctr Water Syst, Exeter EX4 4QF, Devon, England

[3] Macaulay Inst, Aberdeen AB15 8QH, Scotland

[4] Cranfield Univ, Ctr Water Sci, Cranfield MK43 0AL, Beds, England

关键词: Grey water recycling;    Residence time;    Storage tank;    Water quality degradation;    Water saving;   

DOI  :  10.1016/j.watres.2009.09.023

来源: Elsevier

【 摘 要 】

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). (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

Free