Measurement and modelling of quality changes in stored untreated grey water |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BU, UK;2. Department of Building and Environmental Health, Nottingham Trent University, Nottingham, UK;1. School of Arts, Sciences and Humanities, University of Sao Paulo, Av. Arlindo Bettio 1000, Sao Paulo, SP, 03828-000, Brazil;2. Graduate Program in Sustainability, University of Sao Paulo, Av. Arlindo Bettio 1000, Sao Paulo, SP, 03828-000, Brazil;1. Department of Civil Engineering, Rajarambapu Institute of Technology, Rajaramnagar, Islampur, 415414 District Sangli, M.S, India;2. Department of Civil Engineering, Walchand College of Engineering, Sangli 416415, M.S, India;1. Department of Civil Engineering, Environmental and Public Health Microbiology Lab (EPHM LAB) and Cooperative Research Centre for Water Sensitive Cities, Monash University, 3800 Victoria, Australia;2. Department of Civil Engineering, and Cooperative Research Centre for Water Sensitive Cities, Monash University, 3800 Victoria, Australia;1. Department of Civil Engineering, Karunya Institute of Technology and Sciences, Coimbatore 641114, Tamil Nadu, India;2. Water Institute, A Centre of Excellence, Karunya Institute of Technology and Sciences, Coimbatore 641114, Tamil Nadu, India;3. Department of Chemistry, Karunya Institute of Technology and Sciences, Coimbatore 641117, India |
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| Abstract: | This paper describes an investigation into stored untreated grey water quality processes and the development of a computer simulation for those processes. A laboratory study was carried out to investigate the changes in water quality with increasing residence time, and the results were used to calibrate and verify the model. Model results gave a good fit for dissolved oxygen (DO) concentrations, but only a reasonable fit for chemical oxygen demand (COD). Still, the main trends of model and laboratory COD data were broadly represented. Measurement and model results tend to confirm the initial hypothesis of four major processes in operation: settlement of suspended solids, aerobic microbial growth, anaerobic release of soluble COD from settled organic matter and atmospheric reaeration. Storing grey water for 24 h may significantly improve water quality through rapid settlement of organic particles, however, storage beyond 48 h leads to depleted DO levels and potential aesthetic problems. A more detailed model of COD fractions within grey water (with the relevant measured data) in conjunction with a characterisation of particulate settling velocities should lead to improvements in model predictions. |
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