Marleni, Ni Nyoman Nepi (2016) Impact of Water Management Practices in Residential Areas on Odour and Corrosion in Existing Sewer Networks. PhD thesis, Victoria University.

Abstract

Urban water systems in many developed cities are mostly stressed due to increased demand from population growth and an extended period of drought. The pressure on these systems has led to a number of adaptations such as the adoption of Water Demand Management and Alternative Water Sources. These adaptations are called Water Management Practices (WMP), which include Water Demand Management, Rainwater Harvesting, Greywater Recycling, Sewer Mining, and so on. These WMP lead to an increased uptake of residential rainwater, greywater or mixed wastewater for indoor and outdoor use and thus lead to water savings due to reduced imported water to study area. Besides the well-known benefits of water saving from adoption of WMP, many studies have found that the implementation of WMP reduces wastewater flow, hence causing sewer problems such as blockages, odour and corrosion. While the impact of WMP on sewer blockages has been investigated, the effects on sewer odour and corrosion are still largely unknown. Therefore, using WMP scenario analysis, this study will investigate the impact of WMP on odour and corrosion problems in sewer networks. Some scenarios developed in this study are 1) Base case, 2) Water Demand Management, 3) Greywater reuse/recycling, 4) Rainwater Harvesting, 5) Sewer Mining and 6) Combined Water Demand Management and Alternative Water Sources called as Sustainable Practice. A residential area was selected since the adoption of WMP is mostly conducted in households. A model was developed to simulate urban wastewater systems associated with sewerage pipe networks. The results show that Rainwater Harvesting scenario of RH-B is a comparatively more effective scenario than other WMP in reducing potable water demand and causing less impact on sewer odour and corrosion. RH-B reduced the total imported water to study area by 38% and increased the hydrogen sulphide concentration in sewer pipe by 6%. For the worst impact, there were two scenarios that were classified as worst scenarios, they are scenario of Greywater Recycling of GR-BL and Sustainable Practice of WDM-GR. GR-BL only reduced the imported water by 15% while increased hydrogen sulphide concentration by 40%. On the other hand WDM-GR reduced the total imported water by 46%, while increased hydrogen sulphide concentration by 62%. Scaling up the number of households adopted WMP also increased the risk of sewer odour and corrosion.

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