Assessment of The Water Demand Management of Condominium Houses Considering Grey Water Reuse- The Case of Mickey Leland and Jemo Gara Addis Ababa, Ethiopia
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Date
2015-06
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Addis Ababa University
Abstract
Supply of adequate amount of water is one of the main challenges facing people that live in Addis Ababa in addition to water quality problems. Currently, it is becoming clear that developing new ground and surface water sources will not be enough to meet these challenges; it is therefore essential to reduce the water consumption, to substitute freshwater with alternative water resources and to optimize water use efficiency through reuse options. Among these alternatives grey water can be used to meet the anticipated deficit. In reality water demand in Addis Ababa exceeds water supply, the water demand in Addis Ababa city is about 736,816m3/day that exceeds the water supply which is about 376,186m3/day, therefore the water deficit is constantly increasing. Based on these facts, Addis Ababa Water and Sewerage Authority jointly to Addis Ababa Housing Construction Project Office need to adopt water demand management of condominium houses considering greywater reuse for efficient use of water.
This research entitle on the assessment of the water demand management of condominium houses considering grey water reuse within the general objective of developing a demonstrator of water demand management in view of grey water recycling based on appropriate piloting and decentralizing grey water treatment technology selection for existing and future construction condominium houses respectively.
Applied methodology consisted of two parts for new and existing condominium houses, in both of them collect secondary data from Addis Ababa Housing Construction Project Office, Addis Ababa Water and Sewerage Authority and reviewing literature from internet. For new condominium houses, using AutoCAD 2007 for separate system designing of grey water and black water riser diagram, laying out a water distribution network potable water and grey water recycling riser diagram; and using an open ended questionnaire surveys were conducted for interviewing professional engineers and managers with grey water recycling. On the other hand for existing condominium houses use closed ended questionnaire surveys were conducted in the cases of Mickey Leland condominium residences to identify the socio-cultural issues and using a barrel plastic piloting grey water treatment technology to know the effluent quality through laboratory test as a demonstrator.
The research result shows that the implementation of grey water reusing would save 376 m3 of potable water per day from Jemo Gara condominium houses with a 3 month payback period, 740.2 m3 of potable water per day from Mickey Leland condominium houses and 141,550.6 m3 of potable water per day from the existing and future condominium houses to flush toilets. The study also demonstrate the different possible socio-technical issues of grey water reuse as part of water demand management and the result shows 96% have a willingness to use the grey water recycling to replace potable water for toilet flushing. It was concluded that the grey water reusing has important, benefits and finding of water demand management of condominium houses to full fill the gap of the water supply and the water demand of the city and it is recommended that for implementing the grey water reuse systems Addis Ababa water and sewerage authority and Addis Ababa housing construction project office must be cooperate to ensure the success of any future water demand management program.
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Water demand management, Jemo Gara condominium houses