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Central University of Technology, Free State (2018)

Investigation of recycling perspectives of grey water for resource recovery in Witbank, South Africa

Yaka, Andile

Titre : Investigation of recycling perspectives of grey water for resource recovery in Witbank, South Africa

Auteur : Yaka, Andile

Université de soutenance : Central University of Technology, Free State

Grade : MAGISTER TECHNOLOGIAE : CIVIL ENGINEERING 2018

Résumé
South Africa is a water scarce country. The demand for water is exceeding the supply significantly in some of the cities of the country. Simultaneously, a significant amount of grey water is generated by the households in the cities. Consequently, an argument has emerged that if grey water is treated and re-used for domestic use purposes, then it can contribute to the alleviation of the challenges to meet the water demand. Besides, grey water also constitutes significant amount of resources such as Nitrogen, Phosphorous and Potassium. Therefore, a study was done by considering the city of Witbank of the Mpumalanga Province in South Africa in order to examine the quality (impurities and nutrient content) of grey water generated in the study area, explore the appropriate treatment processes to treat the grey water to and to quantify the availability of Nitrogen, Potassium and Phosphorus so that resources such as water and chemical resources (Nitrogen, Potassium and Phosphorus) can be recovered from grey water. The study was motivated by the need to reduce the high demand for scarce fresh water and the amounts of generated waste water, and a resource recovery through recycling process can ease the pressure on the environment. Grey water from bathrooms, showers, kitchens, laundry and sinks were collected from domestic water users of Witbank Mpumalanga Province, based on the location of the area such as central areas, upscale development and township of the city Witbank. Grey water samples were collected across the four seasons of the year and analysed in the laboratory for physical, chemical, operational, microbiological and resource content before and after treatment processes using various treatment combinations such as aerobic screening (AS), Multimedia Filtration (MMF), Ultraviolet radiation (UV) and Chlorination (CL). After treating grey water with a combination of MMF, AS and UV, the physical, chemical, operational and microbiological characteristics of grey water are compared with the standards recommended by the Department of Water Affairs and National Standards Specifications of South Africa. Also, a household survey targeting areas of Witbank as water users was carried out to collect household data relating to socio-economic characteristics and water demand, water supply scenarios. The data collected was statistically analysed.

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