Conceptual planning and designing of a greywater recycling system for a nursery house and a daycare centre in Karagwe, Tanzania

Abstract

Engineers without Borders (EWB) Finland started a project to plan, conceptualize and design a nursery centre and a daycare centre in Kayanga, Tanzania. During the planning phase, EWB Finland was informed about inconsistent water supply in the area of the site.Hence, this thesis was designed to overcome the insufficiency of water in the site location.

The presumed value of water consumption for the site indicated a large percentage of greywater generation that are usually drained down the drainage along with the blackwater. Therefore, the main objective of this thesis was to study the feasibility of recycling greywater generated in the nursery to be used for non-potable uses. The report provides a design of a conceptual treatment system that aims at recycling greywater generated from only hand basin to be used for toilet flushing. The system is designed to treat the greywater through the method of sand filtration in addition with activated carbon filter. The treatment system in the design comprises of collection tank, sand filter tank, activated carbon filter tank and storage tank in the same order.

The design of the treatment system is approached by providing detailed background, specifications and calculations for each unit of the system. The calculations and design are based on the literature review and desktop study.