While the City of Cape Town has already experienced a severe water crisis in 2018, other regions across the country are increasingly at risks of facing the same fate. At the same time, there are many people without access to laundry services such as residents from rural and informal settlements or homeless people. While there is an increasing demand for laundry services, the use of washing machines is often limited due to the lack of access to household water services and stable electricity supply.

With the aim to offer access to laundry services, and to enable a sustainable water and energy supply, the project aims to develop the LaundReCycle in order to address two topics:

• Enabling water and energy self-sufficiency: The LaundReCycle system is an autonomous unit that can be installed in places without direct freshwater, sewer or grid connection or in any region, where water is a restricted resource.
• Local community empowerment: The LaundReCycle offers educational opportunity, income generation, and economic growth potential for residents by i) offering training particularly for youth and females, ii) creating micro-enterprises and jobs along the value chain, iii) relieving residents of manual washing, in particular females, and therefore providing more time for income generation through other activities.

The project develops and improves the LaundReCycle in terms of technical, financial and operational performance. The LaundReCycle prototype in Switzerland tests the technical feasibility and main operational aspects before full transfer of knowledge to the South African partners for the construction of South African prototype in the City of Cape Town. The purpose of the prototype in South Africa is to analyse the operational performance and social aspects. Lastly, specific actions will be taken towards entering the market in South Africa.

The technology of the LaundReCycle is based on so-called "short-cycling system", where the wastewater of the washing machine is treated on-site and constantly reused for the same purpose, namely laundry. The system is based on a resource efficient low-tech approach and the exploitation of natural processes.

In a first step, the wastewater is mechanically pre-treated by separating solids and removing excess detergent from the wastewater. In a second step, the water is biologically treated in a trickling filter column and a green wall. Water losses are compensated through rainwater collection. The system is powered by a stand-alone photovoltaic system with battery storage.

The LaundReCycle prototype, also called "MODO", will host twice per week public laundry days starting May 7, 2022. Bring your dirty laundry and learn more about the eco-technology research. All other information can be found here: www.zhaw.ch/iunr/modo/en

Under the motto "Art & Science for Green Transition", the container of the LaundReCycle in Cape Town was artistically painted by a local artist on the themes of water, nature and the cooperation between Switzerland and South Africa. In addition, a painting workshop for children from under-resourced areas was held in the garden of the LaundReCycle. In a celebration for the local partners and invited guests, the artwork was inaugurated together with the Swiss Embassy.

As part of their bachelor theses, the two students Nastassja Koller and Pascal Hauser of the ZHAW Environmental Engineering degree program extended the LaundReCycle in Cape Town with a shower and hydroponic system. The wastewater from the shower is treated together with the wastewater from the washing machine in the LaundReCycle. Some of the treated water was used experimentally to irrigate the hydroponic and a vegetable bed. This brings the LaundReCycle one step closer to a completely decentralized and self-sufficient water system that not only produces clean water, but also provides sanitation connected to local food production.

Together with the Swiss Embassy and local partners, the pilot plant of the LaundReCycle was launched in Cape Town on January 29, 2021. With this step, the test phase in real operation started. Together with the NGO Khulisa, the LaundReCycle will be tested and further developed both technically and economically.

• Bernard Wessels