In 2020 and 2021, the Symbiosis 4 Growth project will be continued in Zeeland and West and Midden-Brabant. This project is based on linking industrial waste or residual streams offered by companies in S4G work sessions with suitable customers, upgraders or re-users.

Project manager
September 2020 to September 2021

However, affordable, environmentally friendly re-users are not always immediately available for many of the residual substances offered in sessions. This is why Avans seeks local/regional customers/partners for the residual streams offered who want to develop a methodology/technology for reusing the substances in question, who can help solve legal issues and/or who can contribute to a circular solution in some other way. Relevant experts in the Avans study programme, other educational institutions, market parties and students are involved in the elaboration of these solutions.

Case study 1: Application of water treatment sludge

Large quantities of water (primarily washing water and process water) are used in processing potatoes into final products. Washing and process water that is not reused is treated in a waste water treatment unit. The treatment sludge is transported to a sludge processor where it is burned, although this is not perceived as a fully sustainable route. This is all the more so because the use of the treatment sludge as manure/soil improver in the agricultural sector might be an option. The application of agro-industrial treatment sludge from the potato industry in arable farming is, however, not feasible at the present time because of the requirements in place regarding various contaminants, including heavy metals. What are the options for making treatment sludge suitable for agriculture?

Research is being carried out into the possibilities/technologies for removing heavy metals from treatment sludge, or reducing their levels, so that it is suitable for application.

Case study 2: Valorisation of lemons

Lemons are used for the production of limoncello but the yellow peel of the lemon is the only part needed and what is left over is residual material.

Research is therefore being carried out on how the remaining parts of the lemon can be used in existing or new products in the region so that the residual material is minimised.

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