Drinking water sludge formed by the production of drinking water from groundwater becomes unsuitable for reuse if high arsenic concentrations are present. To minimize waste generation and aiming for high valuable recuperation, this research aims to isolate the arsenic and recover the iron present in the sludge.

By means of biological processes the separation of arsenic and iron will be facilitated. Sequentially, a stable arsenic product is aimed to be formed that limits arsenic leaching. The iron will be mineralized in an iron mineral interesting for the industry.

Starting with proof of principle experiments, there will be worked towards the design and development of a sludge treatment reactor. Throughout the study knowledge will also be obtained regarding iron mineralisation, drinking water sludge composition, and arsenic adsorption/incorporation.