The ReAl Process – A COMBINED MEMBRANE AND PRECIPITATION PROCESS FOR RECOVERY OF ALUMINIUM FROM WATERWORK SLUDGE
The aim with this study has been to find a process which can recover aluminium from waterworks sludge. The separation processes used include acidification, ultrafiltration, nanofiltration and precipitation. The result of this study, which has been carried out over a period of three years, strongly indicates that it is technically possible to use acidification combined with membrane filtration for the recovery of Al3+ from waterworks sludge. The study also indicates that aluminium recovered by an additional precipitation process can replace virgin flocculation chemicals. In addition the recovery process will give positive environmental effects.