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.
Författare HANS ULMERT and ERIK SÄRNER
Nyckelord sludge treatment, aluminium recovery, water treatment.