L. D. Preez

Pilot-scale biological sulphate and nitrate removal utilizing producer gas as energy source

J. Maree, L. D. Preez, 1994 .

Biosolids management at 18 waste water treatment plants in South Africa - optimisation strategies

L. D. Preez, W. V. D. Merwe, J. Terblanche, 2000 .

Biological removal of sulphate from industrial effluents using producer gas as energy source

J. P. Maree, J. P. Odendaal, J. Maree, 1992 .