A.F.M. van Velsen

Anaerobic digestion of piggery waste

A.F.M. van Velsen, A. Velsen, 1977 .

The application of the UASB-reactor for the direct treatment of domestic wastewater under tropical conditions

Gatze Lettinga, A. Schellinkhout, G. Lettinga, 1985 .

Digestion of Animal Manure

Gatze Lettinga, A.F.M. van Velsen, 1981 .

Anaerobic digestion of piggery waste : The influence of detention time and manure concentration

A.F.M. van Velsen, A. Velsen, 1977 .

Feasibility of Anaerobic Digestion for the Direct Treatment of, and the Energy Recovery from Urban Wastes

Gatze Lettinga, S. W. Hobma, W. J. de Zeeuw, 1981 .

Anaerobic digestion of piggery waste. 2. Start-up procedure

A.F.M. van Velsen, A. Velsen, 1979 .