purification]. Chemisch Magazin 1993, september, p. 368-371
) Kumar, M. (1989). FAO agricultural services bulletin 79. Handbook of rural technology for the processing of animal by-products. Food and Agricultural Organization of the United Nations, Rome, Italy. p align="justify">) Kumar, M. (Undated). Waste disposal systems in slaughterhouses suitable for developing countries. FAO-report, Rome, Italy. p align="justify">) Lettinga, G., Velsen, A.F.M. van, Hobma, S.W. Zeeuw, W. de and Klapwijk, A. (1980). Use of the upflow blanket (USB) reactor concept for biological wastewater treatment, especially for anaerobci treatment. Biotechnology & Bioengineering, 22, 699 - 734. p align="justify">) Luppens, J. (1994). Personal communication. Stork Aqua, Lichtenvoorde, The Netherlands
) Mann, I. (1982). Animal by-products: processing and utilization. FAO agricultural development paper no. 75. Food and Agricultural Organization of the United Nations, Rome, Italy. p align="justify">) Metcalf & Eddy, Inc. (1991). Wastewater engineering. Treatment disposal re-use. Third Edition. McGraw-Hill, New-York. p align="justify">) Middlebrooks, E.J. (1979). Industrial pollution control. Volume 1: Agro-industries. Wiley-Interscience publication, John Wiley & Sons, New-York. p align="justify">) Milieu Magazine (1993). Thema Waterzuivering , augustus, 1993, p. 1-15
) Mulder, A. and Buijsen, H.J.J. van (1994). Bench-scale biological treatment of segragated streams of wastewater from leather tanneries. TNO Institute of Environmental Sciences, Delft, The Netherlands. p align="justify">) National Renderers Association (1990). Proceedings international animal nutrition symposium focusing on the use of animal by-products in animal feeds, National Renderers Association, Brussels. p align="justify">) Ockerman, H.W. and Hansen, C.L. (1988). Animal by-product processing. Ellis Horwood Ltd., Chichester, England. p align="justify">) Pearson, A.M. and Dutson, T.R. (1988). Edible meat by-products. Elsevier, London, England. p align="justify">) Pearson, A.M. and Dutson, T.R. (1992). Inedible meat by-products. Elsevier, London, England. p align="justify">) Pelckmans, H.H.A. and Koene, J.I.A. (1989). Rehabilitation of the institute for leather technology, Punjab, Pakistan. Report no 3. Institute for Leather and Shoe Research, Waalwijk, The Netherlands. p align="justify">) Pelckmans, H.H.A. (Undated). Milieuaspecten van de processen van de lederindustrie [environmental aspects of processes in the leather industry], TNO, Delft, The Netherlands. p align="justify">) Prandl, Von O., Fisher, A., Schmidhofer, T. and Sinell, H.J. (1988). Fleish: Technologie und Hygiene der Gewinnung und Verarbeitung. Eugen Ulmer GmbH & Co., Stuttgart, Germany
) Proceedings of the XXII International Da...
