... 20,00 0-2 00,000 pe) in Colombia, Brazil and India (Alaerts et al., 199 0; Draaijer et al., 199 2; Schellinkhout and Collazos, 199 2; van Haandel and Lettinga, 199 4). Whereas the aerobic process achieves ... on Anaerobic Digestion, Bologna, International Association of Water Pollution Research and Control, London. van Haandel, A. C. and Lettinga, G. 199 4 Anaerobic Sewage Treatment. A Practical Guide ... Ultra- and micro-filtration (separation of colloidal and dissolved compounds). Table 3.12 Advantages and disadvantages of physicochemical treatment of domestic or municipal wastewater Advantages...