| Summary: | M.Sc. (Botany) === A comparison was made between the effectiveness of the biological filtering and activated sludge processes at the Johannesburg North Sewerage Works by making use of, inter alia, the physical-chemical and biological research methods. In addition to the standard physical and chemical analytical techniques, the biological growth potential technique, the lC method of determining primary productivity and biomass determination by way of the chlorophyll a method, were also used. The most important findings were: 1. that the activated sludge process purifies the water more effectively than the biological filtering process; 2. that no seasonal fluctuations affecting the effectiveness of the purifying systems were found, and 3. that the biological growth potential of the effluent in the Jukskei River was such that it could still cause algal growth. The primary recommendation is that tertiary purifying techniques will have to be employed in order to reduce The high phosphorous levels still prevailing in the effluent to comply with the requirements of the Water Act of 1984.
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