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South African Branch Conference at Johannesburg
Metropolitan and Southern Branch page
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activated sludge aeration aluminium chlorohydrate amount anaerobic authorities average B.Sc beds biological British Celanese cake calcium chloride capacity carried charge chemical chloride concentration considerable cost digested sludge dilution discharge disposal domestic sewage drainage effect efficiency elutriation engineers experiments factory film accumulation filter effluent filtration flocculation flow gal/cu gallons gas liquor grit Horsted Keynes humus increase industrial effluents industrial wastes installed Institute Johannesburg lime load ment method Minworth nitrification obtained operation outfall oxidation oxygen paper percolating filters pollution population possible present pressing problem produced pumping quantity radioactive radioisotopes raw sludge recirculation reduced removal retting river boards samples sand filters screens sedimentation tanks settled sewage sewage purification sewage treatment sewer sewerage sludge digestion South Africa Stoke-on-Trent stream surface surface-active material suspended solids synthetic detergents tion trade effluent trade waste treated treatment plant volume yd/day