Improvements in and relating to Methods and Means of Purifying Sewage

摘要

1,190,076. Treating sewage. WIBAU WESTDEUTSCHE INDUSTRIE- und STRASSENBAU-MASCHINEN G.m.b.H. 1 May, 1967 [9 May, 1966], No. 19959/67. Heading C1C. An apparatus for treating sewage has sand separation and/or other mechanical prepurification, biological purification and sludge settlement with the necessary flows being developed solely by hydrostatic pressure differences.