Improvements in or relating to the biological purification of waste water

摘要

1,001,136. Percolating filters. W. ALBERSMEYER. Sept. 12, 1962 [Sept. 14, 1961], No. 34795/62. Addition to 988,584. Heading B1D. The apparatus of the parent Specification is modified by the introduction of compressed air at spaced locations 15, 16 and 17 to prevent breakdown of the aerobic decomposition process during high rates of sewage flow.