POND INSTALLATION FOR BIOLOGICAL PURIFICATION OF POLLUTED WASTE WATER

摘要

A set of ponds for the biological cleaning of sewage includes a first pond with an anaerobic deep zone for denitrification. The second pond receives an oxygen input for aeration by a roll-over type of circulation, resulting in an oxygen excess. From the outflow end, a part of the nitrite and nitrate contg. effluent is recycled to the inflow of the first pond and is mixed intensively with the raw sewage. The setting pond has a deep zone, preceded by an overflow, mixing chamber and semi-immersed partition to ensure that the inflow reaches the deep zone. A pipe and overflow shaft links it to the second pond which has across it a frame with aerators in the centre which enforce an ascending water flow resulting in a roll-over type of circulation.