TREATMENT OF WASTE WATER BY AERATION WITH HIGH CONCENTRATION OXYGEN

摘要

PURPOSE:To effectively remove BOD components by feeding high concn. gaseous oxygen to the upper vapor phase part of a tightly sealed aeration tank and circulating the gaseous oxygen to carry out aeration. CONSTITUTION:Raw water 3 is introduced into an aeration tank 1 and mixed with concd. sludge from a reaeration tank 2. High concn. oxygen 8 is fed from a line to the upper vapor phase part of the tightly sealed aeration tank 1 and the fed oxygen is circulated to carry out aeration. BOD components in the water 3 are adsorbed on the sludge and simultaneously part of the components is decomposed by oxidation. Generated exhaust gas 7 is exhausted from the system through a line. The liq. mixture in the tank 1 is then sent to a settling tank 4 to separate treated water from the sludge. The treated water 5 is discharged from the system. The settled sludge is returned to the reaeration tank 2 through a return line 6. Thus, the concn. of dissolved oxygen in a liq. in the tank 2 can be kept high and waste water can be effectively treated.