PURPOSE: To clean up biochemically polluted waste water of middle and high concn. without diluting the same by treating the waste water contg. org. polluting components of middle and low concn. in an anaerobic tank and an aerobic tank then adding the same to the waste water of middle and high concn. which is treated in the anaerobic tank.
CONSTITUTION: The waste water of middle and low concn. contg. org. pollutants such as waste water of fishery processing, waste water of night soil or the like is first supplied into the 1st conditioning and anaerobic tank 1 contg. anaerobic bacteria such as lactic acid bacteria or the like where the waste water is treated; in succession, the water is treated in the 1st aerobic tank 2 contg. aerobic bacteria such as zooglea bacteria. The treated water is treated together with the waste water having pollution of middle and high concn. treated in the 2nd conditioning and anaerobic tank 3 in the 2nd aerboic tank 4, whereafter the aerobic sludge is separated by settling in a settling and separating tank 5. The treated water is added to the waste water from the tank 1. The activity of the waste water in the tank 1, 3 and the tanks 2, 4 is increased and the treatment is made possible without diluting the waste water having the pollution of middle and high concn.
MASUZAWA HIROYOSHI
IIKAWA SOUJI
OYAMA KENJIROU
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