IMPROVED TYPE ACTIVATED SLUDGE TREATMENT FOR PECTIN-CONTAINING WASTE WATER

摘要

PURPOSE:To convert the pectin in pectin-contg. waste water with which an activated sludge treatment is difficult to low molecules and to lower the COD concn. in the waste water simultaneously by using flocculatable pectin decomposing bacteria groups. CONSTITUTION:The bacteria having large pectin decomposing power are selected from the pectin decomposing bacteria belonging to filamentous fungus and are planted to the medium of a pectin substrate. Aerating-settling-releasing of the supernatant-adding of the medium are then repeated to generate the flocculated and settled pectin decomposing bacteria groups. After the pectin in the waste water of orange cans is converted to the low molecules by these pectin decomposing bacteria groups, the pectin is completely decomposed by the activated sludge treatment. As a result, the adsorption or intrusion of the high-polymer pectin into the activated sludge by failure in the decomposition thereof and the inclusion of such sludge into a sludge tank are prevented. The degradation in the BOD decomposing activity of the sludge is thus prevented and the concn. of the COD in the waste water of the orange cans is sufficiently lowered.