Abstract
The organic materials in the effluent from activated sludge treatment have a high THM FP ·DOC-1 (as much as 25.5μg·mgC-1). The particular substrate as well as the soluble substrate are metabolized by microorganisms during the activated sludge treatment. On the other hand, during the contact oxidation-biological filtration, the soluble substrate is metabolized by microorganisms, but the particular substrate is mainly removed by filtration. Therefore, it is assumed that the effluent from the contact oxidation-biological filtration contains a smaller amount of organic chloride precursor than that from the activated sludge treatment. This study was made to obtain the quantity of organic chloride precursor produced from the contact oxidation-biological filtration process. The results were as follows :
1) This process reduced the THM precursor, the total potential THM precursor and the TOX precursor to 52-65%, 45-50% and 37-46% of the original quantities, respectively. 2) THM FP·DOC-1 of the effluent from biological filtration was larger than that from the contact oxidation and the raw waste. There was a relationship between (CODCr-BODu) ·CODCr-1, THM FP·DOC-1, TOX FP·DOC-1 and consumed chlorine·DOC-1. 3) The range of THM FP·DOC-1 of the recalcitrant resulting from the contact oxidation-biological filtration was found to be from 13 to 19μg·mgC-1.
