高度処理施設におけるリンの挙動

同時凝集法と嫌気好気法の特性

抄録

In “Clean Lake Suwa” which was the terminal treatment plant of the Suwa Lake river-basin sewerage facilities, the renewal to the advanced sewage treatment plant was examined from 1995. In the simultaneous precipitation process, Al/T-P mole ratio had to be made over 0.75 in order to do under discharge regulation T-P concentration 2mg·l^-1. And, it was anticipated that the Al/T-P mole ratio had to be done over 2 in order to do under desired value discharge T-P concentration 0.5 mg·l^-1 In the flocculant injection point, phosphorus elimination reaction rate is low. It was confirmed that the flocculant which intermingles with the return sludge was bringing about the effective phosphorus elimination reaction in aeration tank front stage. The anaerobic-aerobic activated sludge process applied to “Clean Lake Suwa” has not reached the phosphorus elimination performance of the goal. The shortening of SRT was attempted by the charge of the preliminary sedimentation basin sludge to the aeration tank. As a result, it was possible that it was improved, and effective SRT was able to be judged with under 8th. In addition, the phosphorus elution from the sludge was measured. Largest phosphorus elution amount of the simultaneous precipitation process sludge was 3.5mgP·gSS^-1. It was confirmed that the phosphorus elution amount was little. And, it was confirmed that Al which originates for the simultaneous precipitation process sludge affected phosphorus concentration in the supernatant by the anaerobic digestion process.