Load Fluctuation Countermeasures Using MLSS and ASRT Constant Control Method in Single-Stage Intermittent Aeration System.

SAKAI Yoshio, OHBA Shinji

doi:10.11532/proes1992.31.315

The amount of sewage that flows into waste water treatment plant, the quality of the sewage, and the pollution load (the product of first two) are not constant; rather, they undergo periodical changes within unit times such as one day, one week, or one year. It often happens that the difference between the maximum and minimum loads is very high at wastewater treatment plant located in sightseeing areas or industrial zones.<BR>Usually, wastewater treatment plant is designed to handle the maximum daily pollution load and is constructed accordingly. However, it is difficult to achieve constant a nd stable performance in the wastewater treatment plant where high loads become concentrated in the specific short: erm of a week or year.<BR>We built a pilot plant and performed the following exp eriments:<BR>We varied the load to ten times per a single day on one cycle in single-stage intermittent aeration system. We changed the amount of withdrawal excess sludge and the anoxic-oxic time ratio, in accordance with a given load, and thereby maintained a constant MLSS and ASRT.<BR>We found that while influent was BOD 150-200 mg/l, SS 140-160 mg/l, T-N 35-50 mg/l. and T-P 3.7-4.3 mg/l, effluent was 4-12 mg/l, 8 mg/l, 2.5-5.9 mg/l and 0.7-1.9 mg/l, respectively. Accordingly, we believe that we have achieve d a constant and stable treatment performance.

Load Fluctuation Countermeasures Using MLSS and ASRT Constant Control Method in Single-Stage Intermittent Aeration System.

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