Abstract
To provide the basic data necessary to establish maintenance plans for existing sewage treatment plants in severely depopulated areas, the reliability of the inflow measurements for small-scale sewage treatment facilities was investigated. It was found that the population trends in sewage treatment districts and those in administrative districts did not coincide with each other, so the reliability of population-related data was very low. In addition, despite the low possibility of the inflow of water from unknown sources, more than 78% of the surveyed sewage treatment plants reported an inflow that was higher than the amount of tap water used within the treatment area. In particular, for sewage treatment plants with a capacity of 50 ㎥/day or less, the reliability of the flow rate measured using a flow meter installed in the sewage treatment plants was very low because the value calculated based on tap water consumption ranged from about 25% to 120% of the flow rate measured by the flow meter. These results indicate that, in small-scale sewage treatment plants where the reliability of the flowmeter is questionable, it is important to estimate the inflow rate based on the tap water consumption within the treatment area.
Published Version
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