A Survey of Operating Problems Associated with Sewage Treatment Plants in Japan.

概要

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A questionaire survey was carried out in two trials to examine the overall situation on both the general operating problems of 785 sewage treatment plants in Japan and the corresponding solid-liquid failure caused by filamentous microorganisms. The results showed that operating problems had obviously occurred at about 80% of sewage treatment plants in Japan. About onethird of all operating problems experienced over the past five years was "filamentous bulking" followed by "abnormal foaming and scum". The change of temperature, the sidestreams from the sludge treatment facilities, a large quantity of SS in pipes and the fluctuation of influent loading were regarded as the causes of "filamentous bulking". The causes of "abnormal foaming and scum" were not as easily identified as those of "filamentous bulking", but they were related to sludge level and nitrification in the aeration tank. From the point of the present situation of plants and their maintenance methods, the need for integrated management of both sewage and sludge treatment facilities was discussed in order to prevent the solid-liquid failure.
日本水処理生物学会の論文