| 摘要 |
PROBLEM TO BE SOLVED: To realize a combined sewage treatment tank by effectively utilizing an existing single sewage treatment tank. SOLUTION: The combined sewage treatment tank is constituted by connecting a combined treatment system 20 having a biological filter chamber 22 to the single sewage treatment tank having an anaerobic treatment chamber 3, an aerobic treatment chamber 4, a settling chamber 5 and a disinfection chamber 6.
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