| 摘要 |
<p>PURPOSE:To treat high-concn. drainage with the conserved space and to easily perform liquid-solid separation by sticking microorganisms to immobilized microorganisms while fluidizing the same together with raw water and performing oxidative decomposition treatment by the stuck microorganisms as the substrate thereof and settling the immobilized microorganisms and performing liquid-solid separation. CONSTITUTION:Air is supplied into both a pipe part 15 for descending flow and a pipe part 16 for ascending of a longitudinal shaft 10 and circulation flow is formed. Immobilized microorganisms are fluidized together with raw water through the longitudinal shaft 10. Microorganisms are stuck to the immobilized microorganisms during this fluidization. Oxidative decomposition treatment is performed as the substrate of microorganisms. Immobilized microorganisms discharged into a head tank 20 are settled and also liquid-solid separation of the treated water is performed in a liquid-solid separation part 21. Thereby since separation of immobilized microorganisms is easily performed, decomposition and removal of BOD component due to immobilized microorganisms are surely performed. Further since treatment is enabled with high space loading, the volume of an aeration tank is made small.</p> |
