| 摘要 |
<p>PURPOSE: To maintain optimal F/M ratio of wastewater even under inflow fluctuation without flow equalization basin by installation of an extra means for concentration control of sludge discharged from bioreactor, thereby securing stable treatment efficiency of sewage/wastewater with decreased sludge return from secondary clarifier to bioreactor. CONSTITUTION: The system comprises a bioreactor(110) in which at least one or more of partition walls are installed in a flow direction of inflow to secure several reaction zones so that aeration and non-aeration are performed in each reaction zone; a settler(201) which is installed in each reaction zone of the bioreactor so that sludge contained in the inflow wastewater is settled by biological reaction, and a portion of treated wastewater is overflown after sludge removal; a final clarifier(120) which comprises a means for removing BOD and suspended solids (SS) contained in the treated water discharged through the settler, and returns a portion of the treated water to the bioreactor; and a means(301) which communicates with the settler to control sludge concentration of treated water discharged from the settler to the final clarifier, thereby maintaining F/M ratio of wastewater in the bioreactor.</p> |
