| 摘要 |
<p>PURPOSE:To efficiently and biologically treat even waste water contg. a large amt. of carbohydrate type components increasing BOD without causing bulking by using a string-shaped fibrous material as contact filter media in activated sludge treating equipment and sticking filamentous fungi to the filter media. CONSTITUTION:A string-shaped fibrous material 14, preferably a twisted string- shaped fibrous material of polyvinylidene chloride or nylon is used as contact filter media arranged in the aeration tank of activated sludge treating equipment and filamentous fungi are stuck to the filter media. Though filamentous fungi are produced by biological treatment in the tank 10, they stick to the filter media 14, coexist with activated sludge based on Zooglea fungus and enhance the treating performance. Biologically treated water and activated sludge are introduced into a sedimentation tank 3. Since the sludge hardly contains filamentous fungi, bulking is not caused, solid-liq. separation is properly carried out and supernatant water is discharged.</p> |
