Removal Characteristics of Organic Pollutants from Eutrophic Raw Water by Biological Pretreatment Reactors

Figure 1

The schematic diagram of two biological pretreatment reactors. CSBR: cascade biofilm reactor; OSBR: one-step biofilm reactor. 1. Inlet pipe, 2. outlet pipe, 3. air inlet pipe, 4. mud pipe, 5. effluent flume, 6. filler, and 7. water and air arrangement plate. Reactor size: the OSBR is square: length × width = 600 × 600 mm; the cells of CSBR are round; the diameter of each cell is 380 mm.