生物担体としてPVAゲルを活用した固定化 anammox 汚泥による窒素除去 Nitrogen Removal by Immobilized Anammox Sludge using PVA Gel as Biocarrier
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The use of a biomass carrier is preferred for the cultivation of slowly growing anammoxsludge. In this study, PVA gel was selected as a biomass carrier for anammox sludge audapplied in a fluidized-bed reactor (FBR). A recycle pump was used to induce a flow rateof 6 - 7 l/min to maintain fluidized bed conditions. Both influent NH4-N and NO2-Nconcentrations were increased stepwise to 300 mg N/l. With hydraulic retention times(HRTs) from 16 h to 9 h in phase 1, NH4-N and NO2-N removal efficiencies were about81% and 92%, respectively. With HRTs from 9 h to 4 h in phase 2, NH4-N removalefficiency was 77% and NO2-N removal efficiency was 89%. The removal rates ofammonium and total nitrogen in phase 1 increased up to 0.71 and 1.35 kg N/m3/d,respectively. Maximum removal rates of ammonium and total nitrogen in phase 2 increasedquickly up to 1.5 and 3.0 kg N/m3/d, respectively. Ratios of T-N removal, NO2-N removal,and NO3-N production to NH4-N removal during phase 1 were 1.91:1.12:0.22. These ratiosduring phase 2 were 1.96:1.18:0.21. The color of the PVA-gel beads changed from white tobrownish red, which is consistant with anammox bacteria. By the Denaturing Gradient GelElectrophoresis (DGGE) method, both KSU-1 and KU-2 anammox strains were detectedwith KSU-1 in dominance in the FBR process.
- Japanese journal of water treatment biology
Japanese journal of water treatment biology 42(3), 139-149, 2006-09-15
Japanese Society of Water Treatment Biology