排煙脱硝脱硫排水中の窒素除去のパイロットテストによる検討 : 排煙脱硝脱硫排水の処理の実用化に関する研究(第3報)

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Wastewater from NOx and SOx removal facilities was treated with pilot-scale submerged biofilters to reduce the concentration of the nitrogen compounds-N (NS-N), NH_4^+-N and NO_3^--N to less than 3 gm/l as total nitrogen. Phosphate was added as a nutrient. Unused phosphate was removed to a concentration of less than 0.1 mg/l by combined treatment by aluminum sulfate coaqulation adn sand filtration.COD_<Mn> of the reated water by the combined processes was around 10 mg/l.Biological nitrification and denitrification rates were found to depend on the surface areal loading rate in the biofilter. From Lineweaver-Burk plots, the maximum reaction rates were 4.8 g/m^2・day for nitrification and 8.6 g/m^2・day for denitrification.Biological nitrification in the biofilter was markedly effected by the physical mixing of water by aeration. The relation between NH_4-N removal rate υ_1 and air velocity G was represented by υ_1=0.87G^<0.88>.
社団法人日本生物工学会の論文
1981-03-25