318 多孔質光触媒体および硝化・脱窒菌を利用した水質浄化システムにおける窒素除去(水環境保全技術,大気・水保全技術)

概要

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Sewage water scooped up from the primary sedimentation tank has been purified in the reactor tank containing nitrifier and the titanium dioxide porous photocatalyst. The time course of POC, DOC, ammonium ion, nitrite ion, and nitrate ion concentrations in sewage during the batch processing and the consecutive processing has been examined for a week. The rapid decrease of POC in the sewage water during the first 15 hours is shown to be dominantly due to the absorption by porous material. POC is decreased from 30〜45 ppm to 〜5ppm and DOC from 40〜60 ppm to 10ppm in 7 days because of the effect of absorption and processing by the porous photocatalyst. Ammonium ion is nitrified to nitrate ion in the reactor tank, showing that nitrifier coexists with photocatalyst and that porous photocatalyst promotes ammonium nitrification. Ammonium ion was nitrified to nitrite ion, and nitrate ion in the reactor. The nitrified sewage water has been kept for 4 days in the aerating reactor tank with the porous material containing denitrifier to examine the time course of nitrite ion, and nitrate ion concentrations. It is shown that denitrification is achieved even in the aerobic state and that the efficiency of denitrification depends on the size of porous material.
一般社団法人日本機械学会の論文
2005-07-06