転炉スラグを散布した底泥における硝酸塩の生物学的・化学的還元

概要

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Based on the knowledge concerning the chemical reduction of NO3-N in the presence of Fe2+ and Cu2+ as a catalyst at a high pH range, the feasibility of an Fe-rich converter slag for NO3-N reduction in sediments was investigated. Components released from the slag were able to reduce NO3-N chemically. Magnesia contained in the slag functioned as a substitute for Cu2+ which is hardly contained in the slag. The chemical reduction of NO3-N was suppressed by phosphate. The major product of the chemical reduction of NO3-N was NH4-N, and the rates of formation of NO2-N and N2O-N were low. Biological reduction of NO3-N was comparable to the chemical reduction in the sediment amended with the slag in the pH range from 8 to 9. The major product was also NH4-N, but the denitrifying process became dominant with an increase in the biomass of denitrifiers. The release of NH4-N and NO2-N from the sediment amended with the slag was mainly due to chemical reduction of NO3-N by the slag. Fe2+ and Mg2+ in sediments as well as those originated in the slag play a significant role in NO3-N reduction.
社団法人　日本水環境学会の論文
2003-02-10