Reducing Nitrogen Content in Industrial Wastewater by Ultraviolet Irradiation

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  • YANO Yoshiko
    Department of Science & Engineering of Chemistry, Tokyo National College of Technology
  • ITO Saki
    Department of Science & Engineering of Chemistry, Tokyo National College of Technology
  • TANAKA Susumu
    Hakushin Chemical Laboratory Co., Ltd.

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  • 紫外線照射法による工業排水中の窒素成分低減法の検討
  • シガイセン ショウシャホウ ニ ヨル コウギョウ ハイスイチュウ ノ チッソ セイブン テイゲンホウ ノ ケントウ

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Abstract

It was proposed that ultraviolet(UV) irradiation could reduce nitrate to nitrite in an aqueous solution and that disodium ethylenediamine tetraacetate(EDTA) as an additive assists in the reduction of either nitrate or nitrite. The purpose of this study is to obtain basic data for a practical removal of nitrate and nitrite from industrial wastewater by UV irradiation. It was found that EDTA effectively removes nitrogen species at 1000-fold higher concentrations than the previous concentration examined by Takeda et al. and that glycine and glycolate are also very effective for the removal of nitrogen species. Glycolate was considered to be one of the decomposition products of glycine produced by UV irradiation. Both nitrate and nitrite from ammonium nitrate were completely removed by UV irradiation regardless of pH in most cases, when either of the additives was added with a molar ratio of about 1 to 1 as nitrate to a (N)-CH2COO-unit.

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