Development of Real-Time Nitrification Denitrification Control with Activated Sludge Model to Achive Simultaneous Water Quality Improvement and Energy Saving

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  • MIYAOKA Takeshi
    東京都下水道局　計画調整部技術開発課
  • ARINO Takashi
    東京都下水道局　計画調整部技術開発課
  • YUDA Megumi
    東京都下水道局　計画調整部技術開発課
  • MIYAHARA Morio
    株式会社 明電舎　水インフラシステム事業部　技術部　東日本技術第一部　技術第三課
  • NAKATA Masayuki
    株式会社 明電舎　社会インフラ事業企画本部　ソリューション企画部　水・エネルギーソリューション部　第二課
  • TOYOOKA Kazuhiro
    株式会社 明電舎　水インフラシステム事業部　技術部　東日本技術第一部　技術第三課
  • WATANABE Shizuo
    東京都下水道局

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Other Title
  • 水質改善と省エネルギーの両立を目的としたリアルタイム硝化脱窒制御技術の開発
  • スイシツ カイゼン ト ショウエネルギー ノ リョウリツ オ モクテキ ト シタ リアルタイムショウカ ダッチツ セイギョ ギジュツ ノ カイハツ

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Abstract

<p>　The real-time nitrification control (RNC) reported previously reduced the air-to-flow ratio by about 10% while maintaining the water quality. Real-time nitrification denitrification control (RNDC), developed from RNC in combination with a circuit (section)-specific aeration control, is a technology that promotes denitrification to improve water quality and reduces air flow.</p><p>　RNDC is feed-forward control, consisting of the following processes: (1) Monitoring of an inflow NH4-N load by continuous measurement of inflow water quality, (2) calculation of the treatment process of each circuit in a reaction tank on the basis of the Activated Sludge Model, (3) calculation and determination of a necessary amount of air for nitrification reaction, (4) determination of existence and location of an area which lacks dissolved oxygen, and (5) control of air flow according to the determined location. We report the development of RNDC and results of a demonstration test performed for about two months that the denitrification rate rose from 55.7% to 64.7% and the air-to-flow-ratio decreased by about 11.6%, compared to the conventional practice with constant DO control.</p>

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