Novel autotrophic nitrogen removal system using gel entrapment technology |
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Authors: | Isaka Kazuichi Itokawa Hiroki Kimura Yuya Noto Kazuhiko Murakami Takao |
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Institution: | a Hitachi Plant Technologies Ltd., Kami-Hongo 537, Matsudo, Chiba 271-0064, Japan b Japan Sewage Works Agency, Shimo-Sasame 5141, Toda, Saitama 335-0037, Japan |
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Abstract: | A pilot plant involving a nitritation-anammox process was operated for treating digester supernatant. In the preceding nitritation process, ammonium-oxidizing bacteria were immobilized in gel carriers, and the growth of nitrite-oxidizing bacteria was suppressed by heat-shock treatment. For the following anammox process, in order to maintain the anammox biomass in the reactor, a novel process using anammox bacteria entrapped in gel carriers was also developed. The nitritation performance was stable, and the average nitrogen loading and nitritation rates were 3.0 and 1.7 kg N m−3 d−1, respectively. In the nitritation process, nitrate production was completely suppressed. For the anammox process, the startup time was about two months. Stable nitrogen removal was achieved, and an average nitrogen conversion rate of 5.0 kg N m−3 d−1 was obtained. Since the anammox bacteria were entrapped in gel carriers, stable nitrogen removal performance was attained even at an influent suspended solids concentration of 1500 mg L−1. |
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Keywords: | Anammox Nitritation Gel entrapment Nitrogen removal Digester supernatant |
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