KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Characteristics of Nitrogen State with the Variation of Time Distribution in SBR Process

SBR 운전 구성시간 변화에 따른 질소거동의 특성

Lee, Kwang-Ho;Lee, Jae-Kune
이광호;이재근

  • Published : 2005.03.31

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Abstract

This study has investigated the characteristics of nitrogen mass balance and nitrogen removal ratio as Anoxic⑵ phase duration time changes 0, 70, 100 and 130 minutes in the SBR (Sequencing Batch Reactor) process. This study conducted the operation under the following conditions: SRT (Sludge Retention Time), 17.5 days; 1 cycle operating time, 6 hours ; COD load, 0.4 kgCODCr/$m^{3}/day; and, Nitrogen load, 0.4kg TN/$m^{3}/day.Nitrogen mass clarified at settle phase was 73.1, 64.9, 59.0, and 49.3 mgN/cycle, consisting of $NO_{3}$$^{-}$-N (about 90%), and the Nitrogen removal ratio was improved 57.9, 62.1, 65.6, and 73.2% as Anoxic⑵ phase duration time increased. During the above SBR process, Nitrogen mass included in wasted sludge was as respectively 21.8, 22.0, 22.4, and 22.3 $mgN_{waste}$/cycle, which means Anoxic⑵ duration time change did not affect Nitrogen removal. Nitrogen mass removed through denitrification was 76.5, 83.0, 90.5, and 96.5 mgN/cycle while Anoxic⑵ duration time increased. Nitrogen mass balance calculated through the sum of Nitrogen in clarified water, wasted Nitrogen in sludge, and denitrificated Nitrogen was 96.8, 96.3, 96.8, and 95.2%, showing acceptable value.

본 연구는 SBR공법의 무산소⑵구간의 분배시간을 0분, 70분, 100분, 130분으로 변화시킴에 따른 질소의 제거특성 및 물질수지를 산정하였다. 운전조건은 SRT 17.5일, 1-Cycle 운전시간 6hr, HRT 12hr, COD 유입부하 0.4kgCOD/$m^{3}/day, 질소 유입부하 0.068 kgCOD//$m^{3}/day였다. 무산소⑵구간의 분배시간 증가에 따라 73.1, 64.9, 59.0, 49.3mgN/cycle이 상등수로 유출됨으로써, 질소제거율은 57.9, 62.1, 65.6, 73.2%로 상승하였다. 또한, 호기구간 구성시간에 있어서 DO 변화의 이용은 실시간 제어의 가능성을 보여주었다. 슬러지 폐기로 제거된 질소의 양은 21.8, 22.0, 22.4, 22.3 $mgN_{waste}$/cycle로 무산소구간 구성시간 변화의 영향을 받지 않았다. 탈질로 인하여 제거된 질소의 양은 76.5, 83.0, 90.5, 96.5mgN/cycle로 증가하여 무산소구간의 증가가 질소제거효율을 증가시킨 것을 알 수 있었다. 상등유출수의 질소, 폐슬러지로 제거된 질소, 그리고 탈질로 제거된 질소의 합으로 계산된 질소 물질수지는 유입질소의 96.8, 96.3, 96.8 그리고 95.2%로 양호한 수치를 나타내었다.

Keywords

References

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