Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Nitrogen Removal Reproducibility from Weak Organic Sewage using Pilot Scale BNR Process Applied Fixed Biofilm

고정생물막을 적용한 Pilot규모 BNT공정에서 유기물농도가 낮은 하수내의 질소제거 재현성

Kim, Mi-Hwa;Rah, Seung-Woo;Cho, Kyu-Kap;Park, Tae-Joo
김미화;나승우;조규갑;박태주

  • Published : 20020600
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Abstract

The aim of this study was to confirm nitrogen removal reproducibility from weak organic sewage using pilot sacle BNR process applied fixed biofilm which was scaled up lab scale [anoxic(1)/mid. settler/aerobic(1)/anoxic(2)/aerobic(2)] The other was to estimate denitrifying efficiency using internal carbon source from raw sewage(RUN-1) and primary effiuent(RUN-2) at each anoxic(1) reactor of pilot scale BNR process. In spite of large fluctuation of influent $TCOD_{cr}$ and SS concentration. effluent quality of RUN-l was below 20.0 mg/L and same results of lab scale. In the case of RUN-2 using primary effiuent. effluent concentration was less than 10.0 mg/L. Dissimilarly influent $TCOD_{cr}$ and SS fluctuation. average influent ${NH_4}^+-N$ concentration of two processes was 24.2 and 21.1 mg/L, respectively and was decreased upto 10.0 mg/L because of diluted with respect to the amount of rainfall. ${NH_4}^+-N$removal efficiency and effluent quality of RUN-1 and RUN-2 was about 90.0% and below 5.0 mg/L, T-N removal efficiency and effluent quality added methanol at the anoxic(2) reactor of two processes was 89.2% and 84.0%. respcetively and stable and less than 5.0 mg/L. $NO_x-N $removal rate and efficiency at the anoxic(1) reactor of RUN-1 using internal carbon source was twice of RUN-2's and 68.9%. The results of organic matter. suspended solids and nitrogen removal in pilot scale BNR process. showed reproducibility of lab scale's.

본 연구의 목적은 고정생물막을 적용한 lab scale[무산소 (1) /중간침전조/호기성 (1)/무산소(2)/호기성(2)] 공정을 scale-up한 pilot 규모 BNR공정을 이용하여 유기물농도가 낮은 하수내의 질소제거시 재현성을 확인하고 원하수(RUN-1)와 1차 처리수(RUN-2)내 내부탄소원에 의한 무산소조(1)에서의 탈질효율을 평가하는데 있다. RUN-1의 경우 유입 $TCOD_{cr}$농도와 SS농도가 크게 변화되었음에도 불구하고 유출농도는 20.0 mg/L 미만이었으며 lab scale과 동일하였다. RUN-2는 10.0 mg/L미만으로 안정적인 처리수질을 나타내었다. 유입 $TCOD_{cr}$ 및 SS의 변동과는 달리, RUN-1과 RUN-2의 평균 ${NH_4}^+-N$ 농도는 24.2와 21.1 mg/L였 으며, 강우량에 따라 희석되어 10.0 mg/L 까지 저하되었다. RUN-1과 RUN-2의 ${NH_4}^+-N$ 제거효율과 유출농도는 각각 약 90.0%와 5.0 mg/L 미만이었으며. T-N 제거효율은 각각 89.2%와 84.0%이고 T-N 농도는 5.0 mg/L이하로 안정적이었다. 내부탄소원을 이용한 RUN-1의 무산소조(1)의 $NO_x-N $ 제거율은 RUN-2의 2배로 높았고, $NO_x-N $ 제거효율은 68.9%로 lab scale과 동일한 결과를 나타내었다. Pilot 규모 BNR공정의 유기물, SS 그리고 질소세거 결과는 lab scale에서 얻어진 연구결과의 재현성을 보여주었다.

Keywords

References

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