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이재근 ( Lee Jae-kune ),최창규 ( Choi Chang-kyoo ),이광호 ( Lee Kyang-ho ) 한국환경기술학회 2001 한국환경기술학회지 Vol.2 No.2
본 연구는 CNR공정에서 오염부하에 따른 질소의 제거효율을 평가하기 위해서 수행 되었다. 연구결과로 오염부하의 조건을 표준과 고부하로 한 실험에서, 저부하의 조건보다 10% 이상의 높은 제거율을 나타냈으나, 유출수의 농도는 저부하 조건에서 가장 좋은 결과를 나타냈다. 질소의 유입부하에 의한 무산소조의 이론적인 체류시간이 공정의 질소 제거율에 미치는 영향은 크게 나타나지 않았는데 이는 내부순환과 준호기성단계를 설정한 CNR공정의 특성때문으로 사료된다. The purpose of this study was to investigate the nitrogen removal efficiency which was influenced by pollutant loading in CNR process. In the experiment of various pollutant loading, the removal efficiency of the standard and the high-loading conditions were higher than the low-loading condition at a rate of over 10%. The effluent, however, was the best result in the low-loading condition. The removal efficiency of nitrogen in the anoxic stage was not significantly influenced by theoretical anoxic retention time, which was considered to be caused by the internal recyling and a feature of the semi-aeration stage.
연속회분식 공정에서 COD부하에 따른 질산화/탈질율 및 유출질소 분류
이재근 ( Jae Kune Lee ),임수빈 ( Soo Bin Yim ) 한국물환경학회 2008 한국물환경학회지 Vol.24 No.1
In this study, we investigated the nitrification/denitrification rate and classification of output nitrogen of a sequencing batch reactor (SBR) system with the variation of COD loads ; COD loads of 0.3, 0.4, 0.6, 0.7, 0.8, 1.0 and 1.2 kgCOD/m3·d were tested to determine the optimum conditions for the operation of the SBR and increase its nitrogen removal efficiency. As the COD loads increased, the nitrification rate at aerobic(I) period and the denitrification rate at anoxic(I) period were decreased. With the variation of COD loads, the amounts of nitrogen removed in the clarified water effluent were 63.9, `54.2, 34.7, 22.5, 13.7, 12.5 and 26.5 mg/cycle, respectively. The amounts of nitrogen removed during the sludge waste process were 19.5, 26.6, 41.0, 47.3, 58.1, 72.4 and 88.1 mg/cycle, respectively. The amounts of nitrogen removed by denitrification were 66.8, 69.3, 68.9, 56.5, 39.5, 7.3 and 0.0 mg/cycle, respectively, indicating that COD load more than 0.7 kgCOD/m3·d decreases the amounts of denitrified nitrogen. The nitrogen mass balances were calculated as the percentages of nitrogen removed in the clarified water effluent or by denitrification and sludge waste processing in each cycle of SBR operation and were 99.0, 98.5, 95.4, 82.1, 73.0, 60.5 and 74.8% for COD loads of 0.3, 0.4, 0.6, 0.7, 0.8, 1.0 and 1.2 kgCOD/m3·d, respectively.
이재근 ( Lee Jae-kune ),이광호 ( Lee Kwang-ho ) 한국환경기술학회 2004 한국환경기술학회지 Vol.5 No.1
본 연구는 SBR 공법에서 HRT가 8, 12, 16, 24hr으로 변화함에 따른 질소물질수지 및 질소제거의 특성을 알아내고자 수행되었다. 실험의 운전 조건은 SRT 17.5일, 1-cycle 운전시간 4, 6, 8, 12hr, COD 부하 0.4 kgCOD<sub>Cr</sub>/m3 /day, 질소 유입율 166.5~177.0 mg/cycle 이었다. SBR 공정에서 침전 후 배출되는 유출수의 주요 구성성분은 NO<sub>3</sub><sup>-</sup>-N로 약 90%를 차지하고 있었으며, 총 질소함유량은 HRT 증가에 따라 70.0, 56.9, 52.5 69.4 mg/cycle 이었으며, 질소 제거율은 58.0 67.3, 70.0, 58.7%로 변화하였다. 슬러지 폐기로 인하여 제거된 질소의 양은 21.4, 21.9, 23.8, 22.6 mgN<sub>waste</sub>/cycle로 HRT에 따른 영향을 받지 않았다. 탈질로 인하여 제거된 질소의 양은 70.5, 95.0, 91.0 그리고 63.5 mgN/cycle를 나타냈다. 배출수의 질소, 폐슬러지로 제거된 질소, 그리고 탈질로 제거된 질소의 합으로 계산된 질소 물질수지는 유입질소의 97.2, 98.7, 95.5, 92.6%로 양호한 값을 나타냈다. This study has investigated the characteristics of nitrogen mass balance and nitrogen removal ratio as HRT (Hydraulic Retention Time) changes at the rate of 8, 12, 16, and 24 hour 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, 4, 6, 8, and 12 hour; COD load, 0.4 kg COD<sub>Cr</sub>/㎥/day; and nitrogen input rate, 166.5~177.0 mg/cycle. Nitrogen mass clarified at settle mode was 70.0, 56.9, 52.5, and 69.4 mg/cycle, consisting of NO<sub>3</sub><sup>-</sup>-N (about 90%), and the nitrogen removal ratio was changed 58.0, 67.3, 70.0, and 58.7% at the above rate of HRT variation respectively. During the above SBR process, Nitrogen mass included in wasted sludge was as follows respectively: 22.3, 23.0, 23.7, and 22.7 mgN<sub>waste</sub>/cycle. This result means HRT change did not affect nitrogen removal. Nitrogen mass removed through denitrification was 70.5, 95.0, 91.0, and 63.5 mgN/cycle while HRT increased. Nitrogen mass balance calculated through the sum of nitrogen included in clarified water, wasted nitrogen included in sludge, and denitrificated nitrogen was 97.8, 96.8, 95.4, and 92.6% compare with input nitrogen mass.