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정근진 ( Kun Jin Jung ),이상수 ( Sang Soo Lee ),김시현 ( Si Hyeon Kim ),박규홍 ( Kyoo Hong Park ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2
Nitrogen, in its various forms, can deplete dissolved oxygen levels in receiving waters, stimulate aquatic growth, exhibit toxicity toward aquatic life and affect the suitability of sewage for reuse. Pilot-scale Rotating Biological Contactor(RBC) experiments were conducted to examine biological nitrification, respectively, of municipal sewage with five different internal recirculation ratios of 0, 1, 2, 3, and 4 using the constant hydraulic loading of 205 U/㎡·day. The use of internal recirculation improved nitrification on account of the dilution of biodegradable organic carbon in influent sewage down to 15mg/L of SBOD_5 or less. Ammonium nitrogen of 14.3±2.4 % was consumed by cellular assimilation without the occurrence of denitrification. The thickness of biofilm didn`t seem effect significantly the nitrification and denitrification. Nitrification with internal recirculation was found to occur using hydraulic loading rate of as high as 205L/㎡·day, which was beyond the generally known values of it.
Agitating Mixer System 을 이용한 고농도 페수처리의 동력학적 해석
이상수(Sang Soo Lee),김시현(Si Hyeon Kim),정근진(Kun Jin Jung) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.6
Biofilm reactors were numbered in terms of temperature, and biofilm reactor No.1 represented 25℃ and No.2 15℃. At 24hr of HRT, BOD removal efficiency was 94.7% at biofilm reactor No.1 and 92.3% at No.2, respectively, while it was about 90.0% for biofilm reactor No.1 and No.2 at 18hr of HRT. However, BOD removal efficiency was decreased below 12hr of HRT. At 25℃ the half saturation constant(K_s) and maximum specific substrate removal rate(k_(max)) were 228 ㎎/L and 0.96 day^(-1), respectively. In addition, the microbial yield coefficient(Y), decay coefficient(K_d), and maximum specific growth rate(μ_(max)) were 0.248 ㎎VSS/㎎BODre, 0.048 day^(-1), and 0.372 hr^(-1), respectively. On the other hand, at 15℃ the saturation constant (K-s) and maximum specific substrate removal rate(k-max) were 600 ㎎/L and 1.82 day^(-1). The microbial yield coefficient(Y), decay coefficient(K-d), and maximum specific growth rate were 0219 ㎎VSS/㎎ BODre, 0.045 day^(-1), and 0.487 hr^(-1), respectively.
내부순환형 회전원판공정을 이용한 도시하수의 탈질화에 관한 연구
박규홍,정근진 대한상하수도학회 2002 상하수도학회지 Vol.16 No.1
Nitrogen, in its various forms, can deplete dissolved oxygen in receiving waters, stimulates aquatic growth, exhibits toxicity toward aquatic life and affects the suitability of sewage water for reuse. Pilot-scale Rotating Biological Contactor (RBC) experiments were conducted to examine biological denitrification, respectively, of municipal sewage with different internal recirculation ratios using the constant hydraulic loading of 410ℓ/㎡·day. The double substrate kinetic model suggested by Dixon and Brown (Biochemical Computer Program, P-Series, UCLA, 1977) was fitted to the data observed in the separate denitrification reactors, showing the correlation coefficient of 0.847. It was found that denitrification in the submerged RBC reactor was reason ably well simulated by Dixon and Brown's model and was significantly controlled by SBOD_5 and nitrate load. When an additional RBC unit in parallel was installed and operated to examine the effect of pH, the acceptable pH range for denitrification was between 6 and 9.
요인분석을 이용한 생물막반응기의 유기물질 제거효율 분석
이상수,서성원,정근진,김시현 대한상하수도학회 2001 상하수도학회지 Vol.15 No.2
In this paper, an experimental study was conducted to seize the treatment effects of dewatering liquid using the new biofilm reactor with attached agitating mixer in the existing biofilm reactor. Also the effects of influencing factor in the experiment was analyzed using two-level (2^n) factorial design. As results, with the influent BOD concentration 500 ㎎/L, the removal efficiencies obtained represented 90% for BOD, 87.3% for COD and 89.4% for SS as the mean respectively. On the other hand, with the influent BOD concentration 1,600 ㎎/L, BOD removal efficiency was 87.6% and removal efficiencies of COD and SS as an average were 86%, 88.5% respectively. In factorial design and analysis, the values of main effects of media compaction, agitating mixer, and temperature were computed as 6.18, 5.08 and 3.83, respectively. The most significant factor of this type of biofilm reactor was media compaction. The second important factor was agitating mixer.