[논문]통합 하이브리드시스템의 압력강하 거동 및 바이오필터 담체의 미생물 population 분포

이은주; 임광희

doi:10.9713/kcer.2022.60.1.116

[국내논문] 통합 하이브리드시스템의 압력강하 거동 및 바이오필터 담체의 미생물 population 분포
Pressure Drop of Integrated Hybrid System and Microbe-population Distribution of Biofilter-media 원문보기

Korean chemical engineering research = 화학공학, v.60 no.1, 2022년, pp.116 - 124

초록
AI-Helper

교대로 운전되는 광촉매반응기 공정, 및 바이오필터 공정(전통적 바이오필터(L 반응기)와 두 개의 유닛(unit)을 가지는 개선된 바이오필터시스템(R 반응기))로 구성된 통합처리시스템에서, 에탄올과 황화수소를 동시 함유한 폐가스 처리를 수행하는데 발생하는 공정 당 압력강하(△p)와 바이오필터 공정의 미생물 population 분포를 관찰하였다. 교대로 운전되는 광촉매 반응기의 △p는, 바이오필터의 △p와 비교할 때에 무시할 정도로 작게 관찰되었다. L 반응기의 △p는, 통합처리시스템의 운전 중에 계속 증가하여 4.0~5.0 mmH₂O (i.e., 5.0~6.25 mmH₂O/m)로 증가하였다. 한편 R 반응기의 경우에서는 L 반응기의 △p의 약 16~20% 이하인 작은 △p를 나타내었다. 본 연구에서 적용한 공극율이 큰 폐타이어 담체 등의 바이오필터 담체 및 R 반응기 설계의 적용이, 목재 칩(wood chip)과 목재 바크(wood bark)의 50 대 50인 혼합물을 바이오필터 담체로 사용한 전통적 바이오필터의 보고된 압력강하 값의 각각 37~50%와 40~53% 만큼 압력강하 저감에 공헌하였다고 분석되었다. 또한 본 연구의 R 반응기 운전에서 압력강하 값이, 공극율이 큰 화산석(scoria)과 compost를 75 대 25로 혼합한 복합 담체를 충전한 전통적 바이오필터의 보고된 압력강하 값보다 약 80%만큼 저감된 결과는 주로 R 반응기 설계의 적용에 기인하였다고 해석되었다. 한편, 통합처리시스템에서 바이오필터 담체의 microbial population 분포로서 L 반응기 및 R 반응기의 담체 내 미생물 콜로니 수 비교에서는 L 반응기가 제일 밑단에서 다른 윗 단의 콜로니 수보다 거의 두 배로 증가하였으나; R 반응기의 경우는 R_dn 반응기와 R_up 반응기 각각의 상단과 하단에서 고르게 분포하였고 L 반응기보다 콜로니 수가 평균적으로 약 50% 정도 더 컸다. 이러한 현상은 R 반응기의 상단과 하단의 함수율이 50-55%의 고른 분포를 보인 것에 기인하였다. 따라서 개선된 바이오필터시스템이 전통적 바이오필터보다 △p와 미생물 population 분포에서 더욱 우수한 특성을 보였다.

Abstract ▼ AI-Helper

In this study, waste air containing ethanol and hydrogen sulfide, was treated by an integrated hybrid system composed of two alternatively-operating UV/photocatalytic reactor-process and biofilter processes of a biofilter system having two units with an improved design (R reactor) and a conventional biofilter (L reactor). Both a pressure drop (△p) per unit process of the integrated hybrid system and a microbe-population-distribution of each biofilter process were observed. The △p of the UV/photocatalytic reactor process turned out very negligible. The △p of the L reactor was observed to increase continuously to 4.0~5.0 mmH2O (i.e., 5.0~6.25 mmH2O/m). In case of R reactor, its △p showed the one below ca. 16~20% of the △p of the L reactor. Adopting such microbes-carrying biofilter media with high porosity as waste-tire crumb media, and the improved biofilter design, contributed to △p of this study, reduced by ca. 37~50% and 40~53%, respectively, from the reported △p of conventional biofilter packed with biofilter media of the mixture (50:50) of wood chip and wood bark. In addition, the △p of R reactor in this study, reduced by ca. 80% from the reported △p of conventional biofilter packed with biofilter media of the mixture (75:25) of scoria with high porosity and compost, was mainly attributed to adopting the improved biofilter design. On the other hand, in case of L reactor, the CFU counts in its lowest column was analyzed double as much as those in any other columns. However, in case of R reactor, its CFU counts were bigger by 50% than the one of L reactor and its microbes were evenly distributed at its higher and lower columns of Rdn reactor and Rup reactor. This phenomena was attributed to an even moisture distribution of 50~55% of R reactor at its higher and lower columns. Therefore, R reactor showed superb characteristics in terms of both △p and microbe-population-distribution, compared to L reactor.

주제어

표/그림 (11)

그림 Fig. 1. Schematic diagram of integrated hybrid waste-air treatment system.
그림 Fig. 2. Schematic diagram of alternately operating-two annular UV/photo-catalytic reactor integrated with a conventional biofilter (L reactor) and a biofilter with an improved design(R reactors), fed with synthetic contaminated air containing hydrogen sulfide and ethanol.
그림 Fig. 3. (a) Biofilter system with an improved design (R reactor). 1. R_up1 (lower column ① of upper biofilter), 2. R_up2 (upper column ② of upper biofilter), 3. R_dn1 (upper column ③ of lower biofilter), 4. R_dn2 (lower column ④ of lower biofilter), 5. Biofilter system with improved design, 6. Microbes-carrying-media, 7. Waste air fed to a biofilter(solid line), 8. Treated waste air fed bottom-up, 9. Treated waste air fed top-down, 10. Treated waste air upon feeding direction being reversed, denoted as “T”(dotted line), *ⓟ denotes a pressure gauge. (b) Conventional biofilter (L reactor): 1. L₁ (1st column ① of a biofilter), 2. L₂ (2nd column ② of a biofilter), 3. L₃ (3rd column ③ of a biofilter), 4. L₄ (4th column ④ of a biofilter), 6. Microbes-carrying-media, 7. Waste air fed to a biofilter, 9. Treated waste air fed top-down, *ⓟ denotes a pressure gauge.
표 Table 1. Operating-order of integrated hybrid system for waste-air treatment
표 Table 2. Operating conditions of integerated hybrid system for wate-air treatment
표 Table 3. Composition of Plate Count Agar(PCA) medium
그림 Fig. 4. Distribution of moisture (%) of biofiter-media at various effective heights of biofilters (L and R reactors).
그림 Fig. 5. Comparison of the number of colony obtained with dilution-multiplying factor of 10⁴ from L reactor at the end of HB3T stage (WT: waste tire-crumb media laden with microbes; AC: activated carbon media laden with microbes).
그림 Fig. 6. Comparison of the number of colony obtained with dilution-multiplying factor of 10⁴ from R_up and R_dn reactor at the end of HB3T stage (WT: waste tire-crumb media laden with microbes; AC: activated carbon media laden with microbes).
그림 Fig. 7. SEM (Hitachi, S-4300) image of the surface of microbes-carrying media from R reactor.
그림 Fig. 8. Transient behavior of pressure drops of photocatalytic reactor (P reactor) and biofilters [L reactor (conventional biofilter) and R reactor (biofilter system with a improved design) composed of R_dn reactor and R_up reactor as shown in Fig. 3] according to the operational order of integrated hybrid system treating waste air containing ethanol and hydrogen sulfide.

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

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