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선박 탑재용 오수처리시스템을 이용한 분뇨폐수의 COD 제거특성 평가

지현조 ( Hyeon-jo Ji ),정병길 ( Byung-gil Jung ),정진희 ( Jin-hee Jeong ),신대열 ( Dae-yeol Shin ),최영익 ( Young-ik Choi ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.1
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Annex IV of International Convention for the Prevention of Pollution from Ships (MARPOL 73/78), adopted by the United Nations specialized agency ‘International Maritime Organization’, provides a set of guidelines for shipboard sewage and manure waste treatment. This study was performed to customize and optimize the previously developed, Marine Equipment Directive-certified, large-scale marine sewage treatment system at a Bench-scale to evaluate the chemical oxygen demand (COD) of shipboard sewage. This sewage treatment system uses a combined process of a continuous batch reactor (SBR) and a membrane bioreactor (MBR) to suit the ship environment. This study aimed to derive the optimum operating conditions for the treatment of organic matter at the Bench-scale. The Submerged Membrane-Sequencing Batch Reactor (SM-SBR) method applied during this experiment excluded the precipitation process from the existing SBR method and treated sewage through a membrane using MBR process. The existing SBR method is performed through react (mixing and aeration) → sedimentation → draw, however, the sedimentation time in combined SM-SBR process is reduced, this study was performed in a repetitive operations of mixing and aeration processes. The developed device consisted of a down flow anaerobic reactor, screen, bioreactor, and membrane reactor, and in the case of raw-water, considering the water runoff; a constant water level was maintained through a pump. In this study, the experimental conditions 1~4 for stirring : aeration states were set at 70 : 50 min, 80 : 40 min, 90 : 60 min, and 100 : 50 min, respectively. The COD removal efficiencies for conditions 1~4 during each operating condition were 96.69 %, 95.93 %, 96.86 %, and 96.29 %, respectively. Further more, findings of this study suggest that the highest organic matter removal efficiency was achieved at condition 3 (stirring : aeration = 90 : 60 min).
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가축분뇨 및 음식물쓰레기의 혐기성 소화 병합처리 시 VS 제거효율과 메탄 발생량의 관한 연구

최영익 ( Young-ik Choi ),지현조 ( Hyeon-jo Ji ),정진희 ( Jin-hee Jung ),정병길 ( Byung-gil Jung ),김정권 ( Jung-geon Kim ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.9
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 ScienceON
 
 KCI
 
 DBpia
Livestock manure treatments have become a more serious problem because massive environmental pollutions such as green and red tides caused by non-point pollution sources from livestock manures have emerged as a serious social issue. In addition, more food wastes are being produced due to population growth and increased income level. Since the London Convention has banned the ocean dumping of wastes, some other waste treatment methods for land disposal had to be developed and applied. At the same time, researches have been conducted to develop alternative energy sources from various types of wastes. As a result, anaerobic digestion as a waste treatment method has become an attractive solution. In this study has three objectives: first, to identify the physical properties of the mixture of livestock wastewater and food waste when combining food waste treatment with the conventional livestock manure treatment based on anaerobic mesophilic digestion; second, to find the ideal ratio of waste mixture that could maximize the collection efficiency of methane (CH4) from the anaerobic digestion process; and third, to promote CH4 production by comparing the biodegradability. As a result of comparing the reactors R1, R2, and R3, each containing a mixture of food waste and livestock manure at the ratio of 5:5, 7:3, and 3:7, respectively, R2 showed the optimum treatment efficiencies for the removal of Total Solids (TS) and Volatile Solids (VS), CH4 production, and biodegradability.

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