Journal of Environmental Conservation Engineering

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In vessel regulation of the International Maritime Organization(IMO), primary regulations and secondary regulations are already in enforcement, and the 3rd set of regulations is scheduled for 2016. In general ocean space, although many vessel reduction technologies have been reported, problems remain. In order to comply with future regulations, it is necessary to use two or more pieces of post-processing equipment, but the increase of engine back pressure causes an increase of fuel consumption. This study tried simultaneous reduction of the contaminant in an exhaust gas by changing the solvent of the scrubber and using a corona discharge in the exhaust gas charger. Both fresh water and sea water were used for the solvent of the scrubber. The chemical reaction was induced simultaneously by collection of particulate matter(PM). Engines tested were four stroke cycle engines with heavy carbon oil fuel. NOx, emissions were reduced approximately 40%, CO₂ emissions by approximately 80% and PM by approximately 97%. Counteraction occurred by using sea water for the scrubber solvent, and we concluded that the waste water generated by the scrubber was detoxified.

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It is necessary to develop new treatment systems that can efficiently treat food waste in various places. In this research, we constructed a small-scale plant two-phase methane fermentation system equipped with solubilization. In a continuous seven month experiment, we analyzed performance and microflora in this system. We found that the solubilization process could handle a volumetric load of 150 ㎏-garbage/day and that the COD removal process could be operated at 94% or more. This system has the advantage of making possible the discharge of treated water into the sewer system. It is suggested that lactic acid bacteria converts waste material into lactic acid. A so far uncultured archaea Rice Cluster III is detected in the methane fermentation vessel.

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