Abstract
EGR is an important technical means to reduce NOx emissions from marine diesel engines, but EGR washing waste liquid contains a large amount of pollutants that must be treated before discharging the hull. On January 1, 2016, the IMO Tier III regulations have been implemented and the marine EGR system will be more widely used. Therefore, it is imperative to study the ship EGR plant wastewater treatment system. In this paper the author studied the IMO ship washing wastewater discharge regulations, and introduced the principle, composition, classification, overall layout and causes of wastewater generation of EGR devices. At the same time, the author analyzed the components of wastewater EGR system wastewater pollutants, and compared emission regulations. For the requirements of water quality, various technologies for treating EGR wastewater pollutants were studied. Based on various technologies, the author designed an air-floating wastewater treatment system to treat wastewater. The overall treatment plan, design ideas, structure and size design, and process flow of the device were analyzed and calculated in detail.
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