强电场放电制备羟基自由基处理压载水实船试验

On-board Trial of Ballast Water Treatment System Based on Hydroxyl Radicals Produced by Strong Electric-field Discharge

针对防治海洋外来生物入侵性传播这一国家重大需求,利用大气压强电场放电的极端物理手段高效制备羟基自由基这一技术治理船舶压载水.实船试验在大连港"育龙号"上进行,羟基自由基压载水处理系统的处理量为250 m3/h,试验从生物有效性、相关化学物质分析以及水质指标变化3个方面对系统性能进行考察.试验结果表明,处理后压载水生物有效性可以达到国际海事组织(IMO)D-2标准;产生的相关化学物质以三溴甲烷浓度最高,其生成量为88.14μg/L;水质指标中溶解有机碳(DOC)、颗粒有机碳(POC)和总悬浮颗粒物(TSS)有明显变化,其变化规律是DOC随着时间的增加而增加,POC随着时间的增加而降低,TSS随时间增加而降低.该设备为在航治理船舶压载水提供了成功的范例,为开拓全球航运市场提供了技术支撑.

The prevention of marine biological invasion is a major demand of our country, and the ballast water treatment system of ships, based on hydroxyl radicals, has been developed. According to the advanced oxidation process principle, a novel method was proposed for OH radical generation by using strong electric-field discharge under atmospheric pressure, and a non-equilibrium plasma generator was built. Oxygen and gas phase water were ionized by high energy electron, and then dissociated into free active radicals or ions. These active radicals or ions were mixed well with water, followed by serious plasma chemical reaction to form OH radicals. The on-board trial was carried out on ＂Yulong＂ ship with the treatment capacity of 250 m^3/h. The biological efficacy and relevant chemicals analysis were investigated. The test results indicate that the application of hydroxyl radicals is found to be an effective method to kill algae and bacteria; the results meet the standards set by regulation D-2 of the Convention; the concentration of tribromomethane as the main disinfection by-products is 88. 14μg/L; no significant differences are obtained from water qualities, except dissolve organic carbon （DOC）, particle organic carbon （POC） and total suspended solid （TSS） ; the DOC increases over time ; on the contrary, POC decreases ; TSS decreases over time. The OH ballast water treatment system provides a successful example during voyage and technical support for the development of global shipping market.