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应用强电场电离放电方法产生羟自由基溶液,对基于国际海事组织《控制和管理船舶压载水及沉积物国际公约》第D-2条的羟自由基快速灭活海藻进行了模拟实验研究。结果表明,羟自由基对模拟压载水中初始浓度分别为1.1×104、5.0×104、4.0×104和2.4×104cell/mL的球等鞭金藻、聚球藻、小新月菱形藻以及上述3种海藻混合藻都表现出良好的杀灭效果。在模拟处理压载水系统中,在羟自由基浓度为0.62mg/L条件下,同时在输送管道中接触时间达到6s时,藻类的致死率均达到99.96%以上,24h后检测无活藻再生现象,满足《公约》第D-2条排放标准。同时监测的排放压载水水质情况表明,海水的pH值、盐度、电导率几乎不变;浊度明显下降,总固体悬浮物含量降低85%,化学需氧量降至未检出程度;磷酸盐和无机氮总含量等检测均符合海洋水质标准。
A strong electric field ionization discharge method was used to generate hydroxyl radical solution. The simulation experiment was carried out on fast inactivation of hydroxyl free radicals based on IMO regulation D-2 of International Convention for the Control and Management of Ships’ Ballast Water and Sediment. The results showed that the effects of hydroxyl radical on Isochrysis galbana, Synechococcus xylostella, Rhodhotra sp. Xylophilus with the initial concentrations of 1.1 × 10 4, 5.0 × 10 4, 4.0 × 10 4 and 2.4 × 10 4 cells / mL in simulated ballast water, All three kinds of seaweed mixed algae showed good killing effect. In the simulated treatment of ballast water system, the lethal rate of algae reached 99.96% when the hydroxyl radical concentration was 0.62mg / L and the contact time was 6s in the pipeline, and no algae regeneration was detected after 24h Phenomenon to meet the emission standards of Article D-2 of the Convention. Meanwhile, the monitoring of discharge ballast water quality shows that the pH, salinity and conductivity of seawater hardly change; the turbidity drops obviously, the content of total solid suspended matter decreases by 85% and the chemical oxygen demand drops undetected; Phosphate and inorganic nitrogen total content and other tests are in line with marine water quality standards.