UV-H2O2处理模拟船舶压载水技术的影响因素研究

An Empirical Study on the Factors Affecting the Simulation of Ship’s Ballast Water Technology by Ultraviolet-Hydrogen Peroxide Treatment

由于传统的紫外法处理船舶压载水,存在效率低、处理时间长等问题,采用紫外-双氧水(UV-H2O2)联用技术对实验室内模拟的船舶压载水进行处理。通过静态实验,考察了紫外灯光强、初始过氧化氢浓度、水体盐度、初始溶液pH等因素对紫外光分解过氧化氢效率以及羟基自由基瞬时浓度的影响。结果显示,随着紫外光强的增加紫外灯对过氧化氢的分解率也随之增大;初始过氧化氢浓度对紫外光解过氧化氢速率的影响较小,但对过氧化氢绝对分解量影响较大;当溶液中氯化钠浓度低于0.61 mol/L,紫外光分解过氧化氢效率随着氯化钠浓度的升高而升高。而当浓度高于0.61 mol/L,这种促进作用减弱;碱性环境下紫外光分解过氧化氢的效率大于中性和酸性环境,其中在酸性环境下效率最低;酸性环境下更有利于羟基自由基的生成,中性环境次之,碱性环境最差;pH维持在4~5之间产生的羟基自由基量可杀灭压载水中大部分有害微生物。以上结论为UV-H2O2联用技术的三维数值模拟提供率定值,同时也为该技术在实际船舶压载水处理中的工程应用奠定基础。

There are some problems on ship ballast water treatment by traditional ultraviolet methods such as poor efficiency and long processing time,therefore,the ultraviolet light combined with hydrogen peroxide is used to treat the simulated ship ballast water in laboratory.With static experiments,decomposition efficiency of hydrogen peroxide under ultraviolet light are investigated,as well as instantaneous concentration of hydroxyl radical are analyzed.The initial concentration has less effect on H2O2 rate,but it has an obvious influence on H2O2 absolute decomposition.When NaCl concentration is lower than 0.61 mol/L,the efficiency of UV light decomposition of hydrogen peroxide increases with the increase of sodium chloride concentration.When the concentration is higher than 0.61 mol/L,this promotion is weakened.Alkaline environment is more efficient than neutral and acidic environments for UV light decomposing hydrogen peroxide,while in acidic environment,the efficiency is the lowest.In the acidic environment,the formation of hydroxyl radicals is more advantages.The neutral environment is the second,and the alkaline environment is the worst.When the pH between 4 and 5,the amount of hydroxyl radicals generated can kill most harmful microorganisms in ballast water.These results can provide a standard value for the three-dimensional numerical simulation of the UV-H2O2 combined technology,and also establish a foundation for the treatment of ballast water.