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生物滴滤法净化MEK废气
Biotrickling Filter Process for Purifying MEK
【作者】 樊奇;
【导师】 羌宁;
【作者基本信息】 同济大学 , 环境工程, 2006, 硕士
【摘要】 MEK(Methyl Ethyl Ketone,甲乙酮或2-丁酮)是一种优良的高级溶剂,应用于多种有机合成、香料、皮革及制药工业。同时,MEK又具有毒性,能使中枢神经功能下降,对人的身体健康造成伤害。 本研究旨在摸索生物滴滤法净化MEK的工艺条件,弄清进口负荷、进口气量、循环液流量和设备闲置等影响因素对净化效率和消除能力的影响,探索净化过程中气相向生物相的传质机理。 实验结果表明,在以不锈钢丝网和ACOF作为挂膜介质时,生物滴滤塔的最大消除能力为260g/m3.h;以ACOF作为挂膜介质,入口风量为1.35m3/h,当MEK入口负荷小于150g/m3.h时,塔的降解效率在90%以上;增加循环液流量可以小范围地提高塔的处理效果,之后再继续提高流量无法提高处理效果,甚至可能有抑制作用;在塔停运时保持间歇式供气供水,可以使塔内微生物保持一定的活性,有利于之后的恢复;以雾状喷淋式供液,可以将传统供液时70%的降解效率提高到96%,同时CO2的产生量也有提高,说明雾状喷淋改变了污染物和氧气与生物膜的接触方式,促进了生物滴滤塔的净化效果。
【Abstract】 MEK(Methyl Ethyl Ketone) is a high quality solvent, applied in the field of organic synthesizing, flavor, leather and pharmacy industry. However, MEK has toxicity, can do harm to human’s nerve and body.The research is to explore the technics conditions of biotrickling filter for removal MEK and the influence of inlet mass loading, inlet gas loading, recycling liquid flowrate, idling of filter on removal efficiency and elimination capacity. The mechanism of mass transfer from gas phase to biofilm is also discussed.The experiment results showed that: 1.Using stainless steel mesh and ACOF as packing media, the maximum Elimination Capacity (EC) can reach to 260g/m3.h. 2.Using only ACOF as packing media, when inlet gas flowrate is 1.35m3/h and inlet MEK loading is less than 150g/m3.h, the filter can achieve over 90% removal efficiency. 3. Increasing recycling liquid flowrate can improve removal efficiency within a small range. Afterwards it is useless to improve removal efficiency by further increasing recycling liquid flowrate, and may have an adverse effect. 4. The biofilm can keep active when supplying air and water intermittently in no-use time of filter. 5. The removal efficiency of filter can improve from 70% to 96% after using fog spray instead of traditional way. The amount of CO2 has also increased. The results showed that fog spray has changed the contact way between pollutant, oxygen and biofilm, which promotes the filter removal effect.
【Key words】 biotreatment of gaseous pollutant; VOCs; biotrickling; MEK;
- 【网络出版投稿人】 同济大学 【网络出版年期】2006年 08期
- 【分类号】X701
- 【被引频次】9
- 【下载频次】248