Synergistic Treatment of Low-concentration Organic Waste Gas by Micro-nano Bubble Coordinated with Peroxymonosulfate

Continuous dynamic experiment was conducted for the treatment of low-concentration organic waste gas with xylene as a representative, using micro-nano bubble and peroxymonosulfate working in synergy. The degradation rule of xylene under different conditions such as the ORP value of the spray liquid, pH value of the spray liquid, liquid-gas ratio of the spray liquid, residence time of xylene, and initial concentration of xylene was investigated. The results showed that at a low concentration, the pH value of the spray liquid had little effect on the degradation rate of xylene. The degradation rate of xylene rose with the increase of the ORP value of the spray liquid, the liquid-gas ratio of the spray liquid, the residence time of xylene, and the initial concentration of xylene.

高流量负荷下低浓度VOCs废气的生物法处理

高流量负荷下生物膜填料塔净化低浓度甲苯废气的实验结果表明,当气体流量在0.8m3/h,入口气体甲苯浓度为105mg/m3,停留时间18.3s时,甲苯的净化效率可达到61.9%,出口气体甲苯浓度低于国家对现有企业的排放标准(≤60mg/m3).适宜的操作温度应控制在20～25℃之间,氮磷营养添加量的配比应控制为C:N:P=200:5:1.依据实验结果数据,对相关的机理问题进行了分析探讨.

生物法净化低浓度甲苯废气装置及其操作特性

对生物法净化低浓度甲苯废气的适宜装置及其操作特性的研究表明，生物膜填料塔对低浓度甲苯废气的净化性能优于筛板塔及鼓泡塔；生物膜填料塔采用逆流并在液气比0.03～0.1、气速（30～60）m·h^(-1)的条件下操作时，低浓度甲苯废气净化效率可保持在90％以上．经实验验证，本生物膜填料塔对废气中甲苯的同系物同样具有净化作用．并且对再生胶厂、印刷厂、铸造厂、油漆厂等企业的实际生产废气也有良好的净化效果．

生化法净化低浓度挥发性有机废气的动力学模式研究

针对目前国际上常用的吸收—生物膜理论,在描述生化法净化低浓度挥发性有机废气机理过程中存在的问题,提出了吸附—生物膜的新理论,并依据这一新理论建立了生物膜填料塔净化低浓度甲苯废气的动力学模式。实验结果表明,其模拟计算值与实验值之间有很好的相关性,相关系数R>0.93。利用这一新理论及模式,可由已知操作参数对生物膜填料塔的净化效果进行预测计算,也能为有关的理论研究和实际操作提供参考。

低浓度SO_2冶炼烟气的液相催化法净化处理研究

为了研究适应我国国情的低浓度ＳＯ２冶炼烟气净化处理方法，在某铜冶炼厂通过试验考察了Ｍｎ（２＋）、Ｆｅ（２＋）、Ｚｎ（２＋）３种金属离子吸收液对ＳＯ２烟气的净化性能，并由正交试验找出了混合吸收液的最优配比．采用混合吸收液净化处理低浓度ＳＯ２冶炼烟气，当吸收液中硫酸浓度为２０％时，泡沫吸收塔的ＳＯ２净化效率仍可保持在８５％以上．这一方法对于中小型有色冶金企业的低浓度ＳＯ２冶炼烟气以及冶炼烟气制酸尾气的净化处理具有很好的适用性．

生物膜填料塔处理高流量负荷下低浓度甲苯废气的初探

采用净化甲苯专用菌种对生物膜填料塔净化处理高流量负荷下低浓度甲苯废气的技术进行了初步实验研究。实验结果表明 ,当气体流量在 0 8m3 /h、进口浓度为 10 5mg/m3 、停留时间 18 3s时 ,甲苯的去除率可达到 6 1 90 % ,出口甲苯浓度低于国家对现有企业的排放标准 (≤ 6 0mg/m3 )。适宜的操作温度应控制在 19～ 2 5℃之间 ,氮磷营养添加量的配比应控制为C∶N∶P =2 0 0∶5∶1,操作压降与气体流量呈线性关系。结合实验数据 ,对相关的基础理论进行了初步探讨。

多填料生物滤池处理化工企业低浓度混合废气的实践

为进一步提高化工企业无组织废气处理效果,采用喷淋+多填料卧式生物滤池工艺处理低浓度混合废气。运行结果表明:喷淋+多填料卧式生物滤池工艺对VOCs、NH3和H2S平均去除率分别达到92.6%、84.3%、88.0%,多填料卧式生物滤池对VOCs平均去除率达到90.7%;厂界无组织废气污染物浓度达一级标准,废气处理成本为6.32元/万m^3。

Theoretical model for removal of volatile organic compound (VOC) air pollutant in trickling biofilter

This paper presents an analytical model for predicting VOC waste gas degradation in a trickling biofilter. To facilitate the analysis, the packed bed is simplified into a series of straight capillary tubes covered by the biofilm. The gas-liquid flow field through the tube is divided into the liquid film flow on the biofilm and the gas core flow in the center. The biofilm consists of a reaction free zone close to solid wall and a reaction zone beneath the liquid film. The capillary tube model accounts for the effect of mass transport resistance in the liquid film and the biofilm, the gas-liquid interfacial mass transport resistance, the biochemical reaction, and the limitation of oxygen to biochemical reaction. The liquid film thickness in the capillary tube is obtained by simultaneously solving a set of hydrodynamic equations representing the momentum transport behaviors of the gas-liquid two-phase flow. The mass transport equations are established for gas core, liquid film, and biofilm combined with biochemical kinetics equations. An iterative computation process is employed to solve the discrete equations. The predicted purification efficiencies of VOC waste gas in trickling biofilter are found to be in good agreement with the experimental data. It has been revealed that for a fixed inlet concentration of toluene, the purification efficiency of trickling biofilter decreases with the increase in gas flow rate and liquid flow rate. The purification efficiency of VOC waste gas is dominated by mass transport resistance in liquid film and biofilm. The highest biodegradation rate occurs at the inlet of waste gas in trickling biofilter.

硫金精矿火法熔炼二氧化硫废气治理的研究

本文对低浓度SO_2(1～0.7％)废气净化治理工艺进行了论述。其一,采用石灰乳和含碱选矿尾水交替使用,有效控制硫酸盐结垢,实现了废气、废水综合治理,SO_2净化效率91.58％。其二,采用碳酸钠法吸收工艺,SO_2净化效率97.2％,硫资源得到回收利用,产出无水亚硫酸钠产品。