CIESC Journal ›› 2022, Vol. 73 ›› Issue (10): 4692-4706.DOI: 10.11949/0438-1157.20220590

• Energy and environmental engineering • Previous Articles     Next Articles

Study on purification of toluene waste gas by ultrasonic atomization/surfactants-enhanced absorption coupled with biological scrubbing

Xiaosong HOU1,2,3(), Chenxing LIU1,2,3, Ailing REN1,2,3, Bin GUO1,2,3(), Yuanming GUO4   

  1. 1.School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
    2.National and Local Joint Engineering Research Center of Volatile Organic Compounds & Odorous Pollution Control Technology, Shijiazhuang 050018, Hebei, China
    3.Hebei Province Air Pollution and Control Promotion Center, Shijiazhuang 050018, Hebei, China
    4.School of Environmental and Bioengineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
  • Received:2022-04-26 Revised:2022-08-08 Online:2022-11-02 Published:2022-10-05
  • Contact: Bin GUO

超声雾化/表面活性剂强化吸收耦合生物洗涤净化甲苯废气

侯晓松1,2,3(), 刘晨星1,2,3, 任爱玲1,2,3, 郭斌1,2,3(), 郭渊明4   

  1. 1.河北科技大学环境科学与工程学院,河北 石家庄 050018
    2.挥发性有机物与恶臭污染防治技术国家地方联合工程 研究中心,河北 石家庄 050018
    3.河北省大气污染防治推广中心,河北 石家庄 050018
    4.南京理工大学环境与生物工程学院,江苏 南京 210094
  • 通讯作者: 郭斌
  • 作者简介:侯晓松(1995—),男,硕士研究生,15075168995@163.com
  • 基金资助:
    河北省重点研发计划项目(21373704D)

Abstract:

To improve the efficiency of the biological method for the purification of hydrophobic VOCs, an ultrasonic atomization/surfactants-biological washing reactor (USBWR), featuring micron-sized droplets combined with surfactants was constructed in this study. The removal capacity and recovery performance of USBWR for toluene exhaust were investigated, the optimal process conditions and droplet size distribution of USBWR were discussed, the microbial community structure of the system was analyzed, and the difference in purification performance between USBWR and traditional biological washing reactor (TBWR) was compared. The results show that USBWR has higher toluene removal capacity and removal load than TBWR system, which is more suitable for non-continuous working conditions of enterprises. Under the conditions of inlet gas concentration of 2000 mg·m-3 and atomization volume of 450 ml·h-1, the best process conditions of USBWR were optimized by response surface method with washing solution pH of 7.07, residence time of 54.60 s and liquid-gas ratio of 0.23, and the removal rate of USBWR reached 97.26%. When the compound surfactant solution (50 mg·L-1 saponin + 500 mg·L-1 sodium citrate + 200 mg·L-1 citric acid + 50 mg·L-1 sodium chloride) obtained from the pre-screening laboratory was applied to the ultrasonic atomizer, the droplet size was less than 15 μm, the median diameter is (6.911±0.326) μm, the specific surface area is (359.60±50.02) m2·kg-1, with small and uniform droplets, which is conducive to making the gas-liquid contact more adequate. The main microbial phyla in the USBWR system are Proteobacteria, Bacteroidota and Chloroflexi. Compared with the TBWR system, the USBWR system promotes the growth of the dominant bacteria Proteobacteria. The enrichment growth is more conducive to the degradation of toluene waste gas.

Key words: ultrasonic atomization, compounded surfactant, organic compounds, biotechnology, mass transfer, droplet size distribution, microbial community, degradation

摘要:

为提高生物法净化疏水性VOCs的效率,构建了以微米级雾滴结合表面活性剂为特色的超声雾化/表面活性剂耦合生物洗涤器(ultrasonic atomization/surfactants-biological washing reactor,USBWR)。考察了USBWR对甲苯废气的去除能力及停运恢复性能,探讨USBWR最佳工艺条件及雾滴粒径分布,并分析系统中微生物群落结构,对比其与传统生物洗涤器(traditional biological washing reactor,TBWR)净化性能差异。结果表明:USBWR较TBWR系统有较高的甲苯去除能力和去除负荷,更适应企业非连续工况条件;在进气浓度2000 mg·m-3、雾化量450 ml·h-1条件下,响应曲面法优化USBWR最佳工艺条件为洗涤液pH 7.07、停留时间54.60 s、液气比0.23,USBWR去除率达97.26%;将实验室前期筛选得到的复配表面活性剂溶液(50 mg·L-1皂角苷+500 mg·L-1柠檬酸钠+200 mg·L-1柠檬酸+50 mg·L-1氯化钠)应用到超声雾化装置中,雾滴粒径均在15 μm以下,中位径为(6.911±0.326)μm,比表面积为(359.60±50.02)m2·kg-1,雾滴小而均匀,更有利于气液充分接触;USBWR系统中主要微生物细菌门为变形杆菌门(Proteobacteria)、拟杆菌门(Bacteroidota)和绿弯菌门(Chloroflexi),与TBWR系统相比,USBWR系统促进了优势菌种变形杆菌门(Proteobacteria)的富集生长,更有利于降解甲苯废气。

关键词: 超声雾化, 复配表面活性剂, 有机化合物, 生物技术, 传质, 雾滴粒径分布, 微生物群落, 降解

CLC Number: