臭氧催化氧化-移动床生物膜反应器组合工艺深度降解柠檬酸生化尾水  

Ozone catalytic oxidation-moving bed biofilm reactor combined process for deep degradation of citric acid biochemical tail water

作　　者：杨佳鑫 叔新鹏 吴佳鑫 刘广青[1] 苏本生[1] YANG Jiaxin;SHU Xinpeng;WU Jiaxin;LIU Guangqing;SU Bensheng(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《环境工程学报》2021年第8期2740-2747,共8页Chinese Journal of Environmental Engineering

基　　金：政府间国际科技创新合作/港澳台科技创新合作重点专项项目(2019YFE0110900)。

摘　　要：针对柠檬酸生化尾水生化性差、色度高的特点,以MnO_(x)-CeO_(x)复合双金属氧化物作为催化剂,采用臭氧催化氧化-移动床生物膜反应器(MBBR)组合工艺对柠檬酸生化尾水进行了深度处理。结果表明,在臭氧投加量为30 mg·L^(-1),臭氧进气量为1 m^(3)·h^(-1),水力停留时间为60 min的条件下,臭氧催化系统对柠檬酸生化尾水COD去除率为35.4%,平均COD由110 mg·L^(-1)降至70 mg·L^(-1);平均色度由90倍降至15倍,色度去除率为83.3%;出水BOD5/COD由0.08提升至0.23,废水生化性得到显著提高。在气水比为4∶1、水力停留时间为6 h的MBBR系统中,出水COD则进一步降至32~40 mg·L^(-1),色度维持在10倍左右。此外,该组合工艺具有良好的运行稳定性,综合运行成本较低(0.79元·t^(-1))。以上研究结果表明,臭氧催化氧化-MBBR组合工艺对柠檬酸生化尾水具有较好的综合处理效果,可为柠檬酸行业污水处理系统的升级改造提供参考。Aiming at the characteristics of poor biochemical properties and high chroma of citric acid biochemical tail water, in this study, MnO_(x)-CeO_(x) composite bimetal oxide was used as a catalyst, and adopts ozone catalytic oxidation-moving bed biofilm reactor(MBBR) combined process was used to deeply treat the citric acid biochemical tail water. The results showed that at the ozone dosage of 30 mg·L^(-1), the ozone intake of1 m^(3)·h^(-1), and the hydraulic retention time of 60 min, the removal rate of oxygen-consuming organic pollutants(calculated as COD) in the biochemical tail water of citric acid by the ozone catalytic system was 35.4%, the average COD decreased from 110 mg·L^(-1) to 70 mg·L^(-1), the average chromaticity decreased from 90 times to 15 times, and the chromaticity removal rate was 83.3%;the BOD5/COD of effluent increased from 0.08 to 0.23, and its biodegradability was significantly improved. In the MBBR system with a gas-water ratio of 4∶1 and a hydraulic retention time of 6 h, the effluent COD further decreased to 32~40 mg·L^(-1), and the chromaticity maintained at about 10 times. In addition, the combined process has good operating stability and low overall operating cost(0.79 yuan·t^(-1)). The results of this study showed that the ozone catalytic oxidation-MBBR combined process had a good comprehensive treatment effect on the biochemical tail water of citric acid, which provides experimental basis and theoretical support for the upgrading and transformation of the sewage treatment system in the citric acid industry.

关 键 词：臭氧催化氧化 催化剂 移动床生物膜反应器 柠檬酸生化尾水 

分 类 号：X703.1[环境科学与工程—环境工程]