工业水处理 ›› 2025, Vol. 45 ›› Issue (6): 138-149. doi: 10.19965/j.cnki.iwt.2024-0875

• 试验研究 • 上一篇    

天然白云石催化臭氧氧化处理煤化工废水的长周期研究

胡若晖1(), 李一鸣2, 金鹏1, 李琢宇1, 王庆宏1, 陈春茂1(), 詹亚力1   

  1. 1. 中国石油大学(北京)化学工程与环境学院,重质油全国重点实验室,北京 102249
    2. 海洋石油工程股份有限公司,天津 300451
  • 收稿日期:2025-03-20 出版日期:2025-06-20 发布日期:2025-06-19
  • 通讯作者: 陈春茂
  • 作者简介:

    胡若晖(1999— ),硕士,E-mail:

  • 基金资助:
    国家自然科学基金面上项目(22278436); 国家自然科学基金青年基金项目(22308382); 中国石油大学(北京)科研基金项目(2462024YJRC004)

Study on the long-term efficiency of catalytic ozonation treatment of coal chemical wastewater by natural dolomite

Ruohui HU1(), Yiming LI2, Peng JIN1, Zhuoyu LI1, Qinghong WANG1, Chunmao CHEN1(), Yali ZHAN1   

  1. 1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum (Beijing), Beijing 102249, China
    2. Offshore Oil Engineering Company Limited, Tianjin 300451, China
  • Received:2025-03-20 Online:2025-06-20 Published:2025-06-19
  • Contact: Chunmao CHEN

摘要:

针对煤化工废水污染负荷高、难降解有机污染物含量大等问题,开发了天然白云石催化臭氧氧化深度处理工艺。在间歇式催化氧化实验中,相较于单独臭氧氧化体系,催化臭氧氧化体系在反应时间为20 min时可将模拟废水中喹啉(质量浓度100 mg/L)的去除率提高15.1%,反应90 min时TOC去除率被提高27.3%;长周期连续流实验结果表明,周期性反冲洗可使白云石催化臭氧氧化体系在处理模拟煤化工废水时实现长周期稳定运行,使难降解有机污染物得以高效去除。此外,针对真实煤化工废水的处理,该工艺可保持144 h的连续稳定运行,出水平均COD为28.99 mg/L,平均TOC为9.62 mg/L,去除率分别为53.91%和49.40%。该工艺可实现对废水中溶解性有机物(DOM)的无选择性氧化,显著降低出水DOM的分子数量、平均分子质量和芳香度,并增加DOM的氧化程度。废水中CHON类和高含氧的CHOS类化合物被大量去除,同时产生高O/C和较低不饱和度的CHO和CHON类物质。白云石与目前商用催化剂催化臭氧氧化处理效果相当,但运行成本更低,且环境友好,没有重金属溶出风险。

关键词: 煤化工废水, 白云石, 催化剂, 臭氧催化氧化, 深度处理

Abstract:

A natural dolomite catalytic ozonation deep treatment process was developed to address the issues of high pollution load and high content of difficult to degrade organic pollutants in coal chemical wastewater. In the intermittent catalytic oxidation experiment, compared with the single ozone oxidation system, the catalytic ozonation system could increase the removal rate of quinoline (the concentration of 100 mg/L) in simulated wastewater by 15.1% at a reaction time of 20 min, and the TOC removal rate was increased by 27.3% at a reaction time of 90 min.The results of long-term continuous flow experiments showed that periodic backwashing could enable the dolomite catalytic ozonation system to achieve long-term stable operation in treating simulated coal chemical wastewater, resulting in efficient removal of recalcitrant organic pollutants. In addition, for the treatment of real coal chemical wastewater, this process could maintain continuous and stable operation for 144 h, with an average COD of 28.99 mg/L and an average TOC of 9.62 mg/L in the effluent, and removal rates of 53.91% and 49.40%, respectively. This process achieved non-selective oxidation of dissolved organic matter(DOM) in real coal wastewater, significantly reduced the molecular number, average molecular weight and aromatization, and increased the oxidation degree of DOM. CHON and highly oxygenated CHOS species were largely removed from wastewater, while CHO and CHON species with high O/C and low unsaturation were produced. The catalytic ozonation treatment effect of dolomite was comparable to that of current commercial catalysts, but the operating cost was lower and environmentally friendly, with no risk of heavy metal leaching.

Key words: coal chemical wastewater, dolomite, catalyst, catalytic ozonation processes, advanced treatment

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