工业水处理 ›› 2023, Vol. 43 ›› Issue (2): 76-81. doi: 10.19965/j.cnki.iwt.2022-0841

• 试验研究 • 上一篇    下一篇

甲基肼废水的超临界/过热近临界水氧化降解研究

刘悦1(), 刘岩2, 柴涛1(), 田楠1, 王晨1   

  1. 1.中北大学环境与安全工程学院,山西 太原 030051
    2.北京航天试验技术研究所,北京 100074
  • 收稿日期:2022-12-11 出版日期:2023-02-20 发布日期:2023-05-26
  • 通讯作者: 柴涛 E-mail:550718565@qq.com;1375684860@qq.com
  • 作者简介:刘悦(1997— ),硕士。电话:15536885241,E-mail:550718565@qq.com
    柴涛,教授。电话:18636690525,E-mail:1375684860@qq.com
  • 基金资助:
    国家重点研发计划项目(2018YFB1900200)

Degradation of methyl hydrazine wastewater by supercritical/superheated near critical water oxidation

Yue LIU1(), Yan LIU2, Tao CHAI1(), Nan TIAN1, Chen WANG1   

  1. 1.School of Environmental and Safety Engineering, North University of China, Taiyuan 030051, China
    2.Beijing Institute of Aerospace Testing Technology, Beijing 100074, China
  • Received:2022-12-11 Online:2023-02-20 Published:2023-05-26
  • Contact: Tao CHAI E-mail:550718565@qq.com;1375684860@qq.com

摘要:

为使肼类燃料废水处理后达标排放,本研究利用超临界水氧化和过热近临界水氧化技术处理推进剂甲基肼废水并对比2种技术的降解效果。以COD和NH3-N为考察指标,通过正交实验研究了反应温度、压力、时间及过氧系数对甲基肼处理效果的影响,借助高效液相色谱对比分析了不同压力下甲基肼降解率随反应时间的变化过程,探讨了超临界水氧化和过热近临界水氧化状态下水的主要物性参数变化,并从化学平衡的角度探讨了自由基氧化反应速率的变化。结果表明,当温度为550 ℃、过氧系数为5、反应时间为4 min时,超临界水氧化状态(24 MPa)和过热近临界水氧化状态(18 MPa)下COD和NH3-N的处理效果均可达标;2种状态的反应进程不同,过热近临界水氧化状态主要受化学反应平衡移动的影响,超临界水氧化状态主要受高效传热和传质的影响,过热近临界水氧化状态处理肼类燃料废水更经济。

关键词: 超临界水氧化, 过热近临界水氧化, 甲基肼

Abstract:

In order to make the hydrazine fuel wastewater reach the discharge standard,supercritical water oxidation and superheated near critical water oxidation technologies were used to treat propellant methyl hydrazine wastewater and the degradation effects of the two technologies were compared. With COD and NH3-N as indicators,the effects of reaction temperature,pressure,time and peroxide coefficient on the treatment effect of methyl hydrazine were studied through orthogonal experiment. The change processes of degradation rate of methyl hydrazine with reaction time under different pressures were compared by means of high-performance liquid chromatography. The changes of main physical parameters of supercritical water oxidation and superheated near critical water oxidation,as well as the changes of free radical oxidation reaction rate from the perspective of chemical equilibrium,were discussed. The results showed that when the temperature,the peroxide coefficient and the reaction time was 550 ℃,5,and 4 min,the treatment effects of COD and NH3-N under supercritical water oxidation(24 MPa) and superheated near critical water oxidation(18 MPa) could reach the standard. The reaction processes of the two states were different. The superheated near critical water oxidation state was mainly affected by the movement of chemical reaction equilibrium,and the supercritical water oxidation state was mainly affected by the efficient heat and mass transfer. The superheated near critical water oxidation state was more economical to treat hydrazine fuel wasterwater.

Key words: supercritical water oxidation, superheated near critical water oxidation, methyl hydrazine

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