核化学与放射化学2026，Vol.48Issue(3)：325-330,6.DOI:10.7538/hhx.YX.2025.2025033
催化氧化处理放射性三辛胺-二甲苯废液的试验验证
Catalytic Oxidation Treatment of Radioactive Trioctylamine-Xylene Waste Liquids
康劲扬 1马永红 1周强 1张威 1陶萱 1巫帅珍 1袁小琳 1彭源源 1王林 1杨自强 1赵振翔 1石磊1
作者信息
- 1. 中核四川环保工程有限责任公司,四川 广元 628000
- 折叠
摘要
Abstract
The catalytic oxidation treatment of radioactive trioctylamine-xylene(V/V=1/4)organic waste liquid containing transuranic nuclides(total α activity:108 Bq)using commercially available nano-MnO2 as the catalyst was investigated in the present work.The process aims to convert organic components into non-dispersible solid residues while minimizing radionuclide release.The simulated experiments were conducted to validate the process over 90 hours of continuous operation.Results demonstrate that the trioctylamine-xylene mixture is predominantly decomposed into carbon dioxide,water,and trace small-molecule organics,achieving an inorganic conversion rate exceeding 95%.Key reaction parameters,including a reactor temperature of(190±20)℃,stirring rate of 30 r/min,and feed rate of 87 mL/h,are optimized to ensure stable operation.Post-reaction analysis reveals that residual carbon content in the catalyst increased from 0.044%to 2.08%,indicating minor carbon deposition.Tail gas analysis detects volatile organic compounds(TVOC:925.1 mg/m3),predominantly xylene(660.60 mg/m3),alongside trace benzene,toluene,and olefins,suggesting partial catalytic oxidation and chemical reforming pathways.Notably,trioctylamine exhibits higher catalytic degradation efficiency compared to xylene,likely due to its stronger polarity.Nitrogen oxides(NO:0.05 mg/m3,NO2:0.52 mg/m3)in the tail gas are minimal,implying nitrogen retention in solid residues or conversion to N2.Subsequent experiments in hot cell were successfully carried out to treat radioactive waste liquid under optimized conditions.Post-treatment radionuclide balance calculations reveal that＞98%of transuranic nuclides are retained in catalyst residues and reactor internals.Less than 0.001%of nuclides are released via gaseous pathways,confirming effective containment.Solid residues constitute 96.86%of the original activity.The catalytic oxidation system demonstrated robust performance in converting liquid organic waste into stable solid residues under mild conditions(190℃,atmospheric pressure),avoiding secondary pollution risks compared with high-temperature incineration or corrosive supercritical oxidation.This work validates catalytic oxidation as a viable method for treating radioactive organic liquids,particularly for small-batch operations.The process achieves high radionuclide immobilization while enabling safe gas-phase discharge,offering significant advantages over conventional cementation(e.g.,volume expansion,leaching issues)and glass vitrification(incompatible with organics).Further optimization of catalyst formulations and tail gas treatment can enhance decomposition efficiency for complex organic matrices.关键词
放射性有机废液/催化氧化/放射性废物处理/催化氧化装置/无机化Key words
radioactive organic waste liquid/catalytic oxidation/radioactive waste management/catalyt-ic oxidation device/inorganicization分类
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康劲扬,马永红,周强,张威,陶萱,巫帅珍,袁小琳,彭源源,王林,杨自强,赵振翔,石磊..催化氧化处理放射性三辛胺-二甲苯废液的试验验证[J].核化学与放射化学,2026,48(3):325-330,6.
