Fenton-UV照射法对超高浓度聚乙烯醇有机废液的降解效能

刘夏杰; 刘峰; 詹杰; 李家文; 何烨; 林鹏

doi:10.7538/hhx.2021.YX.2021054

Fenton-UV照射法对超高浓度聚乙烯醇有机废液的降解效能

1.
中广核研究院有限公司,广东深圳518028
2.
广东省核电厂安全性能提升与放废处理工程技术研究中心,广东深圳518028

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出版历程
- 刊出日期: 2021-12-19

Degradation Efficiency of Ultra-High-Concentration Polyvinyl Alcohol Organic Waste Liquid by Fenton-UV Irradiation

1.
China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen 518028, China
2.
Guangdong Nuclear Power Plant Safety Performance Improvement and Waste Disposal Engineering Technology Research Center, Shenzhen 518028, China

摘要

摘要: 采用Fenton-紫外照射（Fenton-UV）联用工艺对核电厂超高浓度聚乙烯醇（PVA）有机废液进行处理，研究了PVA转化率、平均分子量、溶液黏度等随时间的变化规律。结果表明：对于50 g/L的PVA溶液，H₂O₂投加质量浓度为15 g/L，FeSO₄·7H₂O投加质量浓度为0.050 g/L，初始pH值为3，经过2 h Fenton反应和2 h UV照射（3 mW/cm²）之后，PVA转化率达到100%，溶液平均分子量从60 000~80 000 Da降低到1 000 Da以下，黏度降低到1.1 mPa·s，但总有机碳和化学需氧量（COD）变化不大。Fenton-UV法可作为预处理方法，前期Fenton阶段提高PVA的溶解度，增加反应溶液中的PVA含量，并进行初步降解和氧化；后期UV法进一步降解溶液中的PVA，有效降低其分子量和黏度，为后续处理提供有利条件，最终形成经济可行的超高浓度PVA有机废液处理工艺。
- 聚乙烯醇 /
- Fenton /
- 有机废液 /
- 降解
Abstract: Fenton-ultraviolet irradiation(Fenton-UV) combined process was used to treat ultra-high-concentration polyvinyl alcohol(PVA) organic waste liquid of nuclear power plants, and the changes of PVA conversion rate, average molecular weight, solution viscosity, etc. over time were studied. The results show: for 50 g/L PVA solution, the concentration of H2O2 is 15 g/L, the concentration of FeSO₄·7H₂O is 0.050 g/L, the initial pH is 3, after 2 h Fenton reaction followed by 2 h UV irradiation(3 mW/cm2), the removal efficiency of PVA reaches 100%, and the average molecular weight in solution decreases from 60 000~80 000 Da to <1 000 Da. The viscosity decreases to 1.1 mPa·s, while only slight variations are observed for total organic carbon and COD. Fenton-UV method can be used as a pre-treatment. In the former Fenton stage, the solubility increases, and the concentration of PVA in solution can reach a very high level. A preliminary degradation and oxidation are also conducted in this stage. During the later UV stage, PVA can be further degraded, and the molecular weight and viscosity are significantly decreased. Fenton-UV treatment will be benefit to the further treatment, and it can be a cost-effective treatment method for ultra-high concentration PVA solution.
- polyvinyl alcohol /
- Fenton /
- organic waste liquid /
- degradation

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