低温等离子体降解果品加工废水中糖类物质的研究

Degradation of Sugars in Fruit Processing Wastewater by Low Temperature Plasma

摘要:

利用臭氧发生器与低温等离子体技术处理废水中的糖类物质，通过重铬酸钾法和苯酚-硫酸法检测12种糖类物质的化学需氧量CODcr（Chemical Oxygen Demand）值与含糖量，对比经低温等离子体不同时间处理后糖类物质的含糖量的改变与CODcr的降解效率，进一步分析低温等离子体技术处理果品加工废水的可行性。数据显示：糖类物质CODcr值与其质量浓度、摩尔浓度都有较好的线性关系，C、H、O原子个数与CODcr关系为：1 mmol（CH2O）CODcr值为2.49±0.25 mg/L。12种糖类物质经经臭氧发生器和低温等离子体不同处理时间后的糖含量和CODcr值都呈下降趋势。两种方式处理10~40 min时CODcr值下降趋势较大，在40 min后趋于平缓。经低温等离子体处理60 min后，CODcr值下降到初始溶液CODcr值的42%~49%、糖含量下降到初始溶液糖含量的44%~59%；经臭氧发生器处理60 min后，CODcr值下降到初始溶液CODcr值的45%-53%、糖含量下降到初始溶液糖含量的49%~65%。结果显示：经低温等离子体处理后CODcr的降解效果与糖含量的降低都优于臭氧发生器，说明低温等离子体对果品加工废水中糖类物质有降解作用，对水质有改善作用。

Abstract:

The chemical oxygen demand (CODcr) and sugar content of 12 kinds of carbohydrates were measured by potassium dichromate method and phenol-sulfuric acid method. The change of sugar content and CODcr degradation efficiency of carbohydrates treated by low temperature plasma at different time were compared. Feasibility of treating fruit processing wastewater by body technology.The data show that the CODcr value of carbohydrates has a good linear relationship with their mass concentration and molar concentration. The relationship between the number of C, H, O atoms and CODcr is: 1 mmol (CH2O) CODcr value is 2.49±0.25 mg/L. The phenol sulfuric acid method was used to determine the sugar content. The sugar content and CODcr value of 12 kinds of sugar substances after different treatment time by ozone generator and low temperature plasma showed a downward trend. The CODcr value of the two treatments declined significantly in 10~40 minutes, and tended to be flat after 40 minutes. After 60 minutes of low temperature plasma treatment, CODcr value decreased to 42%~49% of the initial solution CODcr value, sugar content decreased to 44%~59% of the initial solution sugar content; after 60 minutes of ozone generator treatment, CODcr value decreased to 45%~53% of the initial solution CODcr value, sugar content decreased to 49%~65% of the initial solution sugar content. The results showed that the degradation effect of CODcr and the reduction of sugar content after low temperature plasma treatment were better than that of ozone generator, which indicated that low temperature plasma could degrade sugar substances in fruit processing wastewater and improve water quality.