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| 论文编号: |
122214O120110183 |
| 第一作者所在部门: |
202组 |
| 中文论文题目: |
超临界水氧化降解有毒有机废水
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| 英文论文题目: |
Destruction of Toxic Organic Wastewaters using Supercritical Water Oxidation
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| 论文题目英文: |
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| 作者: |
毕继诚
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| 论文出处: |
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| 刊物名称: |
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| 年: |
2011
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| 卷: |
0 |
| 期: |
0 |
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| 联系作者: |
毕继诚 |
| 收录类别: |
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| 摘要: |
China is facing a water crisis caused by widespread drought and pollution today. Every year the amount of wastewaters generated by industrial and domestic sources increase rapidly, 90% of groundwater is polluted, 60% of it seriously so [1]. The treatment of toxic organic wastewater is becoming more difficult and costly because of more stringent treatment standards and discharge limitation. Conventional technologies currently used to treat organic wastewaters include adsorption, biological treatment, chemical oxidation, and incineration. Each of these treatment methods has shortcomings and therefore may not be the best option for treating organic wastewaters.
In recent years, supercritical water oxidation (SCWO) process got a great attention due to its capability to treat hazardous industrial wastes and wastewaters [2,3]. At typical operating conditions, SCWO can readily achieve high destruction efficiencies (> 99.99%) of organics in short residence time (<1 min). The organics oxidized to CO2 and H2O, without the concomitant production of noxious byproducts.
In this work, toxic organic wastewaters from coke plant, coal gasification plant, F-T synthesis plant, and hospital were treated by SCWO. Experiments were carried out in a continuous-flow system with hydrogen peroxide as an oxidant. Effects of reaction temperature, pressure, excess oxygen and residence time on the destruction of organic pollutants were studied. The results indicate that the temperature, amount of oxidant and residence time have a significant effect on the degradation efficiency of organic pollutants. At properly conditions, the gas product of SCWO only contain CO2, N2 and excess O2, the pollutants concentration in effluent was far below the first grade discharge standard of China. Additionally, solid salt separation is an important engineering design issue in the SCWO process. A reverse flow vessel was applied for the separation of salt, by utilizing the insolubility character of salt in supercritical water. It was found that the separation efficiency of salt was strongly dependent on the temperature. By controlling the temperature at 500–600 oC, more than 80% of the salt in coking wastewater could be removed. The experimental results suggest that SCWO is a promising technology for the treatment of toxic organic wastewater |
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