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科技导报  2015 

有机废水过热近临界水氧化技术

DOI: 10.3981/j.issn.1000-7857.2015.03.003, PP. 24-28

Keywords: 有机废水处理,过热近临界水氧化,超临界水氧化

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Abstract:

根据超临界水氧化处理废水反应效率的影响机理,增加温度能明显促进反应速率,降低压力可以减小反应器壁厚、降低设备投资和运行成本、减缓腐蚀。通过实验研究了在水的过热近临界区域对废水氧化处理的可行性。选择焦化废水、青霉素废水、造纸厂废水、丙烯腈废水、TNT废水5种较难降解的典型有机废水进行净化处理实验。实验温度为420~530℃,压力为21~26MPa。实验结果表明在恒压下随着温度增加,5种典型废水的化学需氧量(CODcr)净化率都迅速增加;在恒温下随着压力增加,5种典型废水的CODcr净化率只稍有上升;随着温度增加,不同压力下系统反应出水CODcr的差值和净化率的差值都在逐渐减小。在温度520~530℃,压力21MPa时5种典型废水净化后的CODcr值均小于200mg/L。通过对过热近临界水氧化技术的技术经济性分析,从工程实际考虑,对工业有机废水处理更适宜采用过热近临界水氧化技术,而不是超临界水氧化技术。

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