几种高盐污水超临界水法脱盐降COD实验研究

Experimental study on desalination and COD reduction of several high-salt wastewater by supercritical water method

采用超临界水氧化法(SCWO)处理煤化工、采油、食品等工业的高盐污水,研究其对不同来源的高盐污水中COD和TDS的同步去除效果。结果表明,采用SCWO处理不同来源污水时,几种污水的COD去除率均在80%以上,其中煤化工污水和三乙醇胺污水的COD去除率可以达91%以上,油田污水的COD去除率在88%以上;几种污水的TDS同步去除率均在85%以上。分析了不同来源污水的化学成分,并从有机物难降解特性角度分析了不同污水存在的超临界水氧化差异性。从超临界水特性角度分析了污水的TDS同步去除原因。

Supercritical water oxidation(SCWO)method is utilized to treat with high salinity wastewater from coal chemical,crude oil production,food processing and other industries.The effects on simultaneous removal of COD and TDS in high salinity wastewater from different sources are studied.Results show that the removal efficiencies of COD in wastewater from several different sources all exceed 80%when SCWO is used.Of which,the removal efficiencies of COD in coal chemical wastewater and triethanolamine sewage can exceed 91%,and the removal efficiency of COD in oilfield wastewater is more than 88%.Simultaneous removal efficiencies of TDS in several sources of wastewater are all above85%.The chemical composition of different sources of wastewater is detected,and oxidation effect differences of SCWO to different wastewater are explored in the perspective of the refractory characteristics of organic matters.The reasons for the simultaneous removal of TDS from wastewater are analyzed in the perspective of the characteristics of supercritical water.