采用络合萃取法处理高浓度H酸废水，考察了萃取体系、萃取时间、萃取级数、萃取剂体积分数、相比（A/O）、油碱比对COD的去除效果的影响。最佳体系为：三辛胺为络合剂，煤油为稀释剂，正辛醇为助溶剂。以三辛胺/煤油/正辛醇体系进行萃取实验，得到最优工艺参数为：V（三辛胺）/V（煤油）=1/4，相比（A/O）=5/1，pH=2.3，萃取时间为30 min；当H酸初始COD为35 000 mg/L时，经两级错流萃取后COD去除率可达到83.4%。采用12.5%的NaOH溶液对萃取相进行反萃取，可回收并循环利用萃取剂。实验结果表明：络合萃取工艺处理H酸生产废水效果显著，达到了预处理的目的，有利于实现工业化生产。

The complex extraction method is used to treat with high concentration H-acid wastewater.The influences of the extraction system,extraction time,numbers of extraction stages,the concentration of extractant,the phase ratio (aqueous/organic) and the ratio of oil to alkali on the removal efficiency of COD are studied.The optimal extraction system is as follows:trioctyl amine (TOA) as extractant,kerosene as diluting agent and n-octanol as co-solvent.The TOA/kerosene/octanol extraction system is used to carry out extraction test,the optimum process parameters obtained include that v(TOA):v(kerosene)=1:4,phase ratio (A/O) is 5/1,pH is 2.3,and extraction time is 30 minutes.If the initial COD value in H-acid is 35 000 mg·L^-1,the overall removal rate of COD can reach 83.4% after experiencing two-stage cross flow extraction.Finally,the extractant can be regenerated by reverse extraction process using 12.5% NaOH solution.The results show that the effect using complex extraction to treat with H-acid wastewater is very significant,and it can achieve the purpose of the pretreatment and benefit the industrial production.

孙楠(1987-),女,硕士研究生,主要从事水体污染控制技术研究,sunnan0525@126.com