过硫酸铵氧化处理高浓度含硫废水的研究

采用过硫酸铵氧化法在常温常压下对实验室模拟的高浓度含硫废水进行处理;考察了原料配比、过硫酸铵加入方式、初始pH和反应时间对硫化物去除效果的影响,对氧化产物进行了元素分析,探讨了硫化物氧化过程动力学。实验结果表明,在n(过硫酸铵)︰n(硫化钠)=1.5、均分多次地加入现配的过硫酸铵溶液、初始pH为7、反应时间25 min的条件下,废水中硫化物的质量浓度由1 100 mg/L降至1.202 mg/L,硫化物去除率高达99.89%,达到了气田回注水标准;过硫酸铵对硫化物的氧化过程符合表观二级反应动力学规律,其确定系数R2=0.949,表明利用过硫酸铵氧化处理高浓度含硫废水切实可行;氧化产物中C,H,N,S,O元素的质量分数分别为0.261%,0.607%,1.949%,91.026%,2.096%,且氧化产物的收率达到86.97%。

Treatment of High Concentration Sulfide Wastewater by Ammonium Persulfate Oxidation Method

Treatment of high concentration sulfide wastewater by oxidation with(NH4)2S2O8 was investigated in laboratory-scale experimental apparatus under the conditions of atmospheric pressure and room temperature.The effects of mole ratio of(NH4)2S2O8 to Na2S,(NH4)2S2O8 feeding mode,initial pH and reaction time on the sulfide removal efficiency were studied.The oxidation products were determined by elemental analysis.The kinetics of the sulfide oxidation was studied.The results indicated that under the optimal conditions of n((NH4)2S2O8)︰n(Na2S)1.5,(NH4)2S2O8 aqueous solution feeding for several times,initial pH 7 and 25 min,the sulfide concentration could be decreased from 1 100 mg/L to 1.202 mg/L,and the sulfide removal rate could reached 99.89%,which could meet the requirements of reusing the oilfield wastewater.The sulfide oxidation by ammonium persulfate followed the second-order reaction kinetics under the optimal conditions and the coefficient of determination was 0.949.The contents of C,H,N,S and O elements in the oxidation products were 0.261%,0.607%,1.949%,91.026% and 2.096% respectively,and the oxidation product yield reached 86.97%.