硫酸氧化法工艺处理对硝基苯甲酸废水

Treatment of Nitrobenzoic Acid Wastewater by Using the Process of Sulfuric Acid Oxidation

采用硫酸氧化法将对硝基苯甲酸废水进行氧化处理,研究了温度对釜液、馏分CODCr、釜液硫酸浓度的影响,采用发光细菌法评价处理前后水样的急性毒性变化,探究了硫酸氧化处理对硝基苯甲酸废水的反应机理.结果表明,硫酸氧化法可有效降解p-NBA废水,当温度从60℃升至300℃时,釜液和馏分的CODCr由11 230 mg/L分别降至366. 5 mg/L和1 200 mg/L,最终CODCr去除率达到96. 74%,水样的急性毒性降低82. 53%. p-NBA在硫酸氧化的作用下,把羧酸基脱去,进而转化为硝基苯,硝基苯开环裂解,最后被彻底氧化成CO_2和H_2O,硫酸还原为SO_2.

The Nitrobenzoic acid wastewater was treated by using the process of sulfuric acid oxidation.The effects of temperature on the concentration of residue,distillate CODCr,and residue-sulphuric acid were studied.The acute toxicity changes of water samples before and after treatment were evaluated by luminescent bacteria method,and the reaction mechanism of sulfuric acid oxidation treatment of p-nitrobenzoic acid wastewater was explored.The results show that sulfuric acid oxidation can effectively degrade p-NBA wastewater.When the temperature rises from 60 ℃ to 300 ℃,the CODCrof residue and distillate decreases from 11 230 mg/L to366.5 mg/L and 1 200 mg/L respectively.The final CODCrremoval rate reaches 96.74%,and the acute toxicity of water sample decreases by 82.53%.Under the action of sulfuric acid oxidation,p-NBA removes the carboxylic acid group and converts it into nitrobenzene.Nitrobenzene is cracked by ring opening,and finally oxidized thoroughly to CO2 and H2O,and sulfuric acid is reduced to SO2.