二氧化氯/活性炭催化氧化处理对硝基苯甲酸废水影响因素

以对硝基苯甲酸废水为处理对象,分别考察了活性炭投加量、二氧化氯投加量、pH值及反应时间等因素对二氧化氯/活性炭催化氧化工艺处理对硝基苯甲酸废水的影响.并在最优条件下,通过试验考证了该工艺作为高浓度对硝基苯甲酸废水的预处理手段,在去除废水中COD和提高可生化性(BOD5/COD)方面的综合效果.结果表明,采用ClO2与活性炭组成催化氧化体系,其处理COD为109印mg·L-1,的对硝基苯甲酸废水,效率比单独使用二氧化氯高10%;在废水pH值为4.1时,当活性炭投加量为200 g·L-l、反应时间30 min、二氧化氯投加量为300 mg·L-1,时,废水的COD降至7 100 mg·L-1,去除率达到35%, BOD5浓度提高到1 810 mg·L-1,废水的BOD5/COD值由原来的0.10提高到0.25,明显提高了废水的可生化性.因此,二氧化氯/活性炭催化氧化工艺是预处理高浓度对硝基苯甲酸废水的有效手段.

Influencing Factors on the Paranitrobenzoic Acid Wastewater Treatment by Chlorine Dioxide and Activated Carbon Catalysis-Oxidation Technology

The effect of activated carbon dosage, chlorine dioxide dosage, pH value and reaction time on the paranitrobenzoic acid wastewater treatment by chlorine dioxide (ClO2) and activated carbon (AC) catalysis-oxidation technology were analyzed, and the efficiencies of the process to remove COD and increase biodegradation capacity (BOD5/COD ratio) were also examined under the optimum conditions as the pretreatment method for paranitrobenzoic acid wastewater with high-concentration. The result showed that the COD removal efficiency of the ClO2/AC catalysis-oxidation system was 10% higher than that of the system with only ClO2 when the COD concentration of paranitrobenzoic acid wastewater was 10960mg/L. It was also found that the COD removal was decreased by 35% with the concentration of 7100mg/L under the conditions of pH value=4.1, AC dosage=200g/L, reaction time=30min and ClO2 dosage=300mg/L. In addition, the BOD concentration was increased to 1810mg/L and the biodegradability was improved greatly with the BOD5/COD ratio increased from 0.10 to 0.25. In a word, the chlorine dioxide (ClO2) and activated carbon (AC) catalysis-oxidation process is an effective pretreatment method for paranitrobenzoic acid wastewater treatment.