臭氧催化氧化-活性炭吸附处理DDNP废水

摘要

DDNP wastewater was treated by ozone catalyzed oxidation and activated carbon adsorption. Experimental results show that compared with ozone oxidation alone,adding the catalyst can improve the oxidation efficiency of ozone in acidic environment of the later stage reaction. Fe-activated carbon was used as catalyst in experiment. When aeration rate is 70 L/min,and concentration of ozone is 11. 5mg/L,COD,chromaticity color,nitro-phenolic compounds degradation rates of the wastewater could respectively reach to 72. 6%,94. 3% and 80. 6% after 1 h treatment. The wastewater after treat-ment by activated carbon adsorption and zone catalyzed oxidation could meet to “weapons industrial water pollution dis-charge standards”. When the water quality was beyond standard because of the saturated activated carbon,ozone was used to regenerate activated carbon for 20min for 10 times. Then,COD in the yielding water is stable at 131. 47-152. 96 mg/L,chromaticity color and concentration of nitro-phenolic compounds are below the emission standard. The treatment effect is good,and the materials could be reused.%采用臭氧催化氧化-活性炭吸附方法处理DDNP废水，与单独臭氧氧化相比，催化剂的加入可以提高反应后期酸性环境下臭氧的氧化效率。试验选用Fe-活性炭催化组合，在曝气量为70 L/min，臭氧质量浓度为11.5 mg/L的情况下处理500 mL废水，1 h后废水中 COD、色度、硝基酚类化合物去除率分别达到72.6％、94.3％、80.6％；活性炭吸附处理臭氧催化氧化后DDNP废水可达到«兵器工业水污染排放标准»。当活性炭饱和导致水质超标时，采用臭氧对活性炭进行再生20 min，经反复10次试验，出水水质中COD稳定在131.47~152.96 mg/L，色度和硝基酚类化合物的含量低于排放标准，处理效果良好，具有可重复性。