铁还原中和沉淀法处理TNT酸性废水的研究

Study on Treating TNT Acidic Waste Water by the Process of Iron Reduction-neutralization and Precipitation

研究了处理TNT酸性废水的铁还原中和方法。该法用铁将硝基苯类还原成苯胺类,然后通过石灰乳中和生成Fe(OH)_2胶体,吸附苯胺类,达到去除硝基苯类的目的。在过量铁还原60min,中和沉淀pH8～9的最佳条件下,可将废水中的硝基苯类从82.0mg/L降到未检出程度(<0.2mg/L),COD_(Cr)从394.0mg/L降到94.8mg/L。处理后的废水中的苯胺类也未检出(<0.03mg/L)。该法的物料消耗费用约为传统的活性碳吸附法的17.5％。

In this paper, there has been studied the new process of iron reduction-neutralization and precipitation for treating TNT waste liquor containing acid. First, nitrobenzene is reduced to aniline by iron, then aniline is removed by the absorption of Fe (OH)2 colloid which is produced from neutralization of the reduced waste liquor with lime white. Under the optimum condion (excessive iron reduction time 60min, neutralization pH8 - 9 ), the concentration of nitrobenzene can be reduced to <0. 2mg/L from 82.0mg/L, CODCr reduced to 94. 8mg/L from 394. 0mg/L. Aniline is < 0. 03mg/L in the waste liquor after treament. The material expending cost of the new process is about 17. 5% of existing active carbon absorption process.