活性炭催化臭氧氧化处理低浓度氨氮废水

摘要

Low-concentration ammonia nitrogen wastewater was treated by catalytic ozonation process with activated carbon. The factors affecting the treatment effect were studied. The experimental results show that: Activated carbon has a significant catalytic effect on ozonation and can improve the utilization of ozone; Under the condition of high pH, OH- can improve the decomposition of ozone and the generation of o OH, which is in favor of ammonia nitrogen removal with strong oxidation property and fast reaction rate; The increasing of ozone flow can weaken the resistance in the gas-liquid mass-transfer process and increase the removal rate of ammonia nitrogen; Under the conditions of initial ammonia nitrogen mass concentration 35 mg/L, activated carbon dosage 10.0 g/L, ozone flow 30 mg/min, simulated wastewater pH 11.0 and reaction time 90 min, the removal rate of ammonia nitrogen can reach 97.6%, which' is much higher than those by activated carbon adsorption or ozonation.%采用活性炭催化臭氧氧化法处理低浓度氨氮废水,考察了模拟废水pH、活性炭加入量、臭氧流量等因素对处理效果的影响.实验结果表明:活性炭对臭氧有明显的催化作用,并可提高臭氧的利用率；在高pH条件下,OH-能促进臭氧分解生成·OH,·OH氧化性强且反应速率快,有利于氨氮的去除；增大臭氧流量可减小气液传质过程中的阻力,使氨氮去除率增加；在初始氨氮质量浓度为35 mg/L、活性炭加入量为10.0 g/L、臭氧流量为30 mg/min、模拟废水pH为11.0的条件下,反应90 min后,氨氮去除率可达97.6％,相对于单独活性炭吸附和臭氧氧化过程,氨氮去除率有了显著提高.