改性粉煤灰处理有机废水的试验研究

针对某电厂粉煤灰,采用三种不同的方法对其进行改性,用于对某石化厂有机废水吸附处理实验,考察了不同加入量和不同温度下的处理效果,分别测定COD和氨氮的去除率,评定改性后粉煤灰的处理效果,同时与颗粒状活性炭的吸附效果进行对比。结果表明,加入量在15-20 g/L时处理效果达到最佳。随着温度的升高,这些吸附材料的吸附能力都是先增加后减小,在20℃左右达到最佳值,且温度对粉煤灰去除氨氮的影响要比对去除COD的影响显著得多。采用NaCO3混合焙烧,H2SO4酸化改性的粉煤灰处理效果最佳,COD去除率可达到76.9%,比改性前提高了9.8%,氨氮去除率可达35.9%,比改性前提高了32.8%,且比同样含量的活性炭对氨氮的去除效率更高。

Testing Study of Organic Wastewater Treatment by Modified Fly Ash

In the paper,the organic wastewater from petrol chemical plant is treated by modified fly ash three by different methods from an electric power plant.The removal rate of COD and ammonia-nitrogen is measured to evaluate the effect of treatment.And active carbon is used as a reference.The level of fly ash and systemic temperature are researched to investigate the treatment effect.The results show that the best treatment effect appeared when the level of fly ash reached 15-20g/L.As for systemic temperature,the adsorption capacity of all those adsorbents is increased and then decreased as the temperature increased,at about 20 ℃ to achieve the best value.The systemic temperatures affect ammonia nitrogen removal evidently more than the COD removal.the best kind of modified fly ash evaluated by wastewater treatment effect is the fly ash modified by mixed roasting with NaCO3 and H2SO4 acidification treatment,COD removal rate can reach 76.9%,than that of the unmodified 9.8%,the ammonia nitrogen removal rate is up to 35.9%,than that of the unmodified 32.8%,and compared with the same content of activated carbon on the ammonia the removal efficiency can be higher.