用硫酸改性粉煤灰处理含磷废水的研究

以硫酸对粉煤灰进行改性用于含磷废水的净化,考察了pH值,吸附剂用量,磷初始浓度,反应时间、反应温度对净化过程的影响。通过实验发现溶液pH值在8~11范围内对磷的吸附过程影响不显著,改性粉煤灰可以在较宽的pH值范围内进行脱磷处理;随着粉煤灰加入量的增加和初始溶液中磷酸根浓度的降低,磷的净化率逐渐增加。对于含磷<80 mg/L的溶液,当粉煤灰的投加量为3%时,反应温度40℃,磷的吸附效率可达97.6%。改性粉煤灰对水中磷的净化过程速度较快,30~40 min可达到最大净化率。

Study on the Treatment of Phosphate-containing Wastewater by Sulphurc acid Modified Fly Ash

The fly ash was modified by the solid state reaction with sulphurc acid for the removal of phosphate from waste water.The effects of pH , adsorbent dosage , initial phosphate concentration , reaction time, reaction temperature on the removal of phosphate from waste water were studied.The results showed that in the range of 8 ~11 , pH did not significantly affected the removal of phosphate , and the modified fly ash could be used for the treatment of waste water in a relatively wide pH range.The removal percentage of phosphate increased with the increase of adsorbent dosage and the decrease of initial phosphate concentration.When the initial phosphate concentration was ＆lt;80 mg/L, the adsorbent dosage was 3%and reaction temperature was 40 ℃, the removal percentage of phosphate was 97.6%.The adsorption of phosphate by modified fly ash was rapid and the removal percentage of phosphate could reach maximum in 30~40 min.