【摘要】 采用批量平衡法,研究了水体磷浓度、干渣粒径和温度对干渣吸附除磷效果的影响,探讨了干渣对水体中磷素的选择性吸附特征及其饱和吸附磷素后的解吸释磷现象。结果表明,溶液浓度越高,干渣吸附除磷速率越慢,效率越低。磷浓度为6和12mg·L-1时,作用20h后,除磷效率可达90%。干渣粒径越小,除磷速率越快,效果也越好,磷浓度为12mg·L-1,吸附平衡后,30、60和100目干渣的除磷效率分别为80%、93%和96%。温度对干渣除磷效果的影响较大,磷浓度为12mg·L-1,25和35℃时,除磷效率可达95%,但在5℃时,除磷效率仅为75%。干渣能够选择性地吸附去除水体中的磷素,适宜作为除磷吸附剂,处理多种含磷污水。更多还原

【Abstract】 The blast furnace slag used as adsorbent were tested to remove phosphorus from wastewater.Phosphorus removal capacity of blast furnace slag was identified as a function of temperature,adsorbent particle size,and initial phosphorus concentration in batch tests.In addition,desorption ability and selectivity of phosphorus adsorption were investigated.The results showed that the removal of phosphorus increased with the decrease of adsorbent particle size and initial phosphorus concentration.At the initial phosphorus concentrations of 6 and 12 mg·L-1,after 20 h,the removal rate of phosphorus is 90%.At the initial phosphorus concentration of 12 mg·L-1,after the adsorption equilibrium,the removal rate of phosphorus by the adsorbent with different particle sizes,0.55,0.25 and 0.15mm,are 80%,93% and 96%,respectively.Temperature has an effect on phosphorus adsorption.The removal rate of phosphorus is 95% at 25 and 35℃,but only 75% at 5 ℃.The insignificant effect of Cl-,SO2-4,NO-3 and CO2-3 on phosphorus adsorption capacity indicates that blast furnace slag could selectively adsorb phosphorus in complex solutions.The ability of the slag for phosphorus desorption is about 14.52%,indicating that the phosphorus adsorption on blast furnace slag is not completely reversible and the bonding between the sample particles and adsorbed PO3-4 is likely strong.The low cost and high capacity of blast furnace slag makes it attractive adsorbent for the removal of phosphorus from wastewater.更多还原