旋转填料床中活性炭吸附含酚废水研究

以旋转填料床(RPB)作为吸附设备,活性炭为吸附剂处理模拟含酚废水,考察了转速、液体流率及初始浓度等因素对苯酚去除率的影响,确定适宜操作条件;分别采用拟一级和拟二级动力学模型研究了吸附动力学,并考察了各因素对吸附速率常数的影响;在相同操作条件下就去除率和速率常数与传统吸附法进行对比。结果表明:超重力因子为44.68、液体流率为35 L·h~(-1)时,处理初始浓度为1000 mg·L~(-1)苯酚废水,吸附2 h后,苯酚去除率最大,为90%左右,相同操作条件下较传统吸附法提高了30%;拟二级动力学模型线性拟合得到的吸附速率常数随着超重力因子以及液体流率的增大而增大,并得到最适宜操作条件下旋转填料床吸附法和传统吸附法的动力学方程分别为t/qt=0.02648+0.77932t和t/qt=0.02869+1.55707t,吸附速率常数较传统吸附法而言,由5.28×10~(-4)提高到9.02×10~(-4)。

Adsorption of Phenol on Activated Carbon in Rotating Packed Bed

Rotating packed bed(RPB)was applied in adsorption removal of phenol from simulation wastewater, with the activated carbon as adsorbent. The influence of operating parameters of RPB on removal efficiency such as high gravity factor, flow rate and initial concentration of phenol wastewater were examined to determine the optimum operating conditions. The pseudo-first-order model and the pseudo-second-order model were used to study the adsorption kinetics. The effect of operating parameters on the adsorption rate constant were studied. The removal efficiency and adsorption rate constant were compared with those of traditional adsorption method. Results show that under the operational conditions: high gravity factor of 44.68, flow rate of 35 L·h^-1, initial concentration of phenol wastewater of 1000 mg·L^-1, the adsorption time of 2 h, the removal efficiency of phenol can reach maximum about 90%, which is 30% higher than the traditional adsorption method. The adsorption rate constant obtained by pseudo-second-order model increases with the increasing of high gravity factor and flow rate. The kinetics equations in RPB and traditional adsorption method under the optimum condition are as follows: t/q_t=0.02648+0.77932t, t/q_t=0.02869+1.55707t,and the adsorption rate constant improves from 5.28×10^-4 to 9.02×10^-4.