摘要
采用废弃花生壳对质量浓度为20 mg/L的Cr(Ⅵ)模拟水样进行动态吸附实验研究。结果表明:在室温条件下,用粒径为1.6～2.5 mm花生壳作吸附剂,用量为5.0 g,介质pH值为1.0,流量为3 mL/min,吸附后水样中Cr(Ⅵ)的去除率可以达到99.08%,Cr(Ⅵ)质量浓度为0.184 mg/L,满足GB 8978—1996《污水综合排放标准》的标准。对模型的拟合结果表明,Thomas模型能较好地反映吸附过程特征,花生壳饱和吸附容量为9.4 mg/g。从动态吸附穿透曲线中可见,219 min时达到吸附穿透点,1312 min时达到吸附衰竭点。
The treatment of simulated wastewater, which had a concentration of Cr（ VI ） of 20 mg/L, with peanut shells was studied through dynamic absorption experiments under different conditions. The results show that the removal rate of Cr（V[） reached 99.08% when the diameter was 1.6 to 2. 5 ram, the adsorbent dosage of peanut shells was 5.0 g, the optimum condition was pH = 1.0, and the flow rate was 3.0 mL ~ min-l. The concentration of Cr（ VI ） was 0. 184 mg/L after adsorption, meeting the Integrated Wastewater Discharge Standard （GB8978- 1996）. The model fitting is explained in the paper. The Thomas model can well reflect the characteristics of the adsorption process, and the saturated adsorption capacity of peanut shells was 9.4 mg/g. It can be seen from the dynamic adsorption breakthrough curve that the penetrative point and the failure point were reached at 219 rain and 1312 rain, respectively.
出处
《水资源保护》
CAS
2013年第1期87-90,共4页
Water Resources Protection
基金
国家自然科学基金(51168013)
关键词
吸附
花生壳
模拟废水
CR(VI)
adsorption
peanut shell
simulated wastewater
Cr（ VI ）
