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本文应用铅离子印迹膜和设计的滤除装置,对沼液Pb(Ⅱ)进行滤除实验。研究了渗析时间(t)、跨膜压差(ΔP)、搅拌速率(ω)三因素对铅离子通量和去除率的影响,并应用L9(33)正交试验设计,对滤除工艺参数进行优化,并与吸附剂吸附法进行比较。结果表明,三因素对沼液中Pb(Ⅱ)去除率的影响顺序为:搅拌速率>跨膜压差>渗析时间。该装置的最佳滤除工艺参数为:搅拌速率=70 r/min、ΔP=0.20 MPa、t=50 min,此时沼液中Pb(Ⅱ)去除率达99%,处理后沼液中Pb(Ⅱ)为0.007 mg/L。耦合化学清洗+超声清洗污染后的铅离子印迹膜,铅离子通量基本恢复到新膜的通量(平均恢复率达98%),提升了铅离子印迹膜再生利用水平。该滤除工艺克服了吸附剂吸附法的不足,为沼液安全肥用提供一种新工艺和新技术。
In this paper, lead ion imprinted membrane and designed filter device, the biogas slurry Pb (Ⅱ) filtration experiments. The influences of three factors of dialysis time (t), transmembrane pressure difference (ΔP) and stirring rate (ω) on the lead ion flux and removal rate were studied. The orthogonal design of L9 (33) Optimized and compared with adsorbent adsorption method. The results showed that the order of influence of three factors on the removal rate of Pb (Ⅱ) in biogas slurry was as follows: stirring rate> transmembrane pressure difference> dialysis time. The optimal filtration process parameters of the device are: stirring rate = 70 r / min, ΔP = 0.20 MPa, t = 50 min, the removal rate of Pb (Ⅱ) in biogas slurry reaches 99% (Ⅱ) is 0.007 mg / L. Coupled chemical cleaning + ultrasonic cleaning of lead contaminated lead imprinted membrane, lead ion flux returned to the basic membrane flux (average recovery rate of 98%), improve the level of lead ion imprinted membrane recycling. The filtration process to overcome the lack of adsorbent adsorption method for the safe use of biogas slurry to provide a new technology and new technologies.