正渗透去除微塑料效能及其响应面法优化  

Removal Efficiency of Micro Plastics by Forward Osmosis and Its Optimization by Response Surface Methodology

作　　者：魏永[1,2] 罗政博 李贤建 郭子寅 李克英 WEI Yong;LUO Zhengbo;LI Xianjian;GUO Ziyin;LI Keying(School of Environmental Science and Engineering;School of Urban Construction,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学环境科学与工程学院 [2]常州大学城市建设学院,江苏常州213164

出　　处：《水处理技术》2023年第4期78-82,88,共6页Technology of Water Treatment

基　　金：2022年江苏省科技副总项目(FZ20220784);常州市社会发展科技支撑计划(CE20195032)。

摘　　要：试验选取PET塑料颗粒作为去除目标物,NaCl溶液为汲取液,分别考察正渗透膜通量变化及对PET颗粒的去除影响因素分析。结果表明:增大汲取液浓度、运行温度、膜面流速和PET粒径均能显著提高膜通量,且其总膜比通量也较大,但与膜通量衰减存在一定交互作用;试验周期内,在汲取液中未检测到PET颗粒,去除率可达100%。去除率分别由膜截留率及装置系统吸附率贡献,两者占比在各去除影响因素分析中有所变化,其中汲取液浓度、膜面流速和粒径对吸附率去除贡献比影响较大,而温度对其影响不显著,且相关性不强;最后用响应面法优化汲取液浓度、膜面流速和温度对总膜比通量的影响。回归模型分析表明三种影响因素影响程度为:1)在低膜面流速的条件下汲取液浓度>膜面流速>温度;2)在高膜面流速的条件下汲取液浓度>温度>膜面流速。优化方案模型的模拟预测值与实验测试值基本吻合。Plastic particles of PET were selected as the removal target,and NaCl solution was used as draw solution in this experiment.The results showed that increasing the concentration of draw solution,operation temperature,surface velocity of the membrane,and particle size of PET could significantly increase the membrane flux,and the ratio of total membrane flux was also larger,but it interacts with the attenuation of membrane flux.However,there was a certain interaction with membrane flux decline.During the test period,no PET particles were detected in the draw solution,and the removal rate could reach 100%.The removal rates were contributed by the membrane rejection and adsorption rates of the device system respectively.The proportions of the two influencing factors have changed in each removal analysis.Among them,the concentration of the draw solution,the membrane surface velocity and the particle size of PET have great influences on the contribution ratio of the adsorption removal rate.The effect of temperature on the total specific flux was not a significant and strong correlation.Finally,the response surface method was used to optimize the effects of the concentration of the draw solution,the membrane surface velocity and the temperature on the total specific flux.The regression model analysis showed that the influence degree of the three influencing factors was:1)draw solution concentration>membrane surface velocity>temperature under the condition of low membrane surface velocity;2)draw solution concentration>temperature>membrane surface velocity under the condition of high membrane surface velocity.The simulation prediction value of the optimization scheme model was basically consistent with the experimental value.

关 键 词：正渗透 微塑料 PET 膜通量 响应面 

分 类 号：TQ028.8[化学工程]