生物膜载体是生物膜法污水处理的关键核心部分,载体性能的优良与否直接影响着生物膜法处理污水的效果.采用超临界流体诱导相分离-循环干燥工艺,以聚甲基丙烯酸甲酯(PMMA)为溶质,丙酮为溶剂,超临界CO2为非溶剂,制备了PMMA污水处理多孔载体,采用扫描电镜对载体内部结构进行表征,考察了PMMA初始浓度、CO2压力、CO2温度、保压时间t1、干燥时间t2、卸压时间t3等操作条件对多孔载体内部结构的影响.结果表明,利用该工艺可成功制备污水处理用PMMA多孔载体,且载体孔径分布均匀、孔间连通性好、孔隙率高.实验最优操作条件为PMMA初始溶液浓度20%(质量分数),CO2压力10 MPa、温度45 ℃,t1 90 min,t2 90 min, t3 90 min.
Biofilm carrier is a key part of the biological membrane method for wastewater treatment.The performance of the carrier has a direct impact on the wastewater treatment by biological membrane method.PMMA porous carrier was prepared by supercritical fluid induced phase separation-cyclic drying process, with PMMA as model material, acetone as solvent and supercritical CO2 as non-solvent.Carrier interior structure was characterized by scanning electron microscope.The influence of operating conditions, such as PMMA concentration, CO2 pressure, CO2 temperature, pressure holding time t1, drying time t2 and pressure relief time t3, on carrier interior structure was studied.The results show that the PMMA wastewater treatment porous carrier with uniform pore size distribution, excellent connectivity and high porosity can be prepared successfully by the process.The optimal preparation conditions of this process in this work are PMMA concentration of 20wt%, CO2 pressure of 10 MPa, CO2temperature of 45 ℃, pressure holding time t1 of 90 min, drying time t2 of 90 min and pressure relief time t3 of 90 min.
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