层层自组装纳滤膜处理氨氮废水的研究

Study on the Treatment of Ammonia-Nitrogen Wastewater of Layer-by-Layer Self-Assembly Nanofiltration Membrane

概述氨氮废水的来源及危害和纳滤分离技术体系,以聚砜超滤膜为基膜,聚苯乙烯磺酸钠(PSS)和聚二甲基二烯丙基氯化铵(PDADMAC)为阴、阳离子聚电解质,采用静态层层自组装制备技术制备出纳滤膜。实验结果表明,所制备的(PDADMAC/PSS)6纳滤膜在0.4 MPa下对2 g/L Na2SO4的截留率可达89.6%,溶液通量达60.2 L/m2?h左右,对2 g/L NaCl的截留率为10%左右,溶液通量达63.5 L/m2?h。FE-SEM和AFM表明,所制备的自组装纳滤膜膜面光滑,粗糙度较小仅为36.934 nm。向料液中添加表面活性剂SDS的,实现了对氨氮的截留,0.40 Mpa下截留率均可达到30%以上。

The source and detriment of the ammonia-nitrogen wastewater and nanofiltration separation tech-nology system are summarized. Polyelectrolyte multilayer nanofiltration membranes were made by static layer-by-layer self-assembly preparation process on polysulphone (PS) ultrafiltration base membrane. The results showed that the rejection of 2 g/L Na2SO4 was 89.6% and membrane flux was 60.2 L/m2?h, and the rejection of 2 g/L NaCl was about 10%, while the flux could reach 63.5 L/m2?h for the best case. The FE-SEM and AFM of the static MPFs indicated that the prepared NF membrane surface was relatively uniform and with no defect, and the roughness was about 36.934 nm. SDS, a surface-active agent, is added to the ammonia wastewater. This method implements the interception of ammonia nitrogen;the rejection rate can reach more than 30% under 0.4 MPa.