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

摘要:

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。

Abstract: 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.