Fouling Analysis on Polysulfone/Peg400/ZnO Membrane during Textile Wastewater Treatment

P. Aryanti, Febrianto Adi Nugroho, Gatra Buana Winiarti, Ghina Shofi Pratiwi, I. N. Widiasa
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Abstract

Fouling has become the main problem in long-term application of ultrafiltration (UF) membrane for water and wastewater treatment, significantly reducing membrane productivity. In this paper, fouling on polysulfone-based membrane was analyzed using Hermia’s model during textile wastewater treatment. The UF membrane has been prepared by blending polysulfone (PSf), acetone, and PEG400 in DMAc, with ZnO nanoparticles at a concentration of 1% by weight of polymers (PSf and PEG400). The influence of polysulfone concentration (18 and 20 wt.%) and PEG400 (0 - 25 wt.%) on fouling mechanisms was investigated. It was found that the increase of polysulfone from 18 to 20 wt.% reduced permeate flux from 54 to 25 L.m-2.h-1. Vise versa, the increase of PEG400 concentration enhanced the permeate flux. More stable flux was achieved when 18 wt.% of polysulfone was used to prepare the UF membrane. The fouling type in the UF membrane depends on the characteristics of the membrane. A significant flux decline occurred when used 20 wt.% of polysulfone without the addition of PEG400. Smaller membrane pore and higher hydrophobicity due to high polysulfone concentration induced cake layer of fouling on the membrane surface at the first 40 minutes of ultrafiltration. Further increase of operating time, internal fouling was formed due to the movement of pollutants to the permeate side caused by different concentrations. The highest color rejection (86%) was achieved when 25 wt.% of PEG400 was added in 20 wt.% of polysulfone solution.Keywords: fouling, hermia model, ultrafiltration, wastewater treatment.
聚砜/Peg400/ZnO膜在纺织废水处理中的污染分析
超滤膜长期应用于水、废水处理中存在的主要问题是污染,严重降低了膜的生产效率。采用Hermia模型对纺织废水处理过程中聚砜基膜的污染进行了分析。将聚砜(PSf)、丙酮和PEG400与氧化锌纳米粒子以聚合物(PSf和PEG400)的重量比为1%的浓度在DMAc中共混制备UF膜。考察了聚砜浓度(18和20 wt.%)和PEG400浓度(0 ~ 25 wt.%)对结垢机理的影响。结果表明,聚砜用量从18%增加到20%,使渗透通量从54 l - m-2 - h-1降低到25 l - m-2 - h-1。反之,PEG400浓度的增加使渗透通量增强。当聚砜用量为18.wt .%时,超滤膜的通量稳定。超滤膜中的污染类型取决于膜的特性。当使用20% wt.%的聚砜而不添加PEG400时,通量明显下降。超滤前40分钟,高聚砜浓度导致膜表面形成饼状污垢层,膜孔变小,疏水性提高。随着运行时间的增加,不同浓度的污染物向渗透侧移动,形成内部污垢。当25 wt.%的PEG400加入到20 wt.%的聚砜溶液中时,色差最高(86%)。关键词:污垢,hermia模型,超滤,废水处理。
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