A Pilot-Scale Treatment of Steel Plant Wastewater by PVDF Hollow Fiber Ultrafiltration Membrane with Low Packing Density

Separations

article

Yangang Zhang¹  Zhangfu Yuan¹  He Bai³  Linfei Zhao¹  Liudong He²  Chunhong Shi⁴ 

[1] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing;Beijing Scinor Water Technology Co., Ltd.;Beijing Scinor Membrane Technology Co., Ltd.;School of Energy and Environmental Engineering, University of Science and Technology Beijing

关键词: steel industry wastewater;    ultrafiltration;    packing density;    membrane cleaning;    membrane fouling;   

DOI  :  10.3390/separations9020037

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The treatment of wastewater from the iron and steel industry is difficult due to its complex and changeable characteristics. This paper introduces the application of polyvinylidene fluoride (PVDF)-pressurized ultrafiltration membrane with low packing density that produced via thermally induced phase separation (TIPS) in wastewater of iron and steel industry, to study the effects of packing density of ultrafiltration membrane modules as well as the membrane performance under different operation conditions, in order to provide guidance for the subsequent development of other ultrafiltration applications in wastewater of iron and steel. The results show a significant positive effect of smaller packing density on the transmembrane pressure difference (TMP) reducing and higher permeability. Under 30 min filtration cycle and 65 L m−2 h−1 (LMH) operation flux, the permeability can be stabilized to 200 L/(m2·h)/0.1 MPa, which is two times higher than that of the membrane module with 0.3 m2/m3 higher packing density under the same condition. It is obvious that compared with enhanced flux maintenance (EFM), chemically enhanced backwash (CEB) is a more effective cleaning method for iron and steel wastewater, which maintains TMP (30 kPa) without any significant increase under the premise of ensuring the high-flux (65 LMH) operation. The results also suggest reasonable parameters based on the test water quality, which include the filtration cycle and operation flux. The scanning electron microscopy (SEM) analysis and the turbidity of the permeate show that the ultrafiltration membrane has good intercept ability and high anti-pollution performance.

【 授权许可】

CC BY