CLEANING PROTOCOLS FOR FLUX RECOVERY OF A POLYETHERSULFONE MEMBRANE FOULED BY THE EFFLUENT FROM ALKALINE PEROXIDE MECHANICAL PULPING PLANTS
In order to maximize flux recovery for the alkaline peroxide mechanical pulping (APMP) plant’s effluent fouled polyethersulfone (PES) membranes, in this work, we tried to use four chemical cleaning protocols, including 0.4 wt％ sodium hydroxide + 0.1 wt％ ethylene diamine tetraacetic acid followed by 0.01 wt％ sodium dodecyl benzene sulfonate, 0.4 wt％ sodium hydroxide + 10 wt％ permeate, 0.4 wt％ sodium hydroxide + 0.1 wt％ ethylene diamine tetraacetic acid followed by 0.01 wt％ enzymatic laundry powder, and 0.2 wt％ Triton X-100 + absorbent cotton, to clean the fouled membranes. The cleaning effects were evaluated using parameters of percent flux recovery and total solids, COD and BOD retentions of membranes. Meanwhile, methods of scanning electron microscope with an energy dispersive x-ray analyzer (SEM-EDXA) were employed to give a more precise assessment and a better understanding of the cleaning processes. The results showed that, for APMP plant’s effluent fouled PES membranes, the cleaning protocol of “0.2 wt％ Triton X-100 + absorbent cotton presented a strong cleaning effectiveness that the flux of fouled membrane was recovered to 98.5％ of the pristine membrane’s, and the retentions of total solids, COD, BOD and color of cleaned membrane were approximate to those of pristine membrane. Examinations of SEM-EDXA revealed the foulants that were present and the changes in the foulant composition after cleaning for all of the PES membranes studied. The membrane cleaned with “0.2％ Triton X-100 + absorbent cotton protocol displayed images and elemental composition that were close to that of pristine membrane. This supported the flux recovery data, which indicated that membrane fouled in this way had been cleaned more effectively with “0.2％ Triton X-100 + absorbent cotton protocol than with other three cleaning protocols.
Alkaline peroxide mechanical pulping effluent membrane fouling cleaning flux recovery
Cao Chunyu Zhang Yong Hou Qingxi Feng Wenying Su Zhenhua Xu Ming Lin Qiaoyuan Lv Weijun
China National Pulp and Paper Research Institute,Beijing, 100020, China College of Material Science & Chemical Engineering,Tianjin University of Science & Technology, Tianj
国际会议
广州
英文
1175-1178
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）