REMOVING ACID ORANGE 7 DYE FROM WASTEWATER BY MEMBRANE BIOREACTOR (MBR): EFFECT OF AERATION MODE AND HYDRAULIC RETENTION TIME

  • Luu Tuan Duong, Le Thanh Son, Dang Thi Thom, Hoang Manh Trung, Do Xuan Truong, Dao Phuong Uyen, Nguyen Anh Dung, Nguyen Quang Phuc, Le Cao Khai
Keywords: Wastewater; Dye; Post-treatment; Acid orange 7; MBR

Abstract

A submerged membrane bioreactor (MBR, volume of 45 L) using microfiltration hollow fiber membrane with a pore size of 0.3 µm was studied to treat COD and acid orange 7 (AO7) dye  of wastewater pretreated by an ozonation process. The results show that the aeration/ non aeration time and hydraulic retention time directly affected the efficiency of COD and AO7 dye treatment. When the aeration time increased, the efficiency of COD treatment improved while the AO7 dye treatment efficiency decreased; when the hydraulic retention time was extended from 12h to 18h, the COD and AO7 dye treatment efficiency both increased, but at 24h, the COD and AO7 dye treatment efficiency was almost unchanged. Therefore, the aeration/ non aeration time of 60 min/60 min, hydraulic retention time of 18h were the optimal operating conditions for this laboratory scale MBR, then the COD and AO7 dye treatment efficiency were reached 94.7% and 83.6%, respectively.

điểm /   đánh giá
Published
2023-11-03
Issue
Vol. 228 No. 14 (2023): NATURAL SCIENCES - ENGINEERING - TECHNOLOGY
Section
NATURAL SCIENCE – ENGINEERING – TECHNOLOGY