Novel application of bamboo-based fibers in a biological contact oxidation process.
Generally, biofilm-supporting carriers in biological contact oxidation processes are made from thermoplastic polymers, which cause potential ecological damage because of the low biodegradation and high accumulation in organisms. Thus, four bamboo-based fibers, bamboo primitive fiber, bamboo fiber, bamboo charcoal fiber (BBF) and bamboo charcoal-cotton blending fiber (BCBF), were used as carriers and compared with two commercial carriers (vinylon (VY) and polypropylene (PP)) in a biological contact oxidation process system with the goal to develop a biodegradable and sustainable biofilm medium. Under steady state conditions, pollutants (chemical oxygen demand and NH4(+)-N) in stage 1 (days 1-29, hydraulic retention time (HRT) = 12 h) were efficiently removed with a removal efficiency ranging from 85 to 95%. In stage 2 (days 30-53, HRT = 4-12 h), the pollutant-removal efficiency of four reactors (BBF, BCBF, VY and PP) were nearly indistinguishable and were higher than the two other reactors, especially when the HRT was set at 4 h (days 46-53). Consequently, two optimized bamboo-based fibers (BBF and BCBF) can be developed as biofilm carriers for wastewater treatment in the future. Furthermore, studies demonstrated that the biofilm development difference showed good correlation with their specific area and relative oxygen content but not with their tenacity and antimicrobial activity.
College of Life Science, Jinggangshan University, Ji'an 343009, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: hxf@tongji.edu.cn.
Xiaoming
X
Zou
College of Life Science, Jinggangshan University, Ji'an 343009, China.
Yi
Y
Feng
College of Life Science, Jinggangshan University, Ji'an 343009, China.
Changming
C
Sheng
College of Life Science, Jinggangshan University, Ji'an 343009, China.
Jia
J
Liu
College of Life Science, Jinggangshan University, Ji'an 343009, China.
Lijun
L
Lu
College of Life Science, Jinggangshan University, Ji'an 343009, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: hxf@tongji.edu.cn.
Cui
C
Hu
College of Life Science, Jinggangshan University, Ji'an 343009, China.
Xiangfeng
X
Huang
D031723:Bambusa; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D010084:Oxidation-Reduction; D018508:Water Purification / Q000295:instrumentation*