Trinitrophenol treatment in a hollow fiber membrane biofilm reactor

2000 ◽  
Vol 41 (4-5) ◽  
pp. 235-238 ◽  
Author(s):  
S.J. Grimberg ◽  
M.J. Rury ◽  
K.M. Jimenez ◽  
A.K. Zander
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Biofilm Reactor ◽  
Pure Oxygen ◽  
Outer Diameter ◽  
Packing Factor ◽  
Membrane Biofilm Reactor ◽  
Membrane Aeration ◽  
Novel Approach ◽  
Fiber Spacing

Treatment of recalcitrant wastewaters in traditional suspended growth systems is ineffective due to the required large contact times and large aeration basins. Hollow-fiber gas permeable membranes are being investigated as a novel approach to overcome oxygen and 2,4,6-trinitrophenol (TNP) mass transfer limitations of conventional fixed film systems. Three independent hollow fiber biofilm reactors using bubbleless membrane aeration technology were used to treat TNP. The reactors contained 14, 30, or 57 fibers, with a fiber spacing of 3, 2.7, or 2.1 mm, respectively, which resulted in a packing factor of 0.5%, 1% and 2%. A pure culture of Nocardioides simplex (strain Nb), which has been shown to mineralize TNP, was immobilized on the surface of 281.5 (m outer diameter microporous fibers. Pure oxygen was supplied through the lumen of the fibers and diffused throughout the biofilm and into the reactor. Removal of TNP in the 14, 30, and 57 fiber reactors was 99.1, 83.2, and 85.4%, respectively at a contact time of approximately 14 hours and a TNP loading of 40 mg/day. Results indicate TNP diffusion into the biofilm limited performance at high substrate concentrations.

Bioreduction of para-chloronitrobenzene in a hydrogen-based hollow-fiber membrane biofilm reactor: effects of nitrate and sulfate

2013 ◽  
Vol 25 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Haixiang Li ◽  
Zhiqiang Zhang ◽  
Xiaoyin Xu ◽  
Jun Liang ◽  
Siqing Xia
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Biofilm Reactor ◽  
Fiber Membrane ◽  
Membrane Biofilm Reactor

The removal of nitrogen using an autotrophic hybrid hollow-fiber membrane biofilm reactor

Desalination ◽  
2005 ◽  
Vol 183 (1-3) ◽  
pp. 447-454 ◽  
Author(s):  
Jeong-Hoon Shin ◽  
Byoung-In Sang ◽  
Yun-Chul Chung ◽  
Youn-kyoo Choung
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Biofilm Reactor ◽  
Fiber Membrane ◽  
Membrane Biofilm Reactor

Evidence of specialized bromate-reducing bacteria in a hollow fiber membrane biofilm reactor

2009 ◽  
Vol 59 (10) ◽  
pp. 1969-1974 ◽  
Author(s):  
K. J. Martin ◽  
L. S. Downing ◽  
R. Nerenberg
Keyword(s):  
Hollow Fiber ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Selective Pressure ◽  
Hollow Fiber Membrane ◽  
Primary Electron ◽  
Biofilm Reactor ◽  
Fiber Membrane ◽  
Membrane Biofilm Reactor ◽  
Reducing Bacteria ◽  
Bromate Reduction

Bromate is a carcinogenic disinfection by-product formed from bromide during ozonation or advanced oxidation. We previously observed bromate reduction in a hydrogen-based, denitrifying hollow fiber membrane biofilm reactor (MBfR). In this research, we investigated the potential existence of specialized bromate-reducing bacteria. Using denaturing gradient gel electrophoresis (DGGE), we compared the microbial ecology of two denitrifying MBfRs, one amended with nitrate as the electron acceptor and the other with nitrate plus bromate. The DGGE results showed that bromate exerted a selective pressure for a putative, specialized bromate-reducing bacterium, which developed a strong presence only in the reactor with bromate. To gain further insight into the capabilities of specialized, bromate-reducing bacteria, we explored bromate reduction in a control MBfR without any primary electron acceptors. A grown biofilm in the control MBfR reduced bromate without previous exposure, but the rate of reduction decreased over time, especially after perturbations resulting in biomass loss. The decrease in bromate reduction may have been the result of the toxic effects of bromate. We also used batch tests of the perchlorate-reducing pure culture, Dechloromonas sp. PC1 to test bromate reduction and growth. Bromate was reduced without measurable growth. Based on these results, we speculate bromate's selective pressure for the putative, specialized BRB observed in the DGGE was not growth related, but possibly based on resistance to bromate toxicity.

scholarly journals Actual Application of a H2-Based Polyvinyl Chloride Hollow Fiber Membrane Biofilm Reactor to Remove Nitrate from Groundwater

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Yanhao Zhang ◽  
Lilong Huang ◽  
Zhibin Zhang ◽  
Cuizhen Sun ◽  
Jixiang Li
Keyword(s):  
Dissolved Oxygen ◽  
Sulfate Reduction ◽  
Oxygen Reduction ◽  
Hollow Fiber ◽  
Nitrate Reduction ◽  
Hollow Fiber Membrane ◽  
Biofilm Reactor ◽  
Contaminated Groundwater ◽  
Fiber Membrane ◽  
Membrane Biofilm Reactor

To evaluate the actual performance of the H2-based polyvinyl chloride hollow fiber membrane biofilm reactor (HF-MBfR), we used HF-MBfR to remove nitrate from the nitrate contaminated groundwater with the dissolved oxygen (~6.2 mg/L) in Zhangqiu city (Jinan, China). The reactor was operated over 135 days with the actual nitrate contaminated groundwater. The result showed that maximum of nitrate denitrification rate achieved was over 133.8 gNO3--N/m3d (1.18 gNO3--N/m2d) and the total nitrogen removal was more than 95.0% at the conditions of influent nitrate 50 mg/L, hydrogen pressure 0.05 MPa, and dissolved oxygen (DO) 6.2 mg/L, with the nitrate in effluent under the value limits of drinking water. The fluxes analysis showed that the electron-equivalent fluxes of nitrate, sulfate, and oxygen account for about 81.2%, 15.2%, and 3.6%, respectively, which indicated that nitrate reduction could consume more electrons than that of sulfate reduction and dissolved oxygen reduction. The nitrate reduction was not significantly influenced by sulfate reduction and the dissolved oxygen reduction. Based on the actual groundwater quality on site, the Langelier Saturation Index (LSI) was 0.4, and the membrane could be at the risk of surface scaling.

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