Simultaneous removal of chromate and nitrate in a packed-bed bioreactor using biodegradable meal box as carbon source and biofilm carriers

2016 ◽  
Vol 207 ◽  
pp. 308-314 ◽  
Author(s):  
Jie Li ◽  
Ruofei Jin ◽  
Guangfei Liu ◽  
Tian Tian ◽  
Jing Wang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Packed Bed ◽  
Simultaneous Removal ◽  
Packed Bed Bioreactor ◽  
Biofilm Carriers

scholarly journals Surveying Denitrification Efficacy in Up-Flow Packed Bed Bioreactor Operated under Heterotrophic Condition Using Autotrophic Bacteria

2019 ◽  
Author(s):  
Ali Asghar Neshat ◽  
Abdomajid Gholizadeh ◽  
Babak Jahed ◽  
Pouria Nikvand
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
High Efficiency ◽  
Nitrate Removal ◽  
Packed Bed ◽  
Critical Issue ◽  
Pilot Scale ◽  
Aqueous Environment ◽  
Packed Bed Bioreactor ◽  
Autotrophic Bacteria

Introduction: The biological denitrification process is an interesting cost-effective technique to remove nitrate from water supplies. Acetic acid can be used as a carbon source in this process, but its consumption rate is a critical issue and, in some cases, it is quite different from stoichiometric constants. The current study aimed to investigate the nitrate removal in an up-flow packed bed bioreactor. Furthermore, various parameters affecting this process were investigated and optimized. In this study, the autotrophic bacteria were used for the heterotrophic process. Materials and Methods: Initially, the autotrophic bacteria were cultured and used for the following heterotrophic conditions in distinct reactors. A pilot-scale anoxic up flow bioreactor packed was constructed using the polyethylene media and applied to remove nitrate from the aqueous environment. Consequently, the effects of hydraulic retention times (HRT) and different acetic acid concentrations as carbon source were evaluated. During the study, the amounts of alkalinity, pH, temperature, and nitrate were checked. Results: The designed bioreactor removed an average of over 88% of nitrate, while the acetic acid consumption was 2 mg/mg NO3-N, which was lower than the stoichiometric constant for heterotrophic process. Moreover, in the three studied HRTs (1.5, 3, and 5 h), the Alkalinity increased from 14.2 to 19.8 %. Conclusion: The results of this study showed high efficiency in nitrate removal via heterotrophic denitrification using acetic acid as carbon source for autotrophic bacteria.

Three-dimensional CFD simulation of anaerobic reactions in a continuous packed-bed bioreactor

2021 ◽  
Author(s):  
Sasan Zarei ◽  
Seyyed Mohammad Mousavi ◽  
Teimour Amani ◽  
Mehrdad Khamforoush ◽  
Arezou Jafari
Keyword(s):  
Cfd Simulation ◽  
Three Dimensional ◽  
Packed Bed ◽  
Packed Bed Bioreactor

Toxicity and recalcitrant compound removal from bleaching pulp plant effluents by an integrated system: anaerobic packed-bed bioreactor and ozone

2010 ◽  
Vol 61 (1) ◽  
pp. 199-205 ◽  
Author(s):  
T. R. Chaparro ◽  
C. M. Botta ◽  
E. C. Pires
Keyword(s):  
Pulp Mill ◽  
Packed Bed ◽  
Ultraviolet Absorption ◽  
Integrated System ◽  
Packed Bed Bioreactor ◽  
Cellulose Pulp ◽  
Adsorbable Organic Halides ◽  
Organic Halides ◽  
Before And After ◽  
Absorption Measurements

Effluents originated in cellulose pulp manufacturing processes are usually toxic and recalcitrant, specially the bleaching effluents, which exhibit high contents of aromatic compounds (e.g. residual lignin derivates). Although biological processes are normally used, their efficiency for the removal of toxic lignin derivates is low. The toxicity and recalcitrance of a bleached Kraft pulp mill were assessed through bioassays and ultraviolet absorption measurements, i.e. acid soluble lignin (ASL), UV280, and specific ultraviolet absorption (SUVA), before and after treatment by an integrated system comprised of an anaerobic packed-bed bioreactor and oxidation step with ozone. Furthermore, adsorbable organic halides (AOX) were measured. The results demonstrated not only that the toxic recalcitrant compounds can be removed successfully using integrated system, but also the ultraviolet absorption measurements can be an interesting control-parameter in a wastewater treatment.

Production of HIV-1 gp120 in Packed-Bed Bioreactor Using the Vaccinia Virus/T7 Expression System

2000 ◽  
Vol 16 (5) ◽  
pp. 744-750 ◽  
Author(s):  
Y.-C. Hu ◽  
J. Kaufman ◽  
M.W. Cho ◽  
H. Golding ◽  
J. Shiloach
Keyword(s):  
Vaccinia Virus ◽  
Expression System ◽  
Packed Bed ◽  
Packed Bed Bioreactor ◽  
T7 Expression System ◽  
Hiv 1
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