scholarly journals Insights into the removal of gaseous oxytetracycline by combined ozone and membrane biofilm reactor

2021 ◽  
Vol 27 (6) ◽  
pp. 210469-0
Author(s):  
Z.S. Wei ◽  
X.L. Chen ◽  
Z.S. Huang ◽  
H.Y. Jiao ◽  
X.L. Xiao
Keyword(s):  
Molecular Structure ◽  
High Temperature ◽  
Microbial Community ◽  
Cost Effective ◽  
Biofilm Reactor ◽  
Community Diversity ◽  
Ecological Environment ◽  
The Novel ◽  
Waste Gas ◽  
Membrane Biofilm Reactor

Gaseous emerging organic compounds (GEOCs) may harm human health and ecological environment. High temperature composting of livestock manure may produce oxytetracycline (OTC) waste gas. Here, we investigated treatment OTC in waste gas by combined ozone and membrane biofilm reactor (MBfR) with desulphurizing bacteria. The performance, the microbial community, gene function and the mechanism for OTC removal in the ozone-MBfR were evaluated. The ozone-MBfR system could achieve more degradation of OTC completely than MBfR. Desulfovibrio, Lentimicrobium, Aminivibrio, Thioalkalispira, Erysipelothrix, Mangroviflexus, Azoarcus, Thauera, Geobacter, Paracoccus, and Dethiosulfatibacter were the dominant genera. Pseudomonas, Escherichia, Bacteroides, Salmonella, Paracoccus, Stappia were contribution to OTC degradation. With the addition of ozone, the community diversity increased; some genera, such as Tenericutes- uncultured, and Desulfovibrio, increased in abundance, whereas others, such as Thauera, and Petrimonas, decreased. Ozone destroyed the enol structure in OTC molecular structure and produces biodegradable products, ozone oxidation was combined with biodegradation, to achieve thoroughly degrade OTC in waste gas. The novel hybrid ozone-MBfR is a cost-effective and robust alternative to GEOCs treatment.

scholarly journals A Simple, Efficient, and Eco-Friendly Method for the Preparation of 3-Substituted-2,3-dihydroquinazolin-4(1H)-one Derivatives

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4052 ◽  
Author(s):  
Zainab Almarhoon ◽  
Kholood A. Dahlous ◽  
Rakia Abd Alhameed ◽  
Hazem A. Ghabbour ◽  
Ayman El-Faham
Keyword(s):  
Molecular Structure ◽  
Cost Effective ◽  
Environmentally Benign ◽  
Conventional Heating ◽  
Second Step ◽  
The Novel ◽  
Monoclinic Crystal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cost Effective Method

A simple, cost-effective method under environmentally benign conditions is a very important concept for the preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives. The present work describes an efficient and eco-friendly protocol for the synthesis of 2-amino-N-(2-substituted-ethyl)benzamide and 3-substituted-2,3-dihydroquinazolin-4(1H)-one derivatives. The novel feature of this protocol is the use of 2-methyl tetrahydrofuran (2-MeTHF) as an eco-friendly alternative solvent to tetrahydrofuran (THF) in the first step. In the second step, methanol in the presence of potassium carbonate as a catalyst was used under conventional heating or microwave irradiation, which provided an eco-friendly method to afford the target products in excellent yields and purities. NMR (1H and 13C), elemental analysis, and LC-MS confirmed the structures of all compounds. X-ray crystallography further confirmed the structure of the intermediate 2-amino-N-(2-substituted-ethyl)benzamide 3a. The molecular structure of 3a was monoclinic crystal, with P21/c, a = 13.6879 (11) Å, b = 10.2118 (9) Å, c = 9.7884 (9) Å, β = 105.068 (7)°, V = 1321.2 (2) Å3, and Z = 4.

Total electron acceptor loading and composition affect hexavalent uranium reduction and microbial community structure in a membrane biofilm reactor

2017 ◽  
Vol 125 ◽  
pp. 341-349 ◽  
Author(s):  
Aura Ontiveros-Valencia ◽  
Chen Zhou ◽  
Zehra Esra Ilhan ◽  
Louis Cornette de Saint Cyr ◽  
Rosa Krajmalnik-Brown ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Electron Acceptor ◽  
Microbial Community Structure ◽  
Biofilm Reactor ◽  
Uranium Reduction ◽  
Total Electron ◽  
Hexavalent Uranium ◽  
Membrane Biofilm Reactor

Microbial community structure during nitrate and perchlorate reduction in ion-exchange brine using the hydrogen-based membrane biofilm reactor (MBfR)

2010 ◽  
Vol 101 (10) ◽  
pp. 3747-3750 ◽  
Author(s):  
Steven W. Van Ginkel ◽  
Regina Lamendella ◽  
William P. Kovacik Jr. ◽  
Jorge W. Santo Domingo ◽  
Bruce E. Rittmann
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Ion Exchange ◽  
Microbial Community Structure ◽  
Biofilm Reactor ◽  
Perchlorate Reduction ◽  
Membrane Biofilm Reactor

Effect of Microbiological Additive on the Diversity of Microbial Community and the Dynamic Distribution during High-Temperature Composting Process

2012 ◽  
Vol 214 ◽  
pp. 366-369
Author(s):  
Hong Tao Li ◽  
Xiu Hong Xu ◽  
Jia Liu
Keyword(s):  
High Temperature ◽  
Microbial Community ◽  
Sequence Comparison ◽  
Thermophilic Bacteria ◽  
Degradation Process ◽  
Community Diversity ◽  
Dynamic Distribution ◽  
Microbial Community Diversity ◽  
Composting Process ◽  
High Temperature Process

The objectives of this study were to analysis the differences of microbial community diversity between the microbial additives (MA) compost and natural compost and the distribution (spatial and temporal) of MA during high-temperature composting by PCR-DGGE technology. The results showed that the MA started temperature rapidly; prolonged the time of maintained high-temperature process and increased the diversity of microbial than natural compost. Sequence comparison revealed that the microorganisms most belonged to uncultivable, thermophilic bacteria. Bacillus became the dominant microorganisms after mixed with MA. MA were found in the top and middle portions of the compost throughout nearly the entire composting process,but absent in the natural compost. Our finding represents an important step towards the understanding of MA and its function in the degradation process of compost.

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