Simultaneous Bromate and Nitrate Reduction in Water Using Sulfur-Utilizing Autotrophic and Mixotrophic Denitrification Processes in a Fixed Bed Column Reactor

2014 ◽  
Vol 42 (9) ◽  
pp. 1185-1189 ◽  
Author(s):  
Sevgi Demirel ◽  
İbrahim Uyanık ◽  
Adem Yurtsever ◽  
Hakan Çelikten ◽  
Deniz Uçar
Keyword(s):  
Nitrate Reduction ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Column Reactor

Adsorptive Removal of Pentachlorophenol by Anthracophyllum discolor in a Fixed-Bed Column Reactor

2011 ◽  
Vol 223 (5) ◽  
pp. 2463-2472 ◽  
Author(s):  
Olga Rubilar ◽  
Gonzalo R. Tortella ◽  
Raphael Cuevas ◽  
Mara Cea ◽  
Susana Rodríguez-Couto ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Column ◽  
Column Reactor ◽  
Adsorptive Removal

Zeolite and potting soil sorption of CO2 and NH3 evolved during co-composting of grape and tobacco waste

2013 ◽  
Vol 67 (9) ◽  
Author(s):  
Dajana Kučić ◽  
Nina Kopčić ◽  
Felicita Briški
Keyword(s):  
Fixed Bed ◽  
Dry Mass ◽  
Air Pollutant ◽  
Fixed Bed Column ◽  
Column Reactor ◽  
Exhaust Gases ◽  
Grape Waste ◽  
Forced Aeration ◽  
Carbon Dioxide Co2 ◽  
Tobacco Waste

AbstractThe gaseous byproducts produced during the composting of different kinds of solid waste are carbon dioxide (CO2) and ammonia (NH3). CO2 is a greenhouse gas and NH3 is a toxic and corrosive air pollutant so, they must be removed from exhaust gases prior to release into the atmosphere. The purpose of this work was to investigate the sorption of CO2 and NH3, evolved during composting, on zeolite and potting soil. The composting of the mixture of grape waste (GW) and tobacco waste (TW) in the mass ratio GW: TW = 55: 45 (dry mass basis) was carried out under forced aeration (0.645 L min−1 kg−1) in a column reactor (10 L) under adiabatic conditions over 21 days. Adsorption of the gases evolved was carried out in the fixed-bed column reactor (0.166 L). The most important physical-chemical characteristics of the composting mass and adsorbents and the evolved CO2 and NH3 were closely monitored. The highest CO2 and NH3 concentrations were measured at the thermophilic stage and the cooling stage of composting, respectively. The results showed that zeolite and potting soil were good adsorbents for the sorption of CO2 and NH3. The zeolite adsorbed 31 % of the evolved CO2 and the entire concentration of ammonia, whilst the potting soil adsorbed 3 % of CO2 and 49 % of NH3 from the exhaust gases.

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

Sign in / Sign up

Export Citation Format

Share Document