Simultaneous pollutant removal and electricity generation in denitrifying microbial fuel cell with boric acid-borate buffer solution

2015 ◽  
Vol 71 (5) ◽  
pp. 783-788 ◽  
Author(s):  
Gang Chen ◽  
Shaohui Zhang ◽  
Meng Li ◽  
Yan Wei
Keyword(s):  
Fuel Cell ◽  
Boric Acid ◽  
Nitrogen Removal ◽  
Electricity Generation ◽  
Solution Concentration ◽  
Pollutant Removal ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
External Resistance ◽  
Buffer Solution

A double-chamber denitrifying microbial fuel cell (MFC), using boric acid-borate buffer solution as an alternative to phosphate buffer solution, was set up to investigate the influence of buffer solution concentration, temperature and external resistance on electricity generation and pollutant removal efficiency. The result revealed that the denitrifying MFC with boric acid-borate buffer solution was successfully started up in 51 days, with a stable cell voltage of 205.1 ± 1.96 mV at an external resistance of 50 Ω. Higher concentration of buffer solution favored nitrogen removal and electricity generation. The maximum power density of 8.27 W/m3 net cathodic chamber was obtained at a buffer solution concentration of 100 mmol/L. An increase in temperature benefitted electricity generation and nitrogen removal. A suitable temperature for this denitrifying MFC was suggested to be 25 °C. Decreasing the external resistance favored nitrogen removal and organic matter consumption by exoelectrogens.

(Invited) Micro- and Nano-Structure of Passive Film Formed on High Strengthen Steel Surface in pH 6.5 Boric Acid-Borate Buffer Solution

2020 ◽  
Vol MA2020-02 (12) ◽  
pp. 1263-1263
Author(s):  
Koji Fushimi ◽  
Kanta Higa ◽  
Yuichi Kitagawa ◽  
Yasuchika Hasegawa ◽  
Hideki Katayama
Keyword(s):  
Boric Acid ◽  
Passive Film ◽  
Steel Surface ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Nano Structure

Stability of the Mg65Y10Cu15Ag10 metallic glass in neutral and weakly acidic media

2003 ◽  
Vol 18 (1) ◽  
pp. 97-105 ◽  
Author(s):  
R. V. Subba Rao ◽  
U. Wolff ◽  
S. Baunack ◽  
J. Eckert ◽  
A. Gebert
Keyword(s):  
Metallic Glass ◽  
Boric Acid ◽  
Ph Value ◽  
Saturated Calomel Electrode ◽  
Corrosion Current ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Acidic Media ◽  
Buffer Solution ◽  
Chemical States

The corrosion behavior of the bulk glass-forming Mg65Y10Cu15Ag10 alloy was studied in neutral and weakly acidic media. Potentiodynamic polarization studies in cyclic and linear modes were carried out in electrolytes with a pH = 7, containing different anions. The alloy corroded freely in electrolytes with sulfate and pthalate ions, whereas passivity was observed in the electrolyte with borate ions. Further tests were performed in boric-acid-added borate buffer solution with pH = 7, 6, and 5. From Tafel characteristics, corrosion potentials and corrosion current densities were estimated. The data were compared with those of the ternary Mg65Y10Cu15 metallic glass. Potentiostatic anodic polarization tests were conducted on the Mg65Y10Cu15Ag10 alloy in boric-acid-added borate buffer solution with pH = 7 at two different potentials, 800 and 300 mV, saturated calomel electrode, which revealed different current transient characteristics. Auger electron spectroscopy was employed to characterize the anodically generated passive layers. The depth distributions of the elements as well as their chemical states were detected to be different for layers formed in electrolytes (i) with different pH values (8.4 and 7) of the same anion, (ii) with the same pH value but containing different anions (borate, sulfate, and pthalate), and (iii) with the same pH value and anion (borate) but at two different anodic potentials.

Performance of denitrifying microbial fuel cell subjected to variation in pH, COD concentration and external resistance

2013 ◽  
Vol 68 (1) ◽  
pp. 250-256 ◽  
Author(s):  
Jin-Tao Li ◽  
Shao-Hui Zhang ◽  
Yu-Mei Hua
Keyword(s):  
Fuel Cell ◽  
Chemical Oxygen Demand ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Acidic Ph ◽  
External Resistance ◽  
Weakly Alkaline ◽  
Effects Of Ph

The effects of pH, chemical oxygen demand (COD) concentration and external resistance on denitrifying microbial fuel cell were evaluated in terms of electricity generation characteristics and pollutant removal performance. The results showed that anodic influent with weakly alkaline or neutral pH and cathodic influent with weakly acidic pH favored pollutant removal and electricity generation. The suitable influent pH of the anode and cathode were found to be 7.5–8.0 and 6.0–6.5, respectively. In the presence of sufficient nitrate in the cathode, higher influent COD concentration led to more electricity generation and greater pollutant removal rates. With an anodic influent pH of 8.0 and a cathodic influent pH of 6.0, an influent COD concentration of 400 mg/L was deemed to be appropriate. Low external resistance favored nitrate and COD removal. The results suggest that operation of denitrifying microbial fuel cell at a lower external resistance would be desirable for pollutant removal but not electricity generation.

Passivity of Dual-Phase Carbon Steel with Ferrite and Martensite Phases in pH 8.4 Boric Acid-Borate Buffer Solution

2015 ◽  
Vol 162 (7) ◽  
pp. C322-C326 ◽  
Author(s):  
Kei Yanagisawa ◽  
Takayuki Nakanishi ◽  
Yasuchika Hasegawa ◽  
Koji Fushimi
Keyword(s):  
Carbon Steel ◽  
Boric Acid ◽  
Borate Buffer ◽  
Dual Phase ◽  
Borate Buffer Solution ◽  
Buffer Solution

Membrane filtration biocathode microbial fuel cell for nitrogen removal and electricity generation

2014 ◽  
Vol 60 ◽  
pp. 56-63 ◽  
Author(s):  
Guangyi Zhang ◽  
Hanmin Zhang ◽  
Yanjie Ma ◽  
Guangen Yuan ◽  
Fenglin Yang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Nitrogen Removal ◽  
Electricity Generation ◽  
Membrane Filtration

Current transients during repeated micro-indentation test of passive iron surface in pH 8.4 borate buffer solution

2007 ◽  
Vol 9 (7) ◽  
pp. 1672-1676 ◽  
Author(s):  
Takatoshi Yamamoto ◽  
Koji Fushimi ◽  
Masahiro Seo ◽  
Shiro Tsuri ◽  
Tetsuo Adachi ◽  
...  
Keyword(s):  
Indentation Test ◽  
Borate Buffer ◽  
Iron Surface ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Micro Indentation ◽  
Current Transients

Different Types of Microbial Fuel Cell (MFC) Systems for Simultaneous Electricity Generation and Pollutant Removal

2015 ◽  
Vol 74 (3) ◽  
Author(s):  
S. M. Zain ◽  
N. L. Ching ◽  
S. Jusoh ◽  
S. Y. Yunus
Keyword(s):  
Nitrogen Removal ◽  
Continuous Flow ◽  
Electricity Generation ◽  
Pollutant Removal ◽  
Flow Mode ◽  
Oxidizing Agent ◽  
Batch Mode ◽  
Carbon And Nitrogen ◽  
Different Types ◽  
The Relationship

The aim of this study is to identify the relationship between the rate of electricity generation and the rate of carbon and nitrogen removal from wastewater using different MFC processes.  Determining whether the generation of electricity using MFC process could be related to the rate of pollutant removal from wastewater is noteworthy. Three types of MFC process configurations include the batch mode (SS), a continuous flow of influent with ferricyanide (PF) as the oxidizing agent and a continuous flow of influent with oxygen (PU) as the oxidizing agent. The highest quantity of electricity generation was achieved using the continuous flow mode with ferricyanide (0.833 V), followed by the continuous flow mode with oxygen (0.589 V) and the batch mode (0.352 V). The highest efficiency of carbon removal is also achieved by the continuous flow mode with ferricyanide (87%), followed by the continuous flow mode with oxygen (51%) and the batch mode (46%). Moreover, the continuous flow mode with ferricyanide produced the highest efficiency for nitrogen removal (63%), followed by the continuous flow mode with oxygen (54%) and the batch mode (27%).

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