scholarly journals Role of ph, oxidation reduction potential and temperature change in biogas yield during anaerobic digestion of cattle manure

2017 ◽  
Vol 08 (03) ◽  
pp. 16137-16140 ◽  
Author(s):  
Saeed Samani ◽  
◽  
Mohammad Ali Abdoli ◽  
Abdolreza Karbassi ◽  
◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Temperature Change ◽  
Reduction Potential ◽  
Cattle Manure ◽  
Biogas Yield ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

Stimulation of the hydrolytic stage for biogas production from cattle manure in an electrochemical bioreactor

2016 ◽  
Vol 74 (3) ◽  
pp. 606-615 ◽  
Author(s):  
Saeed Samani ◽  
Mohammad Ali Abdoli ◽  
Abdolreza Karbassi ◽  
Mohammad Mehdi Amin
Keyword(s):  
Reduction Potential ◽  
Biogas Production ◽  
Electrical Power ◽  
Electrical Current ◽  
Cattle Manure ◽  
Biogas Yield ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Biogas Process ◽  
Electrical Source

Electrical current in the hydrolytic phase of the biogas process might affect biogas yield. In this study, four 1,150 mL single membrane-less chamber electrochemical bioreactors, containing two parallel titanium plates were connected to the electrical source with voltages of 0, −0.5, −1 and −1.5 V, respectively. Reactor 1 with 0 V was considered as a control reactor. The trend of biogas production was precisely checked against pH, oxidation reduction potential and electrical power at a temperature of 37 ± 0.5°C amid cattle manure as substrate for 120 days. Biogas production increased by voltage applied to Reactors 2 and 3 when compared with the control reactor. In addition, the electricity in Reactors 2 and 3 caused more biogas production than Reactor 4. Acetogenic phase occurred more quickly in Reactor 3 than in the other reactors. The obtained results from Reactor 4 were indicative of acidogenic domination and its continuous behavior under electrical stimulation. The results of the present investigation clearly revealed that phasic electrical current could enhance the efficiency of biogas production.

MP07-17 ROLE OF OXIDATION REDUCTION POTENTIAL IN VARICOCELE ASSOCIATED MALE INFERTILITY

2017 ◽  
Vol 197 (4S) ◽  
Author(s):  
Mohamed Arafa ◽  
Haitham ElBardisi ◽  
Ahmad Majzoub ◽  
Sami AlSaid ◽  
Abdel Rahman Jaber ◽  
...  
Keyword(s):  
Male Infertility ◽  
Reduction Potential ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

79. Studies in Cheddar Cheese. II. The Effect of Controlled Oxidation-reduction Potential on Ripening. III. The Rôle of Rennin, Pepsin and Lactobacilli

1934 ◽  
Vol 5 (2) ◽  
pp. 144-152 ◽  
Author(s):  
W. L. Davies ◽  
J. G. Davis ◽  
D. V. Dearden ◽  
A. T. R. Mattick
Keyword(s):  
Protein Degradation ◽  
Reduction Potential ◽  
Potassium Cyanide ◽  
Cheddar Cheese ◽  
Clotting Time ◽  
Ripening Process ◽  
Early Stages ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

II. When added as an oxidant to cheese, copper, to the extent of 36 p.p.m., produced an abnormal flavour and markedly inhibited the ripening process. The remaining oxidants (KNO3, KCIO3 and KCIO4) held the cheese at a higher potential and decreased the amount of proteolysis, especially after five months.Potassium cyanide had no effect on the proteolysis or the oxidation-reduction potential.It is concluded, therefore, that normally the flora of cheese holds the oxidation-reduction potential at such a point that proteolysis is diminished if the potential is raised to the oxidative side.III. Variations in the amounts of pepsin and rennin appeared to have little effect on flavour, texture, body or ripening. There was apparently no correlation between clotting time and extent of proteolysis. The addition of lactobacilli with the starter appeared to accelerate the protein degradation in the early stages of ripening.

scholarly journals Anaerobic Digestion of Starch Wastewater: the Effect of pH and Oxidation Reduction Potential on the Reactor Performance

2019 ◽  
Vol 3 (1) ◽  
pp. 21-23
Author(s):  
Zangta Sang ◽  
Chayanon Sawatdeenarunat ◽  
Pitchaya Suaisom
Keyword(s):  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Reduction Potential ◽  
Biogas Production ◽  
Organic Loading Rate ◽  
Continuous Stirred Tank Reactor ◽  
Reactor Performance ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Starch Wastewater

Anaerobic digestion (AD) of starch wastewater for biogas production has been widely installed in Thailand for a decade. Unfortunately, this specific waste stream contains low alkalinity (Alk) and high volatile fatty acids (VFAs) which could easily lead to system instability. The appropriate monitoring indicators could help to decrease chance of reactor failure. The aim of this study is to investigate the performance of the AD system and the effect of operating parameters i.e. oxidation-reduction potential (ORP) and pH on the system in a continuous stirred tank reactor operated in semi-continuous mode at organic loading rate (OLR) of 1.0 kg COD/m3.day.  The temperature was controlled at a mesophilic condition (35±2°C) for the whole experiment. The results showed that the average ORP and pH were -400 ±50 mV and 7.0 ± 0.2, respectively. The average biogas and methane yields were 0.901±0.128 NL/g VS added and 0.528±0.076 NL/g VS added, respectively.  The methane composition was 58.43±4.76 %. The total COD and filtrated COD removal efficiencies were   94.75±1.42% and 97.88±0.53%, respectively. It could be concluded that at the low OLR (i.e. 1.0 kg COD/m3.day), pH and ORP was stable and fell within the recommended range for AD and indicated the stability of the system.

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