scholarly journals Fermentative Hydrogen Production by Molasses; Effect of Hydraulic Retention Time, Organic Loading Rate and Microbial Dynamics

10.5772/47750 ◽  
2012 ◽  
Author(s):  
Iosif Mariakakis ◽  
Carsten Meyer ◽  
Heidrun Steinmetz
Keyword(s):  
Hydrogen Production ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Microbial Dynamics ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

Continuous Fermentative Hydrogen Production from Brown Sugar Using EGSB Reactor

2010 ◽  
Vol 113-116 ◽  
pp. 1132-1137 ◽  
Author(s):  
Yong Feng Li ◽  
Yong Ming Hui ◽  
Xin Yao ◽  
Lu Wang ◽  
Qian Wen Song ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Granular Sludge ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Hydrogen Production Rate ◽  
Brown Sugar ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

In this experiment, brown sugar was chosen as the substrate of continuous operation. A lab-scale expanded granular sludge blanket (EGSB) reactor was employed. Stable ethanol-type fermentation was formed by controlling the organic loading rate (OLR). The results showed a maximum hydrogen production rate of 5.73L / L reactor•d was achieved, under the condition that the hydraulic retention time (HRT) = 2h, OLR = 97.2kg COD/m3 reactor•d. The average hydrogen content in the biogas during the 73-day operation was 41.27%.

Properties of Anaerobic Activated Sludge in Biohydrogen Production Reactor

2014 ◽  
Vol 884-885 ◽  
pp. 503-506
Author(s):  
Zhi Qin ◽  
Guang Yu Bai ◽  
Qi Zhang ◽  
Yong Yan Cui ◽  
Chao Yu Zhang
Keyword(s):  
Hydrogen Production ◽  
Activated Sludge ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Biohydrogen Production ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Mixture Volume ◽  
Total Mixture

For the properties of activated sludge studies, three kinds of activated sludge were obtained from continuous hydrogen production reactor. Activated sludge was got under organic loading rate (OLR) of 3, 7 and 25 kgCOD/m3·d condition, respectively. Sedimentation performance and activities of sludge were investigated. When OLR was 3 kgCOD/m3·d, activated sludge showed good sedimentation performance. After 30 minutes sedimentation, the volume of activated sludge in total mixture volume was about 39%. When OLR was 7 and 25kgCOD/m3·d, after 30 minutes sedimentation, the volume of activated sludge in total mixture volume was 80% and 83%, respectively. The increase of biomass is the main reason for increase of sedimentation performance. MLVSS/MLSS of activated sludge was 37.7% and 79.6% under OLR of 3 and 25kgCOD/m3·d condition, therefore, activities of activated sludge was high under high OLR condition. Since sedimentation performance of sludge is high under high OLR condition, hydraulic retention time should controlled carefully in engineering operation.

Photo-fermentative hydrogen production in a 4 m 3 baffled reactor: Effects of hydraulic retention time

2017 ◽  
Vol 239 ◽  
pp. 533-537 ◽  
Author(s):  
Quanguo Zhang ◽  
Chaoyang Lu ◽  
Duu-Jong Lee ◽  
Yu-Jen Lee ◽  
Zhiping Zhang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

Working Parameters Optimization of Hydrolysis-acidogenesis reactor in two stage anaerobic digestion of slaughterhouse Wastewater for Biogas Production

2020 ◽  
Author(s):  
Dejene Tsegaye Bedane ◽  
Mohammed Mazharuddin Khan ◽  
Seyoum Leta Asfaw
Keyword(s):  
Anaerobic Digestion ◽  
Working Conditions ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Slaughterhouse Wastewater ◽  
Working Parameters

Abstract Background : Wastewater from agro-industries such as slaughterhouse is typical organic wastewater with high value of biochemical oxygen demand, chemical oxygen demand, biological organic nutrients (Nitrogen and phosphate) which are insoluble, slowly biodegradable solids, pathogenic and non-pathogenic bacteria and viruses, parasite eggs. Moreover it contains high protein and putrefies fast leading to environmental pollution problem. This indicates that slaughterhouses are among the most environmental polluting agro-industries. Anaerobic digestion is a sequence of metabolic steps involving consortiums of several microbial populations to form a complex metabolic interaction network resulting in the conversation of organic matter into methane (CH 4 ), carbon dioxide (CO 2 ) and other trace compounds. Separation of the phase permits the optimization of the organic loading rate and HRT based on the requirements of the microbial consortiums of each phase. The purpose of this study was to optimize the working conditions for the hydrolytic - acidogenic stage in two step/phase anaerobic digestion of slaughterhouse wastewater. The setup of the laboratory scale reactor was established at Center for Environmental Science, College of Natural Science with a total volume of 40 liter (36 liter working volume and 4 liter gas space). The working parameters for hydrolytic - acidogenic stage were optimized for six hydraulic retention time 1-6 days and equivalent organic loading rate of 5366.43 – 894.41 mg COD/L day to evaluate the effect of the working parameters on the performance of hydrolytic – acidogenic reactor. Result : The finding revealed that hydraulic retention time of 3 day with organic loading rate of 1,788.81 mg COD/L day was a as an optimal working conditions for the parameters under study for the hydrolytic - acidogenic stage. The degree of hydrolysis and acidification were mainly influenced by lower hydraulic retention time (higher organic loading rate) and highest values recorded were 63.92 % at hydraulic retention time of 3 day and 53.26% at hydraulic retention time of 2 day respectively. Conclusion : The finding of the present study indicated that at steady state the concentration of soluble chemical oxygen demand and total volatile fatty acids increase as hydraulic retention time decreased or organic loading rate increased from 1 day hydraulic retention time to 3 day hydraulic retention time and decreases as hydraulic retention time increase from 4 to 6 day. The lowest concentration of NH 4 + -N and highest degree of acidification was also achieved at hydraulic retention time of 3 day. Therefore, it can be concluded that hydraulic retention time of 3 day/organic loading rate of 1,788.81 mg COD/L .day was selected as an optimal working condition for the high performance and stability during the two stage anaerobic digestion of slaughterhouse wastewater for the hydrolytic-acidogenic stage under mesophilic temperature range selected (37.5℃). Keywords : Slaughterhouse Wastewater, Hydrolytic – Acidogenic, Two Phase Anaerobic Digestion, Optimal Condition, Agro-processing wastewater

Effect of COD/SO42−ratio and Fe(II) under the variable hydraulic retention time (HRT) on fermentative hydrogen production

2009 ◽  
Vol 43 (14) ◽  
pp. 3525-3533 ◽  
Author(s):  
Jae-Hoon Hwang ◽  
Gi-Cheol Cha ◽  
Tae-Young Jeong ◽  
Dong-Jin Kim ◽  
Amit Bhatnagar ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen
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