Inhibition of heavy metals on fermentative hydrogen production by granular sludge

Chemosphere ◽  
2007 ◽  
Vol 67 (4) ◽  
pp. 668-673 ◽  
Author(s):  
Chenlin Li ◽  
Herbert H.P. Fang
Keyword(s):  
Heavy Metals ◽  
Hydrogen Production ◽  
Granular Sludge ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

scholarly journals Fermentative hydrogen production in packed-bed and packing-free upflow reactors

2006 ◽  
Vol 54 (9) ◽  
pp. 95-103 ◽  
Author(s):  
C. Li ◽  
T. Zhang ◽  
H.H.P. Fang
Keyword(s):  
Hydrogen Production ◽  
Granular Sludge ◽  
Packed Bed ◽  
Synthetic Wastewater ◽  
Extracellular Polysaccharides ◽  
Hydrogen Yield ◽  
Bacterial Cells ◽  
Fermentative Hydrogen Production ◽  
Packing Rings ◽  
Fermentative Hydrogen

Fermentative hydrogen production from a synthetic wastewater containing 10 g/L of sucrose was studied in two upflow reactors at 26°C for 400 days. One reactor was filled with packing rings (RP) and the other was packing free (RF). The effect of hydraulic retention time (HRT) from 2 h to 24 h was investigated. Results showed that, under steady state, the hydrogen production rate significantly increased from 0.63 L/L/d to 5.35 L/L/d in the RF when HRT decreased from 24 h to 2 h; the corresponding rates were 0.56 L/L/d to 6.17 L/L/d for the RP. In the RF, the hydrogen yield increased from 0.96 mol/mol-sucrose at 24 h of HRT to the maximum of 1.10 mol/mol-sucrose at 8 h of HRT, and then decreased to 0.68 mol/mol-sucrose at 2 h. In the RP, the yield increased from 0.86 mol/mol-sucrose at 24 h of HRT to the maximum of 1.22 mol/mol-sucrose at 14 h of HRT, and then decreased to 0.78 mol/mol-sucrose at 2 h. Overall, the reactor with packing was more effective than the one free of packing. In both reactors, sludge agglutinated into granules. The microbial community of granular sludge in RP was investigated using 16S rDNA based techniques. The distribution of bacterial cells and extracellular polysaccharides in hydrogen-producing granules was investigated by fluorescence-based techniques. Results indicated that most of the N-acetyl-galactosamine/galactose-containing extracellular polysaccharides were distributed on the outer layer of the granules with a filamentous structure.

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%.

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