scholarly journals Effect of heat treatment on hydrogen production by combined fermentation of wild carp and excess sludge

2019 ◽  
Vol 356 ◽  
pp. 012004
Author(s):  
H D Zhu ◽  
H Y Fu ◽  
M Xu ◽  
G X Su ◽  
Y C Wu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Hydrogen Production ◽  
Excess Sludge ◽  
Wild Carp

scholarly journals Fabrication of a Microtubular La0.6Sr0.4Ti0.2Fe0.8O3−δMembrane by Electrophoretic Deposition for Hydrogen Production

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Kyoung-Jin Lee ◽  
Yeong-Ju Choe ◽  
Jun-Sung Lee ◽  
Hae-Jin Hwang
Keyword(s):  
Heat Treatment ◽  
Hydrogen Production ◽  
Production Rate ◽  
Water Splitting ◽  
Electrophoretic Deposition ◽  
Oxygen Permeation ◽  
Hydrogen Production Rate ◽  
Tubular Membrane ◽  
Production Behavior

Microtubular type La0.6Sr0.4Ti0.2Fe0.8O3−δ(LSTF) membranes were prepared by electrophoretic deposition (EPD). The oxygen permeation and hydrogen production behavior of the membranes were investigated under various conditions. LSTF green layer was successfully coated onto a carbon rod and, after heat treatment at 1400°C in air, a dense LSTF tubular membrane with a thickness of 250 mm can be obtained. The oxygen permeation and hydrogen production rate were enhanced by CH4in the permeate side, and the hydrogen production rate by water splitting was 0.22 mL/min·cm2at 1000°C. It is believed that hydrogen production via water splitting using these tubular LSTF membranes is possible.

Enhancement of anaerobic biohydrogen/methane production from cellulose using heat-treated activated sludge

2011 ◽  
Vol 63 (9) ◽  
pp. 1849-1854 ◽  
Author(s):  
C. H. Lay ◽  
F. Y. Chang ◽  
C. Y. Chu ◽  
C. C. Chen ◽  
Y. C. Chi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Hydrogen Production ◽  
Activated Sludge ◽  
Production Rate ◽  
Methane Production ◽  
Treatment Temperature ◽  
Fermentative Hydrogen Production ◽  
Heat Treated ◽  
Initial Ph ◽  
Thermally Treated

Anaerobic digestion is an effective technology to convert cellulosic wastes to methane and hydrogen. Heat-treatment is a well known method to inhibit hydrogen-consuming bacteria in using anaerobic mixed cultures for seeding. This study aims to investigate the effects of heat-treatment temperature and time on activated sludge for fermentative hydrogen production from α-cellulose by response surface methodology. Hydrogen and methane production was evaluated based on the production rate and yield (the ability of converting cellulose into hydrogen and methane) with heat-treated sludge as the seed at various temperatures (60–97°C) and times (20–60 min). Batch experiments were conducted at 55°C and initial pH of 8.0. The results indicate that hydrogen and methane production yields peaked at 4.3 mmol H2/g cellulose and 11.6 mmol CH4/g cellulose using the seed activated sludge that was thermally treated at 60°C for 40 min. These parameter values are higher than those of no-treatment seed (HY 3.6 mmol H2/g cellulose and MY 10.4 mmol CH4/g cellulose). The maximum hydrogen production rate of 26.0 mmol H2/L/d and methane production rate of 23.2 mmol CH4/L/d were obtained for the seed activated sludge that was thermally treated at 70°C for 50 min and 60°C for 40 min, respectively.

Excess sludge reduction in activated sludge processes by integrating biomass alkaline heat treatment

2001 ◽  
Vol 44 (2-3) ◽  
pp. 437-444 ◽  
Author(s):  
M. Rocher ◽  
G. Roux ◽  
G. Goma ◽  
A. Pilas Begue ◽  
L. Louvel ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Waste Treatment ◽  
Ralstonia Eutropha ◽  
Synthetic Wastewater ◽  
Waste Activated Sludge ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Activated Sludge Processes

With new EC regulations, alternative treatment and disposal techniques of the excess sludge produced by activated sludge wastewater treatment plants have to be developed. To decrease activated sludge production yield, microbial cell lysis can be amplified to enhance cryptic growth (biomass growth on lysates). Cell breakage techniques (thermal, alkaline and a combination) were studied to generate Ralstonia eutropha (strain model) and waste activated sludge lysates and to evaluate their biodegradability. Gentle treatment conditions by alkaline waste treatment (20 min at 60°C and pH 10 by NaOH addition) allowed waste activated sludge to be solubilized by a two step process (instantaneous and post-treatment) giving a dissolved organic carbon released by the total suspended solids treated of 267 mgDOC.g-1TSS. The biodegradation of the soluble fraction of the lysates by fresh sludge reached 75 and 90% after 48 and 350 hrs of incubation respectively. A validation on a laboratory scale by insertion of a liquor alkaline heat treatment loop in a biological synthetic wastewater treatment process was carried out. A reduction of 37% of the excess sludge was obtained without altering the purification yield of the process.

NiO-decorated graphitic carbon nitride toward electrocatalytic hydrogen production from ethanol

2020 ◽  
Vol 49 (34) ◽  
pp. 12088-12097
Author(s):  
M. I. Chebanenko ◽  
A. A. Lobinsky ◽  
V. N. Nevedomskiy ◽  
V. I. Popkov
Keyword(s):  
Heat Treatment ◽  
Hydrogen Production ◽  
Carbon Nitride ◽  
Colloidal Solution ◽  
Graphitic Carbon ◽  
Nickel Acetate ◽  
Graphitic Carbon Nitride

In this study, exfoliated g-C3N4/NiO nanocomposites were synthesized by the heat treatment of urea and subsequent ultrasonic exfoliation of the colloidal solution with the introduction of nickel acetate.

Organic matter release in low temperature thermal treatment of biological sludge for reduction of excess sludge production

2006 ◽  
Vol 54 (5) ◽  
pp. 59-68 ◽  
Author(s):  
E. Paul ◽  
P. Camacho ◽  
D. Lefebvre ◽  
P. Ginestet
Keyword(s):  
Heat Treatment ◽  
Organic Matter ◽  
Thermal Treatment ◽  
Activated Sludge ◽  
Order Kinetic ◽  
Excess Sludge ◽  
Digested Sludge ◽  
Significant Difference ◽  
The Impact ◽  
Sludge Production

Thermal treatment applied in association with a biological system allows for a significant reduction in excess sludge production (∼50%). In general, heat treatment is described as a sludge disintegration technique. This paper offers a thorough study on the impact of heat treatment, at temperatures below 100 °C, on the solubilisation of the sludge COD and its biodegradability. Discontinuous heating experiments were performed on activated and digested sludge. At all temperatures tested the released COD for digested sludge was systematically higher than that for activated sludge (15 and 40%, respectively, at 95 °C for 40 min of contact time). For the first 30 min, a 1st order kinetic, with respect to the residual COD, was systematically found. In the range of 40–95 °C, digested sludge had a lower activation energy than activated sludge (26 kcal/mol compared to 70–160 kcal/mol). COD solubilisation is thus more positively influenced by temperature in the case of activated sludge. This may be due to the significant difference in the ratio of protein/carbohydrate in digested and activated sludge (1–5 and 0.2–0.7, respectively). The increase in the COD/TKN ratio in the solubilised fraction after thermal treatment of activated sludge suggests a preferential solubilisation of proteins over carbohydrates. Respirometric tests performed on the solubilised COD showed that whatever the sludge origin, only 40–50% of released COD is biodegradable at a conventional hydraulic retention time (i.e. 24 h). Hence, heat treatment would act more through organic matter solubilisation rather than by a biodegradability increase.

scholarly journals Effect of Pre-Treatment Palm Oil Mill Effluent POME on Biohydrogen Production by Local Isolate Clostridium Butyricum

2011 ◽  
Vol 236-238 ◽  
pp. 2987-2992 ◽  
Author(s):  
Syafawati Ahmad Kamal ◽  
Mariatul Fadzillah Mansor ◽  
Jamaliah Mohd Jahim ◽  
Nurina Anuar
Keyword(s):  
Heat Treatment ◽  
Carbon Source ◽  
Hydrogen Production ◽  
Palm Oil ◽  
Reducing Sugar ◽  
Palm Oil Mill Effluent ◽  
Total Carbohydrate ◽  
Initial Ph ◽  
Palm Oil Mill ◽  
Pre Treatment

Palm oil mill effluent (POME) contains approximately 6% fiber. The effectiveness of pre-treatment on POME can serve a very good feedstock for hydrogen production in fermentation process. In this research, the effectiveness of pre-treatment methods on POME treated using acid and base were analysed based total carbohydrate and reducing sugar content. By using 1M NaOH with heat treatment, 26.12% carbon source converted to reducing sugar while by using 1M H2SO4 with heat treatment, over 32.09% carbon source converted to reducing sugar. The highest increment of total carbohydrate where from acid-heat treatment with 26.1% increment from initial concentration. At the initial pH (5.5) with fermentation temperature 37°C, the highest hydrogen production rate given by acid-heat treatment was 0.5mL H2/mL POME. Different for initial pH 7.0 with the same temperature, the highest hydrogen produced rate was given by base-heat treatment with 0.59 mL H2/mL POME. The production of hydrogen in 2L bioreactor given much higher hydrogen production compare to production in serum bottle. This fermentation was run in batch mode with initial pH 7 and control at 5.5. The maximum hydrogen produce was 4304 mL H2/ L POME from acid-heat treatment.

Effects of heat treatment on microbial communities of granular sludge for biological hydrogen production

2012 ◽  
Vol 66 (7) ◽  
pp. 1483-1490 ◽  
Author(s):  
Luca Alibardi ◽  
Lorenzo Favaro ◽  
Maria Cristina Lavagnolo ◽  
Marina Basaglia ◽  
Sergio Casella
Keyword(s):  
Heat Treatment ◽  
Hydrogen Production ◽  
Microbial Communities ◽  
Granular Sludge ◽  
Dark Fermentation ◽  
Anaerobic Granular Sludge ◽  
Batch Test ◽  
Ph Values ◽  
Pre Treatment ◽  
Selection Of

Dark fermentation shares many features with anaerobic digestion with the exception that to maximize hydrogen production, methanogens and hydrogen-consuming bacteria should be inhibited. Heat treatment is widely applied as an inoculum pre-treatment due to its effectiveness in inhibiting methanogenic microflora but it may not exclusively select for hydrogen-producing bacteria. This work evaluated the effects of heat treatment on microbial viability and structure of anaerobic granular sludge. Heat treatment was carried out on granular sludge at 100 °C with four residence times (0.5, 1, 2 and 4 h). Hydrogen production of treated sludges was studied from glucose by means of batch test at different pH values. Results indicated that each heat treatment strongly influenced the granular sludge resulting in microbial communities having different hydrogen productions. The highest hydrogen yields (2.14 moles of hydrogen per mole of glucose) were obtained at pH 5.5 using the sludge treated for 4 h characterized by the lowest CFU concentration (2.3 × 103CFU/g sludge). This study demonstrated that heat treatment should be carefully defined according to the structure of the sludge microbial community, allowing the selection of highly efficient hydrogen-producing microbes.

Sign in / Sign up

Export Citation Format

Share Document