scholarly journals In Situ Acoustic Treatment of Anaerobic Digesters to Improve Biogas Yields

Environments ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 11 ◽  
Author(s):  
John Loughrin ◽  
Stacy Antle ◽  
Karamat Sistani ◽  
Nanh Lovanh
Keyword(s):  
Microbial Growth ◽  
Vibrational Energy ◽  
Biogas Production ◽  
Acoustic Cavitation ◽  
Pilot Scale ◽  
Broadband Noise ◽  
Anaerobic Digesters ◽  
Acoustic Treatment

Sound has the potential to increase biogas yields and enhance wastewater degradation in anaerobic digesters. To assess this potential, two pilot-scale digestion systems were operated, with one exposed to sound at less than 10 kHz and with one acting as a control. Sounds used were sine waves, broadband noise, and orchestral compositions. Weekly biogas production from sound-treated digesters was 18,900 L, more than twice that of the control digester. The sound-treated digesters were primarily exposed to orchestral compositions, because this made cavitational events easier to identify and because harmonic and amplitude shifts in music seem to induce more cavitation. Background recordings from the sound-treated digester were louder and had more cavitational events than those of the control digester, which we ascribe to enhanced microbial growth and the resulting accelerated sludge breakdown. Acoustic cavitation, vibrational energy imparted to wastewater and sludge, and mixing due to a release of bubbles from the sludge may all act in concert to accelerate wastewater degradation and boost biogas production.

Treatment of slaughterhouse blood waste using pilot scale two-stage anaerobic digesters for biogas production

2018 ◽  
Vol 126 ◽  
pp. 552-562 ◽  
Author(s):  
Shunli Wang ◽  
Gary L. Hawkins ◽  
Brian H. Kiepper ◽  
Keshav C. Das
Keyword(s):  
Biogas Production ◽  
Pilot Scale ◽  
Two Stage ◽  
Anaerobic Digesters

Ultrasound-assisted digestate treatment of manure digestate for increased biogas production in small pilot scale anaerobic digesters

2020 ◽  
Vol 152 ◽  
pp. 664-673 ◽  
Author(s):  
Samet Azman ◽  
Hannah Milh ◽  
Matthijs H. Somers ◽  
Huili Zhang ◽  
Ine Huybrechts ◽  
...  
Keyword(s):  
Biogas Production ◽  
Pilot Scale ◽  
Anaerobic Digesters ◽  
Ultrasound Assisted

scholarly journals Potential pitfalls of FISH microscopy as assessment method for anaerobic digesters

2016 ◽  
Author(s):  
Christian Abendroth ◽  
Sarah Hahnke ◽  
Michael Klocke ◽  
Olaf Luschnig
Keyword(s):  
Microbial Activity ◽  
Biogas Production ◽  
Assessment Method ◽  
Gas Production ◽  
Anaerobic Digester ◽  
Fish Analysis ◽  
Metabolic State ◽  
Anaerobic Digesters ◽  
Biogas Reactor

AbstractIn the present work we investigated how the state of a biogas reactor impacts the enumeration of prokaryotic cells by fluorescencein situhybridisation (FISH). Therefore, the correlation between gas production and FISH hybridisation rates was analysed in different anaerobic digester sludges. High gasification activity coincided with high hybridisation rates. Low hybridisation rates were especially achieved with reactor samples subjected to long starvation periods showing low biogas production.Based on our findings we conclude that samples for FISH analysis should be fixed as soon as possible to prevent a loss of microbial activity resulting in lower FISH signals. Furthermore, the location of sampling is of importance, since samples from different fermenters within the same biogas plant also varied strongly in their FISH hybridisation rate. Our results indicate that FISH could be a useful method for assessing the metabolic state of microorganisms in anaerobic digester plants.

On-site and in situ bioremediation of wood-preservative contaminated groundwater

2000 ◽  
Vol 42 (5-6) ◽  
pp. 371-376 ◽  
Author(s):  
J.A. Puhakka ◽  
K.T. Järvinen ◽  
J.H. Langwaldt ◽  
E.S. Melin ◽  
M.K. Männistö ◽  
...  
Keyword(s):  
Iron Oxidation ◽  
Wood Preservative ◽  
Pilot Scale ◽  
High Rate ◽  
Contaminated Groundwater ◽  
Groundwater Temperature ◽  
In Situ Bioremediation ◽  
Contaminated Aquifer ◽  
Fluidized Bed Process

This paper reviews ten years of research on on-site and in situ bioremediation of chlorophenol contaminated groundwater. Laboratory experiments on the development of a high-rate, fluidized-bed process resulted in a full-scale, pump-and-treat application which has operated for several years. The system operates at ambient groundwater temperature of 7 to 9°C at 2.7 d hydraulic retention time and chlorophenol removal efficiencies of 98.5 to 99.9%. The microbial ecology studies of the contaminated aquifer revealed a diverse chlorophenol-degrading community. In situ biodegradation of chlorophenols is controlled by oxygen availability, only. Laboratory and pilot-scale experiments showed the potential for in situ aquifer bioremediation with iron oxidation and precipitation as a potential problem.

Programmed Iron Oxide Nanoparticles Disintegration in Anaerobic Digesters Boosts Biogas Production

Small ◽  
2014 ◽  
Vol 10 (14) ◽  
pp. 2801-2808 ◽  
Author(s):  
Eudald Casals ◽  
Raquel Barrena ◽  
Ana García ◽  
Edgar González ◽  
Lucía Delgado ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Biogas Production ◽  
Oxide Nanoparticles ◽  
Anaerobic Digesters

scholarly journals ENVIRONMENTAL POLLUTION BY WASTEWATER FROM BROWN COAL PROCESSING ¬ A REMEDIATION CASE STUDY IN GERMANY

2014 ◽  
Vol 22 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Arndt Wiessner ◽  
Jochen A. Müller ◽  
Peter Kuschk ◽  
Uwe Kappelmeyer ◽  
Matthias Kästner ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Large Scale ◽  
Pilot Scale ◽  
Wastewater Disposal ◽  
Interdisciplinary Approaches ◽  
Phenolic Wastewater ◽  
Term Monitoring

The large scale of the contamination by the former carbo-chemical industry in Germany requires new and often interdisciplinary approaches for performing an economically sustainable remediation. For example, a highly toxic and dark-colored phenolic wastewater from a lignite pyrolysis factory was filled into a former open-cast pit, forming a large wastewater disposal pond. This caused an extensive environmental pollution, calling for an ecologically and economically acceptable strategy for remediation. Laboratory-scale investigations and pilot-scale tests were carried out. The result was the development of a strategy for an implementation of full-scale enhanced in situ natural attenuation on the basis of separate habitats in a meromictic pond. Long-term monitoring of the chemical and biological dynamics of the pond demonstrates the metamorphosis of a former highly polluted industrial waste deposition into a nature-integrated ecosystem with reduced danger for the environment, and confirmed the strategy for the chosen remediation management.

scholarly journals Solid-state fermentation of soybean residues for bioflocculant production in a pilot-scale bioreactor system

2014 ◽  
Vol 70 (6) ◽  
pp. 1032-1039 ◽  
Author(s):  
Zufarzaana Zulkeflee ◽  
Antoni Sánchez
Keyword(s):  
Solid State ◽  
Solid State Fermentation ◽  
Microbial Growth ◽  
Future Prospect ◽  
Pilot Scale ◽  
Scale Level ◽  
Bioactive Materials ◽  
Current Dependence ◽  
Death Phase ◽  
Bioreactor System

An innovative approach using soybean residues for the production of bioflocculants through solid-state fermentation was carried out in 4.5 L near-to-adiabatic bioreactors at pilot-scale level. An added inoculum of the strain Bacillus subtilis UPMB13 was tested in comparison with control reactors without any inoculation after the thermophilic phase of the fermentation. The flocculating performances of the extracted bioflocculants were tested on kaolin suspensions, and crude bioflocculants were obtained from 20 g of fermented substrate through ethanol precipitation. The production of bioflocculants was observed to be higher during the death phase of microbial growth. The bioflocculants were observed to be granular in nature and consisted of hydroxyl, carboxyl and methoxyl groups that aid in their flocculating performance. The results show the vast potential of the idea of using wastes to produce bioactive materials that can replace the current dependence on chemicals, for future prospect in water treatment applications.

scholarly journals In situ visualisation of the abundant Chloroflexi populations in full-scale anaerobic digesters and the fate of immigrating species

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0206255 ◽  
Author(s):  
Francesca Petriglieri ◽  
Marta Nierychlo ◽  
Per Halkjær Nielsen ◽  
Simon Jon McIlroy
Keyword(s):  
Full Scale ◽  
Anaerobic Digesters

Anaerobic co-digestion of winery waste and waste activated sludge: assessment of process feasibility

2013 ◽  
Vol 69 (2) ◽  
pp. 269-277 ◽  
Author(s):  
C. Da Ros ◽  
C. Cavinato ◽  
F. Cecchi ◽  
D. Bolzonella
Keyword(s):  
Activated Sludge ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Waste Activated Sludge ◽  
Organic Loading ◽  
Operational Conditions ◽  
Loading Rates ◽  
Thermophilic Conditions ◽  
Soluble Chemical Oxygen Demand

In this study the anaerobic co-digestion of wine lees together with waste activated sludge in mesophilic and thermophilic conditions was tested at pilot scale. Three organic loading rates (OLRs 2.8, 3.3 and 4.5 kgCOD/m3d) and hydraulic retention times (HRTs 21, 19 and 16 days) were applied to the reactors, in order to evaluate the best operational conditions for the maximization of the biogas yields. The addition of lee to sludge determined a higher biogas production: the best yield obtained was 0.40 Nm3biogas/kgCODfed. Because of the high presence of soluble chemical oxygen demand (COD) and polyphenols in wine lees, the best results in terms of yields and process stability were obtained when applying the lowest of the three organic loading rates tested together with mesophilic conditions.

scholarly journals Growth and metal removal efficiency of the green algae Schroederia setigera and Selenastrum bibraianum exposed to nickel, zinc and cadmium

2020 ◽  
Vol 58 (5A) ◽  
pp. 22
Author(s):  
Dao Thanh Son ◽  
Van Tai Nguyen ◽  
Thuy Nhu Quynh Vo ◽  
Vinh Quang Tran ◽  
Thi My Chi Vo ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Green Algae ◽  
Removal Efficiency ◽  
Heavy Metal Contamination ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Pilot Scale ◽  
Nickel Zinc ◽  
Ecological Protection

Heavy metal contamination is among the globally environmental and ecological concerns. In this study we assessed the development of the two green algae Schroederia setigera and Selenastrum bibraianum under exposures to 5 – 200 µg/L of Ni, Zn, and Cd in the laboratory conditions. Heavy metal removal efficiency of S. setigera was also tested in 537 µg Ni/L, 734 µg Zn/L, and 858 µg Cd/L. We found that the exposures with these heavy metals caused inhibitory on the growth of S. bibraianum. The S. bibraianum cell size in the 200 µg Zn/L treatment was around two times smaller than the control. However, Zn and Cd at the concentration of 200 µg/L did not inhibit the growth of S. setigera over 18 days of exposure. The S. setigera also grew well during 8 days exposed to Ni at the same concentration. Besides, the alga S. setigera could remove 66% of Zn, 18% of Cd and 12% of Ni out of the test medium after 16 days of incubation. The Vietnam Technical Regulation related to metals should be considered for ecological protection. We recommend to test the metal removal by the alga S. setigera at pilot scale prior to apply it in situ

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