Carboxylic acids production via anaerobic fermentation: Microbial communities’ responses to stepwise and direct hydraulic retention time decrease

2021 ◽  
pp. 126282
Author(s):  
Mercedes Llamas ◽  
Silvia Greses ◽  
Elia Tomás-Pejó ◽  
Cristina González-Fernández
Keyword(s):  
Microbial Communities ◽  
Carboxylic Acids ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Anaerobic Fermentation ◽  
Time Decrease

scholarly journals The Effect of pH And Hydraulic Retention Time On Production Of Volatile Fatty Acids From Primary Sludge Anaerobic Fermentation

2021 ◽  
Author(s):  
Umme Sharmeen Hyder
Keyword(s):  
Fatty Acids ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Hydraulic Retention Time ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Nitrogen And Phosphorus ◽  
Primary Sludge ◽  
Effect Of Ph ◽  
Ph Range

Primary Sludge (PS) from wastewater treatment plants contains high biodegradable organic matter and therefore can be used to produce Volatile Fatty Acids (VFAs). The produced VFAs can be utilized in biological nitrogen and phosphorus removal processes as an external carbon source. The objective of this research was to investigate the effect of pH and hydraulic retention time (HRT) on the production of VFAs from PS through the anaerobic fermentation process. The experiments were conducted in both batch and semi-continuous flow regimes using bench scale fermenters under the mesophilic temperature. The Design of experiments included the HRT of 1 – 3 days and pH range of 4.5 - 11.0 for batch and 4.5 - 6.5 for semi-continuous modes. According to the obtained results, the VFAs production increased with an increase in HRT from 1 to 3 days. For the batch study, the pH range for maximum VFAs yield was pH 6.5 –10.0 achieved at HRT of 3 days. For the semi-continuous study, the maximum amount of VFAs production was observed at a pH of 6.5 and HRT of 3 days.

scholarly journals The Effect of pH And Hydraulic Retention Time On Production Of Volatile Fatty Acids From Primary Sludge Anaerobic Fermentation

2021 ◽  
Author(s):  
Umme Sharmeen Hyder
Keyword(s):  
Fatty Acids ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Hydraulic Retention Time ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Nitrogen And Phosphorus ◽  
Primary Sludge ◽  
Effect Of Ph ◽  
Ph Range

Primary Sludge (PS) from wastewater treatment plants contains high biodegradable organic matter and therefore can be used to produce Volatile Fatty Acids (VFAs). The produced VFAs can be utilized in biological nitrogen and phosphorus removal processes as an external carbon source. The objective of this research was to investigate the effect of pH and hydraulic retention time (HRT) on the production of VFAs from PS through the anaerobic fermentation process. The experiments were conducted in both batch and semi-continuous flow regimes using bench scale fermenters under the mesophilic temperature. The Design of experiments included the HRT of 1 – 3 days and pH range of 4.5 - 11.0 for batch and 4.5 - 6.5 for semi-continuous modes. According to the obtained results, the VFAs production increased with an increase in HRT from 1 to 3 days. For the batch study, the pH range for maximum VFAs yield was pH 6.5 –10.0 achieved at HRT of 3 days. For the semi-continuous study, the maximum amount of VFAs production was observed at a pH of 6.5 and HRT of 3 days.

scholarly journals Optimization of anaerobic fermentation of kitchen waste

2013 ◽  
Vol 59 (No. 1) ◽  
pp. 1-8 ◽  
Author(s):  
T. Dlabaja ◽  
J. Malaťák
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Anaerobic Fermentation ◽  
Ammonia Concentration ◽  
Continuous Reactor ◽  
Organic Loading Rate ◽  
Batch Reactors ◽  
Organic Loading ◽  
Pre Treatment

Anaerobic fermentation is a suitable method of energetic and material utilisation of waste coming from restaurants and canteens. Laboratory experiments of wet anaerobic fermentation were performed in a continuous reactor and in batch reactors under mesophilic conditions. Effects of hydraulic retention time, organic loading rate, period of feeding and recirculation of digestate were examined in the continuous reactor. Effects of substrate pre-treatment (crushing, heating, freezing) were examined in the batch reactors. Degree of substrate degradation ranged between 83–85% within hydraulic retention time of 2–30 days. Appropriate organic loading rate was found in the range 2–3 kg of volatile solids per m3/day. Recirculation of digestate (both an inoculum for fresh substrate and replacement of fresh water supply) caused an increase in ammonia concentration and led to immediate inhibition of the process. The results further showed a positive effect of substrate pre-treatment in the initial phase of fermentation. However, degree of degradation did not show a significant increase for the period of 20 days of fermentation.    

scholarly journals Use of G-phase for biogas production

2012 ◽  
Vol 60 (6) ◽  
pp. 89-96 ◽  
Author(s):  
Martina Haitl ◽  
Tomáš Vítěz ◽  
Tomáš Koutný ◽  
Radovan Kukla ◽  
Tomáš Lošák ◽  
...  
Keyword(s):  
Retention Time ◽  
Methane Production ◽  
Waste Treatment ◽  
Hydraulic Retention Time ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Swine Manure ◽  
Energy Resource ◽  
Biodiesel Production ◽  
Organic Waste Treatment

Biogas is very promising renewable energy resource. The number of biogas plants increase every year. Currently there is a demand for new ways of organic waste treatment from production of different commodities. One of the technologies which produce waste is biodiesel production. One of the wastes from the biodiesel production is G-phase which is mainly consisted from glycerol and methanol. The aim of work was to find the effect of G-phase addition, to fermented material, on biogas resp. methane production. Two lab-scale batch anaerobic fermentation tests (hydraulic retention time 14 and 22 days) under mesophilic temperature conditions 38.5 °C have been performed. The positive effect of G-phase addition to methane production has been found. G-phase was added in three different amounts of inoculums volume 0.5 %, 1% and 1.5 %. The highest absolute methane production has been achieved by 1.5 % addition of G-phase. However it was also found difference in specific methane production due to use of different inoculum consisted of swine or cow manure. The specific methane production in hydraulic retention time of 14 days has been for the same G-phase dose 1.5 % higher for swine manure, 0.547 m3∙kg−1 of organics solids compare with cow liquid manure 0.474 m3∙kg−1 of organics solids.

Research of Anaerobic Fermentation Hydrogen Production Process by Continuous Flow from Contained Sugar Wastewater

2013 ◽  
Vol 779-780 ◽  
pp. 1298-1303
Author(s):  
Yang Li ◽  
Bing Huang ◽  
Yuan Yin ◽  
Ya Meng Yan ◽  
Ji Chao Xu
Keyword(s):  
Hydrogen Production ◽  
Retention Time ◽  
Continuous Flow ◽  
High Speed ◽  
Hydraulic Retention Time ◽  
Anaerobic Fermentation ◽  
Laboratory Research ◽  
Continuous Stirred Tank Reactor ◽  
Fermentation Time ◽  
Continuous Stirred Tank

The basal fermentation time and hydraulic retention time were systemically investigated about anaerobic fermentation production hydrogen process by continuous flow which is based on activated sludge for a basic strain and simulating sucrose wastewater for a substrate in a continuous stirred tank reactor. The highest hydrogen production rate was got at the fermentation time of 15h for and 6h for hydraulic retention time. The optimum run acidity (pH = 4.5 5.0) was kept through their own system circulation to hold the system state of high-speed and continuous hydrogen production. The results can really laid the groundwork for the anaerobic fermentation production hydrogen process by continuous flow from contained sugar wastewater from the laboratory research towards industrialization.

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