scholarly journals Enhancement of Biogas Production by Using a Two-Stage Process for the Anaerobic Digestion of Cheese Whey

2017 ◽  
pp. 130 ◽  
Author(s):  
Margarita A. Dareioti ◽  
Spyros N. Dokianakis ◽  
Constantina Zafiri ◽  
Michael Kornaros
Keyword(s):  
Anaerobic Digestion ◽  
Cheese Whey ◽  
Biogas Production ◽  
Organic Content ◽  
Single Stage ◽  
Total Carbon ◽  
Municipal Sewage ◽  
Two Stage ◽  
Specific Product ◽  
Stage Process

Cheese making companies have a specific product that is seasonally produced and, like most other agro-industries, generate wastewaters characterized by a high organic loading. Cheese whey is the most important waste stream produced having a high organic content (up to 70 g COD/L), which is highly biodegradable, and low alkalinity (50 meq/L). Cheese production industries worldwide generate more than 145 million tones of liquid whey per year. Because of these characteristics, cheese whey may cause serious environmental problems on the local municipal sewage treatment systems or water receptors if disposed untreated. Anaerobic digestion is a particularly attractive treatment solution for high strength wastewaters due to the operational economy and generation of biogas and therefore is considered as a promising solution for energy production from cheese whey, in this case. In this work, a comparative study between single and two-stage anaerobic treatment of cheese whey was conducted in order to enhance biogas production. Our experiments were carried out using one reactor for the single-stage process (operated at a HRT of 20 d), and two reactors connected in series, from which the first one was used for acidogenesis (operated at a HRT of 3 d) and the other for methanogenesis (operated at a HRT of 20 d). The single-stage process presented many operational problems, as a result of little or no buffering capacity of whey, which caused the pH of the anaerobic digester to drop drastically and the process being inhibited. This kind of inhibition proved to be irreversible and the digester was not able to recover even though it was operated batchwise and the value of the pH was restored to 7.0. On the contrary, the two-stage process exhibited a stable biogas production rate of 1.57 L/Lreactor/d with the composition of methane in the biogas reaching 54.3%. The dissolved COD and total carbon concentration removal was 70.5% and 77.2% respectively.

scholarly journals Assessment of Single- vs. Two-Stage Process for the Anaerobic Digestion of Liquid Cow Manure and Cheese Whey

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5423
Author(s):  
Margarita Andreas Dareioti ◽  
Aikaterini Ioannis Vavouraki ◽  
Konstantina Tsigkou ◽  
Michael Kornaros
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Methane Production ◽  
Cheese Whey ◽  
Biogas Production ◽  
Single Stage ◽  
Cow Manure ◽  
Two Stage ◽  
Methane Production Rate ◽  
Stage Process

The growing interest in processes that involve biomass conversion to renewable energy, such as anaerobic digestion, has stimulated research in this field in order to assess the optimum conditions for biogas production from abundant feedstocks, like agro-industrial wastes. Anaerobic digestion is an attractive process for the decomposition of organic wastes via a complex microbial consortium and subsequent conversion of metabolic intermediates to hydrogen and methane. The present study focused on the exploitation of liquid cow manure (LCM) and cheese whey (CW) as noneasily and easily biodegradable sources, respectively, using continuous stirred-tank reactors for biogas production, and a comparison was presented between single- and two-stage anaerobic digestion systems. No significant differences were found concerning LCM treatment, in a two-stage system compared to a single one, concluding that LCM can be treated by implementing a single-stage process, as a recalcitrant substrate, with the greatest methane production rate of 0.67 L CH4/(LR·d) at an HRT of 16 d. On the other hand, using the easily biodegradable CW as a monosubstrate, the two-stage process was considered a better treatment system compared to a single one. During the single-stage process, operational problems were observed due to the limited buffering capacity of CW. However, the two-stage anaerobic digestion of CW produced a stable methane production rate of 0.68 L CH4/(LR·d) or 13.7 L CH4/Lfeed, while the total COD was removed by 76%.

scholarly journals Comparative assessment of single-stage and two-stage anaerobic digestion for biogas production from high moisture municipal solid waste

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9693
Author(s):  
Wattananarong Markphan ◽  
Chonticha Mamimin ◽  
Wantanasak Suksong ◽  
Poonsuk Prasertsan ◽  
Sompong O-Thong
Keyword(s):  
Fly Ash ◽  
Anaerobic Digestion ◽  
Methane Production ◽  
Energy Recovery ◽  
Biogas Production ◽  
Single Stage ◽  
Organic Loading ◽  
High Moisture ◽  
Two Stage ◽  
Ph Adjustment

Background Anaerobic digestion (AD) is a suitable process for treating high moisture MSW with biogas and biofertilizer production. However, the low stability of AD performance and low methane production results from high moisture MSW due to the fast acidify of carbohydrate fermentation. The effects of organic loading and incineration fly ash addition as a pH adjustment on methane production from high moisture MSW in the single-stage AD and two-stage AD processes were investigated. Results Suitable initial organic loading of the single-stage AD process was 17 gVS L−1 at incineration fly ash (IFA) addition of 0.5% with methane yield of 287 mL CH4 g−1 VS. Suitable initial organic loading of the two-stage AD process was 43 gVS L−1 at IFA addition of 1% with hydrogen and methane yield of 47.4 ml H2 g−1 VS and 363 mL CH4 g−1 VS, respectively. The highest hydrogen and methane production of 8.7 m3 H2 ton−1 of high moisture MSW and 66.6 m3 CH4 ton−1 of high moisture MSW was achieved at organic loading of 43 gVS L−1 at IFA addition of 1% by two-stage AD process. Biogas production by the two-stage AD process enabled 18.5% higher energy recovery than single-stage AD. The 1% addition of IFA into high moisture MSW was useful for controlling pH of the two-stage AD process with enhanced biogas production between 87–92% when compared to without IFA addition. Electricity production and energy recovery from MSW using the coupled incineration with biogas production by two-stage AD process were 9,874 MJ ton−1 MSW and 89%, respectively. Conclusions The two-stage AD process with IFA addition for pH adjustment could improve biogas production from high moisture MSW, as well as reduce lag phase and enhance biodegradability efficiency. The coupled incineration process with biogas production using the two-stage AD process was suitable for the management of MSW with low area requirement, low greenhouse gas emissions, and high energy recovery.

Two-stage anaerobic digestion process for complete inactivation of enteric bacterial pathogens in human night soil

2004 ◽  
Vol 50 (6) ◽  
pp. 103-108 ◽  
Author(s):  
D.P. Kunte ◽  
T.Y. Yeole ◽  
D.R. Ranade
Keyword(s):  
Anaerobic Digestion ◽  
Bacterial Pathogens ◽  
Single Stage ◽  
Shigella Dysenteriae ◽  
Pathogen Inactivation ◽  
Two Stage ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Complete Inactivation ◽  
Stage Process

Anaerobic digestion offers a good alternative for human waste treatment. However, the fate of enteric bacterial pathogens present in human night soil (HNS) remains a major concern for hygienic safety of the process. A two-stage anaerobic digestion process, consisting of separate acidogenic and methanogenic digesters, was designed and its efficacy in the inactivation of Salmonella typhi was compared to a single-stage digestion process. In a single-stage digestion, complete pathogen inactivation was achieved only in the digesters with high levels of volatile fatty acids (VFA ≅18,000 mg/l) and acidic pH (≅6.0). These digesters, however, showed drastic reduction in methane yield. In the two-stage digestion process, S. typhi was completely inactivated in the acidogenic digester and the methanogenic digester was free from the pathogen even after receiving a daily dose of the pathogen. The process also achieved complete inactivation of other enteric pathogens, viz., Shigella dysenteriae and Vibrio cholerae. The two-stage process was efficient in biogas generation from HNS. Thus, the two-stage process ensures complete hygienic safety in anaerobic digestion of human night soil.

scholarly journals Characterization and anaerobic digestion of highly concentrated Mexican wine by-products and effluents

2020 ◽  
Vol 81 (1) ◽  
pp. 190-198 ◽  
Author(s):  
M. Vital-Jacome ◽  
M. Cazares-Granillo ◽  
J. Carrillo-Reyes ◽  
G. Buitron
Keyword(s):  
Anaerobic Digestion ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Single Stage ◽  
Organic Load ◽  
Organic Loading Rate ◽  
Two Stage ◽  
Wine Production ◽  
Stage Process ◽  
By Products

Abstract Wine production has increased in recent years, especially in developing countries such as Mexico. This increase is followed by an increase of winery effluents that must be treated to avoid environmental risks. However, little information is available about the characteristics of these effluents and the possible treatments. This paper aimed to characterize the effluents and by-products generated by the Mexican winery industry and to evaluate the performance and stability of the anaerobic treatment using a single-stage and a two-stage process. Results showed that the winery effluents had a high content of biodegradable organic matter, with chemical oxygen demand (COD) values ranging from 221 to 436 g COD/L. The single-stage anaerobic process was able to treat an organic loading rate of 9.6 kg COD/(m3 d); however, it was unstable and highly dependent on the addition of bicarbonate alkalinity (0.31 g NaHCO3/g COD removed). The two-stage process was more stable working at a higher organic load (12.1 kg COD/(m3 d)) and was less dependent on the addition of bicarbonate (0.17 g NaHCO3/g COD removed). The results highlight the potential of the winery effluents to produce methane through anaerobic digestion in a two-stage process, making wine production more sustainable.

Two-stage anaerobic digestion harnesses more energy from the co-digestion of end-of-life dairy products with agro-industrial waste compared to the single-stage process

2020 ◽  
Vol 153 ◽  
pp. 107404 ◽  
Author(s):  
Myrsini Sakarika ◽  
Konstantinos Stavropoulos ◽  
Alexandros Kopsahelis ◽  
Eleni Koutra ◽  
Constantina Zafiri ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
End Of Life ◽  
Dairy Products ◽  
Industrial Waste ◽  
Single Stage ◽  
Two Stage ◽  
Stage Process

Biogas production from brewery spent grain as a mono-substrate in a two-stage process composed of solid-state anaerobic digestion and granular biomass reactors

2017 ◽  
Vol 166 ◽  
pp. 519-529 ◽  
Author(s):  
Mario Panjičko ◽  
Gregor D. Zupančič ◽  
Lijana Fanedl ◽  
Romana Marinšek Logar ◽  
Marina Tišma ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Solid State ◽  
Biogas Production ◽  
Two Stage ◽  
Spent Grain ◽  
Stage Process ◽  
Granular Biomass
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