Optimization of the co-digestion of sewage sludge, maize straw and cow manure: microbial responses and effect of fractional organic characteristics

Wei, Liangliang; Qin, Kena; Ding, Jing; Xue, Mao; Yang, Chaoyong; Jiang, Junqiu; Zhao, Qingliang

doi:10.1038/s41598-019-38829-8

Cited by 48 publications

(21 citation statements)

References 30 publications

(33 reference statements)

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“…4). Biogas yield is closely racteristics (C/N ratio, pH, TS and VS), type of reactor, operation factors and microbial communities [54]. CY is a promising organic substrate for AD owing to its ease of digestibility.…”

Section: Biogas Productionmentioning

confidence: 99%

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Twizerimana

M’Arimi

Bura

et al. 2020

JENRR

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Aim: To investigate the feasibility of producing biogas from anaerobic co-digestion of cotton yarn wastes (CY) and human urine (HU) using fresh cow dung as the inoculum. Study Design: Anaerobic co-digestion of CY waste and HU and CY waste alone were done using batch reactors. Place and Duration of Study: CY were collected from Rivatex Eastern Africa Limited, Eldoret, Kenya while fresh cow manure used as inoculum was collected from a farm at Moi University, Eldoret, Kenya. Human urine sample was collected in a clean sterile container at Moi University hostel, Eldoret, Kenya. The experimental set up and analyses were performed at Chemical and Process Engineering Laboratory, Moi University, Kenya between January 2020 and May 2020. Methodology: CY, HU and fresh cow dung were subjected to physicochemical analysis. Batch anaerobic co-digestion of CY and HU, and CY alone were carried out under ambient temperature (25 ± 3 ) conditions for 95 days and 37 days, respectively. Results: The CY contained 90.46% total solids, 77.12% volatile solids and 9.54% moisture content while the corresponding values for HU were 2.9%, 58.5% and 97.1%, respectively. CY had a high carbon to nitrogen ratio. The biogas yield from anaerobic co-digestion was 35.6% more than digestion of CY alone. The highest daily biogas production for co-digestion and digestion of CY alone were 330 mL and 386 mL on day 12 and 21, respectively. The total biogas yield when CY co-digested for 95 days was 10,125 mL which decreased to 6,519 mL without co-digestion after 37 days. Conclusion: Our results showed that co-digestion produced more biogas than digestion of CY alone. Conclusively, the presence of HU during anaerobic digestion of CY enhanced the biogas production by more than 35.6% demonstrating that HU could be an effective waste for co-digestion of solid wastes such as CY. Further research should focus on monitoring parameters like temperature, buffering capacity and fatty acid levels to ensure optimal efficiency and maximum biogas yield.

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Section: Biogas Productionmentioning

confidence: 99%

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Twizerimana

M’Arimi

Bura

et al. 2020

JENRR

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“…The results of cumulative biogas production profiles for mono-digestion of sewage sludge and spent grain, along with co-digestion of a 1:1 ratio, is shown in Figure 7. As evident from Table 1, the C/N ratio and TS of both individual feedstocks were outside the optimal range for AD; however, when blended, they were within the optimal range [49]. As a result, biogas production was increased in volume using co-digested samples compared to sewage sludge alone.…”

Section: Methane Production: Batch Studiesmentioning

confidence: 95%

Enhancement of Biogas Production via Co-Digestion of Wastewater Treatment Sewage Sludge and Brewery Spent Grain: Physicochemical Characterization and Microbial Community

Mudzanani

Heerden²,

Mbhele

et al. 2021

Sustainability

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The present study intends to evaluate a synergy towards enhanced biogas production by co-digesting municipal sewage sludge (SS) with brewery spent grain (BSG). To execute this, physicochemical and metagenomics analysis was conducted on the sewage sludge substrate. The automatic methane potential test system II (AMPTS II) biochemical methane potential (BMP) batch setup was operated at 35 ± 5 °C, pH range of 6.5–7.5 for 30 days’ digestion time on AMPTS II and 150 days on semi-continuous setup, where the organic loading rate (OLR) was guided by pH and the volatile fatty acids to total alkalinity (VFA/TA) ratio. Metagenomics analysis revealed that Proteobacteria was the most abundant phyla, consisting of hydrolytic and fermentative bacteria. The archaea community of hydrogenotrophic methanogen genus was enriched by methanogens. The highest BMP was obtained with co-digestion of SS and BSG, and 9.65 g/kg of VS. This not only increased biogas production by 104% but also accelerated the biodegradation of organic matters. However, a significant reduction in the biogas yield, from 10.23 NL/day to 2.02 NL/day, was observed in a semi-continuous process. As such, it can be concluded that different species in different types of sludge can synergistically enhance the production of biogas. However, the operating conditions should be optimized and monitored at all times. The anaerobic co-digestion of SS and BSG might be considered as a cost-effective solution that could contribute to the energy self-efficiency of wastewater treatment works (WWTWs) and sustainable waste management. It is recommended to upscale co-digestion of the feed for the pilot biogas plant. This will also go a long way in curtailing and minimizing the impacts of sludge disposal in the environment.

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“…Rodríguez-Abalde et al [ 45 ] reported higher methane yields at a C/N ratio of 20–30. Wei et al [ 46 ] optimized the combination of CM, maize straw, and sewage sludge (35:35:30) for higher methane yields. Priya et al [ 47 ] performed co-digestion of plant biomass with organic wastes and found higher levels of volatile solids (VS) leading to improved levels of biogas yield.…”

Section: Bgs: Source Composition and Agricultural Applicationsmentioning

confidence: 99%

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

Kumar

Verma

Sharma

et al. 2022

Biomass Conv. Bioref.

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Graphical abstract The residual slurry obtained from the anaerobic digestion (AD) of biogas feed substrates such as livestock dung is known as BGS. BGS is a rich source of nutrients and bioactive compounds having an important role in establishing diverse microbial communities, accelerating nutrient use efficiency, and promoting overall soil and plant health management. However, challenges such as lower C/N transformation rates, ammonia volatilization, high pH, and bulkiness limit their extensive applications. Here we review the strategies of BGS valorization through microbial and organomineral amendments. Such cohesive approaches can serve dual purposes viz. green organic inputs for sustainable agriculture practices and value addition of biomass waste. The literature survey has been conducted to identify the knowledge gaps and critically analyze the latest technological interventions to upgrade the BGS for potential applications in agriculture fields. The major points are as follows: (1) Bio/nanotechnology-inspired approaches could serve as a constructive platform for integrating BGS with other organic materials to exploit microbial diversity dynamics through multi-substrate interactions. (2) Advancements in next-generation sequencing (NGS) pave an ideal pathway to study the complex microflora and translate the potential information into bioprospecting of BGS to ameliorate existing bio-fertilizer formulations. (3) Nanoparticles (NPs) have the potential to establish a link between syntrophic bacteria and methanogens through direct interspecies electron transfer and thereby contribute towards improved efficiency of AD. (4) Developments in techniques of nutrient recovery from the BGS facilities’ negative GHGs emissions and energy-efficient models for nitrogen removal. (5) Possibilities of formulating low-cost substrates for mass-multiplication of beneficial microbes, bioprospecting of such microbes to produce bioactive compounds of anti-phytopathogenic activities, and developing BGS-inspired biofertilizer formulations integrating NPs, microbial inoculants, and deoiled seed cakes have been examined.

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Optimization of the co-digestion of sewage sludge, maize straw and cow manure: microbial responses and effect of fractional organic characteristics

Cited by 48 publications

References 30 publications

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Enhancement of Biogas Production via Co-Digestion of Wastewater Treatment Sewage Sludge and Brewery Spent Grain: Physicochemical Characterization and Microbial Community

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

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