Anaerobic Processes

Kasiri, Sepideh; Mah, Fraser; Zhang, Chonggang; Haveroen, Melissa; Ellsworth, S. George; Ulrich, Ania C.

doi:10.2175/106143012x13407275694914

Cited by 8 publications

(5 citation statements)

References 134 publications

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“…The practice of co-digestion e ciently addresses the challenges outlined above. Blending substrates offers the exibility to adjust the C/N ratio within the desired range (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30), leading to enhanced process control and stability, increased gas yield, greater waste valorization, and improved economic feasibility. Additionally, the introduction of an external effective microorganisms (EM) solution can provide better control over the substrate-to-inoculum (S/I) ratio, resulting in increased gas production and a more balanced nutrient composition in the Digestate (Yan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

Choudhury,

Singh,

Lalwani

et al. 2024

Environ Sci Pollut Res

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A blend of organic municipal solid waste, slaughterhouse waste, faecal sludge, and land ll leachate opted as substrates in different mix ratios to formulate a pertinent mixture for biomethanation. Individual substrates were characterized and the mix ratio was optimized with the help of the response surface methodology tool to a value of 1:1:1:1 (against a C/N ratio of 28 ± 0.769 and VFA of 2500 ± 10.53) to improve the overall performance. The optimized blend (C/N ratio: 28.6, volatile fatty acids: 2538 mg/L) was characterized for physicochemical, biological, and microbial properties and subjected to anaerobic digestion in lab-scale reactors of 1000 ml capacity with and without the addition of inoculum. The gas yield of individual substrates and blends was ascertained separately. The observed cumulative gas yield over 21 days from the non-inoculated substrates varied between 133 to 2035 ml. While the addition of external inoculation at a 5% rate (w/w) against the substrate, uplifted the minimum and maximum cumulative gas yield values to 203 ml and 3394 ml. The inoculum procured from the Defence Research and Development Organisation (DRDO) was screened beforehand considering factors such as maximizing VFA production and consumption rate, gas yield, and quality of digestate. A similar outcome related to gas yield and digestate quality was observed for the equivalent blend. The cumulative gas yield value increased from 2627 ml to 4284 ml over 21 days post-application of a similar dosage of DRDO inoculum. Analysis of the 16S rRNA gene revealed that the predominant bacterial population belonged to the Firmicutes phylum, with the majority falling within the orders Clostridiales and Lactobacillales. Ultimately, the study advocates the potential of the aforementioned blend for anaerobic co-digestion to enhance the gas yield and digestate quality.

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Section: Introductionmentioning

confidence: 99%

Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

Choudhury,

Singh,

Lalwani

et al. 2024

Environ Sci Pollut Res

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“…Therefore, the treatment and reuse of wastewater is indispensable. Additionally, adequate management of water sources is critical in semiarid and dry regions of countries such as South Africa (SA) [ 1 , 2 ]. To protect both amphibian and earthbound living animals, the wastewater needs to be treated effectively before discharging it into freshwater sources [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Poultry Slaughterhouse Wastewater (PSW) Using a Pretreatment Stage, an Expanded Granular Sludge Bed Reactor (EGSB), and a Membrane Bioreactor (MBR)

et al. 2021

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This study presents the biological treatment of poultry slaughterhouse wastewater (PSW) using a combination of a biological pretreatment stage, an expanded granular sludge bed reactor (EGSB), and a membrane bioreactor (MBR) to treat PSW. This PSW treatment was geared toward reducing the concentration of contaminants present in the PSW to meet the City of Cape Town (CoCT) discharge standards and evaluate an alternative means of treating medium- to high-strength wastewater at low cost. The EGSB used in this study was operated under mesophilic conditions and at an organic loading rate (OLR) of 69 to 456 mg COD/L·h. The pretreatment stage of this laboratory-scale (lab-scale) plant played an important role in the pretreatment of the PSW, with removal percentages varying between 20% and 50% for total suspended solids (TSS), 20% and 70% for chemical oxygen demand (COD), and 50% and 83% for fats, oil, and grease (FOG). The EGSB further reduced the concentration of these contaminants to between 25% and 90% for TSS, 20% and 80% for COD, and 20% and >95% for FOG. The last stage of this process, i.e., the membrane bioreactor (MBR), contributed to a further decrease in the concentration of these contaminants with a peak removal performance of >95% for TSS and COD and 80% for the FOG. Overall, the system (pretreatment–EGSB–MBR) exceeded 97% for TSS and COD removal and 97.5% for FOG removal. These results culminated in a product (treated wastewater) meeting the discharge standards.

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“…Biogas is produced from a wide variety of waste in anaerobic digesters [1][2][3][4]. Anaerobic digestion is a process which transforms organic matter into gases such as methane and carbon dioxide.…”

Section: Introductionmentioning

confidence: 99%

Safety and reliability in biogas plants

Torretta

Copelli

Contini

et al. 2015

WIT Transactions on the Built Environment

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In the last ten years, everyone has been talking about biogas plants: politicians, ecologists, technicians, economists, laymen and experts. In other words: biogas has become fashionable. The energy crisis of the next few years shall be the shortage of fuel for the daily needs of millions of people and biogas plants seem to be a promising solution to help in solving this problem. Biogas plants are complicated enough to require both a total involvement with their specific technology and an accurate risk assessment for design purposes. With particular reference to this last feature, the number of accidents involving biogas plants has been too many to ignore. Frequent accident causes are: leakage in the storage tank and/or in the biogas distribution network, formation of flammable mixtures during maintenance operations, accidental release of H2S, effluent discharge and developing of high pressure inside the digester. Biogas plants are often operated wrongly, deficient in technological details and incorrectly scaled-up. Moreover, all these mistakes are repeated over and over again. Therefore, there is the pressing need for a quick procedure to assess the reliability of these plants in order to operate them safely. In this work, a simple but accurate risk assessment has been carried out on a case study biogas plant using a fault tree analysis applied to the top event "fire in the digester" (one of the main causes of accident in this plant's typology). Results have shown that the overall risk (considering one year of mission time) is less than 10 -8 . This value is acceptable considering that, near these plants, the number of inhabitants does not exceed 100 persons.

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Anaerobic Processes

Cited by 8 publications

References 134 publications

Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

Treatment of Poultry Slaughterhouse Wastewater (PSW) Using a Pretreatment Stage, an Expanded Granular Sludge Bed Reactor (EGSB), and a Membrane Bioreactor (MBR)

Safety and reliability in biogas plants

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