RETRACTED: Biogas production–A review on composition, fuel properties, feed stock and principles of anaerobic digestion

Bharathiraja, B.; Sudharsana, T.; Jayamuthunagai, J.; Praveenkumar, R.; Chozhavendhan, S.; Iyyappan, J.

doi:10.1016/j.rser.2018.03.093

Cited by 272 publications

(119 citation statements)

References 163 publications

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“…Meanwhile, the high chemical oxygen demand, dissolved salts content and micro-pollutant make certain biogenic wastes difficult to be handled by the conventional biological approach. New and more integrated anaerobic treatments for biogas production and material recycling may thereby need to be considered and evaluated [161][162][163][164][165][166][167][168][169][170][171][172][173]. It is firmly believed by the authors that, due to the large volume and heterogeneity of waste produced, from both an economical and technological point of view, the best solution for organic wastes does not always lie in the choice and implementation of a single or typical process technology.…”

Section: Waste Valorizationmentioning

confidence: 99%

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Tsui

Wong

2019

Waste Dispos. Sustain. Energy

143

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Municipal solid waste (MSW) management has emerged as probably the most pressing issue many governments nowadays are facing. Traditionally, Waste-to-Energy(WtE) is mostly associated with incineration, but now, with the emergence of the bioeconomy, it embraces a broader definition comprising any processing technique that can generate electricity/heat or produce a waste-derived fuel. Under the ambit of the circular economy many nations are looking for, additional effort must be made to be sure of acquiring the most updated information and paving a sustainable path for managing MSW in such a frame. In this regard, we have undertaken a critical review of various technologies, with their updated progress, involved in the exploitation of MSW as a renewable resource, along with the critical advantages and limitations on energy and material cycling for sustainable MSW management. Incineration, the most widely used method, is nowadays difficult to further apply due to its dubious reputation and social opposition. Meanwhile, to address the organic fraction of MSW which currently is mostly unrecycled and causes disposal issues, the biological approach presents an attractive option. The new emphasis of bioeconomy leads us to understand how environmental biotechnologies should be better connected/integrated for more sustainable MSW management. This article is concluded with advances of future prospects, which can serve as a timely reminder to encourage competent authorities/researchers to work towards further improvement of the present MSW management system.

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Section: Waste Valorizationmentioning

confidence: 99%

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Tsui

Wong

2019

Waste Dispos. Sustain. Energy

143

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“…Anaerobic digestion is complex in comparison to a mixed-culture system with different operational and performance variables (pH, temperature, salts, alkalinity), and there is a lack of information on the physical, chemical and biochemical interactions during the digestion [137]. The success of anaerobic digestion depends on the composition of solid substrate (20-30%), external addition of complex media and nitrogen source, release of toxic compounds (hydrogen sulfide production), accumulation of metabolites decreases methane yield and use of conventional digestion (with limited scope for technology improvements) has very less economic viability [8,137,138].…”

Section: Advantages Of Mixed-culture For Hydrogen Productionmentioning

confidence: 99%

Seed Pretreatment for Increased Hydrogen Production Using Mixed-Culture Systems with Advantages over Pure-Culture Systems

et al. 2019

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Hydrogen is an important source of energy and is considered as the future energy carrier post-petroleum era. Nowadays hydrogen production through various methods is being explored and developed to minimize the production costs. Biological hydrogen production has remained an attractive option, highly economical despite low yields. The mixed-culture systems use undefined microbial consortia unlike pure-cultures that use defined microbial species for hydrogen production. This review summarizes mixed-culture system pretreatments such as heat, chemical (acid, alkali), microwave, ultrasound, aeration, and electric current, amongst others, and their combinations to improve the hydrogen yields. The literature representation of pretreatments in mixed-culture systems is as follows: 45–50% heat-treatment, 15–20% chemical, 5–10% microwave, 10–15% combined and 10–15% other treatment. In comparison to pure-culture mixed-culture offers several advantages, such as technical feasibility, minimum inoculum steps, minimum media supplements, ease of operation, and the fact it works on a wide spectrum of low-cost easily available organic wastes for valorization in hydrogen production. In comparison to pure-culture, mixed-culture can eliminate media sterilization (4 h), incubation step (18–36 h), media supplements cost ($4–6 for bioconversion of 1 kg crude glycerol (CG)) and around 10–15 Millijoule (MJ) of energy can be decreased for the single run.

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“…The various researchers reported that the EC can enhance the efficiencies of an AD. It was reported that 1.00 m 3 of the biogas can replace ~ 600 mL of the petroleum oil [8][9][10]. Normal biogas contains a mixture of CH 4 (55-75%), CO 2 (35-40%), H 2 O (1%) and other gases like H 2 S, SO 2 , NO 2 , H 2 , CO in lower proportions [11,12] ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Advancement in biogas production from the solid waste by optimizing the anaerobic digestion

Srivastava

2020

Waste Dispos. Sustain. Energy

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The crisis of fossil fuel and their negative impact on the environment has caused concern among the scientific communities leading them to look around for renewable sources of energy. This review has emphasized the efficient utilization of organic municipal solid waste as well as agriculture waste in an anaerobic digester for the production of biogas as a sustainable renewable energy. Recent advances in biogas production along with previous research work have been discussed to offer a comprehensive synopsis of the accumulated knowledge. This review also elucidates about the design of an anaerobic digester, the prospect of anaerobic digestion and opportunity in new advances in technology. Biogas is one of the most accepted sustainable renewable energy. The characterization, elimination of contaminants, pretreatment, anaerobic digestion in optimum condition and utilization of energy crops enhanced the efficiency of an anaerobic digester. Pretreatment of segregated organic solid waste increased its putrescibility and further biogas production. The optimized parameters in this review were pH, temperature, loading rate, C/N ratio and solid/liquid ratio of the feedstock. The flow rate of the feedstock was optimized according to the available volume of the digester, residence time and the characteristics of the feedstock. The design of an anaerobic digester should be preferably cylindrical in shape, with a diameter ranging from 6 to 40 m, the depth ranging from 7.5 to 15 m and the conical floor having a slope around 15%. A comprehensive reform in technical, economic, and social policies is essential to accomplish a sustainable energy system considering biogas as a future renewable energy. The flowsheet of the biogas and methanol production has been given in Fig. 1.

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RETRACTED: Biogas production–A review on composition, fuel properties, feed stock and principles of anaerobic digestion

Cited by 272 publications

References 163 publications

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Seed Pretreatment for Increased Hydrogen Production Using Mixed-Culture Systems with Advantages over Pure-Culture Systems

Advancement in biogas production from the solid waste by optimizing the anaerobic digestion

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