Preliminary investigation on the use of biogas sludge for gasification

Gnanendra, P M; Ramesha, D. K.; Dasappa, S.

doi:10.1080/1478646x.2011.559550

Cited by 17 publications

(6 citation statements)

References 26 publications

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“…Considering the low filling factor, a lighter interaction between the process gas and char occurs compared to other gasifier such as downdraft or fluidized bed gasifier. Due to this aspect, gas yields and the yield of residual char are, respectively lower and higher than that observed in other gasification reactors [19,20].…”

Section: Experimental Study Resultsmentioning

confidence: 60%

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Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Freda

Nanna

Villone

et al. 2019

Int J Energy Environ Eng

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In this study energy recovery of digestate from a biogas plant was investigated via air gasification. Gasification tests were executed in a pilot scale rotary kiln plant having a nominal biomass feeding rate of about 20 kg/h. The equivalence ratio was varied from 0.22 to 0.39 with the goal to approach the autothermal condition. Tests were carried out for 5 h in steady state condition. Syngas composition, char and gas yields were measured. To improve the cold gas efficiency of the process, a mixture of digestate and almond shells (60:40 wt%) was gasified. Autothermal condition was reached with the mixture using equivalence ratio of 0.30 where the corresponding cold gas efficiency achieved the maximum value of 55%. The raw gas had a lower heating value of 4-5 MJ/Nm 3. To evaluate possible improvements in the produced gas properties, in this work the effect of steam injection was also investigated.

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Section: Experimental Study Resultsmentioning

confidence: 60%

“…The reactor was able to handle the high ash content present in the fuel. Engine operation indicated that gas quality was consistent with specific fuel consumption of 1.6 kg/ kWh amounting to an overall electrical efficiency of 15% [20]. One of the concerns in digestate gasification is the high ash content.…”

Section: Introductionmentioning

confidence: 93%

Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Freda

Nanna

Villone

et al. 2019

Int J Energy Environ Eng

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show abstract

“…However, several issues remain to be addressed by further investigations. For example, the ash content of AD effluent was usually high (15-20%), which may cause disposal concerns (Kratzeisen et al, 2010;Gnanendra et al, 2012). Additionally, AD effluent must be dried to a low moisture content (<10%) prior to gasification, pyrolysis, or direct incineration in order to maintain energy efficiency.…”

Section: Pollutantmentioning

confidence: 99%

“…Gnanendra et al (2012) studied gasification using AD effluent briquettes generated from the AD of several lignocellulosic biomasses, including agricultural residues and industrial processing residues. The produced syngas had consistent composition and quality acceptable for engine operation (Gnanendra et al, 2012). Also, the process maintained lower gaseous emissions compared with incineration.…”

Section: Reuse Of Ad Fibers For Fuelsmentioning

confidence: 99%

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

et al. 2015

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Effective treatment and reuse of the massive quantities of agricultural and food wastes generated daily has the potential to improve the sustainability of food production systems. Anaerobic digestion (AD) is used throughout the world as a waste treatment process to convert organic waste into two main products: biogas and nutrient-rich digestate, called AD effluent. Biogas can be used as a source of renewable energy or transportation fuels, while AD effluent is traditionally applied to land as a soil amendment. However, there are economic and environmental concerns that limit widespread land application, which may lead to underutilization of AD for the treatment of agricultural and food wastes. To combat these constraints, existing and novel methods have emerged to treat or reuse AD effluent. The objective of this review is to analyze several emerging methods used for efficient treatment and reuse of AD effluent. Overall, the application of emerging technologies is limited by AD effluent composition, especially the total solid content. Some technologies, such as composting, use the solid fraction of AD effluent, while most other technologies, such as algae culture and struvite crystallization, use the liquid fraction. Therefore, dewatering of AD effluent, reuse of the liquid and solid fractions, and land application could all be combined to sustainably manage the large quantities of AD effluent produced. Issues such as pathogen regrowth and prevalence of emerging organic micro-pollutants are also discussed.

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“…As mentioned before, digestate is a stream derived from municipal solid waste management, which needs to be further valorized, with respect to the actual utilization as feedstock for compost production. Few research works are available in the literature concerning gasification of digestate, although it may be considered a strategy to produce syngas in a sustainable way [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Process Simulation and Environmental Aspects of Dimethyl Ether Production from Digestate-Derived Syngas

Giuliano

Catizzone

Freda

2021

IJERPH

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The production of dimethyl ether from renewables or waste is a promising strategy to push towards a sustainable energy transition of alternative eco-friendly diesel fuel. In this work, we simulate the synthesis of dimethyl ether from a syngas (a mixture of CO, CO2 and H2) produced from gasification of digestate. In particular, a thermodynamic analysis was performed to individuate the best process conditions and syngas conditioning processes to maximize yield to dimethyl etehr (DME). Process simulation was carried out by ChemCAD software, and it was particularly focused on the effect of process conditions of both water gas shift and CO2 absorption by Selexol® on the syngas composition, with a direct influence on DME productivity. The final best flowsheet and the best process conditions were evaluated in terms of CO2 equivalent emissions. Results show direct DME synthesis global yield was higher without the WGS section and with a carbon capture equal to 85%. The final environmental impact was found equal to −113 kgCO2/GJ, demonstrating that DME synthesis from digestate may be considered as a suitable strategy for carbon dioxide recycling.

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Preliminary investigation on the use of biogas sludge for gasification

Cited by 17 publications

References 26 publications

Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Beyond land application: Emerging technologies for the treatment and reuse of anaerobically digested agricultural and food waste

Process Simulation and Environmental Aspects of Dimethyl Ether Production from Digestate-Derived Syngas

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