Thermochemical Decomposition of Sewage Sludge � An Eco-Friendly Solution for a Sustainable Energy Future by Using Wastes

Zaharioiu, Anca; Bucura, Felicia; Ionete, Eusebiu Ilarian; Ionete, Roxana Elena; Ebrasu, D.; Şandru, Claudia; Marin, Florian; Oancea, Simona; Niculescu, Violeta; Miricioiu, Marius Gheorghe; Constantinescu, Marius

doi:10.37358/rc.20.10.8361

Cited by 18 publications

(22 citation statements)

References 25 publications

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“…When comparing the methane content produced in this study with another pretreatment like the pyrolysis process, a different trend was seen [61,62]. The studies performed high-temperature pyrolysis on sewage sludge and plastics as substrates.…”

Section: Biogas Production Yield and Methane Content In The Cstr Reactormentioning

confidence: 78%

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Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

et al. 2021

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In this study, semi-continuous anaerobic digestion of lignin-rich steam-exploded Ludwigia grandiflora (Lignin = 25.22% ± 4.6% total solids) was performed to understand better the effect of steam explosion on the substrate solubilisation and inhibitors formation during the process. Steam explosion pretreatment was performed at 180 °C for 30 min at a severity factor of 3.8 to enhance the biogas yield of the lignocellulosic biomass. The semi-continuous anaerobic digestion was performed in a continuously stirred tank reactor for 98 days at an initial hydraulic retention time of 30 days and an organic loading rate of 0.9 g-VS L−1day−1. The performed steam explosion pretreatment caused biomass solubilisation, resulting in enhanced biogas production during the process. During the anaerobic digestion process, the average biogas yield was 265 mL g-VS−1, and the pH throughout the operation was in the optimum range of 6.5–8.2. Due to fluctuations in the biogas yield, the hydraulic retention time and organic loading rate were changed on day 42 (50 days and 0.5 g-VS L−1day−1) and on day 49 (40 days and 0.7 g-VS L−1day−1), and 1 M of NaOH was added to the liquid fraction of the steam-exploded L. grandiflora during the latter part of the operation to maintain the stability in the reactor. Therefore, the steam explosion pretreatment helped in the degradation of L. grandiflora by breaking the lignocellulose structure. In addition, changes in the operating conditions of the anaerobic digestion led to an increase in the biogas production towards the end of the process, leading to the stability in the CSTR.

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Section: Biogas Production Yield and Methane Content In The Cstr Reactormentioning

confidence: 78%

“…The value of C1 (vol%), mainly methane, ranged from 0.24 to 4.94% [61]. However, when sludge was used for pyrolysis, the value was 33.41% higher than the methane produced by conventional biogas (29.12%) using garbage [62].…”

Section: Biogas Production Yield and Methane Content In The Cstr Reactormentioning

confidence: 99%

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

et al. 2021

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“…Modern civilization is currently looking for renewable and environmentally friendly combustible energy resources [6]. Municipal and industrial waste, agricultural products, and by-products can be valuable energy sources for a sustainable energy future [7,8]. Organic raw materials can be used as feedstock for biofuel production.…”

Section: Introductionmentioning

confidence: 99%

Energy Assessment of Sorghum Cultivation in Southern Ukraine

et al. 2021

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Global climate changes and fossil fuel reserve depletion are drivers for the search for environmentally friendly renewable energy sources. In Europe, biomass represents the main alternative to fossil fuels. Among energy crops, sorghum is a promising crop for arid regions. The biomass yield and energy efficiency of sorghum (both silage and grain) were studied based on field experiments conducted in Southern Ukraine. The following climate changes were identified: an increase in temperature and a decrease in precipitation. The total energy inputs for sweet sorghum were estimated at 11.256 GJ/ha. The main contributors to the energy inputs are mineral fertilizers (56.99%). The experiment showed that a yield of 40.6 t/ha could be achieved with annual precipitation of 350 mm. The energy efficiency ratio was determined to be 11.18. The total energy inputs for grain sorghum was 16.081 GJ/ha. Its yield (grain) varied from 1.92 to 7.05 t/ha. The energy efficiency ratio of grain sorghum ranged from 2.8 to 16.7.

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“…Among these, different kinds of biomass stand out, like agricultural crop residues [9][10][11][12], agroindustrial residues [13][14][15], forest biomass [16] and wood processing industry residues [17,18]. Other wastes benefit from this advantageous method of valorization, such as sewage sludge [19][20][21] or waste paper [22]. CFP could become a green energy source based on its close composition to wastepaper.…”

Section: Introductionmentioning

confidence: 99%

Valorization of Insulation Cellulose Waste as Solid Biomass Fuel

et al. 2021

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This paper investigates the ability of insulation cellulose fiber powder (CFP) to be pelletized for its valorization as biomass fuel. CFP is a waste originating from insulation cellulose manufacturing that lacks any method of valorization because of its boron salts content. A sugar byproduct and lignosulfonate (LS) were considered as binders for the pellet manufacturing process. Physical tests were carried out to characterize the pellets’ performance. Chemical and combustion tests were considered to state the pellets’ potential as a green energy source. Raw CFP showed good ability in its pelletization and durability in the range of 15–30% of moisture content. The pellet’s density decreased as water content increased. Binders increased the pellet’s length before and after the durability test. Binders also increased the CFP pellet’s water absorption, demonstrating a potential decrease in durability against environmental factors. Binders also decreased the lower heating value. Ultimate analysis showed a slight Nitrogen increase in both binder combinations that could potentially raise the pollutant NOx combustion emissions. All the combinations showed adequate combustion characteristics, but binders increased ash production. Additives decreased the CFP volatile matter content and increased the fixed carbon, which could facilitate a more stable combustion. DTA curves showed a mass loss rate decrease in the volatile stage for the binder combinations, which also could be considered as an indicator of a more stable combustion. The ashes’ chemical compositions when analyzed by XPS showed boron contents oscillating between 10.03% and 16.42%, demonstrating the possibility of recovering them from the combustion ashes.

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Thermochemical Decomposition of Sewage Sludge � An Eco-Friendly Solution for a Sustainable Energy Future by Using Wastes

Cited by 18 publications

References 25 publications

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

Energy Assessment of Sorghum Cultivation in Southern Ukraine

Valorization of Insulation Cellulose Waste as Solid Biomass Fuel

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