Energy Potential of Digestate Produced by Anaerobic Digestion in Biogas Power Plants: The Case Study of Croatia

Đurđević, Dinko; Blecich, Paolo; LenićKristian,

doi:10.1089/ees.2018.0123

Cited by 12 publications

(11 citation statements)

References 15 publications

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“…The Croatian sector of production and utilization of biogas is one of the less presented, but also a very dynamic sector among RES. Activities within the biogas production sector in Croatia started in 2007, by the enactment of Law on Energy [25]. By today, there are 37 operational plants and an additional 11 in the process of acquiring the FiT contract [26].…”

Section: State-of-art In Croatiamentioning

confidence: 99%

“…The third option (Option 3) considers standard biogas plant (described as Option 4), but including an additional upgrade with plant for energy recovery of digestate by incineration [25]. The process will include digestate drying by utilizing surplus heat energy produced in biogas plant's cogeneration unit (CHP) and produced electrical energy will be used for covering the demand of this new plant Processes 2020, 8, 142 5 of 15 or sold in the the electrical power system (EPS).…”

Section: Options For Digestate Treatmentmentioning

confidence: 99%

“…Moreover, it is possible to consider the utilization of digestate liquid fraction as fertigation liquid. Option 3 (digestate incineration) has higher costs-mainly due to small feedstock amounts used for the process [25], but also due to maintenance of the plant. CAPEX amounts to 9,000,000 HRK, while OPEX and maintenance costs amount to 1,000,000 HRK and 900,000 HRK annually, respectively [25,37].…”

Section: Calculation Of Potential Cost Reduction and Profitmentioning

confidence: 99%

“…Option 3 (digestate incineration) has higher costs-mainly due to small feedstock amounts used for the process [25], but also due to maintenance of the plant. CAPEX amounts to 9,000,000 HRK, while OPEX and maintenance costs amount to 1,000,000 HRK and 900,000 HRK annually, respectively [25,37]. CAPEX in this case includes reactor, dryer, and scrubber construction, while OPEX includes chemicals necessary for operation, electric energy, maintenance, and personnel costs.…”

Section: Calculation Of Potential Cost Reduction and Profitmentioning

confidence: 99%

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Anaerobic Digestate Treatment Selection Model for Biogas Plant Costs and Emissions Reduction

Đurđević

Hulenić

2020

Processes

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Agriculture is one of the leading sectors on the global level contributing to greenhouse gas (GHG) emissions increase. With the utilization of biogas production technology within the agriculture sector, ecological benefits could be achieved, with immediate economic profit. Therefore, to retain economic profit and environmental sustainability, implementation of bioeconomy principles is of key importance. This paper examines four options of digestate treatment, which is identified as one of the highest operational cost for the biogas plant. A simple and robust model in Excel Solver was developed to determine the best solution for minimising GHG emissions and maximise profit for the biogas plant operator, through an upgrade of the plant with digestate treatment technologies. The model was implemented on a case of a Croatian biogas plant and the best solution in terms of GHG reduction and profit increase proved to be fertilizer production (Option 1), through a crystallization process of struvite within the digestate. This option obtains a significant reduction in GHG emissions compared to standard biogas production without additional upgrades (Option 4), by over 90%, and increase of profit for the biogas plant operator, which diversifies the income source and creates multiple positive impacts on the environment.

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Section: State-of-art In Croatiamentioning

confidence: 99%

Section: Options For Digestate Treatmentmentioning

confidence: 99%

Section: Calculation Of Potential Cost Reduction and Profitmentioning

confidence: 99%

Section: Calculation Of Potential Cost Reduction and Profitmentioning

confidence: 99%

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Anaerobic Digestate Treatment Selection Model for Biogas Plant Costs and Emissions Reduction

Đurđević

Hulenić

2020

Processes

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“…In the past 20 years in the EU, sewage sludge treatment has relied on three main processes: dewatering and drying, stabilisation by anaerobic digestion and thermal treatment [13,14]. Anaerobic digestion (AD) is the preferred stabilisation method as it produces biogas, a valuable energy source [15]. In 2016, the EU produced 16.1 Mtoe (Million of tonnes of oil equivalent) of biogas, with sewage sludge feedstock contributing with 1.4 Mtoe of biogas (8.7%) [16].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Sewage Sludge: The Case Study of Croatia

2019

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Croatia produced 21,366 tonnes of dry matter (DM) sewage sludge (SS) in 2016, a quantity expected to surpass 100,000 tonnes DM by 2024. Annual production rates for future wastewater treatment plants (WWTP) in Croatia are estimated at 5.8–7.3 Nm3/people equivalent (PE) for biogas and 20–25 kgDM/PE of sewage sludge. Biogas can be converted into 12–16 kWhel/PE of electricity and 19–24 kWhth/PE of heat, which is sufficient for 30–40% of electrical and 80–100% of thermal autonomy. The WWTP autonomy can be increased using energy recovery from sewage sludge incineration by 60% for electricity and 100% of thermal energy (10–13 kWhel/PE and 30–38 kWhth/PE). However, energy for sewage sludge drying exceeds energy recovery, unless solar drying is performed. The annual solar drying potential is estimated between 450–750 kgDM/m2 of solar drying surface. The lower heating value of dried sewage sludge is 2–3 kWh/kgDM and this energy can be used for assisting sludge drying or for energy generation and supply to WWTPs. Sewage sludge can be considered a renewable energy source and its incineration generates substantially lower greenhouse gases emissions than energy generation from fossil fuels. For the same amount of energy, sewage sludge emits 58% fewer emissions than natural gas and 80% less than hard coal and fuel oil. Moreover, this paper analysed the feasibility of sludge disposal practices by analysing three scenarios (landfilling, co-incineration, and mono-incineration). The analysis revealed that the most cost-effective sewage sludge disposal method is landfilling for 60% and co-incineration for 40% of the observed WWTPs in Croatia. The lowest CO2 emissions are obtained with landfilling and mono-incineration in 53% and 38% of the cases, respectively.

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Analogous study of cumulative biogas production by anaerobic digestion of sewage treatment plant sludge, the proposal of universal dimensionless models

Ameri

Hanini

2023

Energy Science & Engineering

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The current global concern is how to replace polluting fossil fuels with sustainable green fuels. On this basis, in this study, a characterization protocol for sewage sludge in Algeria was carried out. Their objective was to study the process of anaerobic digestion for biogas production by analogy to experiments that have already been made in the literature. The performance of the proposed models has been validated with experimental data from the scientific literature. Biodegradable organic matter levels are high (160–500 mg L−1) giving an acceptable yield for biogas production. The modeling of cumulative biogas production was carried out by Gompertz and models were proposed for different products. It has been observed that there is a better agreement of the models proposed with the experimental data with a maximum value of r2 = 0.9996. The modeling of the degradation of organic matter was carried out by the first order‐model, and dimensionless models were proposed. The latter gave a good agreement with the experimental data better than the model in the literature, with a maximum value of r2 = 0.9985. The proposed models to study the anaerobic digestion process of organic matter, as well as those related to the process of cumulative biogas production, are universal (without units of measurement), which will help producers in this field to improve production, as well as reduce the investment cost through preliminary simulations.

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Energy Potential of Digestate Produced by Anaerobic Digestion in Biogas Power Plants: The Case Study of Croatia

Cited by 12 publications

References 15 publications

Anaerobic Digestate Treatment Selection Model for Biogas Plant Costs and Emissions Reduction

Anaerobic Digestate Treatment Selection Model for Biogas Plant Costs and Emissions Reduction

Energy Recovery from Sewage Sludge: The Case Study of Croatia

Analogous study of cumulative biogas production by anaerobic digestion of sewage treatment plant sludge, the proposal of universal dimensionless models

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