Nutrients recovery from anaerobic digestate of agro-waste: Techno-economic assessment of full scale applications

Bolzonella, David; Fatone, Francesco; Gottardo, Marco; Frison, Nicola

doi:10.1016/j.jenvman.2017.08.026

Cited by 140 publications

(79 citation statements)

References 17 publications

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“…Alguns processos físicos têm sido estudados para a remoção de fósforo. Os principais são uso de membranas (Bolzonella et al, 2018), eletrodiálise e processos de adsorção (Kunaschk et al, 2015). Entretanto, apesar da boa eficiência na remoção de fósforo, o custo elevado destes processos ainda limita uma aplicação em escala real.…”

Section: Remoção De Fósforo Por Processos Físicosunclassified

“…Bolzonella e colaboradores (Bolzonella et al, 2018) comparam diferentes sistemas de recuperação de nutrientes (P e N) utilizados em escala comercial no norte da Itália, os quais combinam processos físicos e químicos: secagem seguida de recuperação ácida, stripping seguido de recuperação ácida e separação por membrana. Neste estudo, observaram que o uso de membranas permite a obtenção de um efluente líquido de alta pureza (água de reúso), embora seja o tratamento de maior custo entre os estudados.…”

Section: Remoção De Fósforo Por Processos Físicosunclassified

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Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Kunz¹,

Steinmetz²,

Amaral³

2019

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Section: Remoção De Fósforo Por Processos Físicosunclassified

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Kunz¹,

Steinmetz²,

Amaral³

2019

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“…It is advisable to divide the heating of the fermenters into summer and winter periods, as in the summer 25 kWh of heat is needed to heat up a ton of incoming substrate, while in winter this figure is 36 kWh. On the basis of other results, a 1 MW capacity biogas plant generates an average of 1000 kWh of heat per day, of which 250 kWh in winter and 100 kWh of heat in summer is needed to heat the fermenters at 38 • C, i.e., using 25% and 10% of the generated heat energy [23][24][25]. The seasonal fluctuations in its own heat consumption play a significant role in the fact that a total heat utilization solution is quite problematic, since in the case of heat utilization the heat generated during the summer period is lost, and so the technological (daily evenly uniform) use of waste heat available in different amounts in winter and summer makes the purchase of external heat energy necessary.…”

Section: The Characteristic Technological Parameters Of Cogeneration mentioning

confidence: 99%

“…After separation, the solid phase is typically dried on a belt dryer at 70-80 • C during which the heat energy from the CHP plant passes through the belt and the material on it from bottom to top in the form of hot air. During the drying, the specific heat energy required to extract one ton of water is 1-1.1 MWh [25,52].…”

Section: Technological Processes Of Biogas Fuel Pellet Productionmentioning

confidence: 99%

Economic Analysis of Pellet Production in Co-Digestion Biogas Plants

et al. 2018

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In our paper we examine the economics of a technological process which utilizes the separated biogas plant digestate as the primary material and, as auxiliary material, the waste heat produced by the cogeneration process, to produce a marketable pellet which can be used in two ways (to supply soil nutrients and heat energy). Using multivariate linear regression model we developed an equation for the biogas yield from the modelled production recipe and expected nutrient pellet prices, and sensitivity analysis were also performed for the substrate dry matter content. We found that pellets can be produced at a cost of 88-90 EUR/ton with a 6 to 10% dry matter substrate content and that, primarily, sales of pellets for heating justify pelleting; producer's own use and use for nutrient purposes can only be justified in exceptional cases. In the case of dry solid content above 5%, the process does not require the total amount of waste heat; some of this can be used to cover other heat requirements.

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“…The gas rich in ammonia is then transferred to an air scrubber and treated with sulfuric acid (H 2 SO 4 ), to form and recover a concentrated solution of ammonium sulfate, (NH 4 ) 2 SO 4 , a common commercial fertilizer [6,14]. This process is characterized by high energy consumption to heat the digestate in the stripper till to 80 °C, and by high reagents consumption: NaOH to increase pH before stripping and H 2 SO 4 during the process [11,15].…”

Section: Introductionmentioning

confidence: 99%

Exploitation of Solar Energy for Ammonium Sulfate Recovery from Anaerobic Digestate of Different Origin

Battısta

Bolzonella

2019

Waste Biomass Valor

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Digestate represents the semi-liquid byproduct of the anaerobic digestion process. It was estimated that 56 Mtonnes of digestate are annually produced only in Europe. Digestate composition depends on the initial total solids (TS) mixture fed to the digester and by its origin (manure, food wastes, agricultural residues, wastewater sludge). Typical values for the different components include a stabilized organic matter content between 20 and 50 g/L, a good content of nitrogen compounds (2-8 g/kg) and of phosphorous compounds (up to 3 g/kg). In particular, ammonia presence in digestate is interesting for ammonium sulfate production, a fertilizer which favors plants' growth. Traditional ammonium sulfate synthesis is conducted by stripping followed by sulfuric acid absorption, a process which requires high energy and chemicals consumptions. This work investigates the exploitation of solar energy to evaporate the liquid phase of digestate in a lab-scale greenhouse. Digestate vapors, rich in ammonia, are sent in a Drechsler trap, filled with 38% w/w sulfuric acid solution, through three solar air fans. The process has been tested on digestates differing for TS content and origin. It emerged that the process is favored by digestates with high ammonia content, as those originated from manure, and a TS content of about 10% w/w, which allowed to obtain an ammonium sulfate concentration of about 2 M in the final solution. Statement of NoveltyTraditional ammonium sulfate production from digestate requires a previous solid/liquid separation, further polishing of the liquid phase, followed by stripping and absorption in a sulfuric acid solution. This process is characterized by high energy consumption to heat the digestate and by high reagents consumption. This work proposes an innovative and an environmental sustainable way for the ammonium sulfate recovery from digestate, without a previous solid/ liquid separation. In particular, solar energy is exploited to dry the digestate and to recover ammonia vapors, which are sent to a trap containing H 2 SO 4 to allow the ammonium sulfate production.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Nutrients recovery from anaerobic digestate of agro-waste: Techno-economic assessment of full scale applications

Cited by 140 publications

References 17 publications

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Economic Analysis of Pellet Production in Co-Digestion Biogas Plants

Exploitation of Solar Energy for Ammonium Sulfate Recovery from Anaerobic Digestate of Different Origin

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