Treatment of digestate from a co-digestion biogas plant by means of vacuum evaporation: Tests for process optimization and environmental sustainability

Chiumenti, Alessandro; Borso, Francesco da; Chiumenti, R.; Teri, F.; Segantin, P.

doi:10.1016/j.wasman.2013.02.023

Cited by 57 publications

(30 citation statements)

References 8 publications

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“…The dairy digestate liquid fraction (DDLF) had a density of 1.010 ± 0.001 kg dm -3 and an average nitrogen content of 3.79 ± 0.02 kg m -3 while the raw swine slurry (RSS) had a density of 1.003 ± 0.001 kg dm -3 and an average nitrogen content of 3.04 ± 0.03 kg m -3 (table 2). These values are well within the range of previously reported tests (CRPA, 2012;Negri and Maggiore, 2012;Brambilla et al, 2013;Chiumenti et al, 2013). An analysis of the data showed that the density and nitrogen content were not significantly dependent on the distribution conditions, indicating that the tanker was able to maintain the homogeneity of the slurry during the field operations.…”

Section: Resultssupporting

confidence: 91%

A Retrofit Variable-Rate Control System for Pressurized Slurry Tankers

2015

Appl. Eng. Agric.

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ffluent management has become increasingly important among livestock farming activities because of: i) the need to valorize a sub-product with a high fertilizing potential, ii) the high costs associated with spreading operations, and iii) the environmental impacts that could result from inadequate effluent management at the farm level. Due to this issue, the European Commission issued several Directives aimed at protecting the environment while ensuring that farmers could achieve proper production levels (Ruiz-Ramos et al., 2011). In particular, Directive 91/676/EC is currently the main regulation aimed at protecting water from nitrate accumulation due to farming operations. Due to this directive, nitrate vulnerable zones (NVZs) have been set with strict regulations regarding the timing and rates of nitrogen application in these zones. In the NVZs, a specific threshold limits the application rate to 170 kg ha -1 y -1 for nitrogen. However, this threshold is normally 340 kg ha From a technology perspective, strict compliance with these limits can be achieved using control systems that use "variable rate technology" (VRT) for spreading fertilizer. These systems are generally classified into four groups that correspond to the following increasing automation levels adapted from Funk and Robert, (2003).• Automation level 0: This system uses a constant-flow rate distribution and requires devices to deliver a predefined rate of effluent regardless of the operating conditions. The authors are Aldo Calcante, Assistant Professor, Roberto Oberti, Assistant Professor, Università degli Studi di Milano, Department of Agricultural and Environmental Sciences, Milan, Italy; Massimo Brambilla, Researcher, and Carlo Bisaglia, Senior Researcher, Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria

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Section: Resultssupporting

confidence: 91%

A Retrofit Variable-Rate Control System for Pressurized Slurry Tankers

2015

Appl. Eng. Agric.

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“…The analyzed sample is characterized by well-formed crystallographic phases. The presence of the struvite crystallographic phase is clearly evidenced by a series of characteristic diffraction lines with the highest intensities at 2θ 15 The applied X-ray Diffraction (XRD) analysis allowed for the determination of the type of crystalline phases occurring in the sample (Figure 3). The analyzed sample is characterized by well-formed crystallographic phases.…”

Section: Resultsmentioning

confidence: 99%

“…The analyzed sample is characterized by well-formed crystallographic phases. The presence of the struvite crystallographic phase is clearly evidenced by a series of characteristic diffraction lines with the highest intensities at 2θ 15 Figure 3. X-ray diffraction pattern of the product from the bio-refinery with struvite (STR) evidence: struvite (MgNH4PO4 .…”

Section: Resultsmentioning

confidence: 99%

“…This allows for obtaining additional income from the sale of the obtained product [13]. It is possible to apply several technologies of the digestate liquid fraction processing, such as struvite precipitation, ammonia stripping, evaporation, or membrane separation, resulting in the nutrient recovery and production of nutrient-rich products [14][15][16][17]. Struvite precipitation and ammonia stripping are promising methods for recovering the nitrogen and phosphorus from the liquid fractions of digestate.…”

Section: Introductionmentioning

confidence: 99%

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A Bio-Refinery Concept for N and P Recovery—A Chance for Biogas Plant Development

et al. 2019

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Biogas is an alternative source of energy for fossil fuels. In the process of transforming organic materials into biogas significant amounts of valuable digestate are produced. In order to make the whole process sustainable digestate should be utilized this is a constraining factor in the development of the biogas industry. Consequently, there is an on-going search for new technologies to process digestate, allowing to broaden the range of possible ways of digestate utilization. One of such possibilities is technology of nitrogen (N) and phosphorus (P) recovery from the anaerobic digestate. In this study results of physicochemical analysis of materials flowing through the farm-scale bio-refinery producing struvite (STR) and ammonium sulphate (AS) are presented. Struvite was precipitated from the liquid fraction of digestate (LFDS). Ammonia was bound by sulphuric acid resulting in obtaining ammonium sulphate. The STR obtained was of medium purity and contained other macronutrients and micronutrients that further enhanced its agronomic value. The P recovery effectiveness, counted as the difference between the Ptot content in the material before and after STR precipitation was 43.8%. The AS was characterized by relatively low Ntot and Stot content. The Ntot recovery efficiency reached 43.2%. The study showed that struvite precipitation and ammonia stripping technologies can be used for processing digestate however, the processes efficiency should be improved.

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“…The predominant components in effluent of evaporation plants are volatile, sometimes chlorinated organics and ammonium. Often it is necessary additional treatment steps (Boopathy et al 2013;Chiumenti et al 2013). …”

Section: Biological Treatment + Chemical Oxidation (O 3 + Uv) + Ultramentioning

confidence: 99%

Hybrid method for selection of the optimal process of leachate treatment in waste treatment and valorization plants or landfills

Martin-Utrillas

Reyes-Medina

Curiel-Esparza

et al. 2014

Clean Techn Environ Policy

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Martín Utrillas, MG.; Reyes Medina, M.; Curiel Esparza, J.; Cantó Perelló, J. (2015). Hybrid method for selection of the optimal process of leachate treatment in waste treatment and valorization plants or landfills. Clean Technologies and Environmental Policy. 17(4):873-885. doi:10.1007/s10098-014-0834-4. 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 ABSTRACT Leachate from landfill waste plants is a very complex and highly contaminated liquid. In its composition we find dissolved organic matter, inorganic salts, heavy metals and other xenobiotic organic compounds, so it can be toxic, carcinogenic and capable of inducing a potential risk to biota and humans. European law does not allow such leachate to leave the premises without being depurated. There are many procedures that enable debugging, always combining different techniques. Choosing the best method to use in each case is a complex decision, as it depends on many tangible and intangible factors that must be weighed to achieve a balance between technical, cost, and environmental sustainability. We present a hybrid method for choosing the optimal combination of techniques to apply in each case, by combining a multi-criteria hierarchical analysis based on expert data obtained by the Delphi method with an analysis by the method of VIKOR to reach a consensus solution.Manuscript Click here to download Manuscript: Manuscript.docx 1 2 3 4 5 6 7 8

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Treatment of digestate from a co-digestion biogas plant by means of vacuum evaporation: Tests for process optimization and environmental sustainability

Cited by 57 publications

References 8 publications

A Retrofit Variable-Rate Control System for Pressurized Slurry Tankers

A Retrofit Variable-Rate Control System for Pressurized Slurry Tankers

A Bio-Refinery Concept for N and P Recovery—A Chance for Biogas Plant Development

Hybrid method for selection of the optimal process of leachate treatment in waste treatment and valorization plants or landfills

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