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Energies 2019, 12(1), 155; https://doi.org/10.3390/en12010155

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

1
Department of Soil Environment Sciences, Warsaw University of Life Sciences–SGGW, Nowoursynowska 159, 02–776 Warsaw, Poland
2
Department of Economics and Organisation of Enterprises, Warsaw University of Life Sciences—SGGW, Nowoursynowska 166, 02–787 Warsaw, Poland
3
Cornelissen Consulting Services BV, Binnensingel 3, 7411 PL Deventer, The Netherlands
4
New Chemical Syntheses Institute, Al. Tysiąclecia P.P. 13a, 24–110 Pulawy, Poland
*
Author to whom correspondence should be addressed.
Received: 1 December 2018 / Revised: 20 December 2018 / Accepted: 31 December 2018 / Published: 2 January 2019
(This article belongs to the Special Issue Production and Utilization of Biogas)
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Abstract

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. View Full-Text
Keywords: biogas plant; struvite precipitation; ammonia stripping; circular bioeconomy; digestate treatment biogas plant; struvite precipitation; ammonia stripping; circular bioeconomy; digestate treatment
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Szymańska, M.; Szara, E.; Sosulski, T.; Wąs, A.; Van Pruissen, G.W.P.; Cornelissen, R.L.; Borowik, M.; Konkol, M. A Bio-Refinery Concept for N and P Recovery—A Chance for Biogas Plant Development. Energies 2019, 12, 155.

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