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Title: Assessing the agricultural reuse of the digestate from microalgae anaerobic digestion and co-digestion with sewage sludge
Author: Solé-Bundó, Maria
Cucina, Mirko
Folch Sánchez, Montserrat
Tapias Pantebre, Josefina Carlota
Gigliotti, Giovanni
Garfí, Marianna
Ferrer, Ivet
Keywords: Microalgues
Digestió anaeròbia
Toxicologia ambiental
Llots de depuradora
Anaerobic digestion
Environmental toxicology
Sewage sludge
Issue Date: 15-May-2017
Publisher: Elsevier B.V.
Abstract: Microalgae anaerobic digestion produces biogas along with a digestate that may be reused in agriculture. However, the properties of this digestate for agricultural reuse have yet to be determined. The aim of this study was to characterise digestates from different microalgae anaerobic digestion processes (i.e. digestion of untreated microalgae, thermally pretreated microalgae and thermally pretreated microalgae in co-digestion with primary sludge). The main parameters evaluated were organic matter, macronutrients and heavy metals content, hygenisation, potential phytotoxicity and organic matter stabilisation. According to the results, all microalgae digestates presented suitable organic matter and macronutrients, especially organic and ammonium nitrogen, for agricultural soils amendment. However, the thermally pretreated microalgae digestate was the least stabilised digestate in comparison with untreated microalgae and co-digestion digestates. In vivo bioassays demonstrated that the digestates did not show residual phytotoxicity when properly diluted, being the co-digestion digestate the one which presented less phytotoxicity. Heavy metals contents resulted far below the threshold established by the European legislation on sludge spreading. Moreover, low presence of E. coli was observed in all digestates. Therefore, agricultural reuse of thermally pretreated microalgae and primary sludge co-digestate through irrigation emerges a suitable strategy to recycle nutrients from wastewater.
Note: Versió postprint del document publicat a:
It is part of: Science of the Total Environment, 2017, vol. 586, p. 1-9
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ISSN: 0048-9697
Appears in Collections:Articles publicats en revistes (Biologia, Sanitat i Medi Ambient)

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