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Nutrient recovery and fractionation of anaerobic digester effluents employing pilot scale membrane technology

Myrto-Panagiota Zacharof, Stephen J. Mandale, Darren Oatley-Radcliffe Orcid Logo, Robert Lovitt

Journal of Water Process Engineering, Volume: 31, Start page: 100846

Swansea University Authors: Darren Oatley-Radcliffe Orcid Logo, Robert Lovitt

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DOI (Published version): 10.1016/j.jwpe.2019.100846

Abstract

Anaerobic Digester (AD) waste, known as digestate (spent anaerobically digested effluents) of agricultural origin, was collected for a feasibility study on the use of membrane filtration to fractionate phosphate and ammonia from digestate into nutrient streams. The digestate was pre-treated to remov...

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Published in: Journal of Water Process Engineering
ISSN: 2214-7144
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50288
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Abstract: Anaerobic Digester (AD) waste, known as digestate (spent anaerobically digested effluents) of agricultural origin, was collected for a feasibility study on the use of membrane filtration to fractionate phosphate and ammonia from digestate into nutrient streams. The digestate was pre-treated to remove bulk solids and then filtered using diafiltration (DF) with ultrafiltration (UF) (5.65 psi TMP) and then nanofiltration (NF) (operating pressure 253.82 psi). Having set the pre-treated effluents at pH 4.0, retention of phosphate reached 6.78 mmols L−1 during UF with lower values being achieved with repeated DF steps. In contrast, nitrogen retention was lower at 8.21 mmols L-1 and was continuously dropping at each DF step. During NF phosphorus was shown to be strongly retained by the membrane at 31.8 mmols L−1, while retention of ammonium was low at 13.4 mmols L-1 demonstrating the potential for this combination of membrane types for fractionating high value components from AD waste.
Keywords: Sludge, NF, UF, Phosphate, Nitrogen, AD
College: Faculty of Science and Engineering
Start Page: 100846

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