Nanofiltration for the recovery of phosphorus — Development of a mass transport model

Nanofiltration is a possible separation technology for phosphorus recycling from sewage sludge or sewage sludge ash. Nanofiltration can be applied for this purpose in combination with a low pressure wet oxidation or acidic hydrolysis of sewage sludge or leaching of sewage sludge ash. The feed of the...

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Bibliographic Details
Published in:Desalination 2014-08, Vol.346, p.70-78
Main Authors: Niewersch, Claudia, Battaglia Bloch, A.L., Yüce, Süleyman, Melin, Thomas, Wessling, Matthias
Format: Article
Language:English
Subjects:
Applied sciences
Ashes
Chemical engineering
Exact sciences and technology
Heat and mass transfer. Packings, plates
Mass transport modelling
Mathematical models
Membrane separation (reverse osmosis, dialysis...)
Nanofiltration
Other industrial wastes. Sewage sludge
Permeability
Phosphorus
Phosphorus recovery
Pollution
Reactors
Sewage sludge
Transport
Wastes
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Summary:Nanofiltration is a possible separation technology for phosphorus recycling from sewage sludge or sewage sludge ash. Nanofiltration can be applied for this purpose in combination with a low pressure wet oxidation or acidic hydrolysis of sewage sludge or leaching of sewage sludge ash. The feed of the nanofiltration in this application is in the pH range of 1.5 to 3 and contains phosphoric acid, sulphuric acid as well as metal ions which should be rejected. This paper presents experimental data and multi-ion transport modelling. The model is based on the solution diffusion model with permeability coefficients as the only input parameters. For several simplified synthetic solutions permeability coefficients could be successfully fitted. By interpolation of the parameters as functions of pH and concentration in the nanofiltration feed, retentions could be calculated for additional compositions. A validation with real solutions obtained from sewage sludge was performed. •Modelling approach for nanofiltration and mixtures of acids and salts was developed.•The model was evaluated using synthetic mixtures and pre-treated sewage sludge.•A nanofiltration separation process for phosphorus recovery was evaluated.•The efficiency of the separation was analysed as function of the process conditions.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2014.05.011