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Title:
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Karakterisering van een microfiltratie-membraaninstallatie: opzet, uitvoering en analyse van experimenten aan DWT-installatie
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Author(s):
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Published by:
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Publication date:
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ECN
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1-7-1999
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ECN report number:
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Document type:
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ECN-I--99-010
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Other
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Number of pages:
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Full text:
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136
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Download PDF
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Abstract:
Identify and implement measures to improve the energy efficiency of theoperation of a filtration process based on inorganic membranes is the
objective of the research project 'Advanced Process Control of a Membrane
Installation'. As a first step in this project, experiments were carried out
in the micro-filtration membrane installation which is used by the
Decontamination and Waste Treatment (DWT) facility of ECN/NRG (Netherlands
Energy Research Foundation/Nuclear Research and Consultancy Group) in order
to process contaminated water from laboratories and nuclear facilities.
Additional temperature and pressure sensors were installed and the data
acquisition system was extended. The fixed speed circulation pump of one
module has been replaced by a variable speed pump. The cross-flow velocity
was varied from 4.5 to 6.3 m/s and the transmembrane pressure (TMP) from 0.18
to 0.37 MPa. Practical issues relating to the control of the
permeate-retentate ratio have been clarified. The module temperature appears
to be a reliable measure for the membrane filtration efficiency.
Discrepancies between a simplified model and the experimental data require
additional attention. Preliminary results indicate that yield can be
increased by increasing the TMP without causing a detrimental compacting of
the cake on the membrane surface; the membrane resistance is virtually not
affected. The beneficial effect of an increased crossflow velocity on
membrane fouling and delayed cake formation cannot be substantiated by the
scoping experiments. The large variation in feedwater quality obscured the
experimental results, and therefore additional attention on representative
feedwater quality conditions is needed. The preliminary results indicate that
a reduction of the crossflow velocity from 6.0 m/s to 5.0 m/s can result in a
substantial increase of the energy efficiency (at least 25%) without
affecting yield. 36 refs.
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