dc.contributor.advisor |
Jarvis, Peter |
|
dc.contributor.advisor |
Judd, Simon J. |
|
dc.contributor.author |
Keeley, James |
|
dc.date.accessioned |
2015-06-01T14:19:23Z |
|
dc.date.available |
2015-06-01T14:19:23Z |
|
dc.date.issued |
2014-10 |
|
dc.identifier.uri |
http://dspace.lib.cranfield.ac.uk/handle/1826/9218 |
|
dc.description.abstract |
Coagulation is a ubiquitous process in the treatment of raw surface water for
eventual potable use. Despite its capabilities, the sheer scale of its use is
manifested in the volumes of chemicals it demands and waste sludge it
produces. Recovering and reusing the chemical activity of the coagulant sludge
in water treatment is a logical solution but this practice has been restricted by
the presence of contaminants within the sludge. This thesis has investigated
methods that can separate the coagulant metals from these primarily natural
organic contaminants, with an aim of producing a sufficiently pure coagulant for
effective treatment performance when reused.
A process of ultrafiltration of the impure regenerated coagulant followed by a
powdered activated carbon polishing stage compared favourably to a number of
other separation processes and was found to remove the most dissolved
organic compounds. When the purified coagulant was used to treat raw water, it
provided better turbidity removal than commercial coagulant and matched its
removal of trihalomethane precursors, making the process suitable for
consideration at full-scale. Analysis of the whole life cost suggested that such
performance could be reproduced at full-scale within a 25 year payback period.
The reuse of even purified recovered coagulants in drinking water treatment still
carries risks which may deter its implementation. Therefore the efficacy of
recovered coagulants in the role of phosphorus removal from wastewater was
also investigated. This showed that both acidified and unacidified waterworks
sludges, with sufficient contact time, could remove similar levels of phosphorus
as fresh coagulants, at approximately half the whole life cost. |
en_UK |
dc.description.sponsorship |
EPSRC |
en_UK |
dc.description.sponsorship |
Severn Trent Water |
en_UK |
dc.description.sponsorship |
Anglian Water |
en_UK |
dc.description.sponsorship |
Scottish Water |
en_UK |
dc.description.sponsorship |
Northumbrian Water |
en_UK |
dc.language.iso |
en |
en_UK |
dc.publisher |
Cranfield University |
en_UK |
dc.rights |
© Cranfield University 2014. All rights reserved. No part of this
publication may be reproduced without the written permission of the
copyright owner. |
en_UK |
dc.subject |
Water treatment residual |
en_UK |
dc.subject |
ultrafiltration |
en_UK |
dc.subject |
Donnan dialysis |
en_UK |
dc.subject |
organo-metallic separation |
en_UK |
dc.subject |
phosphorus removal |
en_UK |
dc.title |
Coagulant Recovery from Waterworks Sludge |
en_UK |
dc.type |
Thesis or dissertation |
en_UK |
dc.type.qualificationlevel |
Doctoral |
en_UK |
dc.type.qualificationname |
EngD |
en_UK |