Reuse of recovered coagulants in water treatment: An investigation on the effect coagulant purity has on treatment performance

Simple item page
dc.contributor.authorKeeley, James
dc.contributor.authorSmith, Andrea D.
dc.contributor.authorJudd, Simon J.
dc.contributor.authorJarvis, Peter
dc.date.accessioned2016-06-09T19:19:52Z
dc.date.available2016-06-09T19:19:52Z
dc.date.issued2014-04-28
dc.description.abstractCoagulant recovery offers many potential benefits to water treatment, by reducing chemical demand and waste production. The key obstacle to successful implementation is achieving the same levels of treatment quality and process economics as commercial coagulants. This study has evaluated the selectivity of pressure-filtration in the role of a low-cost coagulant recovery technology from waterworks sludge. The treatment performance of the purified recovered coagulant was directly compared to fresh and raw recovered coagulants. DOC and turbidity removal by recovered coagulants was close to that of commercial coagulants, indicating that coagulant can be successfully recovered and regenerated by acidifying waterworks sludge. However, performance was less consistent, with a much narrower optimum charge neutralisation window and 10–30% worse removal performance under optimum conditions. This inferior performance was particularly evident for recovered ferric coagulants. The impact of this was confirmed by measuring THM formation potential and residual metals concentrations, showing 30–300% higher THMFPs when recovered coagulants were used. This study confirms that pressure-filtration can be operated on an economically viable basis, in terms of mass flux and fouling. However, the selectivity currently falls short of the purity required for potable treatment, due to incomplete rejection of sludge contaminants.en_UK
dc.identifier.citationJames Keeley, Andrea D. Smith, Simon J. Judd, Peter Jarvis, Reuse of recovered coagulants in water treatment: An investigation on the effect coagulant purity has on treatment performance, Separation and Purification Technology, Volume 131, 27 June 2014, pp69-78en_UK
dc.identifier.issn1383-5866
dc.identifier.urihttp://dx.doi.org/10.1016/j.seppur.2014.04.033
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/9955
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-Non-Commercial-No Derivatives 3.0 Unported (CC BY-NC-ND 3.0). You are free to: Share — copy and redistribute the material in any medium or format. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: Non-Commercial — You may not use the material for commercial purposes. No Derivatives — If you remix, transform, or build upon the material, you may not distribute the modified material. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.subjectCoagulant recoveryen_UK
dc.subjectWater treatment residualsen_UK
dc.subjectWaterworks sludgeen_UK
dc.subjectUltrafiltrationen_UK
dc.subjectAlum recoveryen_UK
dc.titleReuse of recovered coagulants in water treatment: An investigation on the effect coagulant purity has on treatment performanceen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Reuse_of_Recovered_Coagulants_in_Water_Treatment-2014.pdf
Size:
1.02 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.79 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)