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Title: Adsorption of organics in wastewater on nyex and electrochemical regeneration : development of a process
Author: Brown, N. W.
ISNI:       0000 0004 2722 1866
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2012
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The removal of low concentrations of aqueous phase organics using adsorptive techniques has traditionally used high capacity adsorbent materials, for example activated carbons. The drawback of these materials is that regeneration can be costly and complex. An alternative approach reported in this thesis involves the use of a highly conductive material, a graphite intercalation compound (GIC), as an adsorbent. This material, which has been shown to be non-porous with a low surface area, is capable of electrochemical regeneration. This electrochemical regeneration is achieved by the oxidation of the organics in the anodic compartment of a simple, divided cell. In comparison with activated carbons, it has been demonstrated that adsorption is quick, with up to 88% of equilibrium loading being achieved within 2 minutes. 100% electrochemical regeneration can be achieved in a simple divided electrochemical cell with 10 minutes treatment, by passing a charge of 25 C g-1. The efficiency of electrochemical regeneration depends on a range of variables including charge passed, current density, treatment time, electrolyte concentration and composition and the adsorbent bed thickness. Multiple adsorption and regeneration cycles indicate that there is little loss of adsorptive capacity on regeneration. Whilst a number of modes of operation are potentially possible, the m4jority of the work reported in this thesis is based on separate adsorption and electrochemical regeneration. However, some work on a process involving continuous adsorption coupled with continuous and simultaneous electrochemical regeneration is presented. A third design involving continuous adsorption and regeneration within separate zones IN a single unit is given as an area for further research.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available