Imperial College London
Dr Geoff Fowler

DrGeoffFowler

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 5973g.fowler

 
 
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Location

 

413Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Larasati:2021:10.1016/j.chemosphere.2021.131888,
author = {Larasati, A and Fowler, GD and Graham, NJD},
doi = {10.1016/j.chemosphere.2021.131888},
journal = {Chemosphere},
pages = {1--10},
title = {Extending granular activated carbon (GAC) bed life: A column study of in-situ chemical regeneration of pesticide loaded activated carbon for water treatment.},
url = {http://dx.doi.org/10.1016/j.chemosphere.2021.131888},
volume = {286},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In-situ chemical regeneration of granular activated carbon (GAC) may represent an advantageous alternative to conventional off-site thermal regeneration in water treatment applications. The performance of chemical regeneration of carbon exhausted by metaldehyde and isoproturon was investigated using rapid small-scale column tests, performed using a sequence of pesticide adsorption and chemical regeneration cycles with a novel alkaline-organic regenerant solution. A fresh regenerant solution was able to achieve 82% and 45% regeneration of carbon exhausted by metaldehyde and isoproturon, respectively. After the first regeneration, the performance declined slightly to 79%, and to 36% after the fourth regeneration. A comparison using a thermally regenerated (operational) carbon suggested that chemical regeneration was more beneficial for carbon exhausted by metaldehyde. The regenerant solution has a potential to be re-used multiple times, thereby minimizing the amount of waste chemicals generated. A series of carbon characterization tests showed that chemical regeneration did not alter the surface area, pore size distribution and surface chemistry of the carbon. As part of the evaluation, the adsorption thermodynamics of virgin and chemically regenerated carbons were determined using isothermal titration calorimetry to evaluate the adsorption behaviour of the pesticides on the carbon samples. The relatively high regeneration efficiency achieved by chemical regeneration, and minimal deleterious effect to the physico-chemical properties of the carbon, demonstrated the beneficial potential of this process as an alternative to conventional thermal regeneration of GAC.
AU  - Larasati,A
AU  - Fowler,GD
AU  - Graham,NJD
DO  - 10.1016/j.chemosphere.2021.131888
EP  - 10
PY  - 2021///
SN  - 0045-6535
SP  - 1
TI  - Extending granular activated carbon (GAC) bed life: A column study of in-situ chemical regeneration of pesticide loaded activated carbon for water treatment.
T2  - Chemosphere
UR  - http://dx.doi.org/10.1016/j.chemosphere.2021.131888
UR  - https://www.ncbi.nlm.nih.gov/pubmed/34418652
UR  - https://www.sciencedirect.com/science/article/pii/S0045653521023602?via%3Dihub
UR  - http://hdl.handle.net/10044/1/91438
VL  - 286
ER  -
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