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|Title: ||Decolourisation of a pulp mill effluent using commercial activated carbons|
|Authors: ||Valente Nabais, Joao|
|Keywords: ||activated carbons|
|Issue Date: ||2006|
|Publisher: ||The British Carbon Group|
|Citation: ||J. Valente Nabais, P.J.M. Carrott, M.M.L. Ribeiro Carrott, Liliana Marques, “Decolourisation of a pulp mill effluent using commercial activated carbons”, Carbon 2006 (Malcolm Heggie, Edt.) The British Carbon Group, Aberdeen (2006), Short Abstract pag 310, Extented Abstract (Edição em CD-room) pag 310-315.|
|Abstract: ||The decolourisation of industry effluents is a challenging and fundamental task related to pollution
control, mainly in pulp mill and textile industries. The dark colour of the pulp mill effluent, depending
on the river characteristics, can lead to the reduction of the light penetration into the aquatic
environment with the consequent decrease of photosynthesis and aquatic life destruction. Also, the
lignocelulosic material deposited on the margins and river bed can lead to a large depletion of the
dissolved oxygen with the creation of anaerobic conditions that can give rise to the death of aquatic
organisms (Ali, 2001).
The chemical composition of the pulp mill effluent (referred as effluent) is very complex.
Nevertheless, we can say that the lignin and tannin compounds are the main causes for the effluent´s
dark brown colour. Among these compounds we can find hidroxyphenyl, siringyl and guaiacyl
complexes (Mohan, 1997). These compounds are chemically stable, resistant to biodegradation and
extremely difficult to separate by most methods in cost effective processes, such as membrane
adsorption (Mutlu, 2002), cationic coagulants, ultrafiltration (Mutlu, 2002) and chemical oxidation
(Malik, 2004). One of the most promising methods is the use of activated carbons for the removal
of the effluent colour.
In this work the use of 5 commercial activated samples with different shapes, origins and
characteristics were tested for the decolourisation of a pulp mill effluent collected directly on the
effluent discharge of a plant situated in Setúbal, Portugal, property of Portucel. The colour
adsorption was done using batch and dynamic trials.|
|Appears in Collections:||CQE - Artigos em Livros de Actas/Proceedings|
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