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Water Science & Technology—WST Vol 61 No 1 pp 199–205 © IWA Publishing 2010 doi:10.2166/wst.2010.794 Toxicity and recalcitrant compound removal from bleaching pulp plant effluents by an integrated system: anaerobic packed-bed bioreactor and ozoneT. R. Chaparro, C. M. Botta and E. C. PiresDepartment of Hydraulic and Sanitary Engineering, Sao Carlos School of Engineering, University of Sao Paulo, Av Trabalhador Sao Carlense 400, Sao Carlos SP, Brazil E-mail: tatianna@sc.usp.br; ecpires@sc.usp.brDepartment of Hydraulic and Sanitary Engineering, Center of Water Resources and Applied Ecology—CRHEA, Sao Carlos School of Engineering, University of Sao Paulo, Sao Carlos SP, Brazil E-mail: claricebotta@gmail.com ABSTRACT Effluents originated in cellulose pulp manufacturing processes are usually toxic and recalcitrant, specially the bleaching effluents, which exhibit high contents of aromatic compounds (e.g. residual lignin derivates). Although biological processes are normally used, their efficiency for the removal of toxic lignin derivates is low. The toxicity and recalcitrance of a bleached Kraft pulp mill were assessed through bioassays and ultraviolet absorption measurements, i.e. acid soluble lignin (ASL), UV280, and specific ultraviolet absorption (SUVA), before and after treatment by an integrated system comprised of an anaerobic packed-bed bioreactor and oxidation step with ozone. Furthermore, adsorbable organic halides (AOX) were measured. The results demonstrated not only that the toxic recalcitrant compounds can be removed successfully using integrated system, but also the ultraviolet absorption measurements can be an interesting control-parameter in a wastewater treatment. Keywords: acid soluble lignin; AOX; eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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