KRAFT EFFLUENT TREATMENT BY ACTIVATED SLUDGE SYSTEMS WITH ADDED ACTIVATED CARBON AS SUPPORT MEDIUM

Main Article Content

Ketinny Camargo Castro
Claudia Regina Xavier

Abstract

Pulp mill effluents have a complex composition of substances, with a high organic load
and recalcitrant compounds that hinder treatment in commonly applied biological
systems, such as activated sludge. Thus, it is necessary to carry out studies to improve
these procedures. Therefore, this work aimed to evaluate an activated sludge system
with the addition of powdered activated carbon (PAC) as support medium for
biomass to treat kraft effluent. The reactor was operated for 110 days in 4 stages.
The first stage corresponded to activated sludge only and the others were operated
with PAC addition of 2, 4, and 6 g L-1 (stages II, III, and IV, respectively). The removal
of organic matter was greater in the steps with medium support, obtaining averages
of 55, 94 and 58% for COD, BOD5, and TOC, respectively. Specific parameters such as
color, lignin derivatives and aromatic compounds were removed in, on average, 28,
29 and 36%, respectively in the stages with the PAC. Biofilm formation was observed
on the surface of the support medium during treatment, with a higher concentration
of biomass in step IV, reaching 4,086 mg L-1 of volatile suspended solids. Overall, the
addition of PAC as a support medium in the activated sludge system has improved
treatment efficiency. However, the increase in the concentration of PAC in the reactor
did not show significant improvements, which indicates the amount of 2 g L-1 of PAC
as the best concentration applied in the activated sludge system.

Article Details

How to Cite
Castro, K., & Xavier, C. (2020). KRAFT EFFLUENT TREATMENT BY ACTIVATED SLUDGE SYSTEMS WITH ADDED ACTIVATED CARBON AS SUPPORT MEDIUM. Brazilian Journal of Environmental Sciences (Online), 55(4), 510-524. https://doi.org/10.5327/z2176-947820200652
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Articles
Author Biographies

Ketinny Camargo Castro, Universidade Tecnológica Federal do Paraná (UTFPR)

Graduated in Sanitary and Environmental Engineering from the Federal University of Mato Grosso. Master's student in the Graduate Program in Environmental Science and Technology at the Federal Technological University of Paraná, in the research line of industrial effluent treatment.

Claudia Regina Xavier, Universidade Tecnológica Federal do Paraná (UTFPR)

He holds a degree in Chemistry from the Federal University of Paraná (1996) and a master's degree in Chemistry from the Federal University of Paraná (1998). She participated in Advanced Training in Environmental Management Instruments in Hamburg- Germany (2001) and later graduated in Environmental Sciences at the University of Concepción- Chile (2006). She is currently Full Professor at the Federal Technological University of Paraná - UTFPR and advisor professor in the Graduate Program in Environmental Science and Technology. Has experience in Environmental Chemistry, focusing on Industrial Effluent Treatments, acting on the following subjects: kraft pulp effluent treatment, biodegradation and ecotoxicity.