Process
Biotechnology |
|
Environmental Biotechnology |
| Electronic Journal of Biotechnology ISSN: 0717-3458 |
Vol.
12 No. 2, Issue of April 15, 2009 |
| © 2009 by Pontificia Universidad Católica
de Valparaíso -- Chile |
Received May 30, 2008 / Accepted November 3, 2008 |
| DOI: 10.2225/vol12-issue2-fulltext-9 |
|
Aerobic
removal of stigmasterol contained in kraft mill effluents
Soledad Chamorro
Grupo de Biotecnología Ambiental
Centro de Ciencias Ambientales
Universidad de Concepción
P.O. Box 160- C, Concepción, Chile
Fax: 56 41 2207076
Claudia Regina Xavier
Grupo de Biotecnología Ambiental
Centro de Ciencias Ambientales
Universidad de Concepción
P.O. Box 160- C, Concepción, Chile
Fax: 56 41 2207076
Victor Hernández
Laboratorio
de Química de Productos Naturales
Facultad de Ciencias Naturales y Oceanográficas
Universidad de Concepción
P.O. Box 160-C, Concepción, Chile
José Becerra
Laboratorio
de Química de Productos Naturales
Facultad de Ciencias Naturales y Oceanográficas
Universidad de Concepción
P.O. Box 160-C, Concepción, Chile
Gladys Vidal*
Grupo de Biotecnología Ambiental
Centro de Ciencias Ambientales
Universidad de Concepción
P.O. Box 160- C, Concepción, Chile
Tel: 56 41 2204067
Fax: 56 41 2207076
E-mail: glvidal@udec.cl
*Corresponding author
Keywords: aerated lagoon, kraft mill effluent, stigmasterol.
Abbreviations: |
AL:
aerated lagoon
BOD:
biological oxygen demand
COD:
chemical oxygen demand
EDC:
endocrine disrupting chemicals
HRT: hydraulic retention time
OLR: organic load rates
SLR: stigmasterol load rates
TSS: total suspended solid
VSS: volatile suspended solid |
Kraft mill effluent, due to its organic
matter content and acute toxicity, must be treated. A primary treatment followed
by a secondary treatment is the most common system. Aerated lagoon is also considered
an effective biological treatment, although this technology has some drawbacks related
with operation parameters and land extension space. Moreover, the recovery efficiency
for micropollutants contained in kraft mill effluent is questioned due to the
anoxic zone in the system. The goal of this work is to evaluate the performance
of the aerated lagoon to remove stigmasterol contained in kraft mill effluents.
Kraft mill effluent was treated by an aerated lagoon (AL), which was operated
with three different stigmasterol load rates (SLR = 0.2, 0.6 and 1.1 mg/L×d) and a hydraulic retention time of 1 day. The AL’s
maximum Chemical Oxygen Demand (COD) removal was 65%, whereas the Biological
Oxygen Demand (BOD5) was around 95%. The removal efficiency of
stigmasterol removal was 96% when SLR 1.1 mg/L×d, although an accumulation of stigmasterol was detected for lower SLR.
|
