Effects of programmed maintenance shutdowns on effluent quality of a bleached kraft pulp mill
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Nelson Rubens Nascimento Del’Antonio
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Mariele Fioreze
Abstract
Routinely, the mills perform programmed maintenance shutdowns (PMS) that can affect the characteristics of the effluents and the performance of the effluent treatment plant (ETP). A careful planning of the PMS, along with the use of industrial process sectorial spill control and the use of the emergency spill lagoon have considerably minimized these effects. The Suzano pulp mill located in Aracruz (Brazil) has three production lines and carry out, on average, PMS of each production line separately, every 15 months of operation. The purpose of the study was to evaluate the effects of the PMS on the effluent characteristics and performance of the ETP compared to the periods of normal operation. The results showed that during the PMS, the physicochemical characteristics of the raw and treated effluents were like those found during normal operation. The lower organic loads found in the effluents during the PMS periods were associated with the decrease of the flow rates and the increase of the hydraulic retention time of the ETP, causing a better performance of COD, BOD, TSS and AOX removal. A proper planning of the PMS improved the performance of the ETP and the treated effluent quality remained similar to those during the normal operating period.
Acknowledgments
The authors would like to thank Suzano S. A., the Sociedade de Investigações Florestais (SIF), IFES and the Department of Forest Engineering at UFV.
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Research ethics: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
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Articles in the same Issue
- Frontmatter
- Biorefining
- Effects of trace elements (Fe, Cu, Ni, Co and Mg) on biomethane production from paper mill wastewater
- Paper Technology
- Water-dispersible paper for packaging applications – balancing material strength and dispersibility
- Recyclable oil resistant paper with enhanced water resistance based on alkyl ketene dimer modified sodium alginate
- Coating
- Preparation and properties of a novel decorative base paper for formaldehyde-free adhesive impregnation
- The effect of carbon nanoparticles on cellulosic handsheets
- Environmental Impact
- Effects of programmed maintenance shutdowns on effluent quality of a bleached kraft pulp mill
- Carbon emissions analysis of the pulp molding industry: a comparison of dry-press and wet-press production processes
- Nanotechnology
- Effect of cellulose nanofibril concentration and diameter on the quality of bicomponent yarns
- The preparation of cellulose acetate capsules using emulsification techniques: high-shear bulk mixing and microfluidics
- Lignin
- Great potentials of lignin-based separator for Li-ion battery with electrospinning in aqueous system
- Using guaiacol as a capping agent in the hydrothermal depolymerisation of kraft lignin
- Preparation of flexible and binder-free lignin-based carbon nanofiber electrode materials by electrospinning in aqueous system
