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3 results on '"Emeline Melchiors"'

1. Microbial community evolution in the biofilm attached to sponge carriers in pulp mill effluent treatment

Author

Emeline Melchiors, Camila Peitz, Jackeline Valendolf-Nunes, Mac Wendell Barbosa da Silva, Izadora Cervelin-Flôr, Vânia Aparecida-Vicente, and Claudia Regina Xavier

Subjects
Bioreactors, Moving Bed Biofilm Reactor, Industrial effluent, Wastewater treatment, Gene sequencing, Engineering (General). Civil engineering (General), TA1-2040
Abstract

This study investigates the evolution of the biofilm matrix responsible for treating effluent from a pulp mill and identifies the microbial community by 16S rRNA gene sequencing. In addition, a biocarrier promising a functional structure with better specific features for biofilm formation than traditional polyurethane carriers was explored. The average removal efficiencies were 43.7% for chemical oxygen demand (COD) and 62.7% for biochemical oxygen demand (BOD5). The color increased during the treatment, indicating anoxic zones being formed in the inner part of this type of carrier. Periodic micrographs showed the evolution of extracellular polymeric substances and materials like fungi and bacteria adhered to the carriers. Genetic sequencing confirmed the presence of Bacillus sp. and Paenibacillus glucanolyticus, species with the potential to degrade and discolor pulp industrial effluents. Results offer a potential basis to enhance treatment facilities of pulp and paper mills based on microbial activities.

Published
2024
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3. Pulp and Paper Mill Effluent Treated by Combining Coagulation-Flocculation-Sedimentation and Fenton Processes

Author

Sérgio Henrique Saavedra Martinelli, Emeline Melchiors, Claudia Regina Xavier, Marco Antonio de Andrade, Alexandre Renato dos Santos, Luiz Henrique Schroeder, Kethlyn Ghellere Moscon, and Mariana Grötzner

Subjects
0106 biological sciences, Biochemical oxygen demand, chemistry.chemical_classification, Flocculation, Environmental Engineering, Chemistry, business.industry, Ecological Modeling, Pulp (paper), Advanced oxidation process, Chemical oxygen demand, Paper mill, 010501 environmental sciences, engineering.material, Pulp and paper industry, 01 natural sciences, Pollution, 010608 biotechnology, engineering, Environmental Chemistry, Organic matter, business, Effluent, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Pulp and paper industries face serious environmental challenges, especially with regard to the conservation of water resources. Chemical thermal mechanical pulping (CTMP) is a process of pulping that combines chemical and mechanical pulping. This reduces the volume of water used in the process. But on the other hand, CTMP generates an effluent with high concentration of organic matter and is difficult to treat. This study evaluated the efficiency in the combination of physicochemical pretreatment by coagulation-flocculation-sedimentation (CFS) process and advanced oxidation process (AOP) by Fenton in sequence to treat CTMP effluent of a Brazilian industry. At first, the best treatment conditions for this type of effluent were determined. To evaluate the efficiency, pH, chemical oxygen demand, biochemical oxygen demand, total organic carbon, lignin contents, color, total phenolic contents, turbidity, and solids were measured before and after treatment. The acute toxicity on Daphnia magna was also determined. The treatment with CFS showed better results in the removal of solids and Fenton in the removal of recalcitrant compounds, such as lignin, demonstrating the need to use them in sequence. Combining CFS and Fenton to treat CTMP effluent allowed to achieve a removal efficiency of 95% for TOC, 61% for COD, and 76% for lignin contents.

Published
2018
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