AOX degradation of the pulp and paper industry bleaching wastewater using nZVI in two different agitation processes

Erhardt, Camila Stockey; Basegio, Tania Maria; Capela, Isabel; Rodríguez, Adriane Lawisch; Machado, Ênio Leandro; López, Diosnel Antonio Rodríguez; Tarelho, Luís António da Cruz; Bergmann, Carlos Pérez

doi:10.1016/j.eti.2021.101420

Cited by 11 publications

(7 citation statements)

References 46 publications

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“…The chlorinated replacement of the lignin benzene ring occurred. This is the key to the generation of organic pollutants during the chlorine dioxide oxidation of pulp [ 36 ]. Thus, the efficient and clean oxidation of chlorine dioxide was impeded.…”

Section: Resultsmentioning

confidence: 99%

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

Liu

Deng

Liang

et al. 2022

IJMS

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Chlorine dioxide is widely used for pulp bleaching because of its high delignification selectivity. However, efficient and clean chlorine dioxide bleaching is limited by the complexity of the lignin structure. Herein, the oxidation reactions of phenolic (vanillyl alcohol) and non-phenolic (veratryl alcohol) lignin model species were modulated using chlorine dioxide. The effects of chlorine dioxide concentration, reaction temperature, and reaction time on the consumption rate of the model species were also investigated. The optimal consumption rate for the phenolic species was obtained at a chlorine dioxide concentration of 30 mmol·L−1, a reaction temperature of 40 °C, and a reaction time of 10 min, resulting in the consumption of 96.3% of vanillyl alcohol. Its consumption remained essentially unchanged compared with that of traditional chlorine dioxide oxidation. However, the consumption rate of veratryl alcohol was significantly reduced from 78.0% to 17.3%. Additionally, the production of chlorobenzene via the chlorine dioxide oxidation of veratryl alcohol was inhibited. The structural changes in lignin before and after different treatments were analyzed. The overall structure of lignin remained stable during the optimization of the chlorine dioxide oxidation treatment. The signal intensities of several phenolic units were reduced. The effects of the selective oxidation of lignin by chlorine dioxide on the pulp properties were analyzed. Pulp viscosity significantly increased owing to the preferential oxidation of phenolic lignin by chlorine dioxide. The pollution load of bleached effluent was considerably reduced at similar pulp brightness levels. This study provides a new approach to chlorine dioxide bleaching. An efficient and clean bleaching process of the pulp was developed.

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Section: Resultsmentioning

confidence: 99%

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

Liu

Deng

Liang

et al. 2022

IJMS

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“…The primary pulp manufacturing and paper‐making operations are classified into mechanical, chemical, chemo‐mechanical, thermo‐mechanical pulping, and paper‐making. However, one of the main concerns with the paper industry is high water consumption, requiring approximately 70 m 3 of water per metric ton of paper produced, while about 70 % of this water is processed 2, 3. Recirculating the water resulted in reducing the freshwater intake and thus improving the economy of the process and maintaining environmental entities such as the health of human beings, water bodies, soil, and air that are typically affected by industrial activities 4, 5.…”

Section: Introductionmentioning

confidence: 99%

“…The utilization of freshwater can further be reduced up to 95 % per ton of paper via the use of modern processing techniques, such as biological treatments using membrane bioreactor and sequencing batch bioreactor, supercritical water oxidation and supercritical water gasification, micro electrolysis, and membrane separation technology, etc. 3, 6. Generally, the quantity of freshwater needed depends on the buildup of pollutants in the process water, which can reduce the processing efficiency 2.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation in Pulp and Paper Industry Wastewater Treatment: A Bibliometric Analysis

Athar,

Nawaz,

Nadeem

et al. 2023

ChemBioEng Reviews

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The pulp and paper industry is one of the most significant industrial water polluters, generating large volumes of wastewater with high levels of organic pollutants, suspended solids, and other contaminants. Catalytic ozonation has emerged as a promising technique for the treatment of pulp and paper industry wastewater. Numerous reviews have presented the research on catalytic ozonation; however, open literature is missing a bibliometric analysis. Therefore, this article presents a bibliometric analysis of the research available on catalytic ozonation in pulp and paper industry wastewater treatment. A total of 578 documents extracted from the Scopus database have been examined via VOSviewer, MS Excel, and Rstudio to identify the research trends, influential authors, and research institutions in the field. The results reveal that the number of publications on the topic has increased significantly in recent years. This study also identified several influential authors, institutions, and highlighted future research directions in the field. Overall, the study provides insights into the state of research on catalytic ozonation in pulp and paper industry wastewater treatment and could help guide future research efforts in this area.

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“…[8][9] Since wastewater comes from different strata, wastewater will also be produced in different processes, resulting in very complex composition of wastewater, including oil substances, solid suspensions, chemicals, and polymers for oil displacement. [10][11][12] At present, many oilfields still use chemical and physical methods to treat wastewater. [13] Physical methods such as flocculation and precipitation will not cause secondary pollution to the environment, but the single physical method takes a long time to treat wastewater and occupies a large space.…”

Section: Introductionmentioning

confidence: 99%

“…[ 8–9 ] Since wastewater comes from different strata, wastewater will also be produced in different processes, resulting in very complex composition of wastewater, including oil substances, solid suspensions, chemicals, and polymers for oil displacement. [ 10–12 ]…”

Section: Introductionmentioning

confidence: 99%

Synthesis and study of new nonionic polyether water clarifier for oily wastewater

et al. 2022

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In order to solve the problem of oily wastewater treatment in Shengli Oilfield, tertbutyl phenol (TP) series nonionic polyether water clarifiers were synthesized by polymerization with p-tert-butyl phenol (PTBP) as the initiator. The water clarifiers were characterized by Fourier-transform infrared spectroscopy (FT-IR) and the interfacial tension test was carried out. The TP series of water clarifiers effect were evaluated by the oil content and suspension content in the clean water experiments. In addition, the effects of dosage and temperature on the water effect were discussed through the control variable method. The experimental results showed that the oil removal rate of TP6 can reach 95% and the suspension removal rate can reach 92% when the dosage of water clarifier was 40 mg/L, the cleaning water temperature was 55 C, and the cleaning water time was 30 min. The oily wastewater colour after cleaning was clear and transparent with the TP series of water clarifiers, and the effect was better than with commercial water clarifiers.

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AOX degradation of the pulp and paper industry bleaching wastewater using nZVI in two different agitation processes

Cited by 11 publications

References 46 publications

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

Catalytic Ozonation in Pulp and Paper Industry Wastewater Treatment: A Bibliometric Analysis

Synthesis and study of new nonionic polyether water clarifier for oily wastewater

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