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Toxics
Special Issues
Biodegradation and Removal of Environmental Pollutants by Emerging Technologies
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Biodegradation and Removal of Environmental Pollutants by Emerging Technologies

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Toxicity Reduction and Environmental Remediation".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 5691

Special Issue Editors

Dr. Katarzyna Kucharzyk

E-Mail Website
Guest Editor
Battelle Memorial Institute, 505 King Avenue, Columbus, OH 43201, USA
Interests: bioremediation; biological destruction of polymers and emerging contaminants; molecular diagnostics; proteomics
Dr. Fadime Kara Murdoch

E-Mail Website
Guest Editor
Battelle Memorial Institute, 505 King Avenue, Columbus, OH 43201, USA
Interests: molecular diagnostics; qPCR; reductive dechlorination; bioremediation; biodegradation of plastic polymers

Special Issue Information

Dear Colleagues,

The Special Issue entitled “Biodegradation and Removal of Environmental Pollutants by Emerging Technologies” focuses on the biotransformation, mineralization, detoxification, recycling, amelioration and treatment of chemicals or waste materials by naturally occurring microbial strains, microbial associations or recombinant organisms. Invited manuscripts will cover a range of topics, including the biochemistry of biodegradative pathways; genetics of biodegradative organisms and development of recombinant biodegrading organisms; molecular biology-based studies of biodegradative microbial communities; and the enhancement of naturally occurring biodegradative properties and activities. The issue will also feature novel applications of biodegradation and biotransformation technology to soil, water, sewage, heavy metals and radionuclides, organohalogens, high-COD wastes, straight-, branched-chain and aromatic hydrocarbons; coverage extends to the design and scaling up of laboratory processes and bioreactor systems. In this Special Issue, original research articles and reviews are welcome.

Dr. Katarzyna Kucharzyk
Dr. Fadime Kara Murdoch
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Toxics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • biodegradation
  • microorganism
  • pathway
  • biotransformation
  • omics
  • mineralization
  • recycling

Published Papers (2 papers)

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Research

14 pages, 2510 KiB  
Article
Biodeterioration of Microplastics by Bacteria Isolated from Mangrove Sediment
by Shu-Yan Ren and Hong-Gang Ni
Toxics 2023, 11(5), 432; https://doi.org/10.3390/toxics11050432 - 5 May 2023
Cited by 6 | Viewed by 2578
Abstract
As a kind of ubiquitous emerging pollutant, microplastics (MPs) are persistent in the environment and have a large impact on the ecosystem. Fortunately, some microorganisms in the natural environment can degrade these persistent MPs without creating secondary pollution. In this study, 11 different [...] Read more.
As a kind of ubiquitous emerging pollutant, microplastics (MPs) are persistent in the environment and have a large impact on the ecosystem. Fortunately, some microorganisms in the natural environment can degrade these persistent MPs without creating secondary pollution. In this study, 11 different MPs were selected as carbon sources to screen the microorganisms for degradable MPs and explore the possible mechanism of degradation. After repeated domestication, a relatively stable microbial community was obtained after approximately 30 days later. At this time, the biomass of the medium ranged from 88 to 699 mg/L. The growth of bacteria with different MPs ranged from 0.030 to 0.090 optical density (OD) 600 of the first generation to 0.009–0.081 OD 600 of the third generation. The weight loss method was used to determine the biodegradation ratios of different MPs. The mass losses of polyhydroxybutyrate (PHB), polyethylene (PE), and polyhydroxyalkanoate (PHA) were relatively large, at 13.4%, 13.0%, and 12.7%, respectively; these figures for polyvinyl chloride (PVC) and polystyrene (PS) were relatively slight, 8.90% and 9.10%, respectively. The degradation half-life (t1/2) of 11 kinds of MPs ranges from 67 to 116 days. Among the mixed strains, Pseudomonas sp., Pandoraea sp., and Dyella sp. grew well. The possible degradation mechanism is that such microbial aggregates can adhere to the surface of MPs and form complex biofilms, secrete extracellular and intracellular enzymes, etc., break the hydrolyzable chemical bonds or ends of molecular chains by attacking the plastic molecular chains, and produce monomers, dimers, and other oligomers, leading to the reduction of the molecular weight of the plastic itself. Full article
(This article belongs to the Special Issue Biodegradation and Removal of Environmental Pollutants by Emerging Technologies)
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21 pages, 6947 KiB  
Article
Bicarbonate-Hydrogen Peroxide System for Treating Dyeing Wastewater: Degradation of Organic Pollutants and Color Removal
by Néstor A. Urbina-Suarez, Christian Rivera-Caicedo, Ángel Darío González-Delgado, Andrés F. Barajas-Solano and Fiderman Machuca-Martínez
Toxics 2023, 11(4), 366; https://doi.org/10.3390/toxics11040366 - 11 Apr 2023
Cited by 6 | Viewed by 2475
Abstract
The textile industry is a global economic driving force; however, it is also one of the most polluting industries, with highly toxic effluents which are complex to treat due to the recalcitrant nature of some compounds present in these effluents. This research focuses [...] Read more.
The textile industry is a global economic driving force; however, it is also one of the most polluting industries, with highly toxic effluents which are complex to treat due to the recalcitrant nature of some compounds present in these effluents. This research focuses on the removal of Chemical Oxygen Demand (COD), color, Total Organic Carbon (TOC), and Ammoniacal Nitrogen (N-NH3) on tannery wastewater treatment through an advanced oxidation process (AOPs) using sodium bicarbonate (NaHCO3), hydrogen peroxide (H2O2) and temperature using a central composite non-factorial design with a surface response using Statistica 7.0 software. All experiments used a 500 mL reactor with 300 mL of tannery wastewater from a company in Cúcuta, Colombia. The physicochemical characterization was done to determine the significant absorbance peaks about the color in the wavelengths between 297 and 669 nm. Statistical analysis found that the concentration of NaHCO3 affects the removal of color and N-NH3; however, it did not affect COD and TOC. The optimal process conditions for removing the different compounds under study were: NaHCO3 1 M, H2O2 2 M, and 60 °C, with efficiencies of 92.35%, 31.93%, 68.85%, and 35.5% N-NH3, COD, color, and TOC respectively. It can be concluded that AOPs using H2O2 and NaHCO3 are recommended to remove color and N-NH3. Full article
(This article belongs to the Special Issue Biodegradation and Removal of Environmental Pollutants by Emerging Technologies)
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