Special Issue "Soluble Microbial Products and Perfluorinated Compounds in Wastewater Treatment"

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: 31 May 2023 | Viewed by 5233

Special Issue Editors

Dr. Cong Li
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Guest Editor
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200433, China
Interests: water treatment; endocrine disruption estrogens; water purification technologies; water analysis; drinking water quality; water chemistry; water engineering; water purification; water quality analysis
Dr. Kejia Zhang
E-Mail
Guest Editor
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Interests: water treatment; endocrine disruption; taste and odour compounds
Dr. Ailan Yan
E-Mail
Guest Editor
College of Water Resources and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Interests: water treatment; micropollutants removal in waters

Special Issue Information

Dear Colleagues,

Per- and polyfluoroalkyl substances (PFASs) are synthetic fluorinated surfactants composed of a carbon backbone and a charged functional group. Their unique chemical structure provides hydrophobic, oil repellent, high temperature resistant, and significant reduction in water surface tension properties, making them widely used in pesticides, medicines, cosmetics, clothes, inks, oil production, food packaging, electrical wiring, and fire-fighting foams. However, some studies have shown that PFASs have potential hepatotoxicity, neurotoxicity, reproductive toxicity, immunotoxicity, thyroid disruption, cardiovascular toxicity, pulmonary toxicity, and renal toxicity to organisms. Therefore, it is necessary to develop effective methods to remove or degrade PFASs.

On the global market, more than 3000 PFASs, among them perfluorooctanoic acid (PFOA), are frequently detected in various environmental matrices. A variety of technologies has been developed to remove or degrade perfluorooctanoic acid (PFOA) in water, including biodegradation, adsorption (e.g., activated carbon, porous resin, mineral materials, and carbonaceous nanomaterials), and advanced oxidation (e.g., sonochemical, electrochemical, optical induction, and fenton). Among the above methods, biodegradation is not mature, and its degradation cycle is long and incomplete, which indicates the need for further development. At present, adsorption and advanced oxidation are effective methods to degrade PFOA, but their mechanism and intermediate products are not clear. Traditional adsorbents face the problem of less adsorption capacity and difficult recovery, and the defluorination rate of advanced oxidation process is low. Therefore, this Special Issue will focus on the development of new adsorbents and the improvement of defluorination rate of advanced oxidation, and investigating their mechanisms and intermediate products.

Dr. Cong Li
Dr. Kejia Zhang
Dr. Ailan Yan
Guest Editors

Manuscript Submission Information

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Keywords

  • per- and polyfluoroalkyl substances (PFASs)
  • perfluorooctanoic acid (PFOA)
  • degradation technologies
  • adsorption
  • advanced oxidation
  • mechanism
  • defluorination rate
  • intermediate products
  • disinfection byproducts

Published Papers (6 papers)

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Review

Review
A Review of Recent Advances in Detection and Treatment Technology for Perfluorinated Compounds
Water 2022, 14(23), 3919; https://doi.org/10.3390/w14233919 - 01 Dec 2022
Viewed by 483
Abstract
Perfluorinated compounds (PFCs) are a novel type of environmental pollutant with a specific structure. PFCs have become a global concern due to their environmental persistence and biotoxicity properties. In this paper, we review the hazardous effects, detection technologies, and treatment methods of PFCs. [...] Read more.
Perfluorinated compounds (PFCs) are a novel type of environmental pollutant with a specific structure. PFCs have become a global concern due to their environmental persistence and biotoxicity properties. In this paper, we review the hazardous effects, detection technologies, and treatment methods of PFCs. We present the current status of PFCs pollution in water, the atmosphere, soil, and organisms. Moreover, we show that PFCs have toxic effects, such as hepatotoxicity, neurotoxicity, immunotoxicity, endocrine disruption, and reproductive and developmental toxicity. Six sample pretreatment techniques and four assays for PFCs are listed in this paper. This review focuses on the analysis of the treatment methods for PFCs, such as physical adsorption, microbial degradation, photochemical oxidation, electrochemical oxidation, acoustic oxidation, Fenton oxidation, and so on. We systematically analyze the treatment effects, removal mechanisms, and future directions of various technologies to provide support and suggestions for PFCs pollution control technologies. Full article
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Review
Aging Process of Microplastics in the Aquatic Environments: Aging Pathway, Characteristic Change, Compound Effect, and Environmentally Persistent Free Radicals Formation
Water 2022, 14(21), 3515; https://doi.org/10.3390/w14213515 - 02 Nov 2022
Cited by 1 | Viewed by 726
Abstract
Plastic wastes are becoming one of the most serious environmental pollutants because of their high antidegradation properties and the damage they cause to human health. More seriously, plastics can become smaller in size and form microplastics (MPs), attributing to the oxidation, weathering, and [...] Read more.
Plastic wastes are becoming one of the most serious environmental pollutants because of their high antidegradation properties and the damage they cause to human health. More seriously, plastics can become smaller in size and form microplastics (MPs), attributing to the oxidation, weathering, and fragmentation processes. The influx of MPs into water bodies seriously affects the quality of the aquatic environment. Therefore, it is necessary to summarize the aging process of MPs. In this review, we first provided an overview of the definition and source of MPs. Then we analyzed the potential aging pathways of MPs in the current aquatic environment and elaborated on the changes in the physicochemical properties of MPs during the aging process (e.g., particle size, crystallinity, thermodynamic properties, and surface functional groups). In addition, the possible synergistic contamination of MPs with other pollutants in the environment is illustrated. Finally, the mechanisms of generation and toxicity of environmental persistent free radicals (EPFRs) that may be generated during the photoaging of MPs were described, and the feasibility of using photoaged MPs as photosensitizers to catalyze photoreactive degradation of organic pollutants is proposed. Overall, this review provides a comprehensive and objective evaluation of the behavior of MPs in the aquatic environment. Full article
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Review
Review of the Distribution and Influence of Antibiotic Resistance Genes in Ballast Water
Water 2022, 14(21), 3501; https://doi.org/10.3390/w14213501 - 02 Nov 2022
Viewed by 644
Abstract
The misuse of antibiotics causes antibiotic resistance genes (ARGs) in bacteria to be gradually enriched by environmental selection, resulting in increased tolerance and resistance in bacteria to antibiotics. Ballast water is a mobile carrier for the global transfer of bacteria and genes, thus [...] Read more.
The misuse of antibiotics causes antibiotic resistance genes (ARGs) in bacteria to be gradually enriched by environmental selection, resulting in increased tolerance and resistance in bacteria to antibiotics. Ballast water is a mobile carrier for the global transfer of bacteria and genes, thus posing a certain risk of ARGs spreading into the global ocean. Therefore, it is important to investigate the current status of ARGs in ballast water, as well as control the abundance of ARGs. Herein, we attempt to comprehensively summarize the distribution and abundance of ARGs in ballast water from different sea areas and analyze the influencing factors (such as physical factors, chemical factors, temperature, pH, etc.) on the distribution of ARGs. Furthermore, we seek to review the changes in ARGs after differential disinfection technology treatment in ballast water (including chlorination, ultraviolet, ozone, and free radical technology), especially the enhancing effect of subinhibitory concentrations of disinfectants on ARGs transfer. Overall, we believe this review can serve as a guide for future researchers to establish a more reasonable standard of ballast water discharge that considers the pollution of ARGs and provide new insight into the risk of vertical and horizontal ARG transfer in ballast water after disinfection. Full article
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Review
The Effect Review of Various Biological, Physical and Chemical Methods on the Removal of Antibiotics
Water 2022, 14(19), 3138; https://doi.org/10.3390/w14193138 - 05 Oct 2022
Viewed by 806
Abstract
Antibiotics are highly effective bactericidal drugs that are widely used in human medicine, aquaculture and animal husbandry. Antibiotics enter the aquatic environment through various routes due to low metabolic levels and increased use. Not only are antibiotics inherently toxic, but the spread of [...] Read more.
Antibiotics are highly effective bactericidal drugs that are widely used in human medicine, aquaculture and animal husbandry. Antibiotics enter the aquatic environment through various routes due to low metabolic levels and increased use. Not only are antibiotics inherently toxic, but the spread of potential drug resistance introduced has been identified by the World Health Organization as one of the major threats and risks to global public health security. Therefore, how to efficiently remove antibiotics from water and eliminate the ecological safety hazards caused by antibiotics has been a hot topic in recent years. There are various research methods for decontaminating water with antibiotics. This paper reviews the research and application of various biological, physical, chemical methods and combined processes in antibiotic pollution control. Moreover, this paper describes the degradation mechanism, removal efficiency, influencing factors and technical characteristics of different antibiotics by various methods in detail. Finally, an outlook on future research in antibiotic removal is provided to help promote the development of antibiotic removal technology. Full article
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Review
A Review of the Treatment Process of Perfluorooctane Compounds in the Waters: Adsorption, Flocculation, and Advanced Oxidative Process
Water 2022, 14(17), 2692; https://doi.org/10.3390/w14172692 - 30 Aug 2022
Viewed by 862
Abstract
Perfluorinated compounds (PFCs) are recognized as a new type of refractory organic pollutants. Due to the persistent environmental pollution, bioaccumulation, and biotoxicity of PFCs, they have received extensive attention in recent years. To deal with the environmental risks caused by PFCs, the pollution [...] Read more.
Perfluorinated compounds (PFCs) are recognized as a new type of refractory organic pollutants. Due to the persistent environmental pollution, bioaccumulation, and biotoxicity of PFCs, they have received extensive attention in recent years. To deal with the environmental risks caused by PFCs, the pollution and distribution of PFCs in the aquatic environment are discussed in detail, mainly for the most widely used PFCs—perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS). The latest progress in the current processing technology of PFOA and PFOS is comprehensively introduced. It includes a variety of physical techniques to remove PFCs such as adsorption and flocculation. It has been confirmed that various adsorbents can play a key role in the enrichment and removal of PFCs through high specific surface area and hydrophobic interaction. In addition, traditional degradation processes are often unsatisfactory for PFCs, prompting the search for more efficient and cost-effective methods, with great progress having been made in advanced oxidation processes (AOPs) based on radical decomposition of pollutants. This review also integrates multiple advanced oxidation processes (AOPs) such as photocatalysis, electrochemical processes, ozone, the Fenton process, and ultrasound. This paper provides an overview of the various PFCs removal techniques and discusses their efficacy. It also explores future possible developments for PFCs elimination technologies for water treatment. Full article
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Review
Review of Advanced Oxidation Processes Based on Peracetic Acid for Organic Pollutants
Water 2022, 14(15), 2309; https://doi.org/10.3390/w14152309 - 25 Jul 2022
Viewed by 1166
Abstract
In recent years, the removal of organic pollutants from water and wastewater has attracted more attention to different advanced oxidation processes (AOPs). There has been increasing interest in using peroxyacetic acid (PAA), an emerging oxidant with low or no toxic by-products, yet the [...] Read more.
In recent years, the removal of organic pollutants from water and wastewater has attracted more attention to different advanced oxidation processes (AOPs). There has been increasing interest in using peroxyacetic acid (PAA), an emerging oxidant with low or no toxic by-products, yet the promotion and application are limited by unclear activation mechanisms and complex preparation processes. This paper synthesized the related research results reported on the removal of organic pollutants by PAA-based AOPs. Based on the research of others, this paper not only introduced the preparation method and characteristics of PAA but also summarized the mechanism and reactivity of PAA activated by the free radical pathway and discussed the main influencing factors. Furthermore, the principle and application of the newly discovered methods of non-radical activation of PAA in recent years were also reviewed for the first time. Finally, the shortcomings and development of PAA-based AOPs were discussed and prospected. This review provides a reference for the development of activated PAA technology that can be practically applied to the treatment of organic pollutants in water. Full article
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