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Applied Sciences
Special Issues
Promising Research and Strategies in Wastewater Treatment, Sludge Management and...
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Promising Research and Strategies in Wastewater Treatment, Sludge Management and Valorization - 2nd Edition

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: 20 August 2024 | Viewed by 1172

Special Issue Editors

Dr. Amanda Laca Pérez

E-Mail Website
Guest Editor
Department of Chemical and Environmental Engineering, University of Oviedo, 33006 Oviedo, Spain
Interests: enzymatic hydrolysis; fungi; biological treatment; lignocellulosic biomass; cellulose; hemicellulose; lignin
Special Issues, Collections and Topics in MDPI journals
Dr. Yolanda Patiño

E-Mail Website
Guest Editor
Catalysis, Reactors and Control Research Group (CRC), Department of Chemical and Environmental Engineering, University of Oviedo, 33006 Oviedo, Spain
Interests: emerging pollutants; adsorption process; electrochemical degradation; sludge valorization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Rapid urbanization and industrialization, in addition to the presence of new pollutants, make it necessary to search for new wastewater treatment technologies that meet the high treatment capacity, as well as future water quality requirements.

Conventional WWTPs are designed primarily to remove organic matter and nutrients. For this reason, in some cases, these treatments are inefficient for the removal of certain pollutants, entailing consequent risks. Furthermore, large amounts of sludge, derived from these processes, are produced every year, being considered as the main residue from these plants. Their management necessitates important costs, both in economic and environmental terms, which makes it necessary to explore alternatives for their valorization. Waste reduction and the reuse of wastewater seem to be excellent options for meeting circular economy goals in the wastewater treatment sector by reducing environmental impacts. The topics of this Special Issue include, but are not limited to, the following:

  • Novel pollutant removal using different technologies;
  • Microplastics as new emerging pollutants;
  • Novel technologies for wastewater and sludge treatment;
  • Sludge valorization;
  • Wastewater reuse;
  • Environmental assessment of wastewater treatment.

You can find the volume I with related publications at: https://www.mdpi.com/journal/applsci/special_issues/Wastewater_Sludge_Management.

Dr. Amanda Laca Pérez
Dr. Yolanda Patiño
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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • wastewater treatment
  • emerging pollutants
  • microplastics
  • sludge valorization
  • lifecycle assessment

Published Papers (1 paper)

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Research

24 pages, 3142 KiB  
Article
Exploring the Utilisation of Natural Biosorbents for Effective Methylene Blue Removal
by Fatih Güleç, Orla Williams, Abby Samson, Emily T. Kostas, Lee A. Stevens and Edward Lester
Appl. Sci. 2024, 14(1), 81; https://doi.org/10.3390/app14010081 - 21 Dec 2023
Cited by 2 | Viewed by 953
Abstract
This paper presents a comprehensive analysis of the adsorbent capacity of five distinctly different biosorbents derived from untreated biomasses. The optimal adsorption capacity of seaweed (Laminaria digitata), horse chestnut husk, hazelnut husk, rapeseed residue, and whitewood to remove methylene blue (MB) [...] Read more.
This paper presents a comprehensive analysis of the adsorbent capacity of five distinctly different biosorbents derived from untreated biomasses. The optimal adsorption capacity of seaweed (Laminaria digitata), horse chestnut husk, hazelnut husk, rapeseed residue, and whitewood to remove methylene blue (MB) dye was assessed by analysing the effects of particle size, pH, temperature, and initial dye concentrations. Furthermore, the adsorption kinetics, isotherms, and adsorption thermodynamics were investigated. The results showed that relatively high MB adsorption capacity was achieved by Laminaria digitata (~180 mg/g), in addition to a reasonable MB adsorption capacity of horse chestnut husk (~130 mg/g), hazelnut husk (~110 mg/g), and rapeseed residue (~80 mg/g). However, whitewood provides a relatively low adsorption capacity of below 20 mg/g. The best fit with experimental results regardless of biosorbent type was a pseudo-second-order kinetic model with the lowest mean absolute percentage error (ε, MAPE < 2.5%) and the highest correlation coefficients (R2 > 0.99). Although the pseudo-second-order kinetic model is often associated with chemisorption, the low enthalpy values (<29.30 kJ/mol) typically suggest that the adsorption process is more characteristic of physisorption, which involves weaker van der Waals forces rather than the stronger covalent bonds of chemisorption. This proposed a multi-step adsorption process involving both physisorption and chemisorption. The adsorption isotherm of Langmuir showed superior fitting results for Laminaria digitata and hazelnut husk. In contrast, rapeseed residue and horse chestnut husk fit better with the Freundlich adsorption isotherm. The Langmuir adsorption isotherms showed a maximum adsorption capacity of ~500 mg/g for Laminaria digitata, followed by horse chestnut husk (~137 mg/g), hazelnut husk (~120 mg/g), and rapeseed residue (~85 mg/g). The Gibbs free energy was negative for Laminaria digitata < horse chestnut husk < hazelnut husk < 0, which suggests that the removal of MB is thermodynamically favourable, as the adsorption process occurs spontaneously. The results of the study indicate that MB dye removal using untreated biomasses has the potential to be a low-cost valorisation option in the holistic whole life cycle valorisation pathway for Laminaria digitata, horse chestnut husk, and hazelnut husk. Full article
(This article belongs to the Special Issue Promising Research and Strategies in Wastewater Treatment, Sludge Management and Valorization - 2nd Edition)
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