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Water
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Advances in Biological Technologies for Drinking and Wastewater Treatment
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Advances in Biological Technologies for Drinking and 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: 10 May 2025 | Viewed by 491

Special Issue Editors

Dr. Alejandro Gonzalez-Martinez

grade E-Mail Website
Guest Editor
Department of Microbiology, University of Granada, Granada, Spain
Interests: molecular biology; biotechnology; applied microbiology; next-generation sequencing; biological wastewater treatment
Special Issues, Collections and Topics in MDPI journals
Dr. Barbara Muñoz-Palazon

E-Mail Website
Guest Editor
Department of Ecological and Biological Sciences, University of Tuscia, Viterbo, Italy
Interests: biological wastewater treatment; biodegradation; microbial community of activated sludge; microbial interactions; emerging wastewater micropollutants; antibiotic resistance
Dr. Alejandro Rodriguez-Sanchez

E-Mail Website
Guest Editor
Institute of Water Research, University of Granada, Granada, Spain
Interests: water and wastewater engineering; water quality; water treatment; emerging pollutants in wastewater; applied microbiology; next-generation sequencing; biological wastewater treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to showcase the recent advancements in biological technologies for drinking and wastewater treatment, highlighting the strengths, challenges, and emerging opportunities in this evolving field. As we enter a new era of environmental biotechnology, the integration of biological processes in water treatment offers innovative solutions to address both existing and future water quality challenges.

We invite researchers to contribute original articles that explore cutting-edge developments in biological processes and technologies. Contributions may include, but are not limited to, the following areas:

  • Activated sludge bioreactors;
  • membrane bioreactors;
  • moving bed biofilm reactors;
  • biological processes integrated with membrane technologies;
  • granular biomass systems;
  • anammox technologies;
  • anaerobic digestion bioreactors;
  • biological treatment of groundwater;
  • treatment of polluted water;
  • advanced biological treatment processes.

This Special Issue seeks to provide a comprehensive view of the biotechnological approaches shaping the future of drinking and wastewater treatment thus encouraging contributions that highlight the practical applications and theoretical innovations in this vital field.

Dr. Alejandro Gonzalez-Martinez
Dr. Barbara Muñoz-Palazon
Dr. Alejandro Rodriguez-Sanchez
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. Water 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 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

  • wastewater biological treatment
  • drinking water treatment
  • anaerobic reactor systems
  • aerobic reactor technologies
  • environmental biotechnology
  • groundwater treatment
  • membrane-based bioreactors
  • granular biomass processes
  • microbial communities in water and wastewater treatment

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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Further information on MDPI's Special Issue polices can be found here.

Published Papers (1 paper)

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Research

16 pages, 1453 KiB  
Article
Efficient Solar-Powered Bioremediation of Hexavalent Chromium in Contaminated Waters by Chlorella sp. MQ-1
by Tiancheng Zhou, Zhangzhang Xie, Xinyu Jiang, Xiangbo Zou, Jiong Cheng, Chuangting Chen, Cao Kuang, Ji Ye, Ying Wang and Fanghua Liu
Water 2024, 16(22), 3315; https://doi.org/10.3390/w16223315 - 18 Nov 2024
Viewed by 343
Abstract
Microalgae are known for their efficient removal of hexavalent chromium (Cr(VI)) through biosorption and bioaccumulation, yet the subsequent release of Cr(VI) upon cell death remains a challenge. The reduction of Cr(VI) to the less toxic trivalent chromium [Cr(III)] is another critical remediation strategy [...] Read more.
Microalgae are known for their efficient removal of hexavalent chromium (Cr(VI)) through biosorption and bioaccumulation, yet the subsequent release of Cr(VI) upon cell death remains a challenge. The reduction of Cr(VI) to the less toxic trivalent chromium [Cr(III)] is another critical remediation strategy that mitigates the risk of Cr(VI) re-release, but research on microalgal reduction of Cr(VI) is scarce. In this study, a microalgal strain designated as MQ-1 was isolated from chromium-contaminated mine effluent, demonstrating the capability to tolerate and remove Cr(VI). Phylogenetic analysis revealed that MQ-1 is closely related to the genus Chlorella; hence, it is classified as Chlorella sp. MQ-1. This strain exhibited robust growth at Cr(VI) concentrations below 2 mg/L, achieving a removal rate higher than 82% for initial Cr(VI) concentrations between 0.5 and 1 mg/L after a 5-day incubation period. Mechanistic studies revealed that MQ-1 promoted the removal of Cr(VI) mainly through intracellular bioreduction and bioaccumulation processes, in which more than 60% of Cr(VI) was reduced to the less toxic Cr(III) and stocked in the cells. A two-stage cultivation strategy, involving initial biomass accumulation followed by Cr(VI) treatment, significantly enhanced the removal efficiency, which was further accelerated under illuminated conditions. Notably, MQ-1 cultures with initial OD680 values of 4 and 6 accomplished 84.28% and 91.31% Cr(VI) removal from 2 mg/L solutions, respectively, within 30 hours under light exposure. These findings highlight the potential of MQ-1 to utilize renewable solar energy to reduce Cr(VI) and to mitigate the risk of its re-release into the environment. This characteristic positions MQ-1 as a potentially sustainable and cost-effective solution for Cr(VI) remediation and suggests its significant potential for large-scale implementation in bioremediation strategies aimed at Cr(VI)-contaminated waters. Full article
(This article belongs to the Special Issue Advances in Biological Technologies for Drinking and Wastewater Treatment)
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