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Microorganisms
Special Issues
Microbial Communities in Waste Treatment
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Microbial Communities in Waste Treatment

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 6032

Special Issue Editors

Dr. Yu Xia

E-Mail Website
Guest Editor
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China
Interests: microbiome; wastewater treatment; metagenomics; nanopore sequencing; antibiotic resistance genes; anaerobic digester; groundwater
Dr. Anna H. Kaksonen

E-Mail Website
Guest Editor
School of Biomedical Sciences, University of Western Australia, Crawley 6009, Australia
Interests: biocorrosion; bioelectrochemistry; bioflotation; biogeochemistry; bioleaching; biomining; biooxidation; bioprecipitation; bioreduction; bioremediation; circular economy; resource recovery; waste management; wastewater treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Microorganisms are vital not only in biogeochemistry and nutrient cycling, but also in biodegradation and biotransformation of natural and anthropogenic wastes. In the biodegradation of organic solid wastes, the syntrophic cooperation of physiologically distinctive microorganisms are crucial to the efficiency and robustness of wastewater, waste sludge and food waste treatment process like activated sludge or anaerobic digestion. Before we can fully exploit their potential in biological treatment systems, several fundamental aspects in microbial physiology and microbial community ecology still need to be better understood. What are the physiological constrains that govern the dynamics of microbial community assembly and disassembly in biological treatment systems? What are the division of labor, cooperation and competition of microorganisms in biological treatment systems, and their impact on community stability, diversity loss, and system performance? Furthermore, methodologies for biological treatment of high-concentration or toxic pollutants (such as heavy metals, antibiotics, and aromatics) need to be investigated and addressed urgently. How to reinforce the metabolic adaptation of microbial consortia in dealing with high-concentration or toxic pollutants? How can microbial biotechnology be used to quickly degrade, recycle, and transform high-concentration contaminants into value-added products?

The Special Issue aims to gather up-to-date research on microbial physiology, ecology and biotechnology in waste treatment, and will cover, but is not limited to, the following topics:

  • Microbial community assembly processes in biological waste treatment biosystems;
  • Microbial symbioses and microbial interactions in waste treatment biosystems;
  • Microbial responses to stress factors;
  • Novel microbial biotechnology dealing with high-concentration or toxic pollutants;
  • Antimicrobial resistance mechanisms;
  • Discovering the microorganisms responsible for degradation of particular pollutants.

This Special Issue is addressed to microbial professional, specifically to environmental microbiologists, environmental engineering specialist, as well as to researchers and academics involved in environmental engineering microbiology.

Dr. Yu Xia
Prof. Dr. Anna H. Kaksonen
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. Microorganisms 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 2700 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
  • solid waste
  • microbial community
  • community assembly
  • microbial interactions
  • microbial biotechnology
  • antimicrobial resistance
  • anaerobic digestion
  • activated sludge
  • food waste
  • antibiotics

Published Papers (3 papers)

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Research

20 pages, 2020 KiB  
Article
Petroleum-Degrading Fungal Isolates for the Treatment of Soil Microcosms
by Dalel Daâssi and Fatimah Qabil Almaghrabi
Microorganisms 2023, 11(5), 1351; https://doi.org/10.3390/microorganisms11051351 - 22 May 2023
Cited by 3 | Viewed by 2087
Abstract
The main purpose of this study was to degrade total petroleum hydrocarbons (TPHs) from contaminated soil in batch microcosm reactors. Native soil fungi isolated from the same petroleum-polluted soil and ligninolytic fungal strains were screened and applied in the treatment of soil-contaminated microcosms [...] Read more.
The main purpose of this study was to degrade total petroleum hydrocarbons (TPHs) from contaminated soil in batch microcosm reactors. Native soil fungi isolated from the same petroleum-polluted soil and ligninolytic fungal strains were screened and applied in the treatment of soil-contaminated microcosms in aerobic conditions. The bioaugmentation processes were carried out using selected hydrocarbonoclastic fungal strains in mono or co-cultures. Results demonstrated the petroleum-degrading potential of six fungal isolates, namely KBR1 and KBR8 (indigenous) and KBR1-1, KB4, KB2 and LB3 (exogenous). Based on the molecular and phylogenetic analysis, KBR1 and KB8 were identified as Aspergillus niger [MW699896] and tubingensis [MW699895], while KBR1-1, KB4, KB2 and LB3 were affiliated with the genera Syncephalastrum sp. [MZ817958], Paecilomyces formosus [MW699897], Fusarium chlamydosporum [MZ817957] and Coniochaeta sp. [MW699893], respectively. The highest rate of TPH degradation was recorded in soil microcosm treatments (SMT) after 60 days by inoculation with Paecilomyces formosus 97 ± 2.54%, followed by bioaugmentation with the native strain Aspergillus niger (92 ± 1.83%) and then by the fungal consortium (84 ± 2.21%). The statistical analysis of the results showed significant differences. Full article
(This article belongs to the Special Issue Microbial Communities in Waste Treatment)
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14 pages, 2390 KiB  
Article
Metagenomic Analysis of Bacterial, Archaeal and Fungal Diversity in Two-Stage Anaerobic Biodegradation for Production of Hydrogen and Methane from Corn Steep Liquor
by Galina Stoyancheva, Lyudmila Kabaivanova, Venelin Hubenov and Elena Chorukova
Microorganisms 2023, 11(5), 1263; https://doi.org/10.3390/microorganisms11051263 - 11 May 2023
Viewed by 1524
Abstract
The main purpose of this study was to identify the microbial communities (bacterial, archaeal and fungal) in a two-stage system of anaerobic bioreactors for the production of hydrogen and methane from the waste substrate—corn steep liquor. Wastes from the food industry are valuable [...] Read more.
The main purpose of this study was to identify the microbial communities (bacterial, archaeal and fungal) in a two-stage system of anaerobic bioreactors for the production of hydrogen and methane from the waste substrate—corn steep liquor. Wastes from the food industry are valuable resources with potential in biotechnological production because of their high organic matter contents. In addition, the production of hydrogen and methane, volatile fatty acids, reducing sugars and cellulose content was monitored. Two-stage anaerobic biodegradation processes were performed by microbial populations in the first hydrogen generating bioreactor (working volume of 3 dm3) and in the second methane-generating reactor (working volume of 15 dm3). Cumulative hydrogen yield reached 2000 cm3 or 670 cm3/L a day, while the methane production reached a maximum quantity of 3300 cm3 or 220 cm3/L a day. Microbial consortia in anaerobic digestion systems play an essential role for process optimization and biofuel production enhancement. The obtained results showed the possibility of conducting two separate processes—the hydrogenic (hydrolysis and acidogenesis) and methanogenic (acetogenesis and methanogenesis)—as two stages of anaerobic digestion to favor energy production under controlled conditions with corn steep liquor. The diversity of microorganisms as main participants in the processes in the bioreactors of the two-stage system was followed using metagenome sequencing and bioinformatics analysis. The obtained metagenomic data showed that the most abundant phylum in both bacterial communities was Firmicutes—58.61% and 36.49% in bioreactors 1 and 2, respectively. Phylum Actinobacteria were found in significant quantities (22.91%) in the microbial community in Bioreactor 1, whereas in Bioreactor 2, they were 2.1%. Bacteroidetes are present in both bioreactors. Phylum Euryarchaeota made up 0.4% of the contents in the first bioreactor and 11.4% in the second. As the dominant genera among methanogenic archaea are Methanothrix (8.03%) and Methanosarcina (3.39%), the main fungal representatives were Saccharomyces cerevisiae. New knowledge of anaerobic digestion mediated by novel microbial consortia could be widely used to convert different wastes to green energy. Full article
(This article belongs to the Special Issue Microbial Communities in Waste Treatment)
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12 pages, 1598 KiB  
Article
Polyhydroxybutyrate Production from Methane and Carbon Dioxide by a Syntrophic Consortium of Methanotrophs with Oxygenic Photogranules without an External Oxygen Supply
by Selim Ashoor, Seong-Hoon Jun, Han Do Ko, Jinwon Lee, Jérôme Hamelin, Kim Milferstedt and Jeong-Geol Na
Microorganisms 2023, 11(5), 1110; https://doi.org/10.3390/microorganisms11051110 - 24 Apr 2023
Viewed by 1403
Abstract
Here, a syntrophic process was developed to produce polyhydroxy-β-butyrate (PHB) from a gas stream containing CH4 and CO2 without an external oxygen supply using a combination of methanotrophs with the community of oxygenic photogranules (OPGs). The co-culture features of Methylomonas sp. [...] Read more.
Here, a syntrophic process was developed to produce polyhydroxy-β-butyrate (PHB) from a gas stream containing CH4 and CO2 without an external oxygen supply using a combination of methanotrophs with the community of oxygenic photogranules (OPGs). The co-culture features of Methylomonas sp. DH-1 and Methylosinus trichosporium OB3b were evaluated under carbon-rich and carbon-lean conditions. The critical role of O2 in the syntrophy was confirmed through the sequencing of 16S rRNA gene fragments. Based on their carbon consumption rates and the adaptation to a poor environment, M. trichosporium OB3b with OPGs was selected for methane conversion and PHB production. Nitrogen limitation stimulated PHB accumulation in the methanotroph but hindered the growth of the syntrophic consortium. At 2.9 mM of the nitrogen source, 1.13 g/L of biomass and 83.0 mg/L of PHB could be obtained from simulated biogas. These results demonstrate that syntrophy has the potential to convert greenhouse gases into valuable products efficiently. Full article
(This article belongs to the Special Issue Microbial Communities in Waste Treatment)
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