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Microorganisms
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Biological Treatment of Solidwaste
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Biological Treatment of Solidwaste

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

Deadline for manuscript submissions: closed (30 December 2023) | Viewed by 2125

Special Issue Editors

Dr. Tianfeng Wang

E-Mail Website
Guest Editor
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, China
Interests: anaerobic digestion; degradation; microbial community
Dr. Suyun Xu

E-Mail Website
Guest Editor
Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
Interests: solid waste treatment and recycling; organic solid waste biological treatment; anaerobic digestion; environmental microbial technology;

Special Issue Information

Dear Colleagues,

Biological treatment is a kind of treatment technology that uses organisms in nature, mainly microorganisms, to transform degradable organic solid waste into stable products, energy, and other useful substances. The main organic solid waste biological treatment technologies include composting, anaerobic digestion, biodrying, and bioleaching. Biological treatment is primarily used to deal with organic waste, also known as biomass waste, mainly including kitchen waste (leftovers, leftovers, fruit peel, etc.), bark, wood chips, crop stalks, animal feces, and sludge, among others.

Dr. Tianfeng Wang
Dr. Suyun Xu
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

  • composting
  • anaerobic digestion
  • biodrying
  • bioleaching

Published Papers (2 papers)

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Research

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13 pages, 4846 KiB  
Article
Comparison of Thermophilic–Mesophilic and Mesophilic–Thermophilic Two-Phase High-Solid Sludge Anaerobic Digestion at Different Inoculation Proportions: Digestion Performance and Microbial Diversity
by Tianfeng Wang, Jie Wang, Jiajia Pu, Chengxiang Bai, Cheng Peng, Hailong Shi, Ruoyu Wu, Ziying Xu, Yuqian Zhang, Dan Luo, Linhai Yang and Qingfang Zhang
Microorganisms 2023, 11(10), 2409; https://doi.org/10.3390/microorganisms11102409 - 27 Sep 2023
Viewed by 1103
Abstract
This study investigated the performance of thermophilic–mesophilic (T-M) and mesophilic–thermophilic (M-T) two-phase sludge anaerobic digestion at different inoculation proportions after a change in digestion temperature. After temperature change, the pH, total ammonia nitrogen (TAN), free ammonia nitrogen (FAN), solubility chemical oxygen demand (SCOD), [...] Read more.
This study investigated the performance of thermophilic–mesophilic (T-M) and mesophilic–thermophilic (M-T) two-phase sludge anaerobic digestion at different inoculation proportions after a change in digestion temperature. After temperature change, the pH, total ammonia nitrogen (TAN), free ammonia nitrogen (FAN), solubility chemical oxygen demand (SCOD), and total alkalinity (TA) levels of two-phase digesters were between thermophilic control digesters and mesophilic control digesters. However, the volatile fatty acid (VFA) levels of two-phase digesters were higher than those of thermophilic or mesophilic control digesters. The bacteria communities of M-T two-phase digesters were more diverse than those of T-M. After a change in digestion temperature, the bacterial community was dominated by Coprothermobacter. After a change of digestion temperature, the relative abundance (RA) of Methanobacterium, Methanosaeta, and Methanospirillum of M-T two-phase digesters was higher than that of T-M two-phase digesters. In comparison, the RA of Methanosarcina of T-M two-phase digesters was higher than that of M-T two-phase digesters. The ultimate methane yields of thermophilic control digesters were greater than those of mesophilic control digesters. Nevertheless, the ultimate methane yield levels of M-T two-phase digesters were greater than those of T-M two-phase digesters. The ultimate methane yields of all two-phase digesters presented an earlier increase and later decrease trend with the increasing inoculation proportion. Optimal methane production condition was achieved when 15% of sludge (T-M15) was inoculated under mesophilic–thermophilic conditions, which promoted 123.6% (based on mesophilic control) or 27.4% (based on thermophilic control). An optimal inoculation proportion (about 15%) balanced the number and activity of methanogens of high-solid sludge anaerobic digestion. Full article
(This article belongs to the Special Issue Biological Treatment of Solidwaste)
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Review

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17 pages, 1725 KiB  
Review
Research on the Resource Recovery of Medium-Chain Fatty Acids from Municipal Sludge: Current State and Future Prospects
by Yuhao Liu, Yacong Duan, Long Chen, Ziyan Yang, Xiaoli Yang, Shuli Liu and Gangfu Song
Microorganisms 2024, 12(4), 680; https://doi.org/10.3390/microorganisms12040680 - 28 Mar 2024
Viewed by 492
Abstract
The production of municipal sludge is steadily increasing in line with the production of sewage. A wealth of organic contaminants, including nutrients and energy, are present in municipal sludge. Anaerobic fermentation can be used to extract useful resources from sludge, producing hydrogen, methane, [...] Read more.
The production of municipal sludge is steadily increasing in line with the production of sewage. A wealth of organic contaminants, including nutrients and energy, are present in municipal sludge. Anaerobic fermentation can be used to extract useful resources from sludge, producing hydrogen, methane, short-chain fatty acids, and, via further chain elongation, medium-chain fatty acids. By comparing the economic and use values of these retrieved resources, it is concluded that a high-value resource transformation of municipal sludge can be achieved via the production of medium-chain fatty acids using anaerobic fermentation, which is a hotspot for future research. In this study, the selection of the pretreatment method, the method of producing medium-chain fatty acids, the influence of the electron donor, and the technique used to enhance product synthesis in the anaerobic fermentation process are introduced in detail. The study outlines potential future research directions for medium-chain fatty acid production using municipal sludge. These acids could serve as a starting point for investigating other uses for municipal sludge. Full article
(This article belongs to the Special Issue Biological Treatment of Solidwaste)
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