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Energies
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Anaerobic Digestion: A Holistic Solution to Organic Waste and Contaminants
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Anaerobic Digestion: A Holistic Solution to Organic Waste and Contaminants

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 7923

Special Issue Editor

Dr. Noori Saady

E-Mail Website
Guest Editor
Faculty of Engineering and Applied Sciences, Memorial University of Newfoundland, St. John's, NL, Canada
Interests: environmental biotechnologies for waste management and resources recovery; livestock manure management; psychrophilic anaerobic digestion; on-farm biogas; soil and groundwater remediation; microbial fuel cells; biocatalysts
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

While anaerobic digestion (AD) started as a secondary treatment at domestic wastewater treatment plants to stabilize the separated solids, it paved its way to more diversified applications. Recently, it re-emerged to offer a holistic solution to many organic waste and contaminants. The most significant applications are agriculture, livestock manure, and industrial organic waste treatment, bioremediation of contaminated sites and groundwater, bioenergy production, pharmaceutical, and specialty contaminants degradation, value-added products generation such as fertilizers, biofibers, volatile fatty acids and alcohols, wet and dry feedstock intake, and many more other applications. Importantly, AD increasingly assumes a central role in addressing greenhouse gas emissions thus it is a key player in climate change mitigation efforts. The successful applications and the central role of AD in the green economy and climate change mitigation came true because of the advancement in the analytical instruments and methods, equipment and sensors, infrastructure for the digester, feeding, mixing, and heating systems, software supporting modeling and simulation, molecular biology methods which elucidated the microbial culture that previously was considered as a black box. The easy scalability of AD allowed installations ranging from household to centralized AD plants for agriculture and industrial organic waste.

This Special Issue of Energies entitled “Anaerobic Digestion: A Holistic Solution to Organic Waste and Contaminants” tackles anaerobic digestion to embody its holistic nature in managing organic waste. Therefore, we invite authors to submit high-quality research papers (experimental and simulation/modeling), short communications, case studies, analytical and assessment papers on cost and economics, and state-of-the-art critical reviews on the mentioned aspects of anaerobic digestion.

Dr. Noori Saady
Guest Editor

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. Energies 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

  • holistic
  • anaerobic digestion
  • biogas
  • microbiome
  • greenhouse gas emissions

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Published Papers (2 papers)

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Review

15 pages, 1834 KiB  
Review
Chemical Methods for Hydrolyzing Dairy Manure Fiber: A Concise Review
by Noori M. Cata Saady, Fatemeh Rezaeitavabe and Juan Enrique Ruiz Espinoza
Energies 2021, 14(19), 6159; https://doi.org/10.3390/en14196159 - 27 Sep 2021
Cited by 6 | Viewed by 2865
Abstract
This paper reviews the chemical hydrolysis processes of dairy manure fiber to make its sugar accessible to microorganisms during anaerobic digestion and identifies obstacles and opportunities. Researchers, so far, investigated acid, alkali, sulfite, and advanced oxidation processes (such as hydrogen peroxide assisted by [...] Read more.
This paper reviews the chemical hydrolysis processes of dairy manure fiber to make its sugar accessible to microorganisms during anaerobic digestion and identifies obstacles and opportunities. Researchers, so far, investigated acid, alkali, sulfite, and advanced oxidation processes (such as hydrogen peroxide assisted by microwave/ultrasound irradiation, conventional boiling, and wet oxidation), or their combinations. Generally, dilute acid (3–10%) is less effective than concentrated acid (12.5–75%), which decrystallizes the cellulose. Excessive alkaline may produce difficult-to-degrade oxycellulose. Therefore, multi-step acid hydrolysis (without alkaline) is preferred. Such processes yielded 84% and 80% manure-to-glucose and -xylose conversion, respectively. Acid pretreatment increases lignin concentration in the treated manure and hinders subsequent enzymatic processes but is compatible with fungal cellulolytic enzymes which favor low pH. Manure high alkalinity affects dilute acid pretreatment and lowers glucose yield. Accordingly, the ratio of manure to the chemical agent and its initial concentration, reaction temperature and duration, and manure fineness need optimization because they affect the hydrolysis rate. Optimizing these factors or combining processes should balance removing hemicellulose and/or lignin and increasing cellulose concentrations while not hindering any subsequent process. The reviewed methods are neither economical nor integratable with the on-farm anaerobic digestion. Economic analysis and energy balance should be monolithic components of the research. More research is required to assess the effects of nitrogen content on these processes, optimize it, and determine if another pretreatment is necessary. Full article
(This article belongs to the Special Issue Anaerobic Digestion: A Holistic Solution to Organic Waste and Contaminants)
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26 pages, 1444 KiB  
Review
Anaerobic Digestion of Blood from Slaughtered Livestock: A Review
by Tasnia Hassan Nazifa, Noori M. Cata Saady, Carlos Bazan, Sohrab Zendehboudi, Adnan Aftab and Talib M. Albayati
Energies 2021, 14(18), 5666; https://doi.org/10.3390/en14185666 - 9 Sep 2021
Cited by 20 | Viewed by 4528
Abstract
Blood from livestock slaughtering imposes a high organic pollution load and risks. If it is discharged untreated to sewer systems, it increases the organic pollution load on wastewater treatment plants by 35–50%. This paper reviews blood anaerobic digestion. It analyzes the quantities, composition, [...] Read more.
Blood from livestock slaughtering imposes a high organic pollution load and risks. If it is discharged untreated to sewer systems, it increases the organic pollution load on wastewater treatment plants by 35–50%. This paper reviews blood anaerobic digestion. It analyzes the quantities, composition, methane potential reported, microbiology, biochemical pathways of blood protein degradation, environmental and health issues, and strategies suggested to manage them during livestock blood anaerobic digestion. Although challenging, anaerobic digestion of blood as a mono-substrate is possible if the culture-reactor system is controlled based on a complete characterization and understanding of the microbial community and its metabolic activities. Co-digestion of blood and other feedstock proceeds well if the mixtures are well designed. Generally, the specific methane yield from digesting blood alone ranges between zero and 0.45 m3 kg−1 protein, whereas for co-digesting blood and other substrates, the yield varies between 0.1 and 0.7 m3 kg−1 volatile solids. More research is required for microbiology and kinetics, the role of adsorbents, reactor configuration, and culture adaptation during anaerobic digestion of blood to better control the process. Full article
(This article belongs to the Special Issue Anaerobic Digestion: A Holistic Solution to Organic Waste and Contaminants)
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