Aerobic and Anaerobic Digestion Processes of Food Waste

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: closed (25 May 2024) | Viewed by 2365

Special Issue Editor


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Guest Editor
Department of Industrial Ecology, Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb, Croatia
Interests: chemical engineering; environmental engineering; environmental microbiology; bioremediation; biological wastewater treatment; biological waste treatment; biosorption; activated sludge; leachate

Special Issue Information

Dear Colleagues,

Biowaste is the most abundant waste component in terms of mass fraction and consists mainly of food waste generated during preparation or as residue after consumption. In the area of food waste management, there is therefore a very wide scope to contribute to the goals of the circular economy regarding the waste management hierarchy. In addition to the basic necessary input data on the physicochemical and biological properties and the available quantity and type of food waste in a given area, the selection of aerobic or anaerobic processes for the treatment of food waste must examine the mechanisms that affect the efficiency of the processing operation, from the process to the biochemical conditions.

Recently, the need for the rational and environmentally friendly use of available resources, especially renewable resources, which also include food waste, has become increasingly evident. Therefore, in the context the circular economy goals, it is very important to consider all possibilities for utilising the material and energy potential of food waste, taking into account the production of energy, chemicals, natural fertilisers, and soil conditioners. In the era of transition to renewable energy sources and environmentally sustainable technologies, biological processes, whether aerobic, anaerobic, or hybrid, inevitably play a key role.

This Special Issue on “Aerobic and Anaerobic Digestion Processes of Food Waste” aims to highlight advances and innovation in technologies based on biological processes for the utilization of food waste. Topics include, but are not limited to:

  • Physicochemical and biological properties of food waste (database);
  • State-of-the-art food waste pre-treatment and treatment methods;
  • Design and process selection based on the targeted processed products and their quality;
  • Issues affecting the efficiency of aerobic and anaerobic processes, waste streams and the quality of the final products;
  • Novelties in microbial ecology of aerobic and anaerobic digestion processes and food waste microbiome;
  • Environmental impact assessment (EIA) of aerobic and/or anaerobic food waste processing operations;
  • Life cycle analysis (LCA) of aerobic and/or anaerobic food waste treatment processes;
  • Diversity of useful end products obtained by anaerobic and/or aerobic food waste treatment processes and related advanced technology development;
  • Innovation and advances in anaerobic or aerobic digestion, co-digestion and other processes for food waste treatment.

Prof. Dr. Marija Vuković Domanovac
Guest Editors

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Keywords

  • food waste
  • aerobic/anaerobic processes
  • composting
  • anaerobic digestion
  • co-treatment
  • microorganisms
  • environmental impact assessment
  • lifecycle analysis
  • green technologies

Published Papers (2 papers)

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Research

14 pages, 1075 KiB  
Article
Design of a Bioreactor for Aerobic Biodegradation of Biowaste Based on Insight into Its Composition and Estimated Process Parameters
by Tomislav Domanovac, Dajana Kučić Grgić, Monika Šabić Runjavec and Marija Vuković Domanovac
Processes 2024, 12(3), 545; https://doi.org/10.3390/pr12030545 - 10 Mar 2024
Viewed by 865
Abstract
Biowaste, which often accounts for more than 50% of municipal waste, is an environmental problem if disposed of improperly in landfills but has great potential to achieve the recycling targets set out in Directive (EU) 2018/851. Despite the knowledge in theory and practice [...] Read more.
Biowaste, which often accounts for more than 50% of municipal waste, is an environmental problem if disposed of improperly in landfills but has great potential to achieve the recycling targets set out in Directive (EU) 2018/851. Despite the knowledge in theory and practice about the processing of biowaste and the benefits of recycling, there is a lack of methodological approaches in describing the process of aerobic biodegradation in a concise and suitable way for decision makers, environmental engineers, and project designers. This paper presents how basic data on the properties of biowaste can be used, using theoretical models, to determine basic indicators of the dynamics and material balance of the process. The maximum rate of CO2 generation on the 4th day was Rm = 45.3 g/d, with the potential of available, readily biodegradable components of the biowaste sample of P = 526 g CO2/kg VS. A substrate conversion of 51.7% was achieved in the bioreactor by the 17th day of treatment. The results of this analysis, together with future analyses of sensitivity and boundary conditions of the process, are useful for rapidly sizing a biological treatment system for municipal solid waste in a given area. Full article
(This article belongs to the Special Issue Aerobic and Anaerobic Digestion Processes of Food Waste)
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15 pages, 4891 KiB  
Article
Unraveling Anaerobic Digestion Instability: A Simple Index Based on the Kinetic Balance of Biochemical Reactions
by Ru Jia, Young-Chae Song, Zhengkai An, Keugtae Kim and Seong-Wook Oa
Processes 2023, 11(10), 2852; https://doi.org/10.3390/pr11102852 - 27 Sep 2023
Cited by 1 | Viewed by 712
Abstract
Restoration potential (RP) and deterioration potential (DP) were formulated to shed light on the kinetic balance between anaerobic biochemical reactions. RP is gauged by the ratio of the methanogenesis rate (MR) to the acidogenesis rate (AR), while the DP is the sum of [...] Read more.
Restoration potential (RP) and deterioration potential (DP) were formulated to shed light on the kinetic balance between anaerobic biochemical reactions. RP is gauged by the ratio of the methanogenesis rate (MR) to the acidogenesis rate (AR), while the DP is the sum of the accumulation rate (AcR) and dilution rate (DR) of total VFAs, normalized using the AR. In an anaerobic digester for a mixture of pulverized food waste and liquified sewage sludge, an RP above 1.0 signifies a restorative state in the kinetic balance of anaerobic biochemical reactions across various operational phases, including startup and steady state, and shifts in organic loading rate. Conversely, a DP value of 0.0 or higher denotes a deterioration in the kinetic balance. The instability index (ISI), calculated as the DP to RP ratio, serves as an indicator of an anaerobic digestion state. When the standard deviation of ISI surpasses 0.2, it signifies instability in biochemical reactions; however, an average ISI below 0.05 indicates a stable digestion process. The study underscores the efficacy of RP, DP, and ISI as robust indicators for assessing the stability of anaerobic digestion based on the kinetics of biochemical reactions. Full article
(This article belongs to the Special Issue Aerobic and Anaerobic Digestion Processes of Food Waste)
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