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Research on Resource Utilization of Solid Waste

A special issue of Sustainability (ISSN 2071-1050).

Deadline for manuscript submissions: 30 June 2026 | Viewed by 2127

Special Issue Editor

School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
Interests: functional porous materials; nanomaterials; solid waste resource utilization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The rapid development of human civilization has resulted in a significant increase in the production of solid waste, much of which has no practical value. Due to the enormous quantities involved, the diversity of types of waste, and its complex components, solid waste has occupied substantial land resources and poses significant threats to environmental quality. To address these concerns, several treatment techniques, including incineration, landfill, and solidification, have been developed. Currently, the resource utilization of solid waste has attracted increasing attention and popular methods include the production of building materials, the extraction of precious metals, the recycling of useful components, the construction of road materials, and soil reclamation technologies. This Special Issue aims to consolidate cutting-edge research on the harmless treatment and resource utilization of solid waste for diverse applications.

In this Special Issue, we welcome original research articles, critical reviews, and perspective papers addressing scientific advances and technological innovations in solid waste resource utilization. Submissions may span theoretical investigations, experimental studies, and industrial case studies. Contributions can be based on multidisciplinary backgrounds, including chemistry, environmental science, materials science, nanotechnology, mineral engineering, civil engineering, etc.

Research areas may include, but are not limited to, the following topics:

  1. The synthesis of functional materials;
  2. The development of civil engineering materials;
  3. The extraction of critical metals;
  4. The recycling of useful components;
  5. Other emerging applications.

I am looking forward to receiving your contributions.

Dr. Ning Yuan
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 250 words) can be sent to the Editorial Office for assessment.

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. Sustainability 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 2400 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

  • solid waste
  • adsorption
  • catalysis
  • buildings
  • concrete
  • environments
  • energy

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Published Papers (2 papers)

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Research

23 pages, 5049 KB  
Article
Assessing the Suitability of Digestate and Compost as Organic Fertilizers: A Comparison of Different Biological Stability Indices for Sustainable Development in Agriculture
by Isabella Pecorini, Francesco Pasciucco, Roberta Palmieri and Antonio Panico
Sustainability 2026, 18(3), 1196; https://doi.org/10.3390/su18031196 - 24 Jan 2026
Cited by 1 | Viewed by 537
Abstract
Nowadays, biowaste valorization is a key point in the circular economy. Digestate and compost from organic waste treatment can be used as nutrient-rich fertilizers. In Europe, the use of biowaste-derived fertilizers is promoted by the European Fertilizer Regulation (EU) 2019/1009, which requires verification [...] Read more.
Nowadays, biowaste valorization is a key point in the circular economy. Digestate and compost from organic waste treatment can be used as nutrient-rich fertilizers. In Europe, the use of biowaste-derived fertilizers is promoted by the European Fertilizer Regulation (EU) 2019/1009, which requires verification of their biological stability through regulated indices; however, it is not clear whether the proposed indices and threshold values indicate the same level of stability and what correlations there are between them. This study compared four biological stability indices, namely Oxygen Uptake Rate (OUR), Self-Heating (SH), Residual Biogas Potential (RBP), and Dynamic Respirometric Index (DRI), which were tested on 50 samples of compost and digestate. Overall, the results revealed that most of the compost and digestate samples were quite far from European standards. On the contrary, the RBP test seemed to be less stringent than the other indices, since a much larger number of samples was closer to or in compliance with the established threshold. Data analysis using Pearson’s coefficients showed a strong linear correlation between the indices. Nevertheless, the linear regression predictive model based on experimental data demonstrated that the indices could not represent the same level of stability, providing poor consistency and variability in the predicted values and established threshold. In particular, the DRI test appeared to be more severe than the other aerobic indices. This work could provide valuable support in improving evaluation criteria and promoting a sustainable use of compost and digestate as organic fertilizers from a circular economy perspective. Full article
(This article belongs to the Special Issue Research on Resource Utilization of Solid Waste)
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16 pages, 1612 KB  
Article
Evaluation of the Resource Utilization Potential of Capsicum Residue for Sustainable Industrial Capsaicin Extraction
by Zhifeng Hu, Shijiao Li, Tianxue Yang, Dongyang Li, Xiaowei Wang, Yuxin Chen, Zhe Zhang, Zhiliang Yao, Dayang Yu, Shi Cheng, Yilin Wang and Jiaomei Liu
Sustainability 2025, 17(22), 10303; https://doi.org/10.3390/su172210303 - 18 Nov 2025
Viewed by 935
Abstract
Capsicum residue generated from industrial capsaicin extraction is rich in nutrients and represents a significant fraction of solid waste in the food processing industry. Despite its potential value, limited efforts have been devoted to its resource recovery, leading to considerable resource loss and [...] Read more.
Capsicum residue generated from industrial capsaicin extraction is rich in nutrients and represents a significant fraction of solid waste in the food processing industry. Despite its potential value, limited efforts have been devoted to its resource recovery, leading to considerable resource loss and environmental burdens. This study systematically evaluates the applicability of existing food waste recycling technologies for capsicum residue and assesses its valorization potential through comprehensive characterization. The results indicate that capsicum residue holds promise as a feedstock for pectin extraction and as a component in animal feed. Regarding anaerobic fermentation for acid production, the maximum volatile fatty acids (VFAs) yield and VFAs/SCOD ratio reached 462.09 mg·L−1 and 3.16%, respectively, suggesting moderate potential for acidogenic conversion but limited suitability for methanogenesis. Fluorescence spectroscopy of dissolved organic matter revealed that microbial humic-like substances (C1) were the dominant fluorophore, accounting for 42.64% of the total fluorescence, followed by terrestrial humic-like (C2, 19.28%), fulvic-like (C3, 19.12%), and tryptophan-like (C4, 18.95%) components. The favorable C/N ratio of amino acids and humic substances supports the feasibility of composting. Additionally, trace levels of residual capsaicin may confer antibacterial benefits and enhance soil fertility, further supporting the potential of capsicum residue as a value-added resource. Full article
(This article belongs to the Special Issue Research on Resource Utilization of Solid Waste)
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