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Processes
Special Issues
Valorization of Wastes into Value-Added Products: Bioprocesses and Applications
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Valorization of Wastes into Value-Added Products: Bioprocesses and Applications

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

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 6813

Special Issue Editor

Dr. Bruno C. Marreiros

E-Mail Website
Guest Editor
UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologias, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Interests: valorization of by-products or waste streams; microbial bioprocesses; microbial biopolymers production; polyhydroxyalkanoate (PHA); biopolymers applications; bioenergetics; microbial diversity

Special Issue Information

Dear Colleagues,

A worldwide growing environmental awareness has triggered concerns about resource depletion and environmental degradation, which led to stricter regulation for waste treatment and disposal.

Wastes and by-products from Forestry, Agrofood and Fisheries industries are enriched with diverse biocompounds that are important sources of raw materials. Conversion of these materials into value-added products by eco-efficient bioprocesses is becoming prominent in our society and promoting a paradigm shift to a circular economy.

This Special Issue on “Valorization of Wastes into Value-added Products: Bioprocesses and Applications” seeks latest advances in the valorization of residues through the production of value-added products and cover novel technologies and applications from different areas by presenting original research papers and comprehensive reviews. Topics include, but are not limited to:

  • Bioprocesses for the valorization of wastes and industrial by-products;
  • Approaches to reduce bioprocess costs;
  • Bioprocess development and scale-up;
  • Waste biodegradation and upcycling using microbial communities.
  • Innovative applications of bio-based products;

Dr. Bruno C. Marreiros
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. Processes 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 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

  • agro-industrial byproducts
  • upcycling of waste
  • biorefinery
  • bioprocess optimization
  • bioprocess scale-up
  • value-added bioproducts
  • biopolymers
  • bioenergy
  • application of bioproducts
  • circular economy

Published Papers (1 paper)

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Research

18 pages, 2424 KiB  
Article
Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency
by Gustavo A. Figueroa Campos, Jeffrey Paulo H. Perez, Inga Block, Sorel Tchewonpi Sagu, Pedro Saravia Celis, Andreas Taubert and Harshadrai M. Rawel
Processes 2021, 9(8), 1396; https://0-doi-org.brum.beds.ac.uk/10.3390/pr9081396 - 12 Aug 2021
Cited by 28 | Viewed by 6087
Abstract
The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and [...] Read more.
The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investigated. The aim of this work was to prepare activated carbon from spent coffee grounds and parchment, and to assess their adsorption performance. The co-calcination processing with calcium carbonate was used to prepare the activated carbons, and their adsorption capacity for organic acids, phenolic compounds and proteins was evaluated. Both spent coffee grounds and parchment showed yields after the calcination and washing treatments of around 9.0%. The adsorption of lactic acid was found to be optimal at pH 2. The maximum adsorption capacity of lactic acid with standard commercial granular activated carbon was 73.78 mg/g, while the values of 32.33 and 14.73 mg/g were registered for the parchment and spent coffee grounds activated carbons, respectively. The Langmuir isotherm showed that lactic acid was adsorbed as a monolayer and distributed homogeneously on the surface. Around 50% of total phenols and protein content from coffee wastewater were adsorbed after treatment with the prepared activated carbons, while 44, 43, and up to 84% of hydrophobic compounds were removed using parchment, spent coffee grounds and commercial activated carbon, respectively; the adsorption efficiencies of hydrophilic compounds ranged between 13 and 48%. Finally, these results illustrate the potential valorization of coffee by-products parchment and spent coffee grounds into activated carbon and their use as low-cost adsorbent for the removal of organic compounds from aqueous solutions. Full article
(This article belongs to the Special Issue Valorization of Wastes into Value-Added Products: Bioprocesses and Applications)
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