1. Production and Application of Lignin-Based Chemicals and Materials in the Cellulosic Ethanol Production: An Overview on Lignin Closed-Loop Biorefinery Approaches

   • Carlos Eduardo de Araújo Padilha
   • Cleitiane da Costa Nogueira
   • Everaldo Silvino dos Santos

   Review 27 April 2021 Pages: 6309 - 6337

   

2. Natural Quinone Dyes: A Review on Structure, Extraction Techniques, Analysis and Application Potential

   • Benson Dulo
   • Kim Phan
   • Steven De Meester

   Review Open access 10 May 2021 Pages: 6339 - 6374

   

3. A Brief Overview on the Utilization of Biomass Ash in Biogas Production and Purification

   • Seyedeh Azadeh Alavi-Borazjani
   • Luís A. C. Tarelho
   • Isabel Capela

   Review 05 May 2021 Pages: 6375 - 6388

   

4. Impact of Atmosphere on Recovered Carbon Fibers From Poly Ether Ether Ketone (PEEK) Based Composites During Thermoconversion

   • P. Fontaine
   • E. Weiss-Hortala
   • Y. Soudais

   Original Paper 08 May 2021 Pages: 6389 - 6402

   

5. Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

   • Marita Pigłowska
   • Beata Kurc
   • Łukasz Rymaniak

   Original Paper Open access 15 May 2021 Pages: 6403 - 6422

   

6. Study of Recycling Potential of FFP2 Face Masks and Characterization of the Plastic Mix-Material Obtained. A Way of Reducing Waste in Times of Covid-19

   • Cristina Crespo
   • Gemma Ibarz
   • Sandra Roche

   Short Communication 31 May 2021 Pages: 6423 - 6432

   

7. Recycling Natural Fibre to Superabsorbent Hydrogel Composite for Conservation of Irrigation Water in Semi-arid Regions

   • Abhisekh Saha
   • Chandra Bhanu Gupt
   • Sreedeep Sekharan

   Original Paper 03 June 2021 Pages: 6433 - 6448

   

8. Sustainable Development of Particulate Reinforced Composites by Recycling Marble Waste for Advanced Construction Applications: Ultra-low Water Absorption, Remarkable Thermal and Mechanical Behaviour

   • Payal Bakshi
   • Asokan Pappu
   • Manoj Kumar Gupta

   Original Paper 15 May 2021 Pages: 6449 - 6464

   

9. Thermal Behavior, Reaction Pathways and Kinetic Implications of Using a Ni/SiO₂ Catalyst for Waste Tire Pyrolysis

   • Paula Osorio-Vargas
   • Ileana D. Lick
   • Luis E. Arteaga-Pérez

   Original Paper 06 June 2021 Pages: 6465 - 6479

   

10. Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

    • Gábor Mucsi
    • Nóra Halyag
    • Ferenc Kristály

    Original Paper Open access 15 May 2021 Pages: 6481 - 6495

    

11. A Humins-Derived Magnetic Biochar for Water Purification by Adsorption and Magnetic Separation

    • C. Lomenech
    • Ch. Hurel
    • P. Kuzhir

    Original Paper 11 June 2021 Pages: 6497 - 6512

    

12. Quantification of Classified Nickel Species in Spent FFC Catalysts

    • Monica Dapiaggi
    • Marco Alloni
    • Giorgia Confalonieri

    Research Article Open access 12 May 2021 Pages: 6513 - 6521

    

13. Offshore Conceptual Plastic Waste Collection and Treatment Towards Clean Ocean

    • Vlastimír Nevrlý
    • Radovan Šomplák
    • Vít Procházka

    Original Paper 31 May 2021 Pages: 6523 - 6541

    

14. Mechanism Investigation of Excess Sludge Disintegration by Stirred Ball Mill—Utilized Transmission Electron Microscope Observation and Peptidoglycan Concentration Determination

    • Sai Yao
    • Feng Ma
    • Tong Zhu

    Original Paper 03 June 2021 Pages: 6543 - 6554

    

15. Acid-Induced Phosphorus Release from Hydrothermally Carbonized Sewage Sludge

    • Carla Pérez
    • Jean-François Boily
    • Jerker Fick

    Research Article Open access 16 May 2021 Pages: 6555 - 6568

    

16. Modeling as a Tool for the Optimal Design of a Downdraft Gasifier Operating on Waste Feedstock

    • Samira Lotfi
    • Jennifer Littlejohns
    • Luis Luque

    Original Paper 14 June 2021 Pages: 6569 - 6589

    

17. Management of Pelagic Sargassum spp. Landings to Atlantic Coastlines Through Direct Combustion and Further Synthesis of Highly Pure Calcium Carbonate Using the Residual Ashes

    • L. Chávez-Guerrero
    • A. Toxqui-Terán
    • M. Lara-Banda

    Short Communication 14 May 2021 Pages: 6591 - 6599

    

18. Separation of Vitexin and Iso-vitexin from Mung Bean Seed Coats Using a Three-Zone Simulated Moving Bed (SMB)

    • Sirawee Maneewan
    • Preuk Tangpromphan
    • Attasak Jaree

    Original Paper 12 June 2021 Pages: 6601 - 6618

    

19. Lab-Scale Combustion of High-Moisture Fuels From Peat, Coal Waste and Milled Lignite

    • Ksenia Vershinina
    • Galina Nyashina
    • Pavel Strizhak

    Original Paper 10 June 2021 Pages: 6619 - 6634

    

20. Mechanical Characteristics and Energy Consumption of Solid and Hollow Biomass Pellet Production Using a Statistical Analysis of Operating Parameters

    • Mohamed E. Mostafa
    • Yufei Zhang
    • Jun Xiang

    Original Paper 06 May 2021 Pages: 6635 - 6657

    

21. The Microbial Devulcanisation of Waste Ground Tyre Rubber Using At. ferrooxidans DSMZ 14,882 and an Unclassified Sulphur-Oxidising Consortium

    • Kathryn Mary Allan
    • Oscar K. K. Bedzo
    • Johann F. Görgens

    Original Paper 10 May 2021 Pages: 6659 - 6670

    

22. Valorization of Algerian Saffron: Stigmas and Flowers as Source of Bioactive Compounds

    • Larbi Belyagoubi
    • Bouchra Loukidi
    • Fawzia Atik-Bekkara

    Original Paper 11 May 2021 Pages: 6671 - 6683

    

23. Sour Cherry Kernel as an Unexploited Processing Waste: Optimisation of Extraction Conditions for Protein Recovery, Functional Properties and In Vitro Digestibility

    • Kadriye Nur Kasapoğlu
    • Evren Demircan
    • Beraat Özçelik

    Original Paper 08 May 2021 Pages: 6685 - 6698

    

24. In-Vivo Anti-anaemic Effects of Bioactive Compounds Prepared from Chicken Liver Using Biotechnological Tools

    • Ashok Kumar Chakka
    • Jini Ramanatikara
    • Bhaskar Narayan

    Research Article 07 May 2021 Pages: 6699 - 6708

    

25. Statistical Optimization of Poly-β-Hydroxybutyrate Biosynthesis Using the Spent Mushroom Substrate by Bacillus tequilensis PSR-2

    • Kanagavel Susithra
    • Kannan Badri Narayanan
    • Kaniappan Rajarathinam

    Original Paper 06 May 2021 Pages: 6709 - 6725

    

26. Valorization of Peach Palm (Bactris gasipaes Kunth) Waste: Production of Antioxidant Xylooligosaccharides

    • Tatiane Francielli Vieira
    • Rúbia Carvalho Gomes Corrêa
    • Rosane M. Peralta

    Original Paper 06 May 2021 Pages: 6727 - 6740

    

27. Immersion Effect on the Anaerobic Degradation and the Rheological Properties of Straw-Cattle Manure (SCM) at 440 L Batch Pilot Scale Reactor

    • M. A. Hernández-Shek
    • L. André
    • T. Ribeiro

    Original Paper 05 May 2021 Pages: 6741 - 6758

    

28. Growth Performance and Survival in the Crayfish (Astacus astacus) Fed Fish Faeces, Combined Plant Root/Fish Faeces and a Commercial Pelleted Fish Feed

    • Stephan S. W. Ende
    • Vanessa Fuchs
    • Joachim Henjes

    Original Paper 01 May 2021 Pages: 6759 - 6766

    

29. Demand-Driven Biogas Production from Anaerobic Digestion of Sewage Sludge: Application in Demonstration Scale

    • Mauro Lafratta
    • Rex B. Thorpe
    • Jacquetta Lee

    Original Paper Open access 01 May 2021 Pages: 6767 - 6780

    

30. Chemical Characterization and In Vitro Bioactivity of Apple Bark Extracts Obtained by Subcritical Water

    • Jaroslava Švarc-Gajić
    • Víctor Cerdà
    • Annick Boeykens

    Original Paper 24 May 2021 Pages: 6781 - 6794

    

31. Bioconversion of Feather Composts using Proteolytic Bacillus mycoides for their Possible Application as Biofertilizer in Agriculture

    • Goldy Primo Beryl
    • Basheer Thazeem
    • Kathirvel Preethi

    Original Paper 18 May 2021 Pages: 6795 - 6809

    

32. Mouse Bioassay Acute and Subchronic Safety Assessment of Biomass from Swine Wastewater Phycoremediation

    • William Michelon
    • Aline Viancelli
    • Alexandre Matthiensen

    Original Paper 16 May 2021 Pages: 6811 - 6822

    

33. Feasibility of Nitrogen-Enriched Chars as Circular Fertilizers

    • Riikka Keskinen
    • Johanna Nikama
    • Kimmo Rasa

    Original Paper Open access 22 May 2021 Pages: 6823 - 6833

    

34. Green Energy from Discarded Wool and Fish Scales

    • Prajwal Battampara
    • Deepak Ingale
    • Narendra Reddy

    Original Paper 25 May 2021 Pages: 6835 - 6845

    

35. Sustainable Production, Optimization, and Partial Characterization of Exopolysaccharides by Macrococcus brunensis

    • Sarmad Ahmad Qamar
    • Muhammad Asgher
    • Muhammad Bilal

    Original Paper 25 May 2021 Pages: 6847 - 6859

    

36. Towards PHA Production from Wastes: The Bioconversion Potential of Different Activated Sludge and Food Industry Wastes into VFAs Through Acidogenic Fermentation

    • Gabriela Montiel-Jarillo
    • Teresa Gea
    • María Eugenia Suárez-Ojeda

    Original Paper 26 May 2021 Pages: 6861 - 6873

    

37. Production of Levulinic Acid from Coconut Residues (Cocos nucifera) Using Differents Approaches

    • Cláudio Carneiro Santana Junior
    • Michele Cristiane Diel Rambo
    • Magale Karine Diel Rambo

    Short Communication 01 June 2021 Pages: 6875 - 6886

    

38. Valorization of Waste Apple Pomace for Production of Platform Biochemicals: A Multi-Objective Optimization Study

    • Oseweuba Valentine Okoro
    • Lei Nie
    • Amin Shavandi

    Original Paper 01 June 2021 Pages: 6887 - 6901

    

39. Valorisation of Agricultural Digestate for the Ammonium Sulfate Recovery and Soil Improvers Production

    • Federico Battista
    • Chiara Masala
    • David Bolzonella

    Original Paper Open access 04 June 2021 Pages: 6903 - 6916

    

40. Genomic Insights Driven Statistical Optimization for Production of Efficient Cellulase by Himalayan Thermophilic Bacillus sp. PCH94 Using Agricultural Waste

    • Vikas Thakur
    • Vijay Kumar
    • Dharam Singh

    Original Paper 05 June 2021 Pages: 6917 - 6929

    

41. Nutrient Removal from Dairy and Poultry Wastewater with Simultaneous Biomass and Biodiesel Production by Chlorella sp. T4 Isolated from a Freshwater Stream in South Africa

    • S’fiso Thuthukani Gumbi
    • Taurai Mutanda
    • Ademola O. Olaniran

    Original Paper 08 June 2021 Pages: 6931 - 6943