Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Recycling was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 20.5 days and the median time to publication was 52.5 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Adhikari, Sanjeev | Lima, Thiago |
| Aleksanyan, Kristine V. | Liu, Gang |
| Alexey, Safonov | Liu, Shumei |
| Altarawneh, Mohammednoor Khalil | Liu, Yiyun |
| Andreeva, Tonya | Liu, Yupeng |
| Antunes, Vítor | Liu, Zhe |
| Apostolidis, Panos | Loganina, Valentina |
| Ardolino, Filomena | Lu, Wenjing |
| Argumedo-Delira, Rosalba | Lyu, Tao |
| Ayalon, Ofira | Mainardis, Matia |
| Babafemi, A. J. | Marinello, Samuele |
| Bąbelewski, Przemysław | Marín-Genescà, Marc |
| Barbi, Silvia | Martinho, Fernando C. G. |
| Beata, Zima | Mashaan, Nuha |
| Belmonte, Marisol | Masi, Fabio |
| Bhat, Sartaj Ahmad | Medina-Gallego, Juan |
| Bhatt, Anand | Mikalef, Patrick |
| Biancardo, Salvatore Antonio | Mirković, Miljana |
| Boer, Jan Den | Mironova, Maria |
| Bolton, Kim | Mišić, Milan |
| Bolzan, Ariovaldo | Monte, M. C. |
| Borowicz, Marcin | Morseletto, Piero |
| Borowski, Piotr F. | Munir, Muhammad Junaid |
| Brylev, Oleg A. | Muñoz, Jesús A. |
| Butturi, Maria Angela | Nagalli, André |
| Camões, Aires | Nęcka, Krzysztof |
| Campos, José Luis | Nikolaev, Alexander |
| Candau, Nicolas | Nunes, Nuno |
| Capitão, Silvino Dias | Ojeda-Benitez, Sara |
| Cascardi, Alessio | Paolini, Valerio |
| Cavalline, Tara | Parcheta, Paulina |
| Chen, Chin-Chao | Partyka, Monika |
| Chen, Feiyu | Passaro, Renato |
| Chen, Wan-Ting | Pehlken, Alexandra |
| Chung, Kyeong Woo | Pellegrini, Marco |
| Cieslar, Miroslav | Penteado, Carmenlucia |
| Coates, Stephen | Perse, Lidija Slemenik |
| Cozzarini, Luca | Petrus, Rafał |
| Croitoru, Cătălin | Phanthong, Patchiya |
| Cuevas-García, Rogelio | Pietrzyk, Stanisław |
| D’Adamo, Idiano | Pizoń, Jan |
| Danilevicz, Ângela De Moura Ferreira | Proto, Andrea |
| Davis, John-Michael | Purcar, Marius |
| De Blasio, Cataldo | Pushkar, Svetlana |
| De Medeiros, Ricardo | Quattrone, Marco |
| Deleanu, Lorena | Ragazzi, Marco |
| Dhawan, Nikhil | Rahier, Hubert |
| Dias, Pablo Ribeiro | Rahman, S.M. Mizanur |
| Ding, Tianpeng | Rapa, Mattia |
| Doddapaneni, Tharaka Rama Krishna Chowdary | Ray, Priyanka |
| Drillet, Jean-François | Remmas, Nikolaos |
| Du, Jia-Chong | Ricciardi, Maria |
| Eberhardsteiner, Lukas | Roh, Changhyun |
| Eliášová, Martina | Rojas Valencia, María Neftalí |
| Ferronato, Navarro | Rucinska, Teresa |
| Filipova, Inese | Rutkowska, Gabriela |
| Fogarty, Timothy | Santos, Ana Rita |
| Gavriletea, Marius Dan | Sarkar, Biswajit |
| Gewen, Yi | Schiavi, Pier Giorgio |
| Gil, M.L.A. | Secondi, Luca |
| Goh, Guo Dong | Sekiguchi, Yu |
| Gomes, Joao F | Settembre Blundo, Davide |
| González, Israel | Shafique, Muhammad |
| Gorte, Raymond J. | Shaw, Pete |
| Gradel, Alexander | Shekoohiyan, Sakine |
| Gray, Tim | Shirvani Moghaddam, Kamyar |
| Guo, Jianfeng | Shooshtarian, Salman |
| Guo, Weihong | Silva, Lucio Camara E. |
| Haddad, Assed N. | Šišková, Alena |
| Han, Kenneth N. | Small, Gaston E. |
| Han, Tae Uk | Sobczak, Paweł |
| Hanif, Asad | Soco, Eleonora |
| Hao, Jianli | Spinelli, Luciana |
| Hariri-Ardebili, Mohammad Amin | Stamatelatou, Katerina |
| Hawrot-Paw, Małgorzata | Stehlíková, Beáta |
| He, Meiling | Stocchino, Alessandro |
| Hejna, Aleksander | Suchorzewski, Jan |
| Hu, Jiugang | Sun, Yuantian |
| Huang, Wu-Jang | Szamałek, Krzysztof |
| Iacovidou, Eleni | Tang, Naipeng |
| Ihsanullah, Ihsanullah | Tayeh, Bassam |
| Isopescu, Dorina Nicolina | Tazi, Nacef |
| Iwaszko, Jozef | Téllez-Téllez, Maura |
| Jagodzinska, Katarzyna | Ten Hoor, Gill A. |
| Jezierski, Jan | Thoden Van Velzen, Ulphard |
| Jiang, Jianhua | TOMA, Ionut Ovidiu |
| Jindo, Keiji | Torres Vaamonde, José Enrique |
| Kairytė, Agnė | Tseng, Ming-Lang |
| Kang, Dongho | Tursi, Antonio |
| Karasali, Helen | Uddin, Md. Nizam |
| Kärenlampi, Petri | Vakili, Mohammadtaghi |
| Kaseer, Fawaz | Valerio, Oscar |
| Kazmi, Syed Minhaj Saleem | Velić, Natalija |
| Khlyustova, Anna | Vlachokostas, Christos |
| Kim, Junbeum | Wang, Wensheng |
| Kim, Taek-Soo | Warshawsky, Daniel N. |
| Kinuthia, John | Welle, Frank |
| Kircher, Manfred | Woolridge, Anne Christine |
| Knop, Yaniv | Woon, Kok-Sin |
| Kontogiannopoulos, Konstantinos | Wróbel, Marek |
| Kornél, Németh | Wu, Shusen |
| Korniejenko, Kinga | Xiao, Yue |
| Kostjuk, Sergei V. | Xu, Ben B. |
| Kozyatnyk, Ivan | Xu, Gang |
| Kruja, Alba | Ylä-Mella, Jenni |
| Kusch-Brandt, Sigrid | Yu, Bo |
| Kvasha, Andriy | Zaini, Ilman Nuran |
| Labianca, Claudia | Zechel, Stefan |
| Latini, Arianna | Zedler, Łukasz |
| Lee, Chih-Hao | Zglobicka, Izabela |
| Lee, Chul-Hee | Zhang, Chao |
| Lemos, Maria Amélia N.D.A. | Zhang, Runxiao |
| Li, Aimin | Zhao, Yaqian |
| Li, Yongxiu | Zhou, Qingji |
| Li, Yue | Zinoveev, Dmitry |
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