Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Recycling maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 21 days and the median time to publication was 55 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| A. Muñoz Sánchez, Jesús | Li, Yue |
| Abubakar, Ismaila | Li, Zheng |
| Almeida, Joana | Lima, Thiago De M |
| Álvarez, Esther | Lin, Tyrone T. |
| An, Chunjiang | Lopez, Felix A. |
| Anyszka, Rafał | Luidold, Stefan |
| Arredondo-Rea, Susana Paola | Luna, Diego |
| Avolio, Roberto | Luo, Shaojuan |
| Balagurusamy, Nagamani | Martikka, Ossi |
| Banias, Georgios | Martinho, Pedro |
| Barbudo, Auxi | Mashaan, Nuha |
| Behnood, Ali | Maurer, Claudia |
| Bernardi, Patrizia | Mija, Alice |
| Bockel, Louis | Mladenović, Goran M. |
| Bramer, Eddy A. | Nascimento, Luís Adriano Santos Do |
| Bufo, Sabino Aurelio | Navarro Domínguez, Francisco Javier |
| Caballero, María J. Arévalo | Nguyen, Van Bon |
| Cai, Jihua | Nicolini, Andrea |
| Camilleri, Mark Anthony | Nikolaev, Alexander |
| Cascardi, Alessio | Ojeda-Benitez, Sara |
| Chiampo, Fulvia | Onchoke, Kefa |
| Chiu, Chih-Wei | Onésippe, Cristel |
| Corder, Glen | Ostrowski, Krzysztof |
| Czekala, Wojciech | Pacheco, Élen Beatriz Acordi Vasques |
| D’Adamo, Idiano | Pereira, Manuel Francisco Costa |
| D’Arienzo, Massimiliano | Pillay, Sudhir |
| Dátka, Jerzy | Rabnawaz, Muhammad |
| De La Motte, Hanna | Rahman, Mizanur |
| Degirmenci, Volkan | Ramos-Suárez, Juan Luis |
| Dolinska, Silvia | Rezek Jambrak, Anet |
| Dragomir, Mihai | Rodríguez Liñán, Carmen |
| Du Plessis, Roelien | Saiano, Filippo |
| Du, Jia-Chong | Saidani, Michael |
| Dumbrava, Anca | Salhofer, Stefan Petrus |
| Ekielski, Adam | Santos, José Carlos Oliveira |
| Farnaud, Sebastien | Santos, Rafael |
| Ferreira, Ana Teresa Vaz | Schiavi, Pier Giorgio |
| Ferronato, Navarro | Schulz, Burkhard |
| Formela, Krzysztof | Secondi, Luca |
| Fu, Ming-Lai | Simoes, Pedro |
| Gao, Zhiyong | Simon, Franz-Georg |
| García-Alcaraz, Jorge Luis | Slodek, Aneta |
| Gentile, Gennaro | Smol, Marzena |
| Gewen, Yi | Soavi, Francesca |
| Glaser, John | Spinelli, Luciana |
| Golev, Artem | Stafford, Edwin |
| Gollakota, Anjani Ravi Kiran | Stauvermann, Peter Josef |
| Gómez Barrios, Xiomar | Stojmenović, Marija |
| Grădinaru, Catalina Mihaela | Streimikiene, Dalia |
| Hawrot-Paw, Małgorzata | Strzemiecka, Beata |
| He, Xiangming | Suchorzewski, Jan |
| Herckes, Pierre | Taha, Yassine |
| Hermoso-Orzáez, Manuel Jesús | Ten Hoor, Gill A. |
| Hernández-Ávila, Juan | Thoden Van Velzen, Ulphard |
| Hevus, Ivan | Tilley, Elizabeth |
| Hiejima, Yusuke | Trofimova, Maya |
| Hrabec, Dušan | Tsai, Wen-tien |
| Ibragimov, Ruslan | Tsikouras, Basilios |
| Igarashi, Go | Tursi, Antonio |
| Ionescu, Gabriela | Turskis, Zenonas |
| Işildar, Arda | Tutak, Magdalena |
| Jasiunas, Lukas | Ukalska-Jaruga, Aleksandra |
| Jin, Congrui | Um, Namil |
| Jørgensen, Bodil | Vadahanambi, Sridhar |
| Joshaghani, Alireza | Valente, Marco |
| Kairytė, Agnė | Vandewalle, Lucie |
| Kamberović, Željko | Vrsaljko, Domagoj |
| Kanari, Ndue | Wang, Wensheng |
| Kelly, Catherine | Williams-Wynn, Mark D. |
| Klavins, Maris | Włoch, Marcin |
| Konstantakopoulou, Fotini | Wojewnik-Filipkowska, Anna |
| Krzywonos, Małgorzata | Woodard, Ryan |
| Kurańska, Maria | Zamboni, Giorgio |
| Kurmus, Halenur | Zamparas, Miltiadis |
| La Mantia, Francesco Paolo | Zhao, Lingying |
| Lee, Man Seung | Zhao, Zengfeng |
| Lee, Maw Tien | Zhou, Ao |
| Lemos, Francisco | |
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