Jan Vymazal and Zhongbing Chen attended the International Symposium on Aquatic Ecological Degradation and Ecological Remediation, 15-18 November 2019, Guangzhou, China. This symposium was co-organized by Jinan University and CULS. Prof. Vymazal act as co-chair of the symposium, and he gave a presentation on “Wetland ecosystem services”. Zhongbing Chen gave a presentation on “Surplus sludge treatment in sludge treatment beds under subtropical condition in China”