Apart from the academic activities, CEE has been contributing significantly in the development of professionals in water and waste management through ITN activities such as developing and offering training courses for professionals since 1997 under the linkage between ITN Bangladesh Center at BUET and SUST Sub-center. CEE faculty members have been actively involved in ‘Healthy City Program’ of Sylhet Paurashava since 1997. CEE faculty members have been conducting significant researches in the field of earthquake, water and waste water treatment specially removal of iron, arsenic, tannery waste, textile and dying waste, fertilizer waste, paper and pulp waste, pharmaceutical waste etc.; hill cutting; wet land issues; sanitation specially solid waste management and human waste management; water supply specially rainwater harvesting; environment impact assessment; environment management; geo-environmental engineering; biodiversity assessment; traffic management, transportation engineering; structural engineering etc. CEE department concentrated to basic research on appropriate technology based on locally available materials. A young research group of CEE department has invented a new technology to treat tannery waste using another waste without the application of chemical that has been found more effective and perform very successfully. Young CEE faculty members also invented the low cost technology for removing iron and arsenic using locally available natural ingredients without the application of chemicals. CEE department organized a National Conference on “Prospects of Environmental Engineering in Bangladesh” in August 10-11, 2001. CEE department has been taken part in the International ETP FAIR 2007 held in September 111 to 13, 2007 organized by DoE in BCFCC where the stall of CEE has been regarded as the best research exhibitor in the field effluent treatment processes. CEE department organized the “First International Conference on Indigenous People of Bangladesh and Environment” with Bangladesh Paribesh Andolon, Bangladesh Environmental Network (BEN) held in December 17-18, 2007 in the IEB Conference Centre. Moreover, CEE department is actively involved in research collaboration with the University of Portsmouth, UK since 2020 which is funded by GRCF (Global Challenges Research Fund, UK). This collaboration will allow the universities to exchange teachers, students and staff as well as potential research collaborative opportunities. Furthermore, an MoU (Memorandum of Understanding) was signed between CEE-SUST and Islamic Relief Bangladesh in 2020. The MoU will play an effective role in organizing joint research activities, training and capacity building programs, international conferences, internship programs, workshops, and seminars.