Author: Xijie Huang, M.S. student
InstructorProf. Linhai
Communication UnitSchool of Energy and Environmental Engineering, University of Science and Technology Beijing
DOI. https://doi.org/10.1016/j.jece.2023.109650
✦Results Profile✦
Recently, Xijie Huang, a master's student in the group, published an article entitled "Improving sludge settling performance of secondary settling tank and simultaneously adsorbing nitrate and phosphate with surfactant modified zeolite (SMZ) ballasted flocculation" in the Journal of Environmental Chemical Engineering (JECE). The article entitled "Improving sludge settling performance of secondary settling tank and simultaneously adsorbing nitrate and phosphate with surfactant modified zeolite (SMZ) ballasted flocculation" was published in the Journal of Environmental Chemical Engineering (JECE). In this study, natural zeolite was modified with surfactant cetyltrimethylammonium bromide to investigate the effect of modified zeolite (SMZ) on the sludge settling performance of secondary settling tank and simultaneous adsorbing nitrate and phosphate removal, and to explore the intrinsic mechanism of SMZ to promote the sludge settling performance.
✦ Abstract✦
The poor settling performance of activated sludge limits the capacity of municipal wastewater treatment plants, on the other hand, the excessive discharge of nitrogen and phosphorus will further aggravate the eutrophication of water bodies, and the existing ballast agents do not have the ability to promote the improvement of sludge settling performance and adsorb nitrate and phosphate at the same time. In this study, surfactant modified natural zeolite (SMZ) was used as a new ballast agent to improve the settling performance of activated sludge and adsorb nitrate and phosphate at the same time. The results of sludge settling experiments showed that SMZ with 75-150 μm particle size promoted the best sludge settling effect, and the regional settling velocity (ZSV) of sludge increased to 3.81 m/h, which improved to 2.11 times of the original sludge. Microscopic observation, floc size determination and density test results showed that finer particle size SMZ facilitated the formation of larger and denser flocs, thus promoting sludge settling. The SMZ increased the sludge settling rate to more than twice of the original sludge, while removing 47.05 of nitrate % and 53.25% of phosphate. This study is expected to provide useful information for the upgrading of municipal wastewater treatment plants.
✦ Author✦
Xijie Huang, a master's degree student in environmental engineering from University of Science and Technology Beijing, Class of 2020, is engaged in the development of environmental functional materials and nitrogen and phosphorus pollution control of water bodies. He is responsible for the research and development of sludge settling and effluent water quality improvement technology of secondary sedimentation tank, and participated in projects such as Dongying groundwater environmental condition investigation and assessment project and Beijing drinking water source pollution source investigation. Finally, congratulations again to Huang Xijie, a master's student, and wish the graduate students in the group to keep innovating, to make further efforts and to achieve fruitful results!
Source: Environmental Biotechnology and Environmental Materials Development Team Public
EN 
CN 
RU