Application of environmentally friendly technology to control canal water quality at Ton Duc Thang University
The level of urban development in District 7, Ho Chi Minh City has had a great impact on the quality of the environment in recent years, particularly has caused water pollution in canal systems in the area: including those going past Zone I and II of TDTU. High-nutrient domestic wastewater from nearby residential areas discharged into the canal system has resulted in pollution. It can be caused by sedimentation process, anaerobic decomposition which produces stinky odors, rapid growth of algae covering water surface which reduces oxygen diffusion, especially in hot and dry seasons. At TDTU, the installation of gas supply system with surface-spraying beam vertically along the canal to control eutrophication as a solution having been adopted for the past 5 years has contributed to the diversity of community activities.
In addition to the landscaping and aesthetics function of the canal surface, the system serves as a small scale sewage plant, minimizing pollution and dramatically improving water resources by ensuring balanced oxygen, nutrients and temperature throughout the region, and significantly reducing the development of algae, insect pests and odors.
Another sustainable ecological solution having been implemented is the process of raising and taking care of grass carps, sesame, tilapia, gold fish, etc. in the channel in order to control the growth of seaweed, algae and improve water quality. Together with the implementation of effective measures, controlling the number of fish corresponding with water surface area is necessary to avoid natural ecosystem destruction and imbalance.