The Hong Kong Harbour Area Treatment Scheme (HATS) serves a population of over 5 million. It ensures protection of the Tsuen Wan beaches and good water quality in Victoria Harbour. In the Stonecutters Island treatment works, 300 tonnes of 10 percent sodium hypochlorite solution (6 L/s) are dosed into a river of sewage (1.8 million m3/d) every day. In actual operation it is found that most of the chlorine is actually consumed without being used for disinfection. This talk presents an engineering innovation on how to mix the small chlorine dose with the large sewage flow, resulting in up to 30 percent reduction of chlorine demand – with significant savings of chemicals and reduction of carbon footprint of 1170 tonnes/year. The technology is generally applicable to chlorine disinfection of primary effluent in many developing countries.
Professor Lee is an internationally recognized expert in hydraulics – with a passion to apply fluid mechanics to solve complex water environment problems. He is the master mind of the Hong Kong WATERMAN coastal water quality management and forecast system. He is a past recipient of the Croucher Senior Research Fellowship, the ASCE Hunter Rouse Hydraulic Engineering Award and China State Scientific and Progress Award. He is Immediate Past President of the International Association for Hydro-environment Engineering and Research (IAHR) and a Fellow of the Royal Academy of Engineering and the Hong Kong Academy of Engineering Sciences. He was bestowed Honorary Fellow by the Hong Kong Institution of Engineers (HKIE) in 2023.
Clean water and clean air are vital for public health. This project focuses on developing high-efficiency and environmentally sustainable filters for removing harmful air/water pollutants. The team has developed novel architectures and functionalities for the filters to achieve high permeance, high removal efficiency, and excellent reusability.
