Treated effluent discharge study at Kai Tak Nullah and Kwun Tong typhoon shelter

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Treated effluent discharge study at Kai Tak Nullah and Kwun Tong typhoon shelter

 

Author: Fok, Chi-man Richard
Title: Treated effluent discharge study at Kai Tak Nullah and Kwun Tong typhoon shelter
Degree: M.Sc.
Year: 1997
Subject: Sewage -- Purification -- China -- Hong Kong -- Case studies
Water -- Pollution -- China -- Hong Kong -- Case studies
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: iv, 101 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1250474
URI: http://theses.lib.polyu.edu.hk/handle/200/323
Abstract: The water quality in the Kai Tak Nullah and Kwun Tong Typhoon Shelter is presently poor due, inter alia, to the discharge of untreated effluent into the areas which causes the water heavily contaminated with bacteria, heavy metals and other organic pollutants. The pollution creates health risks, causes deterioration in marine water quality and degrade the marine ecosystem. Recognizing the seriousness of the above pollution and avoiding further deterioration the water quality, the government had launched several measures. The most effective measure would be to direct effluent from the Shatin and Tai Po Sewage Treatment Works from the Tolo Harbour to Victoria Harbour via the Kai Tak Nullah. The increase inflow at the Kai Tak Nullah arising from the treated effluent discharge will have a flushing effect to the nullah and typhoon shelter and their existing pollution problems would be alleviated as well as the eutrophication of the Tolo Harbour, due to the increase of nutrient discharges by the intensive urbanization of new towns in Shatin and Tai Po, would be avoid. A finite element numerical model, two-dimensional and vertically averaged, was implemented to assess the potential impact of this Tolo Harbour Effluent Export Scheme (THEES) to the Kai Tak Nullah and Kwun Tong Typhoon Shelter. The model takes into account the effects of boundary conditions, tidal diurnal change and continuous treated effluent discharge and wave attenuation. Accurate time dependent solutions of the of water elevations, tidal velocities and pollutant dispersion were given. Simulation results of the conservative and non-conservative pollutants dispersion are comparable to the analytical predictions. Further development of the model with the inclusion of flooding capability and wind-induced mixing would improve the model prediction of pollutant dispersion, particular over the shallow region. To develop the 2-D model into 3-D model should be the next stage of research studies.

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