Ngong Ping is located on Lantau Island, the most important outlaying island of Hong Kong that is home to the famous Hong Kong Internatonal Airport and Asia's longest cable car system. Sewage discharge on Ngong Pong relied on distributed septic tanks and soakway systems that imposed severe limitations on the sewage flow that could be handled.

2.6 billion people all over the world lack adequate toilets and hygiene facilities. Good sanitation ensures public health and contributes to economic development by preventing loss of human days caused by ill health and deaths due to diseases like jaundice, cholera and diarrhoea.

Aquatic macrophytes in domestic wastewater treatment is receiving growing attention over last few years. Duckweed-based pond system my be a feasible option for organic matter and nutrient removal, particularly for country, like India where sunshine is available in plenty for photosynthesis.

Disinfection is a primary means to destroy/inactive waterborne pathogenic bacteria that could spread diseases in human. Disinfection process is a must in drinking water treatment, and we are all aware of this. In wastewater treatment, disinfectant process is equally important.

Worldwide, cities and townships are facing many complex wastewater treatment issues. Although centralized sewers are seen as a preferred solution to wastewater problems, areas with centralized sewers discharding to surface waters, have been identified as source of many pollution problems. Lack of sufficient, even basic treatment is a risk to public health.

Two billion tons of human and animal waste and industrial pollution are dumped into waterways every day around the world, according to reports released in Nairobi, Kenya, for the 17th annual World Water Day