The city of Hong Kong has a dual watersupply system that pro

The city of Hong Kong has a dual water-supply system that provides freshwater for drinking and bathing, and salt water for flushing toilets. At the Hong Kong wastewater
treatment plant, as in most other wastewater treatment plants, wastewater is passed through a primary clarifier to settle out suspended solids. The Hong Kong plant achieves
greater removal in their primary clarifier than most plants elsewhere in the world. Why?

Solution

The city of hongkong is near sea region. The seawater increases the electrial conductivity of water and there by act as a coagulant, enhancing the efficiency of sedimentation process (setting is achieved within less time).

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