The largest percentage of waste water (600,000 m3 per day, with about 250 tons of waste is discharged in the river area of Hanoi) and industrial (260,000 m3 and only 10% is processed) are not treated of which flow directly into the lake, then flows out the major rivers in the Red River Delta and Mekong River. In addition, many factories and production facilities as abattoirs and even hospitals (7,000 m3 per day, and only 30% is being processed) is not equipped with effluent treatment systems.
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