70% of Hanoi's lakes treated by biotechnology
VTV.vn - The treatment of polluted water and landscape improvement have been attracting a lot of attention in Hanoi and in other big cities.
According to Hanoi City’s authorities, more than 100 lakes were polluted in 2015. However, the water of 70% of the lakes in Hanoi have been successfully treated thanks to biotechnology. These types of waste are difficult to be treated and are the main cause of clogged drains.
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