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Hanoi starts treating its stinky river with Japan's bio-nanotechnology
Trung Kien 23:37, 2019/05/16
To Lich flowing in the middle of Hanoi used to be an icon of the city for its beauty in the old times, but it has become black and stinky due to untreated wastewater.
The To Lich river clean up project using Japanese bio-nanotechnology equipment was launched in Hanoi on May 16, local media reported.

At the launching ceremony, Nhat Viet Environment Improvement Joint Stock Company conducted a pilot installation of equipment with super-fast processing speed in the To Lich river. The company has been assigned to carry out the Japanese-funded project.
 
A pilot installation of equipment with super-fast processing speed will be conducted in To Lich river. Photo: Binh Ngoc
A pilot installation of equipment with super-fast processing speed will be conducted in To Lich river. Photo: Binh Ngoc
The technology includes nanotechnology aeration using natural substances which the Japanese side has surveyed for two years before piloting it. The nano aeration system uses a specially-designed filter technology to extract air directly from the environment and then diffuse into the water in the form of nano-sized air bubbles.

The diffusion of nano-sized air bubbles in the water increases the dissolved oxygen content in the treated water area, including groundwater. As a result, aerobic microorganisms will be activated and natural metabolic processes will be nourished, the final nutrition chain will be improved. Recovering the nutrient chain will improve the water quality in a short time.

Japanese experts said that by using bio-nano technology with super-fast processing speed in three days, the river’s bad smell will be reduced. They hope that this technology will actively support Vietnam in wastewater treatment.
 
With this project, To Lich river is expected to become clean again and to be transformed into a new destination for visitors to Hanoi. Photo: Binh Ngoc
With this project, To Lich river is expected to become clean again and to be transformed into a new destination for visitors to Hanoi. Photo: Binh Ngoc
This project attracts great public interest. Nguyen Thu Toan, a person living near To Lich river said that he and his relatives are happy to hear about this project. "If the To Lich river becomes clean again, every Hanoi’s residents will be so happy," Toan said.

To Lich flowing in the middle of Hanoi used to be an icon of the city for its beauty in the old times, but it has become black and stinky due to untreated wastewater.

Currently, the river’s water looks black and gives off a bad odor. Especially, its water contains many kinds of toxic heavy metals with the concentrations at ten times higher than the allowed level.

Everyone hopes that Japan’s modern technology can thoroughly treat the polluting elements in the To Lich river. 
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