Log in
Business

Water cleaning method shown to be limited

Hanoi Times - Three months after young scientists of Hoa Lac High Tech Park used LTH 100 to clean the water of Van Lake in Hanoi, scientists have raised doubts about the effectiveness of the chemical substance.The scientists affirm that the method which has been used for Van Lake cannot be used for other lakes or it will damage biological diversification and kill endemic organisms.Associate Prof Dr Le Van Cat, a chemist from the Vietnam Institute of Sciences and Technologies, said that he applauded the idea by the team of young scientists to clean the water of Van Lake but he ‘does not highly rate LTH 100 as a substance to clean water’, and that he can identify thirty substances with can be used for the same purpose.“There are a lot of substances which can kill seaweed. In swimming pools, seaweed is killed with sulfate. LTH 100 is like any other pasteurised substance,” Cat said, adding that the method of cleaning water at Van Lake is, in fact, a kind of killing seaweed.“Seaweed can float right after dying, but it will fall to the bottom of a lake if people do not remove it soon enough. The young scientists, I think, tried to remove the seaweed right after it died. However, how could we be sure they removed the seaweed before it fell to the bottom of the lake?” Cat asked.Cat also denied the fact that LTH 100 can oxygenate organic substances, get rid of nitrogen, phosphorus and heavy metals as the young scientists said, emphasising that no tool can do all those things. Meanwhile, Duong Duc Tien, PhD from Hanoi National University, said that if drastic measures were taken, Van Lake could become so clean that its bottom could be seen. However, he said that the value of the lake, as well as other lakes, is in its diversified ecosystem, and that cleaning the water of the lake does not mean turning the lake into a swimming pool.Ha Dinh Duc, who has been famous for his researches o­n tortoises, is worried about if the young scientists learnt before about the historical characteristics of Van Lake. Duc said that every lake has its own characteristics and biological diversification which the current generation still cannot assess. It took hundreds or thousands of years for the current ecosystem of Van Lake today to be formed, but the ecosystem could be destroyed in a day.Prof Dr Dang Dinh Kim, Deputy Head of the Science and Technology Institute under the Vietnam Institute for Sciences and Technologies, also affirmed that LTH 100 must not be used to clean the water of all lakes in Hanoi. Kim and his colleagues said that the announcement by a deputy minister of science and technology recently that LTH 100 would be used to clean the water of To Lich River proves to be a hasty announcement.

Hanoi Times - Three months after young scientists of Hoa Lac High Tech Park used LTH 100 to clean the water of Van Lake in Hanoi, scientists have raised doubts about the effectiveness of the chemical substance.



The scientists affirm that the method which has been used for Van Lake cannot be used for other lakes or it will damage biological diversification and kill endemic organisms.
Associate Prof Dr Le Van Cat, a chemist from the Vietnam Institute of Sciences and Technologies, said that he applauded the idea by the team of young scientists to clean the water of Van Lake but he ‘does not highly rate LTH 100 as a substance to clean water’, and that he can identify thirty substances with can be used for the same purpose.
“There are a lot of substances which can kill seaweed. In swimming pools, seaweed is killed with sulfate. LTH 100 is like any other pasteurised substance,” Cat said, adding that the method of cleaning water at Van Lake is, in fact, a kind of killing seaweed.
“Seaweed can float right after dying, but it will fall to the bottom of a lake if people do not remove it soon enough. The young scientists, I think, tried to remove the seaweed right after it died. However, how could we be sure they removed the seaweed before it fell to the bottom of the lake?” Cat asked.
Cat also denied the fact that LTH 100 can oxygenate organic substances, get rid of nitrogen, phosphorus and heavy metals as the young scientists said, emphasising that no tool can do all those things.
Meanwhile, Duong Duc Tien, PhD from Hanoi National University, said that if drastic measures were taken, Van Lake could become so clean that its bottom could be seen. However, he said that the value of the lake, as well as other lakes, is in its diversified ecosystem, and that cleaning the water of the lake does not mean turning the lake into a swimming pool.
Ha Dinh Duc, who has been famous for his researches o­n tortoises, is worried about if the young scientists learnt before about the historical characteristics of Van Lake. Duc said that every lake has its own characteristics and biological diversification which the current generation still cannot assess. It took hundreds or thousands of years for the current ecosystem of Van Lake today to be formed, but the ecosystem could be destroyed in a day.
Prof Dr Dang Dinh Kim, Deputy Head of the Science and Technology Institute under the Vietnam Institute for Sciences and Technologies, also affirmed that LTH 100 must not be used to clean the water of all lakes in Hanoi. 
Kim and his colleagues said that the announcement by a deputy minister of science and technology recently that LTH 100 would be used to clean the water of To Lich River proves to be a hasty announcement.

 

Reactions:
Share:
Trending
Most Viewed
SSC launches Vietnam Governance Manual 2025

SSC launches Vietnam Governance Manual 2025

Vietnam targets 100% online processing of business-related procedures

Vietnam targets 100% online processing of business-related procedures

By 2026, corporate compliance costs must be halved compared to 2024, achieved through a 50% reduction in processing times.

Vietnam aims to create one million new businesses by 2030

Vietnam aims to create one million new businesses by 2030

Ministries and local governments are expected to cut at least 30% of processing times, compliance costs, and unnecessary business conditions this year.

Hanoi advances energy efficiency for businesses

Hanoi advances energy efficiency for businesses

Hanoi authorities, in collaboration with relevant agencies, are providing technical support to businesses in adopting advanced energy-saving technologies and developing energy efficiency indices.

Vietnamese spend US$13 million daily on coffee and tea

Vietnamese spend US$13 million daily on coffee and tea

Total revenue for the F&B industry is expected to reach VND755.4 trillion ($29.6 billion) this year.

Vietnam works to overcome US seafood export barriers

Vietnam works to overcome US seafood export barriers

Vietnam’s seafood industry is facing new trade barriers from the US under the Marine Mammal Protection Act (MMPA), which aims to reduce bycatch and promote sustainable fishing.

New IPO rules in Vietnam: How startups can raise capital faster?

New IPO rules in Vietnam: How startups can raise capital faster?

Unlocking capital flows would be crucial for the sustainable development of Vietnam's startup ecosystem.

Viettel to open new data center in Ho Chi Minh City next month

Viettel to open new data center in Ho Chi Minh City next month

Expected to be operational by 2026, the center will play a critical role in meeting the data storage and processing needs of southern Vietnam.