Hanoi: Cleaning lake water with internal technology

On June 25, Ho Van with Kim Chau Island is famous in history books and is an indispensable part of the architectural complex of Van Mieu - Quoc Tu Giam historical and cultural relics, Hanoi for the first time. clean with new technology.

It is an environmentally friendly chemical technology researched and implemented by a group of young scientists from Hoa Lac High-Tech Business Incubator (Nursery).

In the morning of June 25, for the first time, Hanoi people witnessed the clean-up of Lake Van water, which has been famous for many years about pollution.

After mixing the lake water and the LTH 100 microbial product into a white solution, people use a hand pump to spray this water over the lake surface.

The solution has a slightly pungent and sour odor, after spraying it works to clean lake water, eliminate bad odors, precipitate heavy metals, handle organic substances. According to Mr. Nguyen Phu Tuan, Head of the research team on the active ingredients for environmental treatment, nurseries and heavy metals, the most difficult to handle is Chromium 6 which is also reduced to 99%.

Precipitated heavy metals will settle to lake bottom sediments. Most importantly, all toxic algae causing rot and pollution of lake water will be destroyed. The whole lake needs about 300l of chemicals, equivalent to 60 million VND. This is considered the cheapest cost possible to handle the lake with this technology, compared to the price of VND 400 million if handled by foreign technology.

Cleaning lake water by environment-friendly chemical technology on June 25 (Photo: MH)

In front of Van lake, two lakes of Ta and Ngan of Temple of Literature were also cleaned with LTH chemicals. On the morning of June 25, when we were in these two lakes, we found that the water was clearer and cleaner. On the surface of the lake with white scum layer is the precipitate layer, known to settle after 4-5 days of spraying. It is worth mentioning that the fish in the lake still live well.

According to the research results of scientists of Hanoi Association of Biology and Chemical Society, the bottom of Van lake is deposited with organic sludge with a thickness of 1 - 2m. This is a favorable environment for anaerobic process, causing serious water pollution, affecting the landscape of the lake.

The hydrological and hydrological components of the lake Van have been proved that the lake has heavy eutrophication (type C); NH ₄ and PO _{4 content} exceeded the permitted aquaculture limit; total phosphorus is from 10 and greater than 10; BOD _{5 content} greater than 50mg / liter; suspended matter content greater than 100 mg / liter. In addition, the number of coliforms is too large, up to 82x103 (contaminated water is <10,000), 8 times the maximum level of infection.

There have been many projects and methods of treating pollution of Van lake water, but so far have not been as expected.