Clean up Hanoi lake by German technology

The water resources situation of many seriously polluted lakes in Hanoi can be solved by German technology.

This is one of the activities of the cooperation project between the Ministry of Science and Technology and the Ministry of Education and Research (Germany). Scientists hope the pollution of lakes in Hanoi will be overcome.

Smooth sludge suction

This technology consists of sucking mud, squeezing water from mud, treating sludge water. The author of the technology is Prof. Dr. Peter Werner, Dresden University of Technology (Germany). Compared to some previous sludge treatment methods, this sludge extraction technology does not need to drain the lake water. Simply plug it directly into the bottom of the lake and remove the mud in each layer. Sludge suction will be carried out in small areas. After that will move to another area. With this approach, according to Prof. Dr. Peter Werner, will limit disturbance of microorganisms at the bottom of the lake.

Experts check the sludge separation system by conveyor.Photo: PV

The sludge mixture after being sucked up is passed through a press to extract water. The separated water is treated before returning the tank, and the mud is pressed into a cake form, convenient for transport to the processing place. Based on the study and survey of the lake's mud layer structure, German scientists can assess the volume and distribution of the mud layer to determine the process of removing mud. In early June 2009, technology was demonstrated to clean water in Uncle Ho fish pond and bring high efficiency.

Witnessing the operation of the technological chain system, Prof. Dr. Dang Dinh Kim, Deputy Director of the Institute of Environmental Technology (Vietnam Academy of Science and Technology), said the operation of the system is quite safe with the system. Ecology in ponds and lakes because the device does not cause much noise, mud is not stirred up much, the oxygen in the water is not much affected.

Associate Prof. Dr. Ha Dinh Duc, Vietnam Association for Nature and Environment Protection concurs with this view and believes that this is a complete system to treat lake water pollution in Hanoi.

The application of German sludge treatment technology allows scientists to think of a more positive signal for water pollution in Hanoi lake.

Clean water in Uncle Ho fish pond.Photo: PV

Water treatment of Hoan Kiem lake

However, dredging mud and cleaning Hoan Kiem lake water is not easy. Because of waste water and sediment swept into the lake, the sediment has been deposited for hundreds of years, thickening and preventing the circulation of lake water with underground water sources. It can be said that Hoan Kiem Lake has become a prison with a shallow water level. Especially endangered is the dry season in 2004, many areas of the lake are inert bottom, forcing Hanoi Drainage Company to supplement water to the lake to protect the ecosystem. According to Assoc. Prof. Ha Dinh Duc, the deepest point of Hoan Kiem Lake is only about 1.1m.

However, in all lakes in Hanoi, Hoan Kiem Lake has a very important meaning both historically, landscape and spiritual. The two distinctive features of the lake are the distinctive green color of the endemic algae and the hundreds of years of existence of the giant precious turtle. Therefore, the research on sustainable treatment of Hoan Kiem lake must ensure the existence and sustainable development of the ecosystem in the lake, not to endanger the giant precious turtle and preserve the typical green of The lake is caused by microalgae living in the lake.

These are also the long-standing concerns of Prof. Dr. Peter Werner. However, as he said, he used to visit Vietnam 20 times in many projects to help Vietnam treat the water environment. He also walked around Hoan Kiem Lake many times, heard many times about the legend of the giant precious turtle. Therefore, he came up with the idea of ​​using modern technology to preserve this contaminated and exhausted water hyacinth flow. The idea has developed into a project assessed by Vietnamese scientists as the most suitable and suitable scale ever related to the preservation of Hoan Kiem Lake and turtles.