Use bucket of sludge dredge machine: Take care of the habitat of Turtle tool

Construction unit is using bucket machine to remove mud in Hoan Kiem lake. Scientists believe that this form will destroy the ecosystem in the mud layer of Hoan Kiem Lake, overturning the familiar habitat of the turtle.

In the past, Hoan Kiem Lake sludge dredging unit has delineated two areas (each area is about 500m ² ) in the area of ​​Thuy Ta Restaurant and in front of Hanoi Post Office (in which the area of ​​Thuy Ta restaurant has been dredged finished). ). Both of these areas use construction machines to remove mud. Do not apply German technology (technology has successfully piloted in Hoan Kiem Lake in 2009). Currently, the third area opposite Ha Noi Moi newspaper is being barricaded to prepare dredging by the above method.

Referring to the problem of sludge suction to stabilize and restore the environment of Hoan Kiem Lake, scientists have put forward many recommendations and solutions in the German "Sludge Application Research Report to stabilize and restore the environment of some lakes in Hanoi ', 2010. This is the Vietnam-Germany Protocol Cooperation Project (Associate Prof. Dr. Ha Dinh Duc, Project Manager. Dr. Bui Hoc, Associate Prof. Dr. Luu Van Boi, Prof. Dr. Dang Dinh Kim, Dr. Le Hung Anh, Mr. Nguyen Le).

Assessing the consequences of manual dredging and dredging, the report said: 'Ecological sludge extraction with advanced technology has not been conducted in Vietnam. The technologies used in the past to renovate lakes in Hanoi are mainly by means of pumping shallow water and dredging mud in the lake by excavators or by manual methods. Then carry out stone embankment and pump clean water into the lake. Thus the entire ecosystem in the lake has been destroyed and cannot be restored. ' The current use of mud dredging buckets raises concerns that the Hoan Kiem Lake sediment will be completely disturbed in the two areas mentioned above.

According to scientists, the mud layer around the Turtle Tower, Thuy Ta Restaurant, Hang Khay Street is very thin. The recommendation is that the mud should be drenched with a thickness of 10cm to 20cm, because the mud layer is thinner than other places, if it absorbs much, it will affect the ecosystem of the lake.

In fact, the construction unit used a bucket to remove sludge at Thuy Ta Restaurant area and is drowning in the area opposite Hanoi Post Office, with a much larger thickness than the scientists recommend. given.

' The results of the analysis of biology and chemistry show that the factors that pollute the environment and heavy metals are more distributed in the top part of the mud layer, polluting the water in the lake. If the sludge is sucked in this top part, it will make the lake's water environment cleaner and make the thickness of the water layer in the lake bigger, creating conditions for turtles and microorganisms in the lake to live smoothly with the environment. better school '. The use of bucket for dredging mud is very easy to destroy the ecosystem in the mud layer of Hoan Kiem Lake; It is necessary to organize a scientific workshop solution solution to bring the Turtle back to the lake in the current conditions.