The process of washing salty sea sand to bring to the highway project

    PHƯƠNG ANH |

    After being mined at the mine, the sea sand will be washed to reduce salinity before being used for construction.

    Currently, in the Mekong Delta, only B1 sea sand mine (Soc Trang province) is permitted by the Ministry of Natural Resources and Environment to exploit and serve key projects under a special mechanism. Previously, on June 21, 2024, the People's Committee of Soc Trang province issued a Confirmation of areas B1.1 and B1.2 to VNCN E&C Construction and Engineering Investment Joint Stock Company to organize exploitation to serve the construction of the North-South expressway project in the East. On June 29, 2024, the contractor began exploiting sea sand.
    Currently, in the Mekong Delta, only B1 sea sand mine (Soc Trang province) is permitted by the Ministry of Natural Resources and Environment to exploit and serve key projects under a special mechanism. Previously, on June 21, 2024, the People's Committee of Soc Trang province issued a Confirmation of areas B1.1 and B1.2 (belonging to area B1) to VNCN E&C Construction and Engineering Investment Joint Stock Company to organize exploitation to serve the construction of the North-South expressway project in the East. On June 29, 2024, the contractor began exploiting sea sand.
    According to VNCN E&C Construction and Engineering Investment Joint Stock Company, dredgers continuously enter and exit the mine every day to dredge sand. Sand is extracted by running the suction nozzles of the turtle ships along the sand surface on the seabed. This exploitation does not create deep holes so it does not lead to erosion. Salinity is measured here from 22-25‰.
    According to VNCN E&C Construction and Engineering Investment Joint Stock Company, dredgers continuously enter and exit the mine every day to dredge sand. Sand is extracted by running the suction nozzles of the turtle ships along the sand surface on the seabed. This exploitation does not create deep holes, so it does not lead to erosion. The salinity of the sand here is measured from 22-25‰.
    After exploitation, the sand will be transported to the freshwater area of ​​Hau River in Long Phu town (Long Phu district, Soc Trang province) to wash away the salt, about 40km from mine B1.
    After exploitation, the sand will be transported to the freshwater area of ​​Hau River in Long Phu town (Long Phu district, Soc Trang province) to wash away the salt, about 40km from mine B1.
    Mr. Do Minh Chau (in white shirt) - Deputy Director of VNCN E&C Construction and Engineering Investment Joint Stock Company said that at the transfer point, workers will continuously pump fresh water into the suction ship to wash away the salty sea sand. The ship's compartment is designed with holes, when full of water, it will overflow, carrying the salty water. When the water level in the compartment is 13-17‰, it is considered satisfactory. Immediately after that, the sand is pumped to the overflow ships to be brought back to the construction site.
    Mr. Do Minh Chau (in white shirt) - Deputy Director of VNCN E&C Construction and Engineering Investment Joint Stock Company said that at the transfer point, workers will continuously pump fresh water into the suction ship to wash away the salty sea sand. The ship's compartment is designed with holes, when full of water, it will overflow, carrying the salty water. When the water level in the compartment is 13-17‰, it is considered satisfactory. Immediately after that, the sand is pumped to the overflow ships to be brought back to the construction site.
    The sea sand has been washed salty at the point of transfer to the ship's side.
    The sea sand has been washed salty at the point of transfer to the ship's side.
    After being filled with sea sand, the spillway ships will bring sand to the construction site to serve the expressway construction in Kien Giang and Ca Mau within a period of 32-34 hours (equivalent to more than 180km). Meanwhile, the suction ship will move to the B1.1 and B1.2 mines offshore to collect more sand.
    After being filled with sea sand, the spillway ships will bring sand to the construction site serving the expressway construction in Kien Giang and Ca Mau within 32-34 hours (more than 180km away). Meanwhile, the suction ships will move to the B1.1 and B1.2 mines offshore to continue taking sand.
    When arriving at the construction site, the sand is pumped with water to be washed again and re-checked for salinity before being pumped into the construction site. In Kien Giang and Ca Mau, the salinity measured in the rivers next to the construction site is about 22-27‰, higher than the salinity of the sand. "Because the construction sand is re-invaded by salt, the salinity is about 20-22‰. According to the standard, the salinity of the filling material is less than 5% (equivalent to 50‰), so in terms of criteria, the sea sand is guaranteed," said Mr. Do Minh Chau - Deputy Director of VNCN E&C Investment - Construction and Engineering Joint Stock Company.
    When arriving at the construction site, the sand is pumped with water to wash it again and the salinity is checked again before being pumped into the construction site. In Kien Giang and Ca Mau, the salinity measured in the rivers near the construction site is about 22-27‰, higher than the salinity of the sand. "The sand is re-invaded by salt at that time, the salinity is about 20-22‰. According to the standard, the salinity of the filling material is less than 5% (equivalent to 50‰), so in terms of criteria, the sea sand is guaranteed," said Mr. Do Minh Chau - Deputy Director of VNCN E&C Construction and Engineering Investment Joint Stock Company.
    According to My Thuan Management Board, from the beginning of July to the end of August, the exploitation capacity was about 6,500m3/day, with a total volume brought to the project of about 80,000m3. It is expected that by the beginning of September 2024, the capacity will increase to about 15,000m3/day. The contractor is continuing to mobilize additional exploitation equipment to ensure that 20,000 - 30,000m3/day is achieved to serve the project according to demand.
    According to the My Thuan Project Management Board, from the time of commencement (June 29) to the end of August 2024, the exploitation capacity was about 6,500m3/day. The total volume brought to the Can Tho - Ca Mau expressway project was about 80,000m3. In early September 2024, the capacity increased to about 15,000m3/day. The contractor is continuing to mobilize additional exploitation equipment to ensure that 20,000 - 30,000m3/day is achieved to serve the project according to demand.

    PHƯƠNG ANH
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