Dewatering Technology

Dewatering Case Studies

  • TenCate Geotube® Lake Dianchi Remedial Dredging - Kunming, China

    Dianchi Lake, China

    Overview:
    Rapid population growth over the last 50 years coupled with large scale industrial development has led to major pollution problems in Lake Dianchi. This development has also resulted in significant sediment accretion in Lake Dianchi due to extensive deforestation of the lake catchment area. Further, up until the 1990's all wastewater and other runoff from Kunming and surrounding areas was pumped directly into the lake untreated. There are also large volumes of contaminated sediments in the lake bed. Consequently, the lake water is now undrinkable and is also rated unfit for agricultural and industrial use.

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  • TenCate Geotube® River Remediation - Melaka, Malaysia

    Melaka, Malaysia

    Overview:
    The city of Melaka is located along the Melaka River which flows North to South through the middle of the city. The river has been the centre of activity throughout the long history of Melaka. However, industrialization and economic development over the last 20 years had led to the indiscriminate dumping of trash and the run-off of nutrients and raw sewage directly into the river. This coupled with a buildup in sediment in the river bed, has resulted in it becoming non-flushing, foul smelling and murky and blackish in nature, along with algal plumes in certain locations.

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  • TenCate Geotube® Wastewater Impoundment Lake Remediation - TianJin Eco-City, China

    Tianjin EcoCity, China

    Overview:
    Located within the Eco-City development area is an existing 3.0km2 wastewater impoundment lake that has been receiving domestic and industrial wastewater impoundment lake is surrounded by a 3m high perimeter earth dyke and has an impoundment capacity of 5.6 million m3. At the Southern end of this lake are two pipe sluice gates which enable lake discharge via the 1,000 year old Ji Canal directly to the Bohai Sea. During the rainy season when the Ji Canal is prone to overflowing, the sluice gates are closed to prevent river water backflow into the wastewater impoundment lake.

    Central to the Eco-City development is the plan to remediate the wastewater impoundment lake that has become laden with contaminated sediments as a result of years of domestic and industrial waste runoff. The water and sediments within the impoundment are contaminated with high levels of heavy metals of mercury, arsenic, copper and cadmium, as well as hexachlorobenzene and DDT. According to the plan the wastewater impoundment was to be transformed into a wetland and recreational lake.

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