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Lawson C.,TenCate Geosynthetics Asia Sdn. Bhd.
9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010 | Year: 2010

Geotextile containment provides novel solutions for hydraulic and marine engineering applications, and for environmental engineering applications. The three geotextile containment unit types - geotextile tubes, geotextile bags and geotextile containers - are used as mass-gravity elements for hydraulic and marine engineering structures. These same unit types are also used for the dewatering of waste and for the safe contained disposal of waste in marine environments. Source

Ter Harmsel M.,TenCate Geosynthetics Netherlands bv | Yee T.W.,TenCate Geosynthetics Asia Sdn. Bhd. | Ding L.,Ten Cate Industrial Zhuhai Co.
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

Tianjin Eco-City in China is a 30 km2 modern township project currently under the joint development of Singapore and China. The project is scheduled to build sustainable homes for 350,000 residents by 2020 and is designed as a low-carbon eco-city. Tianjin Eco-City will use sustainable technologies, such as solar and wind power, plus innovative wastewater treatment and seawater desalination to reduce carbon footprints. Besides economics, engineering solutions that offer reduced carbon footprints in construction are favoured. A 270 hectare wastewater lagoon laden with contaminated sediments had to be remediated and transformed into a wetland lake as part of the development. Contaminated sediments were dredged for the wastewater lagoon. The lagoon was then pumped dry and reshaped before it was reimpounded. The dredged sediments were dewatered using geotextile tubes stacked four layers high. The geotextile tube stack was eventually capped and landscaped to form a 9 m high lakeside park land with a 12 hectares footprint area. This paper describes the carbon footprint calculation methodology. The carbon footprint for the geotextile tube dewatering and disposal solution for the contaminated sediments is determined. The carbon footprint for the geotextile tube solution was compared with the alternative mechanical dewatering and disposal solution. Source

Yee T.W.,TenCate Geosynthetics Asia Sdn. Bhd. | Lim L.K.,TenCate Geosynthetics Asia Sdn. Bhd. | Ter Harmsel M.,TenCate Geosynthetics Netherlands bv | Choi J.C.,JC Enterprise | Hwang S.P.,Woojin ENC
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

The 33.9 km long Saemangeum Sea Dike in Korea links Gunsan in the north to Buan in the south. As of now it is the world's longest sea dike. Before the dike was constructed, Mangyeon River and Dongjin River discharged directly into the Yellow Sea. When the dike was completed, a 400 km2 reservoir was formed. Development involve land reclamation within the formed lake for agricultural, industrial, business, residential, wetland and ecotourism purposes. This paper concerns the land reclamation works for the Dongjin 1 Package. A polder dike that serves as a land reclamation dike during the construction period and as a flood protection dike for the longer term is constructed. The polder dike consists of a sandfill core with rock revetment for erosion protection on both sides of the dike. A road pavement is provided on top of the polder dike. In the original design, the sandfill core of the polder dike will be constructed in two phases. The first construction phase will involve the use of two rockfill berms to retain the sandfill core up to the water level in the lake. During the second construction phase, the sandfill core will be constructed with exposed gentle side slopes. As an alternative to the original design, geotextile tubes were used to replace the rockfill berms for the construction of the polder dike. More than 26 km of geo-textile tubes were used for this project. The geotextile tube alternative saved USD 6.2 million and up to 7 months in construction time. The geotextile tube alternative was also more environmentally friendly, giving a smaller carbon footprint when compared with the rockfill berm design. Source

Yee T.W.,TenCate Geosynthetics Asia Sdn. Bhd. | Lawson C.R.,TenCate Geosynthetics Asia Sdn. Bhd. | Wang Z.Y.,Ten Cate Industrial Zhuhai Co. | Ding L.,Ten Cate Industrial Zhuhai Co. | Liu Y.,Ten Cate Industrial Zhuhai Co.
Geotextiles and Geomembranes | Year: 2012

An account is given of the use of geotextile tubes to dewater dredged contaminated sediments at the Tianjin Eco-City site in China. Approximately 5 million m 3 of contaminated sediments from the bed of a lake were dredged and dewatered in this way with the effluent water returned to the lake. The dewatered solids were utilized within the project site, or were disposed of in a landfill, depending on their degree of contamination. The paper details the tube dewatering evaluation process undertaken and presents the results on which the dewatering facility was designed. To enable an assessment of the full-scale dewatering performance various relationships were derived based on a conservation of mass of the dewatering process. The design, construction and operation of the dewatering tube facility for the treatment of the moderately contaminated sediment waste stream is also presented. © 2011 Elsevier Ltd. Source

Yee T.W.,TenCate Geosynthetics Asia Sdn. Bhd. | Lawson C.R.,TenCate Geosynthetics Asia Sdn. Bhd.
Geosynthetics International | Year: 2012

The geotextile tube dewatering process consists of multiple cycles of slurry filling and drawdown in order to achieve a desired final volume reduction and solids concentration increase. Relatively simple relationships have been developed in the past to calculate these final volumes and solids concentration values, but the rate of volume reduction and solids concentration increase (i.e. the time periods over which these occur) requires a more sophisticated analysis and modelling approach. The paper develops an analytical model that accounts for dewatering behaviour over multiple dewatering cycles. The model is based on the maintenance of a mass-volume balance at all points in time. Fundamental to the analytical model are two empirically derived dewatering parameters that characterise behaviour during the filling and drawdown phases. Two full-scale field test cases that involve the dewatering of gypsum slurry and contaminated sediments are presented to demonstrate the validity and accuracy of the analytical model. Very good agreements are obtained for the profiles of geotextile tube heights with time, incoming and exiting volumes and final solids concentrations when comparing the modelled results with the actual results. © 2012 Thomas Telford Ltd. Source

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