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Maccaferri India installs a Geomembrane for Ash pond lining at Andhra Pradesh


Maccaferri India used its Geomembrane MacLine SDH HDPE product to line an ash pond located in Andhra Pradesh, India

Thermal Powertech Corporation India Ltd. (TPCIL), a wholly-owned subsidiary of Sembcorp Industries Ltd, is the first to build, own and operate a 1,320-megawatt (2x660MWunits) coal-fired coastal power plant in India.

TPCIL was planning to build the power plant which is expected to be implemented in two phases, with units of 660 and 600 megawatts. Thermal Power stations use pulverized coal as fuel to generate large quantities of ash as a by-product. The ash is transported as slurry through the pipe and disposed of in an impoundment that is more commonly known as an ash pond.

In this project, three numbers of 2km long and 4.5m height ash ponds were constructed. The lakes were named Lagoon A (Overflow lagoon), and Lagoon B. Thermal Powertech Corporation India Ltd. decided to protect the slopes and the bottom of the ash ponds by providing a liner packing to prevent the infiltration of the slurry. They chose to approach Maccaferri for supply an installation of the base and side liners.

Considering the importance of the project and protection of the environment, Maccaferri suggested the use of 1.0mm thick Geomembrane MacLine SDH HDPE to stabilize the slopes as well as for the bed of ash ponds, which will act as a hard core impermeable liner. The side slopes of the pond were dressed in a stable inclination of 1V: 2H before laying the membrane out.

A safe anchoring was applied at the top of the liner by providing anchor trenches to ensure the stability of the liner. Also, a 200mm thick brick liner was used above the Geomembrane liner on the slopes.

The joining of adjacent membranes was achieved by wedge welding through the use of two nos. Leister Cometwedge welding machines present at the site.

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