Langat centralised sewage treatment plant sets new benchmark

The massive Langat centralised sewage treatment plant (CSTP) in Selangor has set a new benchmark for the nation’s sewerage industry in various aspects.

A project by the Water, Land and Natural Resources Ministry (KATS), the Langat CSTP was recently recognised for having the longest micro tunnelling curvature severage pipeline—totalling 725 metres—one of the key segments that support the 105 kilometre-long gravity sewer network.

Instead of the conventional open trench method, a pipe jacking construction methodology was chosen as the most feasible solution to minimise inconvenience to the public and to resolve problems associated with pipe-laying in urbanised areas, said main contractor MMC Pembetungan Langat Sdn Bhd (MMC PLSB) in a statement. The engineering feat is a result of a collaboration between MMC PLSB and its technical partner MMC Engineering Sdn Bhd and tunnelling specialist ICOP Construction (M) Sdn Bhd.

In terms of safety, the project also passed nine million man-hours without loss time injury in January 2019.

Scheduled for full completion in March 2022, the RM1.5 billion plant will be able to treat raw sewage to Category 1 Standard A effluent as stipulated in the Environmental Quality (Sewerage) Regulation 2009 before releasing it into Sungai Langat. It is expected to benefit a population of 920,000 population, within a 60.9-square-kilometre catchment area in Cheras and Kajang, help in the preservation of Langat River’s water quality, and reduce the burden of contamination on the nearby water treatment plant.

It incorporates cutting-edge sewage treatment plant initiatives undertaken at the Tokyo Metropolitan Sewerage Service in Japan. As the plant is constructed in a conventionally limited land area, an innovative treatment technology—the Deep Aeration Method with Step-Feed Multi Stage De-Nitrification Process—was adopted to increase sewage inflow capacity by up to three times more than the conventional method with the same size of land area.

The plant’s odour reduction feature, also made possible with Japanese technology, reduces ammonia output by half. The plant system is enclosed, unlike the conventional open pond system, and built-in with Green technology features to generate biogas and harness solar energy as supplementary power for operational equipment.

The development also houses a sports centre, featuring futsal and badminton courts, a children’s playground and community hall, for the public. There will be separate entrances for access to the plant and sports complex, located above the maintenance floor,  for security purposes. ― Construction+ Online