The aim of the project is to address the sewerage disposal problem in the port city.
A survey of the project was started in 2022 to execute the installation of a sewerage treatment plant on 165 acres of land at Halishahar by 2028.
The project is being implemented in phases dividing the city into six zones with six catchment plants.
The CWASA submitted the development project proposal (DPP) of catchment areas 02, 04 and 05 of the facility to the Planning Commission for review.
The DPP has now been submitted to the Executive Committee of the National Economic Council (ECNEC) for approval.
Earlier, the ECNEC approved the DPP of catchment areas 01, 03 and 06.
On completion of the project, households need not have any septic tank as all sewerage will directly go to the treatment plant rather than to the Karnaphuli river.
The CWASA already started work on the construction of the Catchment Sewage Treatment Plant (STP)-1 project in several areas of the city.
Under the project, pipelines will be installed in 200 kilometres. The entire project known as STP-1 has been implementing under three packages.
Two Chinese firms and one Korean firm have been picked for the project.
The Korean firm will lay a 90-km pipeline, while Chinese firms will install 60-km and 50-km pipelines.
Since its inception in 1963, the CWASA did not take measures to solve sewage problem. But the incumbent Awami League government undertook the project.
CWASA managing director engineer AKM Fazlullah said catchment-01 plant work was continuing and it would be fully be completed by 2026.
"New connections will benefit over 2.0-million residents. The contracts were awarded to Tayung Engineering of South Korea, Power China and China Civil Engineering of China in January 2022."
"The Korean firm is constructing the treatment plant with 90 km pipeline while the two Chinese firms are laying two pipelines, on 60 km long and the other 50 km long," he told the FE.
Mr Fazlullah said, "In the first phase, 3,620 manholes with chambers will be built by realigning 3.31 km of existing facilities, with 15 sewage pump stations, service lines, house connections, dry weather flow interceptors and 100 sewage treatment plants."
"Feasibility studies of catchments-02, 03 and 04 has done by a South Korean firm and a Japanese company. Nippon Koei of Japan has been conducting the study of catchments-02 and 04 and a South Korean firm conducted the study of catchment-03."
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