Pate Engineers - Public Works - Wastewater Systems - BMA-3 Wastewater Collection; Bangkok, Thailand

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BMA-3 Wastewater Collection; Bangkok, Thailand

As the first U.S. team to win a contract for a $2 billion sewerage expansion program in Bangkok, Thailand, PATE was responsible for the design and construction of a collection system. The project also included two new wastewater treatment plants to treat 222,000 cubic meters of wastewater daily. The project will intercept the wastewater generated in these areas, which currently flows into canals, and convey it to the treatment plants, which will be constructed in two separate districts. Included in the overall project design are 13 lift stations ranging from 0.5 to 1.5 MGD. Each pump station includes two pumps; one operating while the other is on standby. The pumps are centrifugal, non-clogging submersible pumps capable of passing two-inch diameter solids. The pump stations are designed for automatic operation and have local and remote alarms. Pump station wet wells and valve vaults will be constructed as pre-cast concrete shafts with 8 feet inside diameters and are installed as caissons. The wet wells have LDPE linings to protect against sulfides. The valve vaults are 7.5 feet deep and the wet wells range in depth from 11.5 feet to 18.5 feet. The contract is the third of eight that will eventually be let in the city's 12-year program to upgrade wastewater treatment facilities for its 12 million residents.