Client: Danang Urban Environment Company
Main Contractor: General Construction Company No. 1 (GCC1)
Project Details:
The Three Cities Sanitation Project is part of the World Bank funded project aim at improving sanitation and providing waste water treatment facilities to sub-urban areas of Da Nang City located in central Vietnam.
Green Cosmos undertake the design of HDPE floating covers to nine (9) anaerobic wastewater treatment lagoons and provide field technical services including the supply of HDPE / LLDPE geomembrane cover liners and specialized cover accessories to complete the construction of the floating covers.
Biogas generated beneath the floating covers is piped to elevated gas flares as part of the environmental efforts to control odor and mitigate air pollution in urbanized areas.
A double-Y combined sump and gas harvesting floating cover using composite materials |
Field placement of double-Y corner LLDPE liner in progress |
Main cover plate ~ HDPE liner panels placed to fit base and embankment slopes of lagoon |
Semi-automatic double wedge welder utilized to seam overlapped liner panels |
Closed cell PE foam floats with vacuum formed HDPE caps welded on to cover |
Reinforced polypropylene (RPP) sand-filled ballast tubes and PE encapsulated foam ready for |
Perforated HDPE pipes held in place with PE straps for biogas collection beneath floating cover |
Installed RPP sand-filled ballast tubes in double-Y trench with PE closed cell counter-lift trench |
Infill of lagoon effluent to float constructed cover to its designated elevation for final operations |