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© 2008 Cascal NV
Laguna Alta - Panama
History - Laguna Alta is a turnkey BOOT (Build, Own, Operate and Transfer) project involving the contruction of a 76 mega litre per day potable Water Treatment Plant for Aguas de Panama. The construction includes water sampling and analysis, process design, hydraulic design, civil mechanical and electrical design, procurement of all materials, construction and initialising the operation of the plant.
Partnership - Raw water is obtained from Laguna Alta, which is the main water lake for the Panama Canal. The treatment plant delivers its water directly into the clients distribution system.
The works involve the abstraction of water from Lake Gatun using vertical turbine pumps. These pumps forward the water to adjacent roughing filters through which it enters a raw water holding sump. From this sump, raw water high lift pumps take the water to the treatment works via approximately 11 kilometres of 900mm diameter ductile iron pipe.
Developments - The treatment consists of aeration, rapid mixing, flocculation, coagulation and clarification by the DAF (Dissolved Air Floatation) process prior to rapid gravity filtration and disinfection. This is carried out in a contact tank before storage in a one million US gallon (3,800m³) reservoir on site. From this storage tank water gravitates into approximately 10 kilometres of 700mm diameter ductile iron treated water mains. Delivery is directly into the Client’s own existing distribution system.
Due to the high static heads involved in supplying raw water to the treatment plant, a scheme specifically designed for cleaning and recovery of the filter backwash water has been installed. This has resulted in plant losses being exceptionally low.
The contract also includes a pipeline consisting of five kilometres of 600mm diameter ductile iron pipe to increase the Client’s distribution system. It also includes two inline booster pumping stations which when complete these booster pumping stations will be handed over to the Client for operation and maintenance throughout the period of the BOOT project.
Cascal has complete responsibility for ensuring that the guaranteed volumes of potable water are available to the served population of approximately 300,000 people.
The water quality has to meet contractual standards at all times for the duration of the contract. In order to achieve this Cascal has invested in a state of the art treatment processes using in-house proven technology. Training of local operational personnel has been given a high priority in order that the plant consistently produces potable water to World Health Organisation (WHO) standards.
