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Padre Dam Advanced Water Purification Demonstration Project, California, USA

Key features:

Advanced water purification technologies were utilised in the construction and installation of this indirect potable reuse facility.

The advanced treatment processes included in the design are: chlorine disinfection, coagulation, ultrafiltration, reverse osmosis and advanced oxidation.

To deliver these advanced treatment processes on a fast-track basis, the following system elements were required on-site for fabrication, installation and commissioning:
  • Field pumps
  • Chlorine contactor
  • Chemical dosing systems
  • Ultrafiltration system
  • Reverse osmosis system
  • Advanced oxidation process system (using ultraviolet light (UV) and oxidation)
  • Programmable logic controller (PLC) instrumentation, motor control centres and electrical panels 

2015-07-24 100446   
Close-up of membrane treatment trains used in the pilot plant
In recent years, California has suffered severe and devastating drought conditions and attention has turned to the need for increased conservation efforts, water supply facilities and innovative reuse solutions to ensure the State drought proofs itself ahead of future dry spells.

In an effort to diversify its water supply, whilst also reducing its dependency on imported water, Padre Dam Municipal Water District embarked on an advanced water treatment plant project to explore a new source of water in Santee, California. The new facility was constructed to treat secondary effluent from a wastewater treatment plant in the District, and the treated water used for demonstration and testing purposes, to ensure it exceeds the stringent California Public Health Department’s draft regulations to be able to utilise the facility to provide for Padre Dam customers.

After the testing period, the District hopes to be able to expand the facility, to construct a full-scale plant to provide up to 10 million gallons per day (MGD (US)) of treated water with indirect potable reuse potential. With the necessary approvals to proceed, treated water would be injected into the local groundwater basin. It would undergo natural filtration, be withdrawn, treated again, and then distributed as potable water to customers.

The Advanced Water Purification Demonstration Project was funded through a three million dollar ‘Proposition 50’ grant from the Department of Water Resources.

Biwater provided a complete turnkey design, and supplied and commissioned all process, mechanical, electrical and control components for the plant.

Biwater was chosen for its ability to supply a fully integrated# system on a fast-track delivery, supporting Padre Dam’s efforts to initiate proof of concept and testing activities as soon as possible.

 2015-07-24 094858
 Demonstration project plant view 




Location: California, USA  Scope of Works: Fabrication and commissioning of all process equipment
Client Integrated Water Services, Inc (Client)
Padre Dam Municiplal Water District (Owner)
Key technologies: Ultrafiltration (UF)
Reverse osmosis (RO)
Advanced oxidation process (AOP)
Ultraviolet (UV)
Project Duration: 5 months, fabrication and commissioning     
Completion Date: December 2014    
Plant Capacity: 378 m3/day
0.378 million litres per day
100,000 US gallons per day