Education - Honouliuli Water Reclamation Facility - Page 2

 

 


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WATER RECYCLING FACILITIES

Construction of water recycling facilities within the Honouliuli WWTP commenced in January 1998 and was completed in the summer of 2000.  The facility was officially dedicated in August 2000.  Prior to its dedication, the water recycling facility was purchased by the Honolulu Board of Water Supply (BWS) in July 2000 for $48.1 million from USFilter Operating Services.


Overview of the Recycling Facility

The entire water recycling facility is located adjacent to the City & County of Honolulu's Honouliuli WWTP.  Water recycling components include a Reuse Pump Station, a Sand Filter Structure which includes rapid mixing tanks and chemical flocculators, Ultraviolet Light (UV) Disinfection, a Microfiltration/Reverse Osmosis Building, Storage Tanks, and a Product Delivery Pump Station.

The facility currently has a capacity of 12 million gallons per day (mgd) and produces two grades of recycled water.  R-1 water is used for irrigational uses, and Reverse Osmosis (RO) for industrial uses.  The facility is currently capable of producing up to 10 mgd of R-1 water, which is the highest level of treatment as designated by the Hawai‘i DOH.  R-1 water is currently used throughout the state of Hawai‘i for golf course irrigation, landscaping, and agriculture.  On the other hand, RO water is intended strictly for industrial uses such as boiler feed water, cooling tower make-up water, and process water for refineries.  The facility currently has an RO capacity of 2 mgd.  Both types of recycled water begin with secondary treated effluent from the Honouliuli WWTP.

THE R-1 PROCESS
The R-1 process includes the following components:

Schematic Diagram of R-1 Process

Secondary effluent flows by gravity from the existing Parshall flume box into the Reuse Pump Station.  Lift pumps in the Reuse Pump Station convey effluent to the Sand Filter Structure, where polyaluminum chloride is added and rapidly mixed in one of two mixing tanks.  The effluent then flows into one of three flocculation tanks to facilitate the coagulation of suspended and dissolved particles to form larger and/or denser particles.  The effluent then flows into one of seven sand filter cells.  Filtered effluent is collected in an underdrain system to a clearwell at the rear of the Sand Filter Structure, then flows by gravity to the UV Disinfection system (consisting of 4 banks).  Disinfected effluent is then conveyed by the R-1 Transfer Pumps to one of two 2.5 million gallon storage tanks.  The R-1 effluent is then pumped to customers via the R-1 Product Delivery Pump Station.

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Last Updated: December 13, 2007