The AWPF at Terminal Island contains a two-stage process that produces water that exceeds the level of quality required by the state and federal regulators while providing a beneficial resource to the Harbor area for non-potable reuse. The first stage involves pumping water that has been treated to the tertiary level through a microfiltration unit. These units consist of membranes that filter out minute quantities of pollutants that remain in the tertiary effluent.In the second stage, the microfiltration effluent (or filtrate) is pumped through reverse osmosis membranes that filter out pollutants as small as water molecules. The reverse osmosis process is so effective that AWPF water quality is almost identical to the purity and clarity of fresh water. The water is then disinfected using a chlorine contact tank, which provides an added measure of protection against water borne viruses.In the second stage, the microfiltration effluent (or filtrate) is pumped through reverse osmosis membranes that filter out pollutants as small as water molecules. The reverse osmosis process is so effective that AWPF water quality is almost identical to the purity and clarity of fresh water. The water is then disinfected using a chlorine contact tank, which provides an added measure of protection against water borne viruses.The final "product water" is then pumped through a distribution system to customers in the Harbor area. Every drop of AWPF product water produced reduces the amount of fresh drinking water that is diverted for non-potable uses. The AWPF Ultimate Expansion will be completed in 2017 and will double the capacity of the AWPF to 12 million gallons per day.
The purpose of the microfiltration (MF) system is to provide pretreatment to and remove particulate matter from the tertiary treated water before the reverse osmosis (RO) system. Compared to other treatment systems, the MF treatment process is uniquely capable of consistently producing a high-quality filtrate from tertiary-treated feedwater. The operating capacity of the MF at TIWRP is 8.64 million gallons per day (MGD) of filtrate.
The following components make up the MF System:
The CMF units are the heart of the MF; these units include tubular piping, valves, actuators and modules that are all necessary to the function of the MF. Inside the CMF modules are the hollow, semi-permeable fine membrane fibers which filter the feedwater. The feedwater flows along the outside of thousands of these membrane fibers, and particulate matter is deposited on the outside (shell side) of the fibers as the filtered water passes to the inside (lumen side) of the fibers. More about microfiltration
The purpose of the reverse osmosis (RO) system is to remove dissolved solids and other remaining constituents from the recycled water, conditioning it for use as the supply to the Dominguez Gap Barrier (DGB).
The RO System contains the following components:
The RO feedwater pre-filters consist of a stainless steel pressure vessel that houses cylindrical polypropylene filters. Before passing through the RO filters, the feedwater water is pre-treated, which further reduces the amount of bacteria in the water and the organic matter. The RO process is the last step before the water flows to the chlorine contact tank, and then is pumped out to the DGB. More about Reverse Osmosis
Here are some highlights about the AWPF system at TIWRP:
The following organizations help to operate and distribute the recycled water from the AWPF at TIWRP.
Owns and operates the
Terminal Island Water Reclamation Plant AWPF
Operates the Dominguez Gap Barrier
Water Replenishment District
of Southern California
Purchases the water for the
Dominguez Gap Barrier