CWEA Wastewater Professional :: April 2014 March 2014 Volume 2 | Page 34

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submerged membranes) accommodated operation at high flux while
allowing the visitors to see the
membrane process at this demonstration facility. The footprint of the
facility was further reduced by utilizing an ozone disinfection process
that required a CT (disinfectant
residual x contact time) of 1.0 mgmin/L compared to the traditional
chlorine disinfection process that
requires a CT of 450 mg-min/L in
California. Figure 1 shows the 3D
rendering of the facility prepared by MWH during the
conceptual design phase.

screen that treats raw wastewater
was covered and well-ventilated to
control the odor. Figure 2 shows
the photograph of the Water Sustainability Campus with WRF in the
center and nearby City Hall building on the right. Since the WRF is
an educational facility, three sides
of the building have glass walls to
allow visitors to view the treatment
processes and learn about each
treatment step by reading the signs
outside the building.

and minimizes runoff. The garden
has drought-tolerant plant species
that utilize much less water than
traditional plant species. Additionally, educational signs were placed
outside the building’s glass walls to
teach public about the wastewater
treatment processes and the water
quality produced by the facility.

Automating the facility to
minimize operating cost
Due to the small scale of the
WRF, it was not economically feasible to have a full-time
operator at the facility.This
required a careful selection
Designing an aesthetically
of the unit treatment proappealing WWTP
cesses and unique design of
Another key requirement
the facility such that the fafor the WRF was that the
cility can be fully automated
building had to be aesthetiand monitored remotely.The
cally appealing and should
design of the WRF included
blend in with nearby strucmore than 60 critical protures. Such design would help
cess interlocks and control
develop a positive perception
loops that control the unit
Figure 2 – Photograph of the City of Anaheim’s
among the City Hall visitors
processes and determine
Water Sustainability Campus built next to the
and residents about wastethe necessary operating
City Hall.
water treatment and water
parameters to produce
recycling. The water sustainrecycled water at the operaability campus was also intended
Educating the public about wator specified production rate.The
to educate the public about water
ter conservation and recycling
operator is only required to visit the
conservation features that can be
In addition to the aesthetics,
WRF periodically for routine equipemployed at their residences.The
one of the key design intentions
ment maintenance and to replenish
WRF is located next to the City
for the WRF was to demonstrate
the treatment chemicals.
Hall in a highly built-up area and is
sustainability features that can be
Figure 3 shows the process
a demonstration facility attracting
employed by the public at their
flow schematic of the WRF.The
several visitors. Therefore, the WRF
own residences. Some of these
WRF consists of two process trains
was designed with unique architecfeatures include rain barrel, porous
- Train A and B.Train A is currently
tural style such that it blends with
pavement and drought tolerant
under operation with a design flow
the nearby buildings and does not
garden.The rain bar