Water Supply Plan - City of Miami

Water Facilities Master Plan
Water Supply Facilities Work Plan
A 5-9
KM2740.Sec5a .doc
11/26/2007
5.2.6 South District Wastewater Treatment Plant (SDWWTP)
5.2.6.1 Phase 1 (18 MGD)
Start 2007
Finish 2014
Phase 1 of the Groundwater Replenishment (GWR) project at the South Miami
Heights WTP is scheduled to be ready for implementation by 2014 expanding the
finished water AADD by 18 MGD at a cost of $357.5 million. MDWASD has prepared
a NTPC for selecting a Consultant to design the project, and will take the requests to
advertise to the December 2007 Government Operations and Environment Committee
Meeting. Design could be completed by mid-2009. This potential certified project
will provide advanced treatment of 30 MGD of secondary effluent to produce
approximately 23 MGD of highly treated reclaimed water that will be piped to
replenish ground water for water supply purposes. The technologies to be used
include micro-filtration and reverse osmosis which filters out small particles and uses
ultraviolet light for disinfection. High quality water would be piped to areas
upgradient of the proposed South Miami Heights wellfield and discharged into the
groundwater through underground trenches. Based upon this replenishment of
water, more water can be withdrawn and treated for drinking water purposes at this
treatment plant. This approach will enable the continuous use of the South Miami
Heights WTP, which will be constructed over the next four to five years.
5.2.6.2 Phase 2 (20 MGD)
Start 2015
Finish 2021
Phase 2 of the GWR for the Alexander-Orr WTP will add 20 MGD to the water supply
with total costs estimated at $482 million. The methodology used at the South Miami
Heights WTP will also be used for the Alexander-Orr WTP to replenish groundwater.
The GWR at Alexander-Orr, potential certified projects, will be available to initialize
operations in 2021. Alternately, MDWASD is looking at the option of constructing a
new West District Water Reclamation Plant (WDWRP) to produce high quality
recharge water to offset groundwater withdrawals in the Alexander Orr subarea
wellfields namely, increased withdrawal at the Southwest Wellfield. This plant is
scheduled to come on line in 2020.
Alternatively, MDWASD recently completed the Interim Wastewater Facilities Master
Plan, which recommends the establishment of the West District Water Reclamation
Plant (WDWRP), combined with wastewater storage facilities for peak wet weather
conditions in the Central West area of the County.