Recycling Treated Municipal Wastewater for Industrial Water Use

TM3: Recycled Wastewater System Components and Costs
Recycling Treated Municipal Wastewater for Industrial Water Use
Advanced
Secondary
Effluent
Cartridge
Filtration
Microfiltration Reverse Osmosis Disinfection
Figure 10. Tertiary 3 – Membrane Softening
Reverse osmosis produces a water quality that would be adequate for most industrial
process uses, except those with very specific requirements, such as electronic and
computer manufacturing facilities. It also produces a higher quality of water for
cooling applications, which will allow for more reciruculation and water
conservation.
Treatments costs, expressed as cost of service, about $2.50/1000 gallons for a 1 mgd
supply, dropping below $2/1000 gallons for 15 mgd capacity systems.
5.6.5 Tertiary 4-Advanced
Tertiary – 4 With GAC
The Tertiary 4 classes of reclaimed water provide additional treatment to remove
specific target constituents. Granular activated carbon (GAC) reactors are typically
used to remove a variety of organic compounds and heavy metals. For this study’s
cost model, the reactor is assumed to follow the reverse osmosis process as shown in
Figure 11. This process train would be for a very specific situation. A more likely
scenario for application would be the use of GAC following microfiltration without an
RO process. This process train would be used to target specific constituents (metals,
organics) for a water reuse application that was not concerned with hardness or high
salt concentrations.
Advanced
Secondary
Effluent
Microfiltration
Cartridge
Filtration GAC
Reverse Osmosis
Disinfection
Figure 11. Tertiary 4 – Membrane Softening with GAC
38 Craddock Consulting Engineers
In Association with CDM & James Crook
TM3-Component&Costs_0707