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Clifton Water District
Customer Service

Microfiltration Ultrafiltration (MF/UF) Project

The Clifton Water District is continuing our efforts to proactively address the challenges of increasingly stringent water quality regulations by starting the construction of a state-of-the-art Microfiltration Ultrafiltration (MF/UF) membrane water purification system in 2014. This ground breaking project will utilize state-of-the-art and innovative water treatment technology to deliver to our customers a new era of water treatment and advanced filtration that will position us to provide high quality drinking water well into the future.

Microfi ltration Ultrafi ltration (MF/UF) Project

What are We Doing?

  • Removing 37 year old sand filters that have exceeded their useful life
  • Renovating the existing water treatment building to accommodate the new filtration membranes
  • Installing state-of-the-art MF/UF membrane technology to replace the sand filters
  • Constructing a filtration capacity of 12 million gallons per day (MGD) expandable to 16 MGD

Why are We Doing This?

  • To improve water quality delivered to our customers
  • Provide a physical barrier to biological contaminants (Giardia, Cryptosporidium and Bacteria)
  • Maintain future compliance with the Safe Drinking Water Act
  • The existing filtration process has exceeded its useful life and requires a preemptive replacement
  • The existing traditional sand filters are unable to meet future more stringent water quality regulations

What are the Benefits?

  • Improved water quality by improving water treatment efficiencies
  • Provide a physical barrier to biological contaminants like Giardia, Cryptosporidium and bacteria
  • Replace obsolete, traditional sand filtration process with state-of-the-art membrane technology
  • Utilization of modern water treatment processes that provide safe drinking water for the future


Construction begins September, 2, 2014 with the renovation of the Clifton Water District’s Charles A. Strain Water Treatment Plant. Originally built in 1977, the project replaces these older traditional water treatment processes with modern “next generation” technology within the existing building framework. When completed, the facility will be a state-of-the-art 12 Million Gallon per Day (MGD) Microfiltration/Ultrafiltration (MF/UF) Membrane Water Treatment Facility. The three renderings give an idea of what the facility will look like.

The Water Treatment Plant is uniquely designed to effectively treat water from the Colorado River which is subject to variety of runoff and storm events that challenge conventional treatment processes. The District’s water treatment process relies upon a multi-barrier approach and the MF/UF process is specifically designed to provide a final and physical barrier that is unattainable in traditional sand filtration and conventional treatment processes.

The MF/UF Project continues the District’s pursuit of applying leading edge water treatment technologies to provide superior drinking.
MFUF - introMFUF - introMFUF - intro

Weekly Progress Updates

Week 53-54

Milestone of Substantial Completion of Phase 1 of the Project

In addition to approving Substantial Completion of the Phase 1 of the Project, concrete was placed on the deck of the Chlorine Contact Chamber.  The amount of concrete placed on the job was an exhaustive endeavor.
MFUF - Week 53-54MFUF - Week 53-54MFUF - Week 53-54

Week 51-52

One Year Milestone

Construction continued on the Chlorine Contact Chamber.  The Chlorine Contact Chamber will provide an important disinfection step that will provide an additional water quality barrier before leaving the Water Treatment Plant to customers.
MFUF - Week 51-52MFUF - Week 51-52MFUF - Week 51-52

Week 46-50

Construction concentrated on the removal of the existing conventional sand filtration units and the removal of sand and concrete structures enabling the construction of the Chloring Contact Chamber.
MFUF - Week 46-50MFUF - Week 46-50MFUF - Week 46-50MFUF - Week 46-50

Week 40-45

After completing a successful Plant Start-up, this period was used to confirm operational control and the installation of additional equipment important for the effective cleaning process of the Membrane Units.
MFUF - Week 40-45MFUF - Week 40-45

Week 38-39 Continued…

Following the path of our water from the source to finished product.  The Turbidity (clarity) is improved in each stage of treatment  52 NTU (the muddy picture) to 0.680 NTU prior to the new MF UF units to a finished product of and astounding 0.009 NTU.
MFUF - Week 38-39MFUF - Week 38-39MFUF - Week 38-39

Week 38-39

With the absolute barrier of membrane filtration, turbidity (water clarity) readings from the filtration units were 0.009 NTU.  With conventional sand filtration previously used, turbidity readings were 0.015 to 0.025 NTU.  This represents a significant water quality improvement.
MFUF - Week 38-39MFUF - Week 38-39

Week 37

Design Engineers, Carollo Engineering and the Membrane Equipment Manufacturer, H20 Innovations were onsite to complete exhaustive performance testing prior to the official "plant startup".
MFUF - Week 37MFUF - Week 37

Week 34-36

Week 34, 35 and 36 Each of the  eight (8) MF UF "Racks" contains thirty-nine (39) Membrane Modules.  District employees installed 312 Membrane Modules in the 8 MF UF "Racks".  This was in preparation of a June 1 milestone to have the facility operating
MFUF - Week 34-36MFUF - Week 34-36MFUF - Week 34-36

Week 32-33

The Membrane filtration units have a variety of air actuated valves that are operated to maintain appropriate flow of water through the filtration units. Compressed air is provided by an efficient and redundant Air Handling System. As with other critical components of the system, a backup or duplicate reserve system has been installed. The last picture is an overview of the Membrane Feed Pumps, Strainers and MF/UF Filtration Units.
MFUF - Week 32-33MFUF - Week 32-33MFUF - Week 32-33

Week 30-31

The MF/UF Filtration Units require a precise delivery of feed water to function properly. This is accomplished using four (4) variable speed Membrane Feed Pumps. The Membrane Feed Pumps were installed with interconnecting piping and necessary control valves.
MFUF - Week 30-31MFUF - Week 30-31

Week 29

The Membrane Valve Racks have been delivered and installed.
MFUF - Week 29

Week 27-28

Progress has been made installing 24-inch diameter (white) Feed Water Pipe and Strainers (green) prior to the Membrane Units (Photo 1). The second photo shows the delivery of the Membrane Valve Racks into the Water Treatment Plant (Photo 2).
MFUF - Week 27-28MFUF - Week 27-28

Week 25-26

These two pictures show the continued installation of the Stainless Steel Pipe and the Pipe Support Superstructure that will support and suspend elevated piping.
MFUF - Week 25-26MFUF - Week 25-26

Week 24

A majority of the large diameter piping needed is Stainless Steel because of its durability and reliability in Water Treatment Facilities. These pictures show the installation of the critical Stainless Steel Feed lines.
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Week 22 & 23

The major component of this project is the eight MF/UF Membrane Units. These pictures show the size and the unloading of the MF/UF Membrane Units.
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Week 21

This picture shows the installation of large diameter steel pipe that carries water into the treatment area. As with any renovation and retrofit, the work area is very compact and it takes a lot of skill to maneuver large, heavy pieces into small places.
MFUF - Week 21

Week 18, 19 & 20

These pictures show the enormous effort to compete the installation of the floor slab. 2,500 cubic yards of concrete were used to pour the concrete floor.
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Week 17

This picture shows the foundations that hold a number of Fiberglass Tanks used in the MF/UF process. The tanks sit on a “housekeeping pad” and will be contained by a concrete wall that will be placed later.
MFUF - Week 17

Week 16

This project is planned to serve the customers of the Clifton Water District for the next 50 years and is a historic endeavor. To commemorate the event, District Staff and Board Member placed a Time Capsule before the final floor slab was placed.
MFUF - Week 16

Week 15

This picture shows workers placing the finished floor concrete. Because of the size of the floor the concrete was completed in four separate concrete placements or pours.
MFUF - Week 15

Week 14

This picture shows the reinforcement within the slab that is necessary to support the weight of the MF/UF Membrane Units. This are will house 8 units that have a treatment capacity of 2 Million Gallons each.
MFUF - Week 14

Week 13

This picture shows the completion of the “Mud Slab” over the large sedimentation basins. Now that the basins have been filled with gravel and a preliminary slab has been placed, the facility is beginning to resemble the plans.
MFUF - Week 13

Week 12

This picture shows the continued installation of Electrical Conduits.
MFUF - Week 12

Week 11

The picture shows the complex network of reinforcing rebar and electrical conduit throughout the concrete slab. The conduits are installed within the concrete slab and will contain all wiring for controls and power for equipment.
MFUF - Week 11

Week 10

Preliminary “Mud Slab” placed in preparation of installing the reinforcing steel in the floor of the finished concrete slab.
MFUF - Week 10

Week 9

This photo shows the extensive removal of concrete and the installation of a vertical support wall on the left side of the picture.
MFUF - Week 9

Week 8

Filling the renovated sand filter basin with gravel.
MFUF - Week 8

Week 7

The large basins are filled to the top with gravel. A concrete floor will be placed over the gravel similar to a very large garage floor. Approximately 7,500 cubic yards of gravel were used to fill the basins. 7,500 cubic yards of gravel will cover a football field with just over 3 feet of gravel.
MFUF - Week 7

Week 6

New structural foundations were placed to support the weight of the Membrane Filtration Units.
MFUF - Week 6

Week 5

During demolition, one of two original 1977 Sand Filters was removed. This activity involved the removal of over 280 Cubic Yards of sand. The Membrane Filtration Units are being installed to replace the traditional sand filtration water treatment process. In contrast to traditional sand filtration methods, Membrane Filtration provides an absolute barrier from particulate contaminates and is more efficient in the removal of such things as Giardia and Cryptosporidium.
MFUF - Week 5

Week 4

Heavy equipment operated within the building to assist with the removal of very large 42-inch diameter steel piping.
MFUF - Week 4

Week 3

Large portions of the original concrete walls are cut with concrete saws (Picture 1) and the walls were then demolished onto the basin floor (Picture 2). The removal of the existing concrete walls is necessary to provide room for the new foundation and support structures.
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Week 2

These two sequential pictures show the removal of water treatment equipment the Sedimentation Basin and the resulting empty basin.
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Week 1

This is a view of a portion of the original Sedimentation Basins inside the Water Treatment Plant constructed in 1977. This area will be demolished and renovated to accommodate the Microfiltration/Ultrafiltration Membrane Filtration Units. The large basins are in excess of 12-feet deep. The basins will be cleaned, filled with gravel and then a new concrete floor will be placed making a smooth surface for the new Membrane Filtration Units.
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