PULP AND PAPER MANUFACTURING AT DOUBLE TREE PAPER MILLS

Industry:
Pulp & Paper Manufacturing

Application:
Process Water & Boiler Feed Water

Products Used:
Two (2) ReFlex 200 RO Systems

Year Completed:
2014

Client:
Double Tree Pulp & Paper

Project Size:
400 gallons per minute permeate

Challenge:
Double Tree Paper Mill, an Arizona based pulp paper manufacturer required high purity process and boiler feed water. Double Tree was using water from a local well and treating it with a 150 gpm reverse osmosis system operating at 75% recovery, but this was creating 50 gpm of wastewater – over 26 million gallons per year. The facility wanted to double paper production by adding a second paper machine, but the wastewater flow rate was already at the discharge limit set by the municipal water treatment facility.

Solution:
Water supplies were nearly tripled without increasing wastewater flow by replacing the legacy reverse osmosis system with two (2) 200gpm ReFlex Reverse Osmosis units. At 90% recovery levels, the new units produce only 45 gpm of wastewater in total. At the same time, specific energy consumption was reduced by roughly 25%. The improved process is more sustainable, making better use of well water supplies and saving energy. In addition, the ReFlex units are less affected by fouling and scaling and have the flexibility to adapt to variations in well water quality, making them more reliable than the old reverse osmosis system. For facilities without discharge limits, increased recovery reduces waste disposal costs by 50-75%. Disposal is the largest operating expense for most industrial reverse osmosis.

Results:

Increased Water Resources
– High recovery means better utilization of water supplies and less waste to dispose of.

– The facility was able to significantly increase paper production while complying with historic discharge limitations.

Cost Reduction
– Desalitech’s ReFlex system installed at Double Tree uses 25% less energy for every gallon of water it produces than the legacy reverse osmosis system did despite operating at higher recovery.

– Reduced fouling and scaling and greater reliability reduce operations and maintenance costs.

Environmental Responsibility
– The ReFlex systems help the plant achieve its sustainability goals by reducing water and carbon footprints.