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Kurita - Great cost of good action in Brazilian Pulp mill Kuriverter IK-110 reduces water supply problems in a Pulp mill

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Brazilian pulp mill has a Reverse osmosis plant for the boiler’s make up water preparation. Due of silica and fouling problems, the pulp mill experienced several complications in the RO plant that end in frequent cleanings and non- desirable stops.

The proper functioning of the osmosis is a key point to keep the quality of the makeup water that is needed in the high pressure Boiler plant. The objective of the membranes is to produce demineralized water with less than 20 ppb of SiO2.

Description of the plant

The RO system consist in 4 vessels and each vessel requires a cleaning every 4 days, which translates into 1 cleaning/day for the RO plant.

Objectives

  •  Stabilize the delta P
  •  Reduction of cleanings
  •  Reduction of biofouling deposition in the RO system.
  •  Reduction of Total operational cost

Action/Approach

After collect samples and data, it was verified that the main cause of problems was due to the biofouling formation on the surface of the membranes. Kurita proposed the application of Kuriverter IK-110 to control the biofouling growth and deposition.

Achievements

  • Stabilization of delta P

Reduction of Chemical cleanings

  •  88% less chemical cleanings
  •  20% reduction in the number of post-permeate mix bed regeneration
  •  Reduction in Electric energy consumption
  •  Reduction in chemical cost
  •  Enlargement of membrane shelf life

Conclusion

Kuriverter IK-110 improved the working days of the pulp mill and reduced the total cost of operation.