Case Study: Chiquita

Ferric, Manganese and Latex removal for Chiquita banana packing plant


Project ID:

Company: Chiquita
Location: Panama
Year: 2003
Description: Supply clean water for a Banana Packing plant
Goal: Ferric, Manganese and Latex Removal from delaxing pools
Capacity: 40 m3/hr
Water Source: A private deep well

The Problems:

  • The plant’s well water contained Ferric and Manganese.
  • The incoming bananas oozed Latex from the cut.
  • The combination of the above turned the water color to purple and stained the bananas.
  • Water turbidity was above the maximum allowable level.
  • Water polluted with germs and fecal coliforms.
  • Wastewater were not recycled and created ecological problems downstream.
Parameter Existing Values Required Value
Turbidity (NTU) 150 < 10
Coliform Forming Units (CFU/100 ml) 1,500 < 10
Color (UC) 500 < 30
Ferric (mg/l) 1.5 < 1
Manganese (mg/l) 0.4 < 0.2
Latex   Minimize
Water & Energy Cost   Minimize

Technical Solution:

The following processes were carried out:

  • Side-stream circulation: Screen Filtration with automatic back wash.
  • Oxidation of Ferric, Manganese and Latex into a lamella reactor: Implementing Hydrogen Peroxide with redox control.
  • Coagulant dosing in order to agglomerate the oxidized fine particles into bigger flocs.
  • Media Filtration: Catalytic Media Filters – implementing AFM®.

Delaxing Pools

Lamela-Oxidation-Reactor (L.O.R.)

Lamela-Oxidation-Reactor (L.O.R.) Process

Exterior view of the Catalytic Media Filters


Parameter Required Value Before treatment After treatment
Iron (mg/l) < 1 1.5 0.3
Manganese (mg/l) < 0.2 0.4 0
Color (color units) < 10 500 10
COD (mg/l)   120 25
Turbidity (NTU) < 10 150 2
Colony forming units CFU/100 ml 1,500 1,500 10
Appearance of delaxing pools   Purple-black Clear
Water saving (%)   0 84%
Electricity saving (%)   0 40%

Dryden Aqua’s Deliverables: