Cage Waste Cleanup / Removal


Product:         Geotube® Dewatering Technology

Application:   Aquaculture

Location:       Bay of Fundy, East Coast, North America

Installation:   2003


The Challenge:

An aquaculture cage site located in Passamaquoddy Bay (of the Bay of Fundy region) needed to clean the waste generated by the fish farming operation.

The Solution:

This aquaculture site's cages were equipped with the Lift-Up® mortality retrieval system.  This allowed the operator to collect the waste produced by fish feces and unconverted feed.  Once a day, a pump was used to extract the collected waste and load it to a tank aside the farming cages [photo 2].

Once the tank in the boat was filled, the boat approached the shore where the waste was pumped to a Geotube® unit.  The chemical conditioning and polymer flocculation was achieved within the line between the boat and the Geotube® unit.  The waste was pumped at 1.5% solids [photo 3].

The Results:

Approximately 5,000 gallons of fish feces and unconverted food were collected and processed using Geotube® dewatering technology.  The results were excellent in terms of water quality and nutrients removal:

  • Removed 95% of solids.
  • Removed nutrients (more than 90% phosphorous and more than 70% nitrogen).
  • Produced a clean, clear effluent water -- ready to be returned back to the ocean environment [photo 4].