A Norwegian-backed closed-containment salmon farming project in Maine, known as American Aquafarms, signed a deal Wednesday with Blue Ocean Technology for two large sludge treatment plants.

The systems will be used in connection with closed pens in the sea and have a capacity of 15,000 metric tons each.

The plant will take advantage of nature-based flocculants, and a high level of water purification released into the sea.

When built, American Aquafarms' plant in Maine will be the world's largest full-cycle aquaculture facility based on closed cages in the sea.