Water reduction in aquafeed production at Skretting Australia
Water is a precious resource in Australia where droughts are common and predicted to increase in the future. Since water is a key component of our core business process of converting raw materials into fish feed pellets we must use it efficiently.
In 2016, the team at Skretting Australia embarked on a water reduction project, led by Manufacturing Manager, Stig Støver. There were three reduction areas identified for improvement.
Sustainable fish and shrimp feed production
We reduced the volume of water used in the extrusion process (addition of steam and water) through the modification of our process settings and the formulation of feeds. These changes improved energy usage (less water added, less water to dry out), and in many incidents even improved the product quality.
We activated a partially operational water recycling system, which made a profound impact. Up until now, the water was used and then discharged, but now it is recycled and hence we have reduced the need to purchase municipal water.
We optimised the volume of water required to irrigate our bio-filter functionality (a dry filter medium will not remove odour). As such we also reduced the cost of buying water, but more importantly it reduced the amount of water sent to trade waste.
"These three improvements accounted for a substantial water reduction (20% less water used per tonne of feed compared to 2015) and has had a profound impact on the environmental footprint of our operations in Cambridge. I am very satisfied with the outcomes, considering there were huge growth demands in production, the real impact was even greater than our ambitions," says Støver.
"The coming year will be about consolidating the results, but the focus will continue within operations and for capital investment design activities to continue to identify and further increase our operational efficiencies."