By far the biggest percentage of New Zealand Steel capital investment in environmental control is in the improvement of the quality of its emissions to the air. More than three million cubic meters of waste gas is cleaned every hour when the steel mill is working to full capacity.
A major initiative to offset emissions is a cogeneration plant, recycling surplus gas from the iron-making kilns to produce up to 70% of our electricity needs.
New Zealand Steel has an air-quality monitoring programme at the boundaries of its site and in the neighbouring community. Weekly samples are collected for evaluation against strict ambient guidelines. New Zealand Steel regularly exceeds the standards set by regulatory bodies.
Integrated acoustic design, the layout of the plant, silenced equipment and thermal insulation all contribute to noise levels below local Council standards. Very high noise processes are carried out in special acoustic structures.