Belmont Wastewater Treatment Works (WWTW) was upgraded in 2008 and the increased volume of wastewater treated at the site led to a 35 per cent increase in its electricity consumption. Through a focus on energy efficiency at the site, simple changes to the aeration system reduced electricity consumption by 20 per cent since April 2010 (Figure 1).
An intense effort by Hunter Water process engineers and Hunter Water Australia consultants to establish accurate operational limits for the process resulted led to the refinement of margins of error for safe operation of the aeration scheme. The benefits, including reduced energy costs, GHG footprint and improved process stability, were immediate.
Figure 1: Electricity consumption at Belmont WWTW showing result of aeration system changes