Muswellbrook and Denman are serviced by similar sewer networks, however the treatment processes for the raw sewage are different in each township.  In general the treatment process follows the schematic below.

The Muswellbrook sewage treatment plant utilises a trickling filter process for domestic wastewater treatment. The original plant was constructed in 1939, with a subsequent upgrade in the early 1960s which increased the number of trickling filters to three. A significant portion of the plant, including trickling filters One and Two, has therefore been operational for 70 years. Muswellbrook’s sewage treatment plant facility currently occupies 16,000 m², excluding maturation ponds.

In order for Muswellbrook Shire Council to receive and treat sewerage wastes it must hold an Environment Protection Licence from the Department of Environment and Climate Change (DECC) as set out in Section 55 of the Protection of the Environment Operations Act 1997. DECC reviews Council’s licence at least every 5 years.

Under normal conditions Council achieves 100% reuse of all effluent discharged from both of Council’s two sewage treatment plants, which means that there is no discharge to rivers or streams from these plants.

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