Tully STP Inlet Works

Waternish helped Cassowary Coast Regional Council provide a new robust inlet works for the Tully Sewage Treatment Plant. Consisting of dual screens, and integrated grit removal the new inlet works provides a robust barrier to the main treatment plant, significantly reducing operational problems with unwanted material build-up in the bioreactor.

Cassowary Coast Regional Council
$1.4 million
Project Completion
May 2020

The Tully Sewage Treatment Plant has a design capacity of 10,000EP, and services the townships of Tully and Mission Beach. Nested in a bend of the Banyan Creek, the plant was constructed in 2004, and consists of a circular oxidation ditch and clarifier. The original single spiral sieve screen was limiting operation and had no grit removal, resulting in an accumulation of grit and screening material (from bypasses) inside the bioreactor. Waternish designed and constructed a new inlet works away from the main plant, meeting the needs of the current operation, whilst allowing future plant expansion.

The new inlet works redirected four pumped sewage rising mains into a new feed tank, complete with integrated manually screened bypass. Due to the significant rainfall events in this part of far north Queensland, the inlet screens were designed with an individual capacity of 100L/s and a combined system capacity of 150L/s. Elevated above the flood prone surrounding area, the new inlet works improves reliability, and protects the main plant from inorganic waste material and grit. Each aspect of the new system can be bypassed to an empty waste lagoon for major maintenance activities. The plant is then capable of receiving the bypassed sewage back from the lagoon for treatment.

In addition, Waternish made use of the old inlet screen by reconditioning it for use on septic waste receival. This significantly reduced the labour associated with discharge of septic waste material.