Client:

Kempsey Shire Council

Location:

South West Rocks, NSW

Solultion:

Supplement and replace the Biological Nutrient Reduction process of the three existing Passveer channels with a dual tank Sequential Batch Reactor Process

Product:

Diffusers

Rotary Trough Decanters

Submersible Mixers

PLC Control System

Completion Date:

December 2009

Contact:

Ray Janowicz - Aquatec Maxcon

The South West Rocks STP Augmentation Project was a unique project for which Aquatec Maxcon equipment was pre-selected and contracted prior to the selection and appointment of the Civil and/or Prime Contractor. Aquatec Maxcon’s high efficiency AquaBlade Diffuser and Rotary AquaDecanter were chosen and ordered by Kempsey Water well prior to any commencement of work on site. Consequently, Aquatec Maxcon was invited to participate in the conduct of the pre-contract Hazop and Chair meetings that allowed circumvention of many construction, installation and maintenance problems.

The aim of the project was to supplement and replace the Biological Nutrient Reduction process of the three existing Passveer channels, with a dual tank Sequential Batch Reactor process. The dual tank system utilised the intermittent aeration cycles of each SBR tank at 180 degrees out of phase to each other, so that only one set of reasonably sized blowers could be employed to provide the entire air demand for both tanks alternatively.

To this end, Aquatec Maxcon designed, manufactured, supplied, installed, commissioned and proved the performance of the great majority of the new equipment. The equipment thus supplied, included 240 diffusers (120 per tank each of four removable headers and pipe work), two 12m wide rotary trough decanters, submersible mixers, service davits, tank instrumentation (depth, position, limits and dissolved oxygen), as well as the entire dual panel PLC control system for the operation of the SBRs.

The responsibility for the control system enabled Aquatec Maxcon to employ a number of improved control features, including an automatic diffuser purge system to clear the diffusers and headers of condensed or entrapped moisture.

The plant was commissioned in December 2009.

Client:

Clarence Valley Council

Location:

Rokeby, TAS

Solutions:

Water quality improvement and increased capacity to cater for extra sewage flows

Benefits:

Reduction in discharge to the Derwent River by recycling treated effluent

Completion Date:

January, 1999

Contact:

Paul Kwong - Aquatec Maxcon

The Rokeby WWTP was commissioned in January 1999 for the Clarence Valley Council. It is located in the mouth of the Derwent River at Hobart. The 16500EP modified IDEA (Intermittent Decant and Extended Aeration) process included biological phosphorus removal and a chemical dosing system to supplement the phosphorus removal. The IDEAL process maximised the potential for effluent re-use, thereby enabling future reduction in discharge to the Derwent River by recycling treated effluent.

Aquatec Maxcon provided all process equipment for the bioreactor including a fine bubble aeration system, rotating effluent decanting troughs, sludge processing with lime stabilisation, UV disinfection and a PLC based control system.

There are 2 aerobic/anoxic tanks each 20m x 46m x 3.5m deep with an additional 1.2m height for PWWF. Three 75kW positive displacement blowers provide air for the fine bubble membrane diffusers. The tanks operate in alternate mode to provide continuous sludge discharge to the dewatering system and near constant air demand for reduced peak power costs.

The plant is fully automated via the PLC control system and SCADA enabling the plant to be attended part time, allowing operators to also run a number of other nearby plants.

Client:

Coffs Harbour Alliance

Location:

Coffs Harbour, NSW

Service:

Sewage treatment

Solutions:

Water quality improvement and increased capacity to cater for extra sewage flows

Product:

Inlet Works

SBR Tanks

Disinfection

Filtration

Contact:

Karl Naumann - Aquatec Maxcon

Aquatec Maxcon began the major upgrade of the Woolgoolga Reclamation Plant (WRP) in February 2004 to ensure a higher standard of water treatment and additional capacity to deal with extra sewage flows from Mullaway and Arrawarra.The Woolgoolga WRP upgrade to 18,000 EP included the following:

• Inlet works upgrade with 3mm step screen;
• Secondary treatment process upgrade with two (2) SBR tanks using AquaStar Surface Aerators and AquaDecanter;
• Disinfection;
• Filtration with rotating disk filters; and
• Reclaimed water storage and pumping.

Effluent Quality:

The majority of construction activity was on Woolgoolga WRP which was situated within a residential area, with Woolgoolga WRP immediately adjacent to Solitary Island Marine Park and bounded by wetlands. A modified watercourse runs through the centre of the site and connects to Willis Creek in the wetlands.

Due to the establishment of a high performing integrated team and innovative achievements, the WRP Alliance delivered on ALL stakeholders' expectations with zero environmental or safety incidents or complaints and met the extremely challenging timeframe with reduced capital costs of the order of 10%, whilst simultaneously delivering significant additional works within the original budget.

 Council has expressed their immense satisfaction with the delivery of a robust and operator friendly plant, and given their experience with previous sub-optimum projects have stated "to be actively involved in the delivery in the projects and achieve great confidence in outcomes...we would certainly do it all again.” (Geoff Newton CHCC 2004)