Category Archives: Sewage Treatment Plant

Westgold Wastewater Treatment Plant

Another pair of Ecofarmer 250 units on deck for one of our mining clients in Western Australia. Arranged in twin train Ecofarmer 250 design with a Class A advanced media polishing packaged to ensure we meet our clients site compliance.


Client: Westgold

Location: Western Australia

Project: Westgold Cue Village WWTP upgrade

Solution: Twin Train Eco250 units with class a polishing package

Industry: Mining



The current waste water treatment facility situated at Cue Village Westgold needed to be replaced due to age and premature wear on the steel structure.

RWWA was asked to submit a proposal to design and construct a suitable waste water treatment system that suited the site hydraulic and incoming biological nutrient demand that would meet the release criteria as specified by governing body.

The new sewage treatment plant (STP) is designed to provide ongoing reliable service and to minimise maintenance requirements, ensuring ease of operation whilst maintaining reliable effluent quality and daily production.

Westgold Wastewater Treatment Plant

The site compliance targets are based on standard nutrient with Class A disinfection requiring less that 10 Ecoli per 100 ml of sample. Our Ecofamer SBR solution is packaged and delivered complete with our integral Class A glass media filtration system, that will further filter the supernatant from the sequencing batch reactors (SBR) to a higher class of final effluent, to release to ground.


Our glass media design is based on the ‘Drydan Glass,’ a validated and certified media product sold here in Australia. This is a highly refined crushed glass with excellent flux potential, allowing for full rejuvenation through a backwash and chemical clean process that extends to the filtration cycle, as oppose to conventional sand base media.


Our Class A media package is housed in a 20 ft high cube container beside our Ecofarmer treatment units. A dedicated feed pump on the VSD control, will continually recirculate the supernatant fluid over the glass media. Then the flow pace chlorine injection will sanitise the water keeping the media beds at optimal working order, whilst reducing fouling potential free residual oxidant. This will then be monitored and corrected for bacteriological control in the final effluent water body. Once the water has met specification within the chlorine contact residence time, a modulating valve will allow fluid to pass to the irrigation field.

As part of our advanced technology, a centralised Allen Bradley HMI and PLC will engage the operator allowing for full remote access, reducing any unnecessary call out fees.


The RWWA difference is our unique fabrication process of our engineered certified steel reactors that provide a generous 20 year chassis life guarantee. Our chassis are built from the ground up with 6 mm flat sheet formed and pressed for the walls giving the ultimate in rigidity and corrosion allowance. In addition, a suitable international or Jotun coating is applied to the internal and exterior of the box.

We are committed to providing the highest quality product and service to our customers.

Australian Potash LTD | Sewage Treatment Plant

Client: Australian Potash LTD

Location: Western Australia

Solution: Ecofarmer SNR 250 Class A Package

Industry: Agriculture



Australian Potash LTD are developing a new facility at Lake Wells near the Laverton Region of Western Australia.

The operational facility will accommodate up to 120 full time staff and the facility has an expected operational life of up to 30 years.

As a part of the ongoing site utility and services management – a new sewage treatment system will be installed to cater for treatment of the sites sewage waste from the accommodation facility.

The new sewage treatment plant (STP) is to be designed to provide ongoing reliable service and to minimise maintenance requirements, and ensure ease of operation whilst maintaining reliable effluent quality and daily production.

Although the current site modelling is for only 120 persons to accommodate full time, RWTS sized the system to accommodate up to a maximum 250 persons to allow for any potential future expansions of facility.

Westgold Resources Water and Wastewater Treatment Plant

Client: Westgold Resources

Industry: Mining

Systems: EcoFarmer Wastewater Treatment Plant, Reverse Osmosis Water Treatment System


Westgold Resources, a top 10 Australian gold producer, recently began operations on their fourth Western Australian project – Cue Gold Operations. In order to manage the wastewater of their 200-man remote accommodation village at the Big Bell Underground Mine, Westgold approached RWTS to design and manufacture a wastewater treatment system. This same site also required a water treatment system to transform he local raw (bore) water into high quality drinking water as deemed by the Australian Drinking Water Guidelines.


RWWA Solution

This project was an ideal candidate for the EcoFarmer 250 Wastewater Treatment Plant which utilises a Sequential Batch Reaction (SBR) process. Although this is a standard process throughout the water treatment industry, RWWA emphasised the functionality of the plant from the initial design stages. Through the seamless collaboration between our in-house engineering and electrical divisions, smart automation was integrated for enhanced productivity with less operator intervention.

How does the automation work?

The plant continually revises code as it observes the plant’s flow. When limited flow is achieved throughout the day, a standby code automatically seizes control of the plant and in peak periods the extended code will drive the plant.

In addition, Westgold Resources will reap the benefits of the EcoFarmer, that come as standard in this turnkey range, including:


– Robust steel construction to withstand harsh, remote environmental conditions

– Seamless transportability, attributed to the ISO shipping container design

– Premium Allen Bradley HMI (interface) and PLC control system

– Biological treatment process pre-approved by state regulatory bodies


Guaranteed & Certified Design

The design was accepted with process and structural certification by REPQ.

All stringent Western Australian department of health requirements where achieved, including a 20-year design life on the plant.

The structural steel shell was manufactured sandblasted, primed and painted with an International shipping coating internally. As part of our manufacturing process, spark testing was completed across the vessel to proactively identifying any potential issues with weld and coating. This ensured the integrity of the internal and external coating surface.

RWWA designed and manufactured a reverse osmosis potable water treatment system to meet the potable water requirements of the Westgold Big Bell remote workers’ village.


Built to Last

As the industry specialist in packaged water treatment systems, we decided to containerise the RO system. This allowed for ease of transportation and protection of the system from harsh rural environmental conditions.

For optimal insulation, the internal plant room was lined with 75 mm foam-filled panelling on the walls and ceiling, and air-conditioning system was integrated to ensure ideal operating temperature through the hotter and cooler months.

User-Centred Design and Automation for Streamlined Operation

The treated water recirculation monitoring and dosing control platform was our internal proprietary offering. This specialist feature is able to measure chlorine pH and conductivity, utilising the new range of Burkert flow fit cubes with gateway Ethernet, and display these levels in real-time on the PLC HMI plant platform.

Our internal programming and instrumentation division designed and custom-built the HMI to be single interface of all plant monitoring, streamlining plant observation and operation. This thoughtful feature allows Westgold to reduce operating costs and rapidly identify and respond to any potential issues.

As with all RWTS chemical injection systems, this Westgold system was fitted with Burkert Viton solenoids and Mazzi Venturi systems. Again, these offer fully programmable control through the HMI system, enabling the operator to take control at any time. A

The RWWA Brackish water reverse osmosis design also features flux targeting through flow metering with secondary pressure monitoring. This allows the RO system to maintain flux across the filter elements in permeate and concentrate streams through modulating v-notch ball valves. This is common on large scale membrane projects, however, in the price-driven remote camp market, it is often overlooked, and flows are set with manual tuning valves. This unfortunately is detrimental to the life of the membrane, resulting in more frequent membrane replacements and increasing the long-term operating costs of the plant.


Smart Technology for Flexible Monitoring & Control

RWWA uses the latest Allen Bradley HMI and PLC platform for full control of all our plants. These systems have a wireless router allowing for full remote dial-in access through site wifi. This is a must in the ever-changing water and wastewater servicing industry. It allows the plant performance and parameters to be viewed anywhere, anytime. Imagine the ease of troubleshooting over the phone with your site-based operator as you monitor the plant’s performance in real-time. That’s the RWWA difference.

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