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Category Archives: Chemical Dosing

Wastewater Treatment Plant and Reverse Osmosis System: Westgold Resources

A wastewater and water treatment system for Westgold Resource’s 200-man remote camp in Western Australia.

 

Client: Westgold Resources

Industry: Mining

Systems: EcoFarmer Wastewater Treatment Plant, Reverse Osmosis

 

BACKGROUND

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.

 

THE RWTS SOLUTION

EcoFarmer 250 Wastewater Treatment System

Westgold EcoFarmer 250

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, RWTS 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.

Brackish Water Reverse Osmosis System

Westgold Reverse Osmosis Water Treatment System

RWTS 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 RWTS 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

RWTS 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 RWTS difference.

Arsenic & Cyanide Treatment Plant: Gold Ridge Mining

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RWTS was awarded the contract to build an arsenic and cyanide removal system for Gold Ridge Mining Ltd’s St Barbara site in the Solomon Islands.

The site was a tailing storage facility used in a gold production process. The facility was contaminated with levels of cyanide arsenic and other heavy metals.

RWTS build a treatment system in Australia before shipping it to the Solomon Islands for installation. The system included a lime dosing system for pH control, a ferric chlorite injection system to bind particles and a Chlorine dioxide generator for oxidisation and cyanide destruction.

A part of the contract RWTS facilitated the rectification of the storage facility to include rebuilding access and roads, rebuild a chemical storage facility and installation and commissioning of a water treatment system.

RWTS successfully completed the project and the system is currently in full operation.

Chemical Dosing System & Plant Monitoring: Bungaroo FIFO Camp

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Accommodation villages for workers in remote locations rely on a secure water source as their drinking water supply. In many instances, where water is transported in and stored, additional chemistry is required to maintain effective chlorine residual.

The RWTS water treatment plant has provided a turnkey means of disinfecting the water supply in the Bungaroo FIFO camp to allow for safe consumption. For added convenience, a state-of-the-art monitoring system has been integrated to allow for full remote telemetry communication with the plant operator. This provides the plant operator with the ability to consistently check on the status of the plant and tank level from the convenience of their office.

The RWTS containerised water treatment solution caters to the needs of small rigger camps through to large stay-over camps. Our systems include the highest quality analysers and pumping equipment to deliver effective pH correction and chlorine dosing.

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