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Category Archives: Reverse Osmosis

Canstruct | Water Treatment Plant

Our client, Canstruct chose a custom built surface water treatment plant to produce safe and reliable potable water for human consumption.

Client: Canstruct

Location: Northern Territory

Solution: 40ft containerised Surface Water Treatment System

Industry: Agriculture

 

BACKGROUND

Canstruct are constructing new and upgrading existing facilities to support industry activity that is requiring a suitable water treatment facility to cater for persons on site.

RWTS was successfully awarded the contract to supply a 40ft containerised surface water treatment system to produce safe and reliable potable water for human consumption.

When accessing the design of the surface water treatment plant we took into account some key consideration based on site specific risks and project requirements.

Requirements for the WTP for this application were as follows:

 

  • Variable site loads – load swings and variable quality raw water characteristics
  • Seasonal Variance affecting organic loads, TOC Levels and Algae Levels in raw water supply
  • Upstream Catchment Assessment shows the source water as Category 4
  • Upstream variability in raw water quality including cattle farming – cryptosporidium risk is high.
  • High Protozoa risks associated with the source water combined with the location of the catchment and temperature averages.
  • Indicative raw water test results show an extremely low LSI index (corrosive Index rating) resulting in the design requiring remineralisation as an addition to the primary process requirement.
  • 20 year design life with an acceptable ongoing cost

THE RWTS SOLUTION

CUSTOM BUILT WATER TREATMENT PLANT

RWTS designed and constructed a surface water treatment plant with a nominated design flow rate to provide a minimum of 75,000 litres per day.

The nominated recovery range for this system was 85% – with a worst case expected recovery during very high solids loading periods of 55%.

Raw water required for the 20 kl per day potable water was between 88,500 litres per day minimum and as high as 136,000 litres per day – depending on raw water quality.

There was several stages of the water treatment process implemented into the design and construction of this customize water treatment plant including;

 

  • Stage One – Chemical Dosing
  • Stage Two- AFM Media Filtration
  • Stage Three – Ultrafiltration
  • Stage Four – GAC Carbon Media Filtration
  • Stage Five – Ultraviolet Disinfection Post Filtration
  • Stage Six – Calcite Media Remineralisation Filtration
  • Stage Seven – Chlorine Dosing For Disinfection Post Filtration
  • Stage Eight – Chlorine Dosing And Ph Correction For Treated Water Storage Facility

 

OVERVIEW OF DESIGN AND SYSTEM FITOUT

The following key summary points outline the fitout of the system:

 

  • Electrical Control Panel/Switchboard – Exceeds AS 3000 Requirement
  • Custom Fabricated 40 Foot Container Based Building with Air Conditioning, Vinyl Flooring, Fridge Panel 50 mm Thick Insulation Panel Lined Internal Roof and Walls for Temperature Control.
  • Allen Bradley Micro-logix series PLC and Colour 10 inch HMI Screen Interface
  • Remote Dial In and SMS out E-Won Cosy Modem Platform for remote assistance support and alarm notifications.
  • Industry Standard high quality electrical components such as Schnieder, Hager and Finder.
  • 415 volt/240 volt segregated from 24 volt compartment
  • Overloads and Circuit breakers accessible from safe outer door to internal retainer door mounted position – no exposed terminals
  • Earth Leakage to AS 3500.
  • External Building Colour of clients choice

The water treatment system included a Grundfos CRIE15 Series duplex multistage pump set complete with variable speed drive motors. A PID Pressure targeting software control via an Allen Bradley PLC/HMI package was installed.

The pump set was sized to ensure each pump delivered 15l/sec @40 mtrs delivery head, allowing a duty standby control methodology, which allowed a final duty achieved of 10 ltrs second at 400 kpa.

A flow meter was installed on the treated water delivery line out of the system to monitor discharge flows. This would ensure the data logging of usage volumes and peak flows as well as ensuring if there were any issues an alarm would be triggered to alert operations immediately.

Results:

There was significant consideration into the site-specific risks for treatment and delivery in design and construction to ensure the final filtered and disinfected water in potable water storage complied with the Australian Drinking Water Guidelines (ADWG).

RWTS delivered a potable water treatment plant that provided a daily minimum of 75,000 litres of safe and reliable potable water for human consumption.

The water treatment system was designed and fabricated in a transportable/semi-permanent or permanent installation arrangement to provide continuous service with the required maintenance for a 20 year life expectancy.

NEED AN INNOVATIVE SYSTEM THAT DOES NOT FAIL?

If you are wanting a water treatment system that works all day every day with the ability of remote monitoring, please call one of our friendly engineering team today to discuss your waste water issues and how we can help.

Griffith University Reverse Osmosis Water Treatment System

RWTS was successfully awarded a contract at Griffith University to deliver a Reverse Osmosis water treatment system to supply demineralised water to the lab sinks at a nominated flow rate.

Client: Griffith University

Location: Brisbane

Solution: Reverse Osmosis water treatment system

Industry: School

 

BACKGROUND

Griffith University recently constructed a high end laboratory in their new state of the art ‘Aviation Building’. Griffith University required purified water for cooling, cleaning and sampling and testing requirements, within these laboratories.

RWTS were successfully awarded the contracted portion to supply a suitably design two pass Reverse Osmosis (RO) water treatment system, with prefiltration and loop line disinfection to supply demineralised water to the laboratory sinks at a nominated flow rate.

THE RWTS SOLUTION

REVERSE OSMOSIS WATER TREATMENT SYSTEM

The Griffith University reverse osmosis and demin polishing system uses RO technology to remove dissolved salts from a suitable raw water source.

The system designed and built for Griffith University is configured specifically for slightly variable raw water TDS to accommodate seasonal changes in raw water quality being delivered by Urban Utilities.

The RO water treatment system is designed using a staged approach.

The first stage, “Pre-treatment” removes suspended solids down to 1 micron in size, stripping the total chlorine from the water and removing calcium/magnesium hardness, iron, manganese and aluminium, before the final treated water is fed to the reverse osmosis system for further treatment.

The reverse osmosis water treatment system is a “double pass” system, with the permeate from the first pass sent through a second pass to produce a high quality permeate that is always less than 1 us/cm in quality and typically averages less than 0.5 us/cm.

The last stage of treatment is ultraviolet disinfection combined with mixed bed demineralisation resin, which removes bacteria and trace solutes such as sodium and chloride down to extremely low levels, to produce a treated water quality that is as low as 0.1us/cm in quality.

A water storage tank, a treated water loop delivery pump unit and the required valving and instrumentation completes the delivery of the treated water to the laboratory. In addition multiple outlets are provided a low pressure demineralized water supply at all times by the system.

The Griffith University reverse osmosis system is designed to operate with advanced automatic flux control methodology.

This methodology involves the utilization of automatic modulating valves on the concentrate and recycle streams of the system, flow meters on the concentrate, recycle and permeate streams for flow feedback to the PLC.

The water treatment system automation is controlled through the RWTS proprietary Allen Bradley HMI PLC combined with Bacnet control back to the University BMS system. This system provides accurate and reliable control based on operator adjustable setpoint targets for production and system membrane flux.

Results:

Purified water for cooling, cleaning and sampling and testing requirements within the Griffith University laboratories at a nominated flow rate.

Seamless automation and programming to ensure equipment is easy to operate and maintain, and not fail when the placed under full demand.

NEED AN INNOVATIVE SYSTEM THAT DOES NOT FAIL?

If you are wanting a system that works all day every day with the ability of remote monitoring, please call one of our friendly engineering team today to discuss your water treatment options for your beer brewery.

Wastewater Treatment Plant and Reverse Osmosis System: Westgold Resources

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

 

Client: Westgold Resources

Industry: Mining

Systems: EcoFarmer Wastewater Treatment Plant and Brackish Water Reverse Osmosis System

 

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.

Specialised Recovery Reverse Osmosis System: Manufacturing Industry
Reverse Osmosis System

RWTS where engaged to engineer a solution in providing a recovery reverse osmosis system allowing for our client to maximise their wastewater reclamation potential on their production water streams.

The treated water stream extracted from the process was further used in the production facility, reducing costs associated with water and waste handling. The system design was configured as a reverse osmosis filtration process, mechanically filtering and separating the waste from the treated permeate water. The challenges with the wastewater from the manufacturing facility were:

 

  • the higher than anticipated inlet water temperature of 65 degrees celsius;
  • conductivity between 2000 – 9000 Ms (depending on the process being disposed of); and
  • extremely high levels of COD.

To overcome this, RWTS completed the design with 316 stainless steel 8040 filter membrane vessels, full stainless high pressure piping and C PVC manifold pipework on the permeate stream. The membrane selection was the key to the plant design and success with RWTS consulting a membrane manufacturing specialist in the United States solely focusing on membrane technology. Instrumentation of choice to keep in tying with the remainder of the factory was Krohne with the use of a front end Brix analyser, mag flow totalising and instant flow meters the valving being branded keystone spring return close.

System integration was tied in together with a Allan Bradly PLC 800 series and HMI panel view plus 7 screen allowing for the ability of remote telemetry access through a Ewon modem allowing off site operator to dial in and see visually see the plant operation. The integration also allowed for a full automated chemical cleaning ‘CIP’ process minimising the risk of chemical handling by onsite plant operators.

The entire build and engineering was completed in house with the RWTS team providing a complete solution.

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