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Tag Archives: Ultrafiltration System

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.

Wastewater Biological Treatment and Ultrafiltration System

RWTS custom-built a wastewater treatment back-end biological polishing unit designed within an ultrafiltration system. The system treated Class C effluent to that of a true Class A final release standard. 

The system was complete with front end glass media filtration, before water was filtered through the ultrafiltration membrane elements.

The membranes of choice for the wastewater biological treatment were the RWTS UF-PVDF-1060 hollow fibre filter housings with an effective filtration area of 78 m2. The membranes were configured to an outside-inside, with air sparge backwashing, forward flush, top and bottom backflush, and an independent enhanced backflush EBF cycle also coded within the PLC. The PVDF fibre allows for greater tensile strength when filters are exhausted and feed pressures rise, due to uncontrolled front end treatment. The ability to rejuvenate the fibre element is second to none; with an aggressive alkali and acid cleaning process the filters will bounce back yielding their intended designed flux. Other membranes constructed of improved PVC and simple PVC cannot withstand such harsh environments and are susceptible to fibre breakage, resulting in cross contamination of raw and treated water streams.

The system was constructed on a purpose-built, 316 stainless steel frame. All pumps utilised for filtration, backwash and chemical injection were Grundfos pumps to ensure durability and reliability.  The feed pumps being controlled by VSD which allowed for variable flow treatment through the day. Process control pneumatic valves used in this system were air torque actuators with separate limit switches and Ritork cast wafer valves were integrated. Burkert instruments were chosen by the client. Additionally, control automation was completed through an Allen Bradly 800 Series PLC and Panel view plus 7 – 9 inch HMI screen with a Ewon modem for remote telemetry access.

The membranes have been installed with individual isolation valves on all 3 streams allowing for the disconnection and replacement of the individual membranes units without isolating the system. Clear tubing has additionally been added to allow the operator to view the turbid backwash reject water exiting the system.

All in all, RWTS has encompassed the very best in equipment supply and design to deliver a high-performance, durable system which will see many years of trouble-free filtering.

The equipment was installed and successfully commissioned onsite by the RWTS electrical and programming division.

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