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Category Archives: Water Treatment

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.

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.

Sewage and Potable Water Treatment, and Water Reclamation: Horizon Shores Marina
Horizon Shores Marina

RWTS facilitates the servicing and ongoing growth of Horizon Shores Marina.

To date, RWTS has upgraded the sewage treatment facility, potable water system and water reclamation plant to ensure Horizon Shores Marina’s site complies with the Gold Coast City Council regulations.

Arsenic & Cyanide Wastewater Treatment System: Gold Ridge Mining

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RWTS was awarded the contract to build an arsenic and cyanide wastewater treatment 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.

Ultrafiltration: Darling Downs Eggs

RWTS, in conjunction with client Integrated water management, delivered a complete water solution to the Darling Downs Eggs precinct.

This project was aimed at supporting the improved health of the birds, ultimately minimising mortality, yielding higher gross margins overall for the farmers. Water treatment a key ingredient to the survival of the birds found that we would treat the sites bore water through a  nanofiltration process with media filtration front end and calcium for hardness absorption on the permeate stream.

The additional water make up source came from the farms turkeys nest where raw surface water was treated through glass media filtration, disinfected with sufficient oxidant before entering the ultrafiltration system for further treatment. The RWTS design included our Improved PVC inside – outside  hollow fibre canister membranes complete on 316 industrial grade stainless steel equipment skid. The system was powered through a Mitsubishi PLC and HMI with Ewom modem for remote telemetry access to allow for plant manipulation and performance trending from the office with remote SMS alarm capability.

The ultrafiltration engineered package is designed to treat up to 10 kl / hr of permeate with redundancy @ a 98% efficient recovery rate. Both treated water sources make up the 120 KL panel holding tank which is then further recirculated and treated with a specific formulation of Chlorine dioxide maintaining bacterial loading within the water stream, keeping a residual oxidant throughout the water network.

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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