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FEATURED CASE STUDIES & LATEST NEWS

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Cannonvale Medical Centre Water Treatment System post Cyclone Debbie

Wednesday, 19 April 2017

Severe Tropical Cyclone Debbie made landfall near Airlie Beach on the Nth QLD coast 28th March 2017. It was a slow-moving category 4 system that generated wind gusts exceeding 160 km/hr, heavy rainfall and storm surges along the Nth QLD coastline. 27 hours later, after having tracked inland over Airlie Beach, Proserpine, Cannonvale and Collinsville it was downgraded to a Tropical Low. Dowdens Pumping & Water Treatment's Proserpine Branch is again open for business.

Cannonvale was amongst the hardest hit regions during Cyclone Debbie, so it was no surprise to Dowdens Pumping & Water Treatment's Proserpine Branch to hear Queensland Health had been advised they couldn't be guaranteed potable water supply to their Whitsunday Community Health Centre located in Cannonvale immediately after Cyclone Debbie.

Luckily Dowdens Pumping & Water Treatment's Head Office in Mackay had a portable Ultrafiltration Treatment System available, capable of supplying up to 70,000 litres of potable water per day. Queensland Health and the Whitsunday Community Health Centre in Cannonvale instructed Dowdens Pumping to supply/install the unit immediately on a temporary 'Hire' agreement in-case all mains water supply was lost.

There were two water sources available at the time - the mains water supply or bore water from the Proserpine Hospital. Queensland Health instructed Dowdens to connect the UF Treatment System to the bore water supply, in an effort to remain as self-sufficient as possible post-Cyclone Debbie.

PURION - Water Treatment Products by the Dowdens Group

Dowdens Pumping have previously completed numerous bore water filtration systems treating bore water with our own brand of PURION Iron Removal Filters, so this emergency UF Treatment System was quick and easy to install. PURION Iron Removal Filters pre-treat the bore water before running it through the Ultrafiltration System which then doses the filtrate with liquid chlorine to further disinfect.

Once treated Dowdens Pumping manually transported numerous loads of the potable water from the Proserpine Hospital (where the UF System was installed) directly to the Whitsunday Community Health Centre in Cannonvale, where it was stored in a potable water grade storage tank. The treated water was then used to supply the medical centre. The entire supply/installation and commissioning was successfully completed on Saturday 1st of April - only 4 days after Cyclone Debbie had hit.

If you are ever in need of potable water during a storm or emergency contact Dowdens Pumping & Water Treatment. Dowdens only require access to a reasonable source of water (bore, dam, creek) and power (generator or mains power) and we can guarantee same day potable water supply, in any situation!

Dowdens Pumping & Water Treatment installing a temporary Water Treatment Plant at Proserpine Hospital [Cyclone Debbie 2017]

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Coppabella Township Sewage Treatment Plant Upgrade

Case Study

Customer: Aurizon Holdings Limited

Location: Coppabella, QLD

Specifications & Features:

Aurizon Holdings Limited

Following on from the successful construction and commissioning of the Coppabella Water Treatment Plant Aurizon Holdings Limited engaged Dowdens Pumping & Water Treatment [Mackay & Brisbane Branches] to deliver a much needed Sewage Treatment Plant (STP) Upgrade at their Coppabella Township, located on the Goonyella Rail Corridor (the world's largest metallurgical coal rail system) - 159 kilometres South West of Mackay, QLD. The Coppabella STP Upgrade project entailed the addition of an Ultra-Filtration (UF) 'Polishing' Plant onto the existing STP. Dowdens new UF 'Polishing' Plant can produce up to 180 kL/day of treated Class A effluent.

The township of Coppabella was primarily designed and built to service the junction of two railway lines (one from Goonyella Coal Mine and one from Saraji Coal Mine) and to provide accommodation to the regions coal mine workers in work depots. The town is wholly owned and operated by Aurizon Holdings Limited and contains: stations, residences, single-quarters, work depots, hotel, a shop, swimming pool, football oval, caravan park, school, ambulance, fire brigade, the recently completed Dowdens whole-of-town Water Treatment Plant and of course the upgraded Sewage Treatment Plant which is now capable of producing 180kL of treated Class A effluent per day for above ground irrigation applications. The local Coppabella Golf Course is one area where this treated effluent is used for irrigation.

After successfully completing various projects for Aurizon Holdings Limited, Dowdens won the tender to provide the process design together with equipment supply, civil construction, installation, commissioning and training for the STP plant operators. The construction phase of the project began with extensive civil works being undertaken to raise the ground level for the new STP components. The pre-existing STP has historically been subject to flooding during heavy rainfall events due to the sites proximity to the local creek. Upon surveying the sites substrate a water table was discovered 1m below ground level.

Working with local Civil Engineers Cardno a substantial foundation was designed / laid to ensure the new buildings, plant components and 4,000 tonne water tank would be stable and remain above the flood plain even during heavy rainfall. Once foundations were laid Dowdens began construction of the 400,000L lined stainless steel water tank, new building to properly house the STP process equipment, an operators office, laboratory facilities and a back-up generator used to power the entire STP in the event of power loss.

Dowdens Pumping & Water Treatment Coppabella Township Sewage Treatment Plant Upgrade [Coppabella, QLD]

Details:

After extensive effluent testing and thorough examination of the existing STP process a UF 'Polishing' Plant was designed by Dowdens inhouse Water Treatment Engineering Dept. capable of processing up to 180kL of partially treated sewage effluent per day. The partially treated sewage effluent was rated as Class C and needed to be treated to an acceptable level (Class A) to then be used for above ground irrigation. This treatment process consists of three stages of filtration and sterilisation, including UF. This three-stage process runs as follows:

  • Primary treated effluent from the existing STP (Class C quality) is transferred to a 45,000L Glass Media Filtration (GMF) feed tank via duty / stand-by submersible pumps on demand.
  • In Stage 1 the clarified effluent from the existing STP process is first dosed with sodium hypochlorite as primary disinfection, to reduce biofouling of the Glass Media. It is then passed through the duty/stand-by Glass Media Filters which reduce particulates, suspended solids and turbidity from the GMF filtrate stream. This ensures no large particles damage the UF membranes in Stage 2.
  • In Stage 2 the GMF filtrate is then passed through UF treatment process which incorporates 5% 'cross-flow' to maximise the filtration run-time between back flushes (triggered by high trans-membrane pressure). The systems consists of 8 individual outside-in PVDF membranes which reduce turbidity to less than 1 NTU (Nephelometric Turbidity Units) whilst removing any particles greater than 0.0002mm from the permeate stream. The UF feed is again dosed with sodium hypochlorite to assist with cleaning the UF membranes from biological and organic fouling between the backwash and Chemical Enhanced Back Flush (CEBF) cycles.
  • In Stage 3 the UF filtrate is passed through duty/stand-by Activated Carbon Filters (ACF) on demand to reduce colour and odour (by removing aromatic compounds) as a final 'polish' before being fed to the treated effluent tank. The ACF filtrate is then dosed with sodium hypochlorite as a final disinfection of the treated effluent prior to it entering the treated effluent storage tank for dispersal via above ground irrigation systems. Dowdens provided a centralised, custom designed / fabricated, packaged chemical dosing system for this UF 'Polishing' Plant which included a 1000L Chemical Storage tank, a splash-proof racking area housing 5 individual Chemical Dosing pumps - complete with an internal bund and double containment dosing line connections.

When the treated effluent arrives in the 400kL stainless steel tank a recirculation system pumps it through a chlorine analyser and back to the treated effluent tank. The chlorine analyser then controls the residual free chlorine level in the treated water and will start / stop a chemical dosing pump as required to maintain the pre-set residual free chlorine level.

Each of the GMF, UF and ACF processes are periodically backwashed and cleaned, with residual waste being fed to a nearby buffer dam where chlorine is allowed to dissipate. Based on the level in the buffer dam and the level in the treated effluent tank, the water may then be returned to the pump station at the front of the STP for reprocessing.

With a history of successful installations over the past 20 years throughout the Queensland Mining Sector Dowdens Pumping & Water Treatment have the ability to expertly design / manufacture / install and commission specialised pumping and water treatment solutions that are built primarily in-house & onsite to client's specific unique requirements. The Coppabella STP Upgrade project is yet another example of Dowdens unparallelled capability to deliver specialised long-term engineered fluid handling solutions from project inception through to final commissioning / handover.

Dowdens Pumping & Water Treatment Coppabella Township Sewage Treatment Plant Upgrade [Coppabella, QLD]

 
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Game changing GRUNDFOS SCALA2 PUMPS now at Dowdens

Tuesday, 14 March 2017

Dowdens Pumping & Water Treatment are your local pump experts and are Authorised Grundfos Dealers. Dowdens are Mackay's ONLY Authorised Grundfos Dealer & Dowdens Rockhampton branch is also an Authorised Grundfos Dealer. Grundfos pumps are market leaders, committed to providing new and innovative products that take comfort and simplicity to the next level, for these reasons we sell and recommend the new SCALA2 domestic pump.

Grundfos has long been regarded for their high quality and reliable pumps. The Grundfos SCALA2 takes design innovation, comfort and simplicity to the next level and is set to be a game changer in domestic boosting. The NEW Grundfos SCALA2 is a robust, fully integrated, self-priming pump suitable for use from both above and below ground water sources. The compact system features a pump, motor, tank, sensor, drive and non-return valve in one compact unit that is quick and easy to install.

The SCALA2 is an energy efficient pump featuring an integrated speed controller that ensures constant water pressure regardless of variations in demand or inlet pressure. For those living in areas of poor power supply or those that are sometime affected by power outages, the SCALA2 can also be run on a generator, due to its ability to be able to handle varying voltages.

The variable speed controller also matches the power consumption with the required water output, which also helps to conserve energy and reduce your energy bills. To protect the pump and help ensure a long life, the SCALA2 includes a range of protective features. Dry run protection automatically stops operation when the water source runs out, to help prevent damage, and the anti-cycling feature detects any unnatural cycling and alerts the user via the protection indicator on the control panel.

Another unique benefit of the SCALA2 is its quiet operation, thanks to the permanent magnet motor and water cooling technology. The high efficiency motor is significantly quieter than traditional speed-controlled motors and the SCALA2 is cooled by the water it pumps, eliminating the need for a noisy fan. This makes the SCALA2 one of the quietest domestic boosting pumps currently available on the market.

For ease of selection, the SCALA2 suits most domestic pressure boosting applications and is capable of supplying water for small single level homes up to larger multi-storey homes.

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Mackay Renal Unit UV Sterilisation System

Case Study

Customer: Queensland Health

Completion Date: 11/02/2014

Location: Mackay, QLD

Specifications & Features:

Dowdens Pumping & Water Treatment have successfully designed, installed and commissioned a specialised Ultraviolet filtration system for the Queensland Health Mackay Renal Unit.

Project Requirements: The original system operated by pumping town water to individual filtering stations where the water would pass through a 5 micron, 1 micron and carbon filter on its way to the dialysis machine (which has an internal reverse osmosis filter).

The issue Dowdens faced was the original system filters were only lasting between 5 - 15 hours, and by this stage they were black and needed to be replaced!

After reviewing detailed water test results, Dowdens designed a compact, reliable system where the existing pump was upgraded, a water softening unit was added to remove iron, calcium and manganese. Large cartridge filters were also installed to pre-filter the water before it entered a dedicated UV steriliser.

Using the above system the Mackay Renal Unit now only needs to replace the systems filters every 7 to 10 days - saving thousands of dollars in ongoing system maintenance costs!

Mackay Community Health Services

Details:

Key Plant Features:

Mackay Renal Unit UV Sterilisation System

 
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Coppabella Township Water Treatment Plant

Case Study

Customer: Aurizon Holdings Limited

Location: Coppabella, QLD

Specifications & Features:

Aurizon Holdings Limited

Aurizon Holdings Limited have engaged Dowdens Pumping & Water Treatment [Mackay & Brisbane Branches] to deliver a Water Treatment Plant (WTP) at their Coppabella Township, located on the Goonyella Rail Corridor (the world's largest metallurgical coal rail system) - 159 kilometres South West of Mackay, QLD.

The township of Coppabella was primarily designed and built to service the junction of two railway lines (one from Goonyella Coal Mine and one from Saraji Coal Mine) and to provide accommodation to the regions coal mine workers in work depots. The town was established in three stages, with the first being completed in 1971, the second in 1977 and the third and final stage in 1984. The town is wholly owned and operated by Aurizon Holdings Limited and contains: stations, residences, single-quarters, work depots, hotel, a shop, swimming pool, football oval, caravan park, school, ambulance, fire brigade and of course the new Dowdens Water Treatment Plant which is capable of producing of up to 900kL of potable water per day.

Dowdens engineers and service crews designed, manufactured, installed and commissioned the Coppabella WTP to treat raw water to Australian Drinking Water Standards. As the Principal Contractor Dowdens were provided a set of feed supply water parameters coming into the WTP, and water quality requirements for the delivery of the town's drinking water. From these basics the $2.5 million project came to fruition. The Dowdens WTP replaced the existing water softening plant (located adjacent to the new WTP), whilst future-proofing the growth of the Coppabella township by increasing the WTP's maximum daily drinking water production capacity up to 900 kL/day.

The new WTP is completely automated and user adjustable via the GE Human Machine Interface (HMI) situated in the purpose built site Control Room / Office, minimising the need for direct operator interaction / intervention on-site. A dedicated remote monitoring / alert messaging system was also provided so that in the event of a critical alarm the EDAC 700 RTU will call the WTP Operators advising them of system alarm status via pre-recorded spoken messages.

Security of the WTP site was significantly improved with the establishment of a controlled compound restricting access to authorised personnel only (pictured below). Dowdens also eliminated the need for repetitive manual handling of typical WTP chemical consumables on-site (Salt, Liquid Chlorine and Soda Ash) via the integration of various bulk storage systems.

Dowdens Pumping & Water Treatment Coppabella Township Water Treatment Plant [Coppabella, QLD]

Details:

Dowdens were successful in the tendering process due to:

  • The proximity of Dowdens head office [Mackay] and ongoing presence in the region
  • Dowdens vast in-house engineering capabilities and proven competencies
  • High level of detail provided in the preliminary engineering proposal
  • Proposed Water Treatment Plants cost effectiveness

Dowdens coordinated the design, build and commissioning of the WTP from project inception through to final handover. This included, but was not limited to: preliminary design - detailed design - risk assessments (with client and consulting engineers) - preliminary civil works establishing the site (levelling site) - under boring Peak Downs Hwy for installation of raw water pipeline - installation of all underground services - pouring of slabs - construction of the Ion Exchange (IX) building - installation of process equipment - installation of all interconnecting pipework - electrical installation of control panel and field instrumentation / equipment - commissioning of instruments / equipment - commissioning of PLC program and HMI - successful completion of 'Proof of Performance' testing and all necessary operator training.

The inclusion of a unique Brine generation system was a novel approach that incorporated a salt bulk bag unloader (capable of lifting 1200kg bags - pictured below) and a proprietary piece of equipment from the USA [BRINE ExtremePro]. The IX system is flexible in its design and is capable of producing between 150 - 900 kL/day of potable water with the IX system constantly analysing and compensating for variations of incoming bore water hardness levels.

The existing water softening plant (located adjacent to the new WTP) and raw water supply needed to be retained during the new WTP construction. The old plant was decommissioned over a period of 3 months. Nearing project completion a wet weather event (February 2016) resulted in additional water flows through the WTP site causing some minor displacement / erosion of soil and stone that required a brief plant shutdown to rectify the damage. Dowdens performed this work efficiently and effectively eliminating any risk to the township's drinking water supply.

Dowdens Pumping & Water Treatment design philosophy for this project was: Cost Effectiveness - Current Best Practice - Ease of Installation - Simple & Effective Plant Operation - Plant Reliability & Reduced Ongoing Maintenance.

Water Treatment Plants Key Components are listed below:

Dowdens Pumping & Water Treatment Coppabella Township Water Treatment Plant [Coppabella, QLD]

 
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Community Pool Filtration System

Case Study

Customer: Longreach Regional Council

Location: Yaraka, QLD

Specifications & Features:

Yaraka Community Pool - Dowdens Pumping & Water Treatment Pool Filtration System InstallationLongreach Regional Council recently engaged Dowdens Pumping & Water Treatment's Mackay & Rockhampton branches to manufacture and install a specialised pool water treatment system for the Yaraka Community Pool in Yaraka (a small town in Central West Queensland located 220 kilometres south of Longreach).

This project began with Longreach Regional Council asking for tender submissions to fully upgrade the Yaraka's Pool onsite filtration & treatment systems. Dowdens Pumping & Water Treatment was successful in winning the tender thanks to our price competitiveness, delivery times and unique in-house fabrication capabilities. On hearing about the tender a representative from the Dowdens Rockhampton branch immediately attended the pool to properly assess and quote the job. It quickly became apparent that a specialised filtration system was needed due in part to the pools remote location (limiting the possibility of regular system servicing), and the extreme weather patterns (high temperatures, dust storms & limited / sporadic rainfall) experienced in Central QLD.

Dowdens then set about designing the new filtration system utilising inhouse Engineering, Workshop Fabrication & Mobile Pool Servicing Departments. The end result was a unique twin-filtration systems that was mounted onto a fabricated galvanised skid to aid in maneuverability, ease of installation & transportation. The skid base was fabricated specifically to fit the existing shed onsite.

Having all the system components plumbed up on a single sturdy base made installation easy as only the Pump Inlet, Pool Water Return and Wastewater Pipes needed to be connected and the system was ready to go. The skid comprised 2x Pool Glass Media Filters, 2x Pool Pumps and 2x Salt Water Chlorinators. The Salt Water Chlorinators are fully automated allowing for round the clock (controlled via sensors) pH and chlorine / acid dosing together with chlorine generation. This has drastically reduced the need for regular onsite water testing and manual chemical dosing at the community pool. On Dowdens recommendation Longreach Regional Council also purchased a Dolphin Robotic Pool Cleaner which has noticeably improved the pools cleanliness.

All design, manufacture, delivery and installation / commissioning was successfully completed by Dowdens well within Longreach Regional Council's delivery deadline of six weeks.

Yaraka Community Pool - Dowdens Pumping & Water Treatment Pool Filtration System Installation

Details:

The Yaraka Community Pool is now clean and ready for summer. The new equipment Dowdens supplied has reduced the need for costly regular maintenance whilst improving the automation of the pools chlorine levels - keeping the pool sanitised and chemically balanced at all times is extremely important for any community pool. Dowdens Pumping & Water Treatment's design philosophy for this project was simple: Cost Effectiveness - Ease of Installation - Simple & Effective System Operation - System Reliability & Delivering Greatly Reduced Ongoing Maintenance Requirements.

Yaraka Community Pool Filtration System ~ Key System Features & Components:


Yaraka Community Pool - Dowdens Pumping & Water Treatment Pool Filtration System Installation

 

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