Bathurst Regional Council recently installed a supernatant recycling system into the filtration plant in the town water supply, which serves a population of approximately 37,000. This will help conserve potable water and provide substantial water savings in the long term.
It is estimated that the annual water consumption of about 6,000ML and the wastewater to be recovered could be in the order of 192ML per year. The overall water to be saved is estimated to be 13,000ML over 50 years.
The Bathurst Regional Council recycle system, installed by Ted Wilson & Sons (TWS) of Blayney using equipment supplied by CST Wastewater Solutions , recovers and disinfects the filter backwash water at the plant.
It is said that disinfection of backwash supernatant is not widely used in Australia, however, it can recover up to 10% of raw water supply, while avoiding the need to discharge flows into river systems.
The new system involved the construction of a supernatant pumping station and associated pipework to enable the automatic recycling of supernatant from the sludge lagoons into an in-ground well, and then into the first chamber of the rapid mix tank.
The solution
CST Wastewater Solutions' Berson UV disinfection system was fitted between the pumping station and the rapid mix tank to disinfect the recycled water from the sludge lagoons before returning it to the rapid mix tank.
It is designed to fully disinfect up to a flow rate of 60L/s, and a variable power control that enables UV dosage to be adjustable to suit operating conditions.
"It’s an interesting project because backwash supernatant disinfection is not widely used in Australia," says CST Wastewater Solutions managing director, Michael Bambridge.
"The advantage is that the method recovers up to 10 per cent of the raw supply, which reduces the demand on the water storage system and avoids the need for waste flows into the river system.
"UV disinfection is relatively new. Backwash water potentially contains Cryptosporidium and Giardia, and UV treatment is more effective than chlorination for these two bacteria."
Mr Bambridge said that the new generation Berson SUMMIT lamps have a higher output power than earlier lamps and also, with SEC power control, a longer life - up to 12,000 hours instead of 10,000 hours or even less with the old-type stepped power.
"We chose CST Wastewater Solutions to supply the UV disinfection equipment because we had worked together on previous projects. All went well, as with other work we have done with them. The equipment had been wet-tested by the manufacturer Berson before it left the factory in Europe," says Rex Wilson of TWS.
"Everything was straightforward and I would recommend CST Wastewater Solutions to other organisations thinking of installing UV disinfection in their wastewater treatment system."
It is estimated that the annual water consumption of about 6,000ML and the wastewater to be recovered could be in the order of 192ML per year. The overall water to be saved is estimated to be 13,000ML over 50 years.
The Bathurst Regional Council recycle system, installed by Ted Wilson & Sons (TWS) of Blayney using equipment supplied by CST Wastewater Solutions , recovers and disinfects the filter backwash water at the plant.
It is said that disinfection of backwash supernatant is not widely used in Australia, however, it can recover up to 10% of raw water supply, while avoiding the need to discharge flows into river systems.
The new system involved the construction of a supernatant pumping station and associated pipework to enable the automatic recycling of supernatant from the sludge lagoons into an in-ground well, and then into the first chamber of the rapid mix tank.
The solution
CST Wastewater Solutions' Berson UV disinfection system was fitted between the pumping station and the rapid mix tank to disinfect the recycled water from the sludge lagoons before returning it to the rapid mix tank.
It is designed to fully disinfect up to a flow rate of 60L/s, and a variable power control that enables UV dosage to be adjustable to suit operating conditions.
"It’s an interesting project because backwash supernatant disinfection is not widely used in Australia," says CST Wastewater Solutions managing director, Michael Bambridge.
"The advantage is that the method recovers up to 10 per cent of the raw supply, which reduces the demand on the water storage system and avoids the need for waste flows into the river system.
"UV disinfection is relatively new. Backwash water potentially contains Cryptosporidium and Giardia, and UV treatment is more effective than chlorination for these two bacteria."
Mr Bambridge said that the new generation Berson SUMMIT lamps have a higher output power than earlier lamps and also, with SEC power control, a longer life - up to 12,000 hours instead of 10,000 hours or even less with the old-type stepped power.
"We chose CST Wastewater Solutions to supply the UV disinfection equipment because we had worked together on previous projects. All went well, as with other work we have done with them. The equipment had been wet-tested by the manufacturer Berson before it left the factory in Europe," says Rex Wilson of TWS.
"Everything was straightforward and I would recommend CST Wastewater Solutions to other organisations thinking of installing UV disinfection in their wastewater treatment system."
12.06.2012
