Vivendi Water, Australia optimises wastewater treatment plant design with EFOR.
Vivendi Water, Australia has recently used EFOR to optimise nutrient removal treatment plant design and to identify the most appropriate operational strategies during maintenance of the plant’s aeration equipment in the activated sludge tanks.
Vivendi Water, Australia in Joint Venture with Walter Construction has recently been awarded a $A150 million contract with Sydney Water Corporation to design and construct a major wastewater treatment ant water recycling plant in Wollongong just south of Sydney. The plant includes a new 40,000 m3/d nutrient removal plant (160,000 pe) and a 20,000 m3/d water recycling plant using microfiltration and reverse osmosis membrane technologies.
The biological treatment plant is designed to process 40.000 m3/d as an average flow and to meet effluent demands of ammonia less than 1 mg/l and Total N less than 8 mg/l. The treatment plant is designed to be the Quattro-Denipho type, a trademark of Krüger A/S (Denmark) This treatment plant type operates with alternating aeration in the activated sludge tanks and a dynamic flow pattern, which opens up for a flexible operation, which easily can adapt to varying influent conditions.
During maintenance of the aeration equipment in the process tanks, one tank will be unavailable for service for a number of days at a time. Therefore special operation has to be used for the remaining process tanks to enable the plant to continue to produce a high quality effluent. In order to investigate to what extent the treatment plant can meet the effluent demands during these maintenance periods, different operational strategies were investigated with EFOR.
These investigations showed that it was possible to adapt the operation on the plant so that it can treat greater than 75 % of the normal flow, and still meet the desired effluent demands at the design minimum operating temperature.
In this way it was demonstrated that it will be possible to carry out maintenance of the aeration equipment and maintain effluent quality standards.
To get more information:
www.dhisoftware.com\efor
rpearson@vivendiwater.com.au