Water Journal : Water Journal April 2015
APRIL 2015 WATER • Readily lifted out for maintenance or storage; • A short shutdown to make electrical connections was all that was required – no messy draining of the ditch and no upset of the process. The air delivery system was kept separate from the existing header, and the control system was kept simple to supply a base load of oxygen to the process. The existing blowers and diffusers still control and manage the air demand for the process, tracking changes due to the diurnal flows into the plant. During the remainder of the year when the new aerator/mixers are not required, there is a cross- connection valve that can be opened to allow the new blowers to supply the old diffuser header. This allows South East Water to make efficiency gains with the new blowers when the plant is in normal operation. The final stage of this project was to install additional emergency generation capacity and a new electrical feeder and distribution board for the increased demand. This was achieved with minimal disruption to the operating plant. The new generators, one blower and four aerators were installed and ready for trials during the 2014–15 summer period, which was a success with the plant meeting the demand of the increased load. The second blower installation and completion of the switchboard changes were finished in February 2015. THE RESULT • The new blower technology will deliver lower operating costs for South East Water; • The works were completed with minimal disruption to the ‘live’ plant; • South East Water has deferred a major capital expansion; • The flexible design allows the operator to more effectively deal with abnormal conditions, as well as allowing the extra equipment to be reused in any future expansion or even removed and used at another plant. UGL successfully delivered the system in time for the critical summer period, allowing South East Water to manage the high but short-term increase in seasonal load, while getting the most out of the existing assets. To discuss this or other innovations, please join us for a coffee at UGL’s café in the Delegates Lounge at Ozwater’15, or contact Morris Taylor from UGL on +61 419 145 490, or email morris. email@example.com [Mike, might ask them if they want to have a button with stand no here?] Bubble pattern of the new submerged aerator. One of four new aerators installed at the Boneo STP. The aerators are not fixed to the floor, ensuring easy lift-out for maintenance or storage.
Water Journal February 2015
Water and CSG