Home' Future Water : Future Water 2017 Contents 66 >> Future Water >> Australian Water Management Yearbook
WATER + WASTEWATER TREATMENT
trigger higher power consumption. A significant reduction in
power consumption after the plant upgrade can be attributed to a
reduction in the membrane scour air flow rate, made possible by
Evoqua Water Technologies’ new aeration technology.
The MemPulse® system, deployed with the new-generation
MEMCOR® B40N membrane bioreactor membrane modules used
on the plant upgrade, generates random rapid pulses at each
Membrane bioreactor module using a continuous air flow without
the use of valves or other moving parts. Scouring effectiveness
is increased and power consumption is reduced. The previous-
generation MEMCOR® B10 R membrane bioreactor modules
required an air scour flow rate of 443 cubic metres per hour per
membrane tank. This compares to 224 cubic metres per hour and
280 cubic metres per hour per membrane tank for the four-rack
and five-rack assembly configuration respectively for the current-
generation B40N membrane bioreactor modules. The result is a
reduced overall specific power consumption per megalitre treated.
Operator labour hours
The plant is highly automated. Both the bioreactor and the
membrane operating systems typically only require operator
intervention for process adjustments once a day, during equipment
isolation for planned and breakdown maintenance, and during
clean-in-place (CIP). Controls are in place for bioreactor level
and DO control, automatic ramp-up and ramp-down of filtrate
production based on the level in the on-site two-megalitre
industrial water tank, scour air flow, relaxation cycles, and
maintenance cleans. Operator labour requirements were estimated
for a typical day. Usual tasks performed by operators include
monitoring the process on SCADA, physical inspection of plant
components, sampling and lab work. In addition to the daily effort,
operators spend some time every six months on instrument
calibrations. Not included in these numbers are the hours that
operators spend carrying out CIPs. MCs typically run automatically,
and do not require operator intervention.
Gerin James, Global Product Manager MBR, has over 10 years’
experience in water and wastewater field in Australia, Asia and
North America. Working in variety of roles encompassing: R&D,
design, supply, commissioning and technical sales.
Peter Zauner, Process Engineer, has been working in the water
industry since 2004. Working first for Sydney Water, he later
started in the MEMCOR® membrane R&D division, where he
focused on the development of MBR module aeration system
design – known as MempulseTM. He is responsible for process
design and commissioned a number of potable water and
wastewater membrane filtration plants.
Landers, G., P. Zauner (2006) ‘Experiences from Operating a
Membrane Bioreactor (MBR)’. Proceedings of the 2006 AWA
Engineers and Operator Conference.
Branch, A., G. James and T. Trinh (2016). ‘Membrane Ageing and
Replacement – Impact on Pathogen Removal in Full Scale MBR’.
Proceedings of the 2016 American Water Works Association
Membrane Technology Conference & Exposition.
Pettigrew, L., M. Angles and N. Nelson (2010). ‘Pathogen removal by
a membrane bioreactor’. Journal of the Australian Water Association
After nine years of operation, Sydney Water considered options to cater for the increased demand for recycled water at North
Head Wastewater Treatment Plant. An audit performed by the supplier of the original membrane equipment informed Sydney
Water’s choice of upgrade option.
The selected option included the replacement and upgrade of MEMCOR® membrane modules with a new-generation product
by the original supplier.
The upgrade that was done online while the plant was producing recycled water resulted in a plant that now produces
more recycled water without compromising filtrate quality at lower dollar-per-megalitre energy costs compared with the
Examining pre- and post-upgrade plant operating data allowed findings to be made on the performance of nine-year-old
membranes compared with new membranes.
The upgrade was also an opportunity to upgrade controls incorporating operating experience from previous years.
Membrane bioreactor plant at North Head
Links Archive Future Water 2016 Future Water 2018 Navigation Previous Page Next Page