Water & Wastewater Asia September/October 2018

FROM THE GROUND | 25
Table 3: Cost savings of reusing tertiary treated water versus using municipal water
Since the operation in 2012, the plant
continues to deliver excellent results in
regards to effluent quality and flow (see
Table 2). All permit requirements are met and
virtually, all solids are removed. In addition,
the MBR effluent has an SDI < 3, which allows
for further tertiary treatment to treat colour
and odour by reverse osmosis, ozone, and
carbon filters.
The MICRODYN BIO-CEL ® -MCP MBR process
allows the tuna cannery to limit their
maintenance cleanings (MC) quarterly and
extended maintenance cleanings (EMC)
annually.
In fact, about 35 per cent of the tertiary
treated water (400 m 3 /day or 106,000 GPD)
is reused for the cooling towers, washing
docks/boats, bathrooms, cleaning the WWTP
and preparing chemicals for the WWTP.
STRONG RESULTS
By using the MICRODYN BIO-CEL ® -MCP
MBR process, the tuna cannery was able
to dramatically reduce biochemical oxygen
demand (98.8 per cent), chemical oxygen
demand (95.5 per cent), total nitrogen (96.8
per cent), total phosphorous (80 per cent)
and total suspended solids (97.7 per cent)
concentrations in its wastewater and feed a
tertiary treatment system.
After the tertiary system,
about 35 per cent of the
wastewater was reused in
other parts of the plant,
which saved the company
an estimated US$76,300
in water costs.
Ten MICRODYN BIO-CEL ®
400 membrane modules were
installed at the plant
This system allows the plant to meet the
environmental permit requirements while
utilizing lesser space as compared to
the conventional activated sludge waste
treatment plant. In fact, the MICRODYN
BIO-CEL ® -MCP MBR also allowed the plant to
reduce its annual chemical usage for system
cleaning too WWA
All images are credited to SSOZ.
From left to right: Raw effluent, DAF (dissolved air floatation) effluent, MBR permeate and tertiary effluent
Water & Wastewater Asia • September / October 2018