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Dec 1, 2002 -
Dynatec Systems Inc. has completed the
startup and commissioning of a zero liquid discharge
recycle system in Brazil. The plant is operated by
an automobile parts manufacturer, Dura Automotive,
and produces approximately 100 m3 (approximately
26,500 US gallons) per day of waste water. The
discharge from the plant was previously treated
using conventional chemical/physical treatment to
remove heavy metals and oil prior to discharge.
The plant was informed by the environmental
authority that due to the sensitive nature of lakes
in the area that provide drinking water to the Sao
Paulo area, that they could no longer discharge
water from the facility to the local sewer plant.
The plant therefore had two options: first, they
could move the facility to an area where the
discharge restrictions did not exist, or they could
install a zero liquid discharge system.
After presentations by Dynatec, and their Brazilian
partner, Efluentes of Sao Paulo, the company
managers decided to go with the Dynatec zero liquid
discharge system.
The facility has a metal
finishing line, including various cleaning and
pretreatment stages, and including de-smut using
nitric acid, as well as chromate final rinse prior
to painting or finishing. After each treatment
stage, rinses are used which in fact provide the
bulk of the discharges from the finishing line.
Water from the various sources is pre-treated using
standard precipitation chemistry. For example Cr6 is
subjected to reduction, and other metals are
precipitated using standard chemistry. The resulting
stream is then treated using ultrafiltration to
remove residual solids and oils, and a two stage
reverse osmosis system, that provides over 90%
recovery of the water.
The water that is recycled
is over very high quality, in fact of a higher
quality than the incoming well water that is now
only used for makeup.
Finally, the residue from
the precipitation system is passed through a
dewatering stage, and solids are disposed of to a
local landfill. The filtrate from the dewatering
system, and the other concentrates from the
treatment system are then sent to an evaporator.
This is designed to handle fluids with very high
levels of dissolved solids without plugging.
The
efficiency of the plant design means that only
approximately 24 m3 per month (approximately 6,400
US gallons) of liquid waste has to be disposed of to
a waste treatment facility.
Contacts.
Dynatec Systems Inc.
909 Jacksonville Road
Burlington, NJ 08016
609-387-0330 voice
609-397-2060 fax
www.dynatecsystems.com |
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