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Heavy Metal Removal in Wastewater
Treatment
Filtration Solutions, Inc.
FSI provides a complete system for the
removal of heavy metals in most industrial wastewaters.
The system combines the conventional
chemical treatment with modern tubular membrane technology to provide the most
cost-effective solution.
It consists of three major components,
1) a chemical reaction unit,
2) a micro filtration unit, and
3) a dewatering unit.
Auxiliary components, such as pumps and
tanks complete the system.
The chemical reaction unit adjusts pH
levels of the wastewater to precipitate any dissolved metals into suspended
solids.
The effluent is then fed into a micro
filtration unit, WTS, which is the heart of the system, and can process
wastewater to meet local discharge requirements or be recycled for reuse.
The typical achievable level for some
common heavy metals are shown in Table 1.
Limits for the RCRA 8, a group of eight
heavy metals that are extremely toxic at even small concentrations and are
required to be monitored under the Resource Recovery and Conservation Act, are
shown in Table 2. The concentrate from the WTS is then sent to the dewatering
unit for final processing.
The process details are shown below.
FSI can provide a pilot testing to ensure a proper system design and confirm the
effluent quality.
Treatment Processes:
2) The water is then
fed to reaction tank #2 where additional chemicals and coagulant (such as
organic polymers, ferric chloride) are added to control pH and further enhance
precipitation and the formation of solids.
3) The water is then sent to a concentration tank to be
treated by a tubular membrane filtration system, in which the permeate from the
TMF is discharged or further processed treated for plant reuse and the
concentrate is recycled back to the concentration tank.
4) Solids level in the tank are usually maintained at 3-5%
and the settled sludge is periodically removed to a sludge tank.
5) The accumulated sludge is sent to a filter press for
de-wetting and then disposed. The excess water from the press is piped back to
the concentration tank.
About
FSI
We are
concerned that your problem is properly investigated before we consider a
solution and we will make certain our offer is a best fit for your needs. We
will work with you to understand your objectives, constraints and any unique
requirements that must be satisfied. We will ask specific questions about the
conditions of your application. If necessary, we will suggest laboratory sample
testing, demo or pilot testing
to clarify the problem(s), as well as characterize the unit selection or system
customization. Our offer will be efficient, cost effective and a best match for
your conditions, whether it is one of our standard filtration units or a
customized system. If another technology is the right choice for you to
consider, we will fully inform you.
Our
engineers bring a diversity of technology experience to each problem. Solutions
are tailored to our clients’ needs. Membrane selection is critical for
performance efficiency and durability. The right pre-treatment, materials of
construction and proper handling, installation, ease of operation and
maintenance are all considered.
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