Process Description
Hydro-Flo
Continuous Flow
pH Adjustment Systems are designed to constantly
process flow rates up to a maximum of 2,000 GPM. As the water flows
through the system, chemicals for pH control (such as acid or caustic), and other required chemicals, are injected
automatically and continuously, based on flow rate and sensor outputs.
The treated water typically flows to another device for the
separation of precipitated contaminants
NOTE:
A pretreatment option is
available for the equalization tank. This option allows for coarse
treatment of the equalization tank contents.
The Equipment:
The basic system is
comprised of a single flat bottom reaction tank, a mixer, a series
of chemical metering pumps, a pH indicator/controller,
and a
control panel.
Skid:
A steel skid is provided for supporting the
entire system. The skid features a welded 4" steel "C" channel
frame and a 1/4" steel deck plate. The entire skid is blasted to an
SSPC-SP6, and coated with a 2 part self priming epoxy finish for
corrosion resistance. The skid color is OSHA Safety Blue,
unless otherwise specified.
Optional Containment Pan: As an
option, a containment / drip pan can be provided for protecting
the steel skid from leaking or spilled corrosive fluids. A drain
connection is provided for plumbing the containment pan to a
suitable location. The pan can be fabricated from polypropylene,
stainless steel, etc. and features 8" high walls.
The Reaction Tank:
There are many items to
consider when choosing the reaction tank. What is the
retention time required for proper pH adjustment (buffering)? What is
your average flow? What is your peak flow? What chemical processes are going to
be applied? Will the reaction be exothermic (create heat)?
If so, how much heat will be generated?
Hydro-Flo addresses all
of these items, as well as others, in order to properly size the
system and choose the correct materials of construction for the
application.
Reagent Storage Tanks:
Chemicals for treatment are pumped directly
from 55 gallon DOT drums. An alternate to pumping directly
from DOT drums is utilization of day tanks, which can be
automatically refilled from the customer's bulk chemical delivery system
within the plant. Redundant level sensors and redundant fill valves
provide protection against overfilling.
Valves:
All ball valves are true union, field
serviceable valves. All diaphragm valves are flange mounted. Elastomers are EPDM and Teflon except on concentrated acid lines
where the elastomers are Viton and/or Teflon.
Plumbing:
All recirculation, transfer and discharge
lines are fabricated from solvent welded, PVC SCH 80 pipe. All
reagent delivery lines are flexible PFA tube, double contained within
a clear flexible PVC hose, clamped at each end to seal leaks.
The Mixer:
The mixer is one of the
key elements of the system. The system will not generate
consistent results without a properly designed mixer. In a
typical continuous flow system, different mixers (size, speed,
etc.) handle different chemical reaction processes. In a
batch system, a single mixer must "change" to handle these different
processes.
Chemical Metering Pumps:
Properly sizing the
chemical metering pumps is important in order to achieve the correct
chemical reactions. Also, metering pump sizing has an impact
on total chemical consumption. Properly sized pumps will help
you reduce overall chemical costs.
Control Package:
All Hydro-Flo batch treatment systems are fully automated.
Control packages (depending on your specific requirements) are
available in either basic relay logic controls, or a full state of the art
PLC
with touch screen HMI and our
sophisticated treatment algorithms. The relay logic controls
package allows basic reconfiguration of the original system settings,
while the PLC based package allows maximum flexibility
to change the process parameters, as well as tight control that
minimizes chemical usage. We can include a variety of options
including digital data logging of critical
process parameters, ethernet access to process data, communication
with Building Management Systems, and even remote system access
using cellular wireless technology.
All enclosures are NEMA 4X. Where metallic
enclosures are used, they are provided with epoxy or polyester
finishes for corrosion resistance. All conduit is plastic coated,
where possible. Low voltage 24VDC is used throughout to minimize
service personnel exposure to high voltage. All panels are OSHA LOTO
and NFPA 79 compliant. UL-508 listing is available.
Effluent Monitoring: As mandated by
the local controlling authority, the effluent quality must be
continuously monitored. A two pen recorder is to be used to
monitor effluent flow rate and pH. The recorder is to be
equipped with a flow totalizer. Any effluent pH deviations will
trigger an alarm and system discharge will be halted.
System Packaging:
The system is supplied as a completely
fabricated "turnkey" package. All devices are pre-wired and plumbed.
You need to make the plumbing connections to
and from the system and a single electrical connection point for
incoming power. The disconnect on the MCP provides OSHA Lock
Out / Tag Out and NFPA 79 compliance. Systems requiring
compressed air, also require only one connection, and the valve is
supplied for OSHA LOTO.
Additional Information
For specific equipment information, contact us
directly. We can provide the specifying engineer with a formatted
specification package that thoroughly describes any of our systems
for bidding purposes. This includes detailed drawings, and detailed
equipment specifications.
The Hydro-Flo
continuous flow pH
adjustment systems are designed to regulate the pH of highly acidic
and highly alkaline process or wastewater streams, to a specific set point.
They are designed to constantly process flow rates up to a maximum
of 2,000 GPM.