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BIX-S
ION EXCHANGE SYSTEM
Remco Engineering BIX-S skid mounted ion exchange systems
are self contained units based on a fiberglass skid and fiberglass
mounting frame. These systems are designed for easy installation,
good appearance, and low maintenance. Modular in construction,
the systems are quickly modified if the need arises.
The system laid out in a lead/lag configuration with two or more
ion exchange columns, media prefilter and/or carbon filter. The
first ion exchange column fills with metal and is moved to the
regeneration/reclaim module. The second ion exchange column is
moved to where the first one was and is reattached to the system.
While the full column is being regenerated, the system runs on
one column only. When the regenerated column is returned, it is
placed in the lag (second) position. These systems are also used
with replaceable media when metal or pollutant level are low and
the system can run for month without breakthrough.
THE BASIC ION EXCHANGE SYSTEM: 
- Dual ion exchange columns with resin.
- Dual pumps, tefc motor
- 12" diameter, media (aluminum silicate) depth filter
- Diverter valve assembly
- Acid/Caustic dosing bottle
- Caustic and acid dosing pump
- pH controller
- Dual level controls, pump down and high alarm
- 150 gallon fiberglass tank
- Sample port between columns Operation
- Regeneration alarm
- Eductor for automatic effluent collection
The Basic Ion Exchange System is designed to remove metals from
dilute rinse water streams and concentrate them for recovery.
The system uses ion exchange resins to remove either cations (such
as Copper, Nickel, Chrome +3, Cadmium, Lead) or anions (Cyanide,
Chrome +6, Sulfate, Carbonate).
The rinse water is collected into the pH adjust tank at a rate
less than or equal to the capacity of the system (up to 10 gpm).
The rinse water is pH adjusted when necessary and pumped through
the resin columns. The system consists of dual TEFC motor driven
centrifugal pumps which recirculate the solution continuously
through an eductor which creates a vaccum entraining the rinse
water in the solution. A pH controller monitors the pH in the
recirculation tank and when the pH is correct and the level reaches
the set point, the solution is diverted to the columns.
As the solution passes through the column, the ions in the rinse
water are exchanged for the ions on the resin. In cation columns,
the exchange ions are usually H+ or Na+ (acid or Sodium) and in
anion columns the ions are OH- or Cl-(Hydroxyl or Chloride). A
simple example is removing Copper ions from a dilute waste stream
using a weak acid cation resin. The resin is prepared with Sodium
ions at the exchange sites. When the copper ions pass through
the resin, they are exchanged for sodium ions. The solution that
was Copper sulfate is now Sodium sulfate and the Copper ions remain
on the resin in the column.
The columns are in a lead-lag (series) configuration. The solution
passes through the lead column where most of the copper is removed
and passes through the second column where any residual copper
is removed. When the first column becomes saturated, "breakthrough"
occurs and higher copper levels are passed to the second column.
A sample valve is provided for checking for copper breakthrough
on the lead column. When copper breakthrough is detected, the
lead column is regenerated while the lag column becomes the lead
column and, temporarily, the only column.
Regeneration of a column is accomplished by washing the ion exchange
resin with a reverse flow of water to remove broken resin particles,
followed by an acid rinse to extract the copper from the resin.
The resin is next rewashed to remove the residual acid then conditioned
with caustic soda (NaOH) to return the resin to a sodium form
to prevent the pH of the rinse stream from dropping when the column
goes back on line. A final rinse removes the residual caustic
and reclassifies the resin. The column is now ready to go on line.
The Control System:
As the unit fills with rinse water, the pH probe located in the
sump senses the pH and the pH controller adjusts the pH. When
the pH is below the setpoint, the diverter valve is held in the
recycle mode while the pH is being adjusted. As the level in the
tank rises, it reaches the highest of the three level probes and
the level control switches to the pump down mode. The system will
pump down until the lower probe is reached. Upon reaching the
low level probe, the level control switches into the recycle mode
once again.
Bix-s Ion Exchange System Specifications
Operational range:
pH: ....................................................0-14
Flow rate: .............................................2 -10
gpm (based on column size)
Effluent quality:.......................................Divalent
cation leakage less than 0.5pp at design flowrate.
pH meter
Range: .................................................0-14
........................................................0.01 pH
........................................................0.1% mv
Accuracy................................................0.1% mv
Output
Relay ..................................................5 amps
@ 115
........................................................2.5 amps
Isolated 4-20 ma........................................Over input
span
Accuracy ............................................. 0.1% of
input
Pump, main
Power...................................................1.0 hp
max flow rate...........................................10 gpm
(through system)
Motor...................................................TEFC
Phase...................................................Single
Material................................................Noryl
Pump, dosing (solenoid)
Duty cycle, max.........................................100%
Output..................................................30 gallon/day
Power...................................................200 watts
Main holding tank.......................................Approximately
150 gal
Dosing bottle...........................................5.0 gallons
Columns.................................................2.0-5.0
cu. ft.(27.5")
Ion Exchange Resins
Carboxylic (weak acid cation.....................8 lb/cu ft copper,7
lb/cu.ft Ni
Sulfate (strong acid cation).....................3.5 lb/cu.ft
copper,3.0 lb/cu.ft Ni.
Chelating(iminodiacetic).........................2.0 lb/cu.ft
copper,1.8 lb/cu.ft Ni.
Power Requirements:......................................115 volts,
5 amps
.........................................................230 volts,
10 amps
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