LO/PRO ® PACKAGED ODOR CONTROL SYSTEM

Municipal and industrial water and wastewater treatment plants supply our growing communities with a vital resource: clean water. In the process of treating our water, some processes generate odorous gases such as hydrogen sulfide, ammonia, or organic compounds. As a good neighbor, often in close proximity to the general public, these facilities must contain and neutralize any odors created. A preferred solution is wet chemical scrubbing. A wet scrubber mixes odorous gases with a stream of liquid chemicals that react with and neutralize the offensive compounds. RJ Environmental Products offers a complete line of wet scrubber odor control systems. By far our most popular, versatile and effective product is the LO/PRO® Packaged Odor Control System. Since its introduction in 1994, the LO/PRO has become the industry leader. It is the result of more than 20 years of experience developing, designing, building and testing wet scrubber systems. To date there are more than 100 LO/PRO scrubber systems in operation worldwide. USFilter sets the standard for odor control technology. Our experience, reputation and product line are unequalled in the industry.

THE LO/PRO ® ODOR CONTROL SYSTEM

SUPERIOR TECHNOLOGY

The LO/PRO® Odor Control

teed, with removal efficiencies in excess

System is the most technically

of 99.0% and air flow rates up to

advanced and cost-effective scrubber

24,500 cfm.

system available. The LO/PRO is

Each system is completely factory

a patented[1], multi-stage, multi-

pre-assembled and mechanically tested

chemistry wet scrubber system which

prior to shipment. Premium vinylester

can be configured to remove hydrogen

fiberglass reinforced plastic (FRP)

sulfide, ammonia, or organic odors

construction provides superior strength

from municipal and industrial process

and corrosion resistance. The compact

gases.

design occupies a fraction of the space

Each installation is custom-

required by conventional packed tower

designed to maximize efficiency and

systems, with better chemical utiliza-

minimize chemical consumption, in

tion and lower installation and mainte-

coordination with other customer

nance costs.

requirements. Performance is guaran• PATENTED PROCESS

• VERSATILE DESIGN

• LOW PROFILE/ COMPACT SIZE

• SINGLE SOURCE RESPONSIBILITY

• GUARANTEED PERFORMANCE

• FACTORY ASSEMBLED

• EASY INSTALLATION

[1] LO/PRO® systems are covered under patent no. 5,876,662. USFilter has a Notice of Allowance of claims in a second U.S. patent application.

THE LO/PRO ® PROCESS

H2S REMOVAL PROCESS CONFIGURATION

The schematic diagram below illus-

The gas then passes through Stages 2

trates a typical LO/PRO configuration

and 3, where a strong oxidization reac-

for hydrogen sulfide (H2S) removal. In

tion removes all remaining H2S.

Stage 1, the process gas is pre-treated

Chemical utilization is optimized

with blowdown from Stage 2/3 as well

through precise control of pH and

as with fresh caustic solution to remove

ORP levels in the scrubber liquid.

70-80% of the incoming H2S. VENT

MIST ELIMINATOR

RECIRCULATION PUMP NaOH STORAGE

NaOCI STORAGE

STAGE 3

STAGE 2

STAGE 1

ODOR REMOVAL

ODOR REMOVAL

PRETREATMENT

RECIRCULATION PUMP

OVERFLOW

SUMP

SUMP

NaOH/NaOCI

NaOH

DRAIN

ORP

pH

LS

LS

pH

FOUL AIR EXHAUST FAN

METERING PUMPS MAKE-UP WATER IN

BLOWDOWN (DRAIN & OVERFLOW)

COMBINED H2S AND NH3 REMOVAL

LO/PRO systems have been designed for removal of hydrogen chloride, hydrogen fluoride, and other acid gases. Systems can also be configured to remove ammonia and hydrogen sulfide in the same scrubber. In this process, the first stage is maintained at a low pH, and a strongly acidic solution removes more than 99% of the ammonia. In the second and third stages, sodium hydroxide (caustic) and sodium hypochlorite (bleach) in the solution remove more than 99% of the hydrogen sulfide.

CUSTOM DESIGNS

The system chemistry can be configured to remove mercaptans and other odorous organic compounds that cannot be controlled effectively with a conventional caustic and bleach scrubber. We have also designed unique odor control systems that operate at high pressure or high vacuum, systems that treat gases containing up to 50% carbon dioxide and/or methane, and systems that treat concentrations in excess of 60,000 ppm H2S.

THE LO/PRO ® DESIGN INFORMATION

EXHAUST STACK

MULTI-STAGE SCRUBBER VESSEL

S

RECIRCULATION PUMP

ALTERNATE EXHAUST FAN INLET ON BACK

H

EXHAUST FAN

CHEMICAL METERING PUMPS

CONCRETE PAD pH & ORP PROBES

L

OVERFLOW & DRAIN SUMP ACCESS PORT, TYP.

W OAL

LO/PRO® DESIGN INFORMATION

Model

Air Flow Rate (cfm)

LP-1500 LP-1750 LP-2000 LP-2250 LP-2500 LP-2750 LP-3000 LP-3500 LP-4000 LP-4500 LP-5000 LP-5500 LP-6000 LP-6500 LP-7000

1,000 1,300 1,700 2,200 2,700 3,300 4,000 5,500 7,100 9,100 11,200 13,600 16,200 20,000 24,500

Scrubber Dimensions Overall LxWxH Length (ft.) [OAL](ft.) 4.5 x 4.0 x 8.5 5.25 x 4.25 x 9.25 6.00 x 4.5 x 9.25 6.75 x 4.75 x 9.25 7.50 x 5.0 x 9.5 8.25 x 5.25 x 9.5 9.0 x 5.5 x 10.50 8.75 x 6.0 x 11.0 10.0 x 6.5 x 11.0 11.25 x 7.0 x 11.25 12.5 x 7.5 x 11.5 13.75 x 8.0 x 11.75 15.0 x 8.5 x 12.0 16.25 x 9.0 x 12.25 17.50 x 9.5 x 12.5

9.00 10.00 11.00 12.50 13.00 15.00 15.50 16.00 17.50 19.50 20.50 22.00 24.00 26.00 27.00

[S] - stack height [minimum 5 ft.] [1] - Fan HP based on 2 in. water column inlet duct loss.

Shipping Weight (lbs) 1,000 1,600 2,200 2,500 3,100 3,700 4,400 5,000 5,600 6,200 6,800 7,500 8,300 9,100 10,000

Operating Weight (lbs) 3,500 4,500 6,000 7,000 8,000 9,500 11,000 12,000 14,500 17,000 19,500 22,000 25,500 28,500 32,000

Fan [1] Motor (HP) 5.0 5.0 7.5 7.5 7.5 7.5 10.0 15.0 15.0 20.0 25.0 30.0 40.0 50.0 60.0

Recirc. Pump Stage 1 Motor (HP)

Recirc. Pump Stage 2/3 Motor (HP)

1.5 2.0 2.0 3.0 3.0 5.0 5.0 5.0 5.0 5.0 7.5 7.5 7.5 10.0 10.0

2.0 3.0 5.0 5.0 5.0 5.0 5.0 5.0 7.5 7.5 7.5 10.0 10.0 15.0 20.0

LO/PRO ® PROVEN PERFORMANCE

Los Angeles, CA Application

Hyperion WWTP Influent Headworks

Air Flow Rate (cfm)

20,000

Chemicals

NaOH, NaOCl and H2SO4

Design Efficiency

99.0%

Dimensions L x W x H (ft.)

16.0 x 9.0 x 12.0

Performance

Average

Peak

Inlet H2S (ppm)

41

113

Outlet H2S (ppm)

0.11

0.24

Removal Efficiency

99.73%

99.79%

Half Moon Bay, CA Application

WWTP, Odor Control Facility

Air Flow Rate (cfm)

10,000

Chemicals

NaOH and NaOCl

Design Efficiency

99.0%

Dimensions L x W x H (ft.)

12.5 x 7.5 x 12.0

Performance

Average

Peak

Inlet H2S (ppm)

25

101

Outlet H2S (ppm)

0.01

0.26

Removal Efficiency

99.96%

99.74%

Avon, CO Application

Avon WWTP, ATAD Process

Air Flow Rate (cfm)

3,000

Chemicals

NaOH, NaOCl and H2SO4

Design Efficiency

99.0%

Dimensions L x W x H (ft.)

11.0 x 5.5 x 10.0

Performance

H 2S

Mercaptans

Inlet H2S (ppm)

8.0

6.0

Outlet H2S (ppm)

0.02

ND

Removal Efficiency

99.75%

>99.0%

OTHER ODOR CONTROL APPLICATIONS

Samsung Corp., Tijuana, Mexico Application

Acid Gas Scrubbers (3)

Air Flow Rate (cfm)

10,600 to 21,200

Chemical

NaOH

Design Efficiency

99.9%

Dimensions L x W x H (ft.)

13.5 x 8.0 x 13.0

Performance

HCI

HF

Inlet (ppm)

350

350

Outlet (ppm)