TL-164

Figure 1. Exploded view of the Vanton

pedestal mounted FLEX-I-LINER® pump

showing basic simplicity of construction.

Converting Peroxide Waste

into Profitable Sewage

Disinfectant

INDUSTRY:

ENTITY:

SOLUTION(S) PUMPED:

PUMP TYPE(S):

Pharmaceutical

Foremost Machine Builders, Inc.

Hydrogen peroxide

FLEX-I-LINER Sealless Self-Priming Peristaltic Pumps

 

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Reprinted from PROCESSING

By Anthony Lawson, Director of Engineering, Foremost Machine Builders, Inc.

 

Creative processing system converts hazardous

peroxide waste into profitable sewage disinfectant

 

A large international supplier of medical devices approached Foremost

Machine Builders, Inc., of New Jersey with a serious problem: How to

extract a 50 percent solution of hydrogen peroxide from used and

unused pre-packaged caplets. The hydrogen peroxide caplets were

used in their line of medical device sterilization equipment, but some of

the caplets were never used, and even those that were used contained

hazardous residue that required special handling with high waste

disposal costs.

 

Despite being recognized as a creative developer of customized process

equipment systems, this request presented multiple challenges

involved with handling a dangerous and toxic active oxidizing agent that

can burn those in contact with it before they become aware of the

danger. The system created had to accomplish the following:

 

• Gather and convey bulk amounts of the caplets from storage to a

granulator,

• Break open the caplets and reduce the plastic to small flakes,

• Separate the liquid from the solids and transfer both the fluid and the

flakes to separate holding tanks,

• Transfer the hazardous liquid from the system holding tank to a

portable container.

 

This is a true resource recycle application. Knowing hydrogen

peroxide's germ and bacterial killing abilities, and troubled by the high

cost of hazardous waste disposal, they realized that recovery of the

hydrogen peroxide could result in a saleable product for use by

municipalities for sewer sanitation treatment.

 

Design considerations included personnel safety since no contact with

the solution was permissible and special care in material selection was

required to ensure inertness to the corrosive chemical. The key

components of the system designed to convert hazardous waste into a

useful product includes:

 

1. An in-feed conveyor to gather bulk quantities of caplets and convey

them to a Foremost Granulator.

2. A granulator to break open the plastic caplets and reduce them to

small flakes.

3. A solid/liquid separator to direct the hydrogen peroxide liquid to a

designated filter/holding tank, and the plastic flake to a solid waste

container for disposal.

4. A discharge pump station to transfer the hydrogen peroxide from the

filter/holding tank to a portable container.

 

One of the most critical decisions involved in selection of the liquid

handling pump for which the following specifications had to be met:

 

1. The pump must be sealless to avoid leakage into the atmosphere or

onto the floor.

2. Self-priming was essential because of the stop-and-run intermittent

operation. In addition, the pump had to have run-dry capability to avoid

severe damage to the pump or motor in case of extended fluid

stoppage.

3. All fluid contact components were to be inert to hydrogen peroxide at

various concentrations.

4. Dependable operation had to be ensured under conditions of

intermittent service emptying 45 gal (170 L) drums at 7 gpm (26.5 lpm).

 

After reviewing a wide variety of chemically inert pumps that might be

suitable for these difficult service conditions, Foremost system

designers selected a thermoplastic, sealless, self-priming rotary

peristaltic type design. Key to its selection was the fact that only two

pump components, the pump body and an elastomeric replaceable

liner, were in contact with the fluid (Figure 1). Both of these

components were available in a wide selection of non-metallic materials

(Figure 2) with a history of successful service in corrosive and other

aggressive environments.

 

Pump specifications called for a portable close-coupled, single-cavity,

flexible liner pump driven by a ½ horsepower (.37 Kw) , single-phase,

60 Hz, 1,800 rpm TEFC motor. The fluid path and proprietary design of

this pump isolates the chemical to the channel formed by the outside

surface of the flexible liner and the inside wall of the pump body. The

pump features linear replacement, which requires no special tools and

can be accomplished in a manner of minutes at the job site.

 

The decision was made to specify the heavy-sectioned pump body in

virgin, homogenous Teflon, and the rugged, flexible liner in the

fluoroelastomer Viton. These two DuPont fluoropolymer materials

provide the required chemical resistance to the corrosive, hazardous

hydrogen peroxide solution. Of equal significance was the assurance

against leakage provided by the unique design of these pumps. Any

leakage that might occur in the unlikely event of liner failure would tend

to be inside the pump and present no danger to plant personnel. The

result of such internal leakage would be a reduction in flow, but there

would be little danger of leakage or drippage onto the floor.

 

 

 

Figure 2. FLEX-I-LINER® pumps are

available in a variety of engineered

rigid plastics and elastomers enabling

them to safely handle just about every

corrosive or hazardous fluid over the

full pH range.

Copyright 2016 - Vanton Pumps (Europe) Ltd - All rights reserved

About Us

In the 1950, Vanton developed a revolutionary all-plastic pump for use in conjunction with the first heart-lung device. The design limited fluid contact to only two non-metallic parts: a plastic body block and a flexible liner. This was the birth of our Flex-I-Liner rotary pump. Its self-priming sealless design made it an industry standard for the handling of corrosive, abrasive and viscous fluids as well as those that must be transferred without contaminating the product. Vanton now offers the most comprehensive line of thermoplastic pumps in the industry.

 

 

Stay in touch

mail@vantonpump.com

(+44) 01260 277040

Vanton Pumps (Europe) Ltd.

Unit 4, Royle Park

Royle Street

Congleton CW12 1JJ

UNITED KINGDOM

www.vantonpump.com