Electric Diaphragm Pump Case Study for Wastewater Treatment Dewatering

Electric Diaphragm Pump Case Study for Wastewater Treatment Dewatering

ARO 2″ stainless steel EVO Series™ pump offers maximum energy efficiency in wastewater metering application


The EVO Series™ Electric Diaphragm Pump was placed in a manufacturing facility producing chemicals and other equipment for the commercial cleaning industry.

Products being manufactured at the facility include: dish washing detergent, hand cleaners, sanitizers, disinfectants, floor cleaners, strippers, finishers, sealers for stone, tile, and grout, degreasers, glass cleaners, laundry detergents and other chemicals and equipment.



The Application


The large commercial cleaning product manufacturer required the following features in their wastewater discharge pump:

The ability to maintain consistent flow rates at varying head pressures
Constant operation at multiple speeds
Precise metering of wastewater into the municipal sewer system
The ability to quickly increase flow to discharge a large volume of wastewater based on system requirements

The EVO Series™ Electric Diaphragm Pump was installed to push a precise amount of wastewater through a filtration system with varying pressures. The pump discharges the exact amount of treated wastewater based on the allowable flow rate dictated by the municipality. The pump provides “sprint” capability to discharge large amounts of wastewater if it is required by the treatment process.

Operating Conditions

Running Hours: 1,600

Average Speed: 40 pump rpm/4.2 rad/s (17 Hz)

Average Torque: 10% achieving average, 26% max peak

Current Flow: average 3.6 amps, achieving max 5.4 amps

Average Pressure: 16.9 psi (1.1 bar)

Average Flow Rate: 30 gpm (113.6 l/min)



The Results


Specifications of the pump installed:

2” EVO Series™ Electric Diaphragm Pump with Stainless Steel pump head, PTFE Diaphragm and Balls

The customer highlighted the following benefits noted after four months of operation:

Low pulsation results in significant output efficiency
Ability to perform consistently at different speeds to be able to maximize the customer’s output requirements
Significant noise reduction
Pump has not required any maintenance, thus reducing costs and resources

The EVO Series™ Electric Diaphragm Pump saved the customer money by maximizing energy efficiency and minimizing maintenance costs.


The EVO Series™ Electric Diaphragm Pump offers an exclusive set of proven technologies packaged into one breakthrough pump.

  • Top pump efficiency
  • Low pulsation
  • One of the best solution for dosing applications
  • High efficiency for companies that use activated carbon in WWT applications
  • Suspended solids capability



ARO EVO Series™ Electric Diaphragm Pump for the Starch Glue Industry

ARO EVO Series™ Electric Diaphragm Pump for the Starch Glue Industry

Choose a top efficiency pump for heavy-duty application

Cardboard manufacturing is a high energy-consuming industry, due to the large volumes required and the characteristic of the raw material used, some manufactures are forced to work 24/7 at a heavy duty industrial rate.
Starch glue feeding and recirculating line is one of those rigorous manufacturing processes. Starch Glue is used to bond different paper layers in the corrugated cardboard production, the quality of glue is crucial for producing high quality cardboard.

pump for starch glue

Starch glue has to flow continuously to avoid filming, it is highly sensitive to overheating and high shear. For those reasons, diaphragm pumps have always been the “pump of choice” for this application. However, with energy prices increasing and the environmental impact  of energy usage itself, more focus has been directed towards reducing energy processing costs. Air production in manufacturing plants is one of if not the most expensive energies to use in production.

In these particular success stories, customers were intrigued about an electric style pump for their particular applications and the EVO Series Electric Diaphragm was the perfect answer!

Customer Type

Both of these stories come from large companies producing corrugated cardboard all the way to producing cardboard boxes for various industries. They produce boxes by starting from paper rolls and producing their own corrugated cardboard. Both customers have multiple corrugating machines running simultaneously at variable duty according to production needs.

The Application

Customer 1: Two different types of starch glue,
single-faced and double-faced layers, both lines are feeding simultaneously 3 corrugating machines that run at different duties according to production needs.
Customer 2: One type of starch glue is used to feed 4 corrugating machines running simultaneously at different load according to production needs
Both customers where looking for an electric solution

Both customers where looking for an electric solution able to meet the following criteria:

• High efficiency to reduce energy consumption
• Handle variable viscous fluids, Starch glue viscosity could vary between 1500 and 3000 cPs
• Gentle pumping, to avoid damaging the quality of the glue and consequently damage to the finished product
• Self-regulating, to adapt to demand variation
• Pump to be easily integrated in the system for remote monitoring and control.
• Easy maintenance, to avoid long downtime and production loss

The Solution

Technical Observations

In addition to the advantages already described, customers experienced:
• Low noise operations: reduced noise compared to other positive displacement pumps
• Smoother flowrate to corrugating machines: thanks to its special three chamber design and precise torque
control, the pump is able to provide a consistant flowrate with little pulsation
• Incredible reduction of energy consumption: after a few weeks of operation, one of the customers calculated
their ROI of less than 14 months

Customer’s Testimonial

“When we installed the pump, we tested it by simulating a sudden increase of required flowrate at corrugating machines and we have been impressed on how the pumps react promptly without any loss of flowrate….the pumps are perfectly self regulating. There is no longer a need to change the pump set up when moving from full production load to recirculating load!

Glue Kitchen Manager at Customer 1

“Moving to to the EVO Series pump was a wonderful choice! One pump can actually do the job that two pumps were doing in the past! This allows us to run only one pump at a time, while having a stand-by pump ready to run if needed!

With EVO Series™, we are not only reducing our energy consumption but also increase our productivity rate by reducing at minimum our downtime and increasing maintenance intervals!

Maintenance Manager at Customer 2


ARO Solutions for Cosmetics & Pharmaceuticals

ARO Solutions for Cosmetics & Pharmaceuticals

The safety and quality of cosmetic and pharmaceutical products is as important to us as it is to you. That’s why ARO engineers design our fluid handling equipment and powder pumps to meet stringent industry requirements for safety and sanitation.

Our sanitary diaphragm pumps are known worldwide for reliability and for leading the industry in total cost of ownership.

Our full range of sanitary pumps and packages are expertly designed for a variety of applications:

  • Personal care products such as lotions, hand sanitizers, shampoos and shower gels
  • Cosmetics
  • Active pharmaceutical agents
  • Food and beverage
  • Wine and brewing
  • Wastewater transfer
Automatic Dewatering System by ARO Fluid Management

Automatic Dewatering System by ARO Fluid Management

Air Operated Control Solution with Liquid Level Sensing

ARO Dewatering System on siteARO Dewatering System

The ARO® Automatic Dewatering System offers automatic on/off controls for Pro and EXP diaphragm pumps.  A pneumatically controlled Liquid Level Sensor is used to easily control the fluid level within a desired range.  The Automatic Dewatering System will limit the monitoring labor and reduce air consumption by avoiding dry running of the pump.


  • Simple design is easy to setup and use
  • All pneumatic operation eliminates electrical ignition source
  • High/Low level control maintains fluid between established levels
  • Reduces air consumption by avoiding pump dry running
  • Portable system with directly mounted liquid level sensor

Working principle of ARO Dewatering System

Pump Compatibility

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Complete the following form, so we can help you with the best solution for your application. We’re at your service.

EVO Series™ Electric Diaphragm Pump by ARO Fluid Management

EVO Series™ Electric Diaphragm Pump by ARO Fluid Management

It’s time to EVOlve your expectations of what a pump can do for you. The ARO EVO Series™ Electric Diaphragm Pump offers an exclusive set of proven technologies packaged into one breakthrough pump.

The all-electric diaphragm pump is changing the game in diaphragm pumping. First, it’s not a double diaphragm, rather it’s a tri-chambered diaphragm pump, and it uses a crankshaft-like piston method which is electric motor driven.  It is a positive displacement pump like no other and it can handle anything that an air operated diaphragm pump can but even more efficiently.  It can handle sludge, slurries, pastes, or anything that an air operated diaphragm pump can pump, but without the hassle of the usual drawbacks of needing air.

ARO Electric Diaphragm Pump

  • Integrated encoder
  • No maintenance gearbox
  • Sealless design – no dynamic seals that could allow hazardous fluids to enter the environment
  • Unique 3 chamber design
  • Innovative diaphragm developed exclusively for the EVO Series™ Electric Diaphragm Pump
  • Choice of 5 different materials of construction to handle the most aggressive and corrosive fluids. Select from stainless steel, cast iron, aluminum, polypropylene or conductive polypropylene.
  • Built-in control and monitoring capability
  • Can be controlled with a PLC
  • Built-in motor thermal protection
  • Extended maintenance cycle and smart maintenance schedule
  • Synthetic oil and filtration system for reliable performance over a wide range of temperatures
  • ARO exclusive AC gear motor available in standard (black) safety area version or hazardous duty (red) version

The unique EVO Series™ Electric Diaphragm Pump design provides the confidence to keep your people safe, your processes running and your operating costs down. ARO engineers put the pump through over 20,000 hours of relentless testing at full load conditions with a variety of fluids. The most grueling conditions were replicated in testing and trials to make sure these electric pumps would perform up to your highest expectations. The EVO Series™ pump delivers a flexible solution that can work in a wide variety of applications among the toughest conditions and requirements.

Complete the following form, so we can help you with the best solution for your application. We’re at your service.

New ARO® 2″ Center Ported Polypropylene EXP Series AODD Pumps

New ARO® 2″ Center Ported Polypropylene EXP Series AODD Pumps

ARO 2" Non-Metallic Models

ARO 2″ Non-Metallic Models

ARO 2″ PW Series

ARO® expands EXP Series with new 2″ Center Ported Polypropylene Models. The standard model PD20P-YXS-XXX has 2″ ANSI/DIN Hybrid center ports facing the air inlet side of the pump (see picture). The PW20P-YPS-XXX models have the top manifold rotated 180 degrees. In the PW configuration, the ARO® pump matches the fluid inlet/outlet port dimension of Wilden® P800 and PS800 and Versa-Matic® U2 pump series. In addition, the mounting feet location of both PD and PW models matches the Wilden® P800 and PS800 models. ARO® has the lowest total cost of ownership over the competition. Our pump trial program and the parts Trade In & Trade Up program is available for competitive conversions. Contact your district sales person for more information regarding these programs. If a model is not active at the time of the order, then contact your district sales person for the special price reference number for the Diaphragm-Series order.