Which Positive Displacement Pump Is Best For Wastewater ...

Author: Ruby

Aug. 26, 2024

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Which Positive Displacement Pump Is Best For Wastewater ...

Sometimes, years after the design of a municipal wastewater treatment system, the needs of the plant change and opportunity for better efficiency is born. That's what happened at a wastewater treatment facility in northwestern Wisconsin.

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The facility had a centrifugal pump used for both transferring sludge from a tank to a thickener, and loading trucks. They no longer needed the pump to assist with load out. Transferring the sludge to a tank didn't require such a high flow rate, or such a large pump. Operators knew reducing the pump and motor size could mean hundreds of dollars per year in energy savings. They talked to Travis Walker, their Crane Engineering account manager, to investigate options.

There are 4 different pump options Walker would recommend for sludge transfer. Each of them have their own pros and cons:

Centrifugal

Centrifugal pumps are good for low viscosity sludge with very little solids. This type of pump will generate far less pulsation than the positive displacement pumps that make up the remainder of this list.

Centrifugal pumps do have a high shear rate, unfortunately. As you probably know, imparting shear on sludge is counterproductive. When treating sludge, wastewater facilities want to keep the sludge highly concentrated. When sheared, more surface area is created, dispersing the solids, making it harder to dewater.

AOD

The air-operated diaphragm is a popular option for sludge. The simplicity of this pump is one reason why.

It has a single diaphragm powered by compressed air. It is very simple to control the speed of the pump, and it has a predictable fluid displacement result. Check out the video below to see how an AOD pump operates.

The AOD pump is good for producing a consistent sludge blanket for more consistent percent solids sludge.

Air operated diaphragm pumps have high pulsation rates, however. As stated before, they use compressed air to operate. If a large air compressor doesn't already exist at the facility, it's more expensive to operate this pump. If compressed air is already available, this type of pump becomes more workable.

Progressive Cavity

Progressive cavity pumps are great for sludge. They impart little to no shear on the sludge, and generate low pulsation rates.

As great as they are in application, maintenance and repair are big issues. Ask anyone who has ever repaired one! Some progressive cavity pump manufacturers have realized this and created new pump designs that make servicing easier. Check out the Moyno EZ Strip for example.

These pumps also take up a large footprint. When replacing a centrifugal pump (or other type) with a progressive cavity pump, expect to retrofit some piping.

Rotary Lobe

Rotary lobe pumps are great for high viscosity fluids. Like the progressive cavity, there is low shear and low pulsation. They have a small footprint and easy to access the wetted parts through the cover plate in front of the pump.

This type of pump is more expensive upfront, but over time, the amount spent on parts, maintenance, and repair time is far less than a progressive cavity pump.

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At the wastewater treatment facility in northwestern Wisconsin, the rotary lobe pump was the clear winner. Because of its' footprint, the pump would fit the piping layout and require the least amount of retrofit to the system.

There are definitely a lot of options when it comes to pumping wastewater sludge. The right choice comes down to where the sludge is in the treatment process, the amount of footprint available, availability of air at the facility, and budget.

Need help selecting the right positive displacement pump for your sludge treatment? Ask us about it! We gladly provide technical assistance to businesses and municipalities in Wisconsin and upper Michigan.

Sludge Pumps

Many pumping applications require reliable equipment to pump various types of abrasive, dense or highly viscous substances, including sludge, slurry, muck, or certain solid materials. In these cases, sludge pumps can help prevent clogging and maintain the efficiency of your pumping processes. To meet the needs of a wide variety of applications, GATOR Pump, Inc. is here to provide you with the right and most cost effective solution.

The GATOR Sludge Pump offers many benefits and ensures consistently efficient processes for a variety of applications. Our unique slurry valve uses the pump discharge flow to agitate and slurry the sludge to &#;thin&#; the fluid for pumping and handling. After the slurry process is complete, the valve is closed to pump the sludge material to the discharge point.

Sludge Pump Uses & Applications

Otherwise known as slurry transfer pumps, sludge pumps are used for transferring heavy and viscous liquid materials with high solid content. To help break down solids into smaller more easily transferable materials, a sludge removal pump often includes a chopper impeller. A high-quality sludge pump is capable of efficiently removing and transferring many thicker fluids with ease to prevent clogging at any point while pumping. Some of the materials that sludge pumps can transfer include sewage, bio waste, mud pits, oil sludge, food pulp, and manure slurry.

Sludge pumps are used for many pit dewatering applications in the mining, industrial, agricultural, and construction industries, which often require the regular removal of waste products. Other types of pumps won&#;t be able to transfer liquids with high solid content, potentially resulting in clogging and backup that leads to system failure and costly downtime.

Sludge Pump Advantages & Benefits

There are several key benefits of using sludge pumps, including:

Low Energy Consumption. Portable sludge pumps feature efficient designs and reduced power consumption compared to other pump systems. As a result, you can save more money on energy costs with a more sustainable solution for waste removal. Low Energy Consumption. Portable sludge pumps feature efficient designs and reduced power consumption compared to other pump systems. As a result, you can save more money on energy costs with a more sustainable solution for waste removal.
High Abrasion Resistance. Sludge pumps are designed to handle abrasive solid materials, unlike other liquid pumping systems, making them more likely to hold up to abrasion. With less vulnerability to abrasion, you can avoid the need for frequent maintenance checks, downtime for repairs and replacements for parts.
High Wear Resistance. Since sludge pumps frequently transfer liquids containing solid content such as sand and gravel, they are constructed from high-quality materials to protect parts from wear. Less wear means further reduced maintenance and replacements, helping you get the most from each system.
Long Working Life/Durability. Due to their quality of design and construction, sludge and slurry pumps are built to last for many years of use.

How to Choose the Best Sludge Pump

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Choosing the proper sludge pump largely depends on your application. Factors such as pump design, construction material, pump deployment, power requirements, and amount of solid content in the sludge are all important to consider when selecting a sludge pump for your project.

It is also crucial to work with a reputable sludge pump provider. Doing so grants you access to expert assistance in pump selection so that you can feel confident in your choice. At GATOR Pump, we can work with you to provide a high-quality, efficient, and reliable sludge pump that meets the specifications and requirements of your application.

Sludge Pumps from GATOR Pump

When searching for the right sludge pumps for any application, GATOR Sludge Pumps can give you the reliability and efficiency you need. Our pump experts can also offer customization assistance; we can accommodate a wide array of unique requests and modifications.

To learn more about our GATOR Sludge Pumps, request a quote or contact us today for more information.

Contact us to discuss your requirements of Marine Dredging Pump manufacturer. Our experienced sales team can help you identify the options that best suit your needs.

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How Does centrifugal pump for mining Work?

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