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How are decanter centrifuges used in municipal wastewater plants?

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Wastewater treatment processes using decanter centrifuges can range from primary to tertiary treatments with varying degrees of processing and solids removal required, dependent upon the individual characteristics of each particular wastewater system.

The principal application is for high-solids anaerobic digesters using a decanter centrifuge to process sludge wastewater.

Single-stage decanter centrifuges are used to separate the solids from the wastewater before they are discharged into sewer lines. Centrifuges can also be used for primary and secondary sludge dewatering at treatment plants.

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The role of decanter centrifuges in municipal wastewater treatment plants

For wastewater treatment plants of all sizes, the final step before sludge leaves for disposal is a critical one that accounts for an important share in total operating costs. Equipment must reliably produce stable dewatered sludge while minimizing downtime and maintenance requirements - which makes this phase essential to overall success.

Medium to large plants will also include a digestion treatment step using either standard aerobic, anaerobic, or more advanced methods such as pre-hydrolysis sludge treatments. In each of these cases, the performance of the digester is directly linked with that of thickening equipment and its effectiveness in improving the solid's suspension time. Decanter centrifuges are designed to ensure that both thickening and digestion are extremely reliable, flexible, and easily automated.

In order to optimize the production efficiency, it's important not only to have all necessary components, but they must be functioning at peak capacity so when combined both phases can work seamlessly together.

The wastewater treatment process

Solid materials are first concentrated by sedimentation in primary clarifiers before being dewatered by decanter centrifuges.

Sludge from wastewater treatment systems is often concentrated and dewatered to reduce the volume of material that needs to be processed for disposal or recycling. The resulting "cake" can be stored in a silo for future use as a soil amendment or sent directly to drying beds before being loaded for disposal.

Generally, wastewater treatment sludge is pumped from primary clarifiers to the centrifuge by means of a screw pump or an air-driven centrifugal feed pump that either contains or operates in conjunction with a gear system. Single-stage centrifuges are used to separate the solids from the wastewater before they are discharged into sewer lines.

Typically, wastewater treatment plants use feed pumps to supply sludge to drying units, where the sludge is dewatered, and dried by an air-driven rotary drum dryer before being fed into the screw press or centrifuges.

In some cases, water treatment plants also use air-driven drag pumps in parallel with screw presses in their feed system to supply sludge to the screw presses and decanter centrifuges.

Why use decanter centrifuges for separation?

Decanter centrifuges are high-performance solid bowls engineered for sludge treatment. These systems are capable of processing any type of sludge, making them extremely suitable for centralized dewatering plants (plants that receive different sludge from different regions).

Advantages of using decanter centrifuges

The primary advantage of using decanter centrifuges for wastewater treatment is the elimination of the need to transport sludge. Also, centrifuges eliminate odors and provide operator safety by eliminating contact with solids.

The use of decanter centrifuges also increases the storage capacity of a plant's sludge tanks because they can handle higher concentrations of solids than other dewatering processes. A decanter centrifuge can process a sludge that is five to 20 times more concentrated than the liquid it receives.

Centrifuges can also be used in liquid-solid separators without screw presses to dewater high-solids digester sludges. The resulting cake can be stored in a silo or sent to drying beds before being loaded for disposal.

Centrifuge technology offers many other benefits to wastewater treatment facilities, including enhanced system flexibility, improved operator safety and maximized storage capacity. This equipment also provides decreased energy consumption costs, more effective sludge inventory management, and higher-value saleable end products.

Are you looking for a new centrifuge?

Vision Machine decanter centrifuges are the most powerful wastewater separation centrifuges on the market. They are designed to process wastewater from treatment plants, but they can also be used to separate other liquids and solids.

If you’re looking for an efficient way to separate  solids from wastewater, then look no further than Vision Machine’s line of decanter centrifuges!

At Vision Machine Inc. we specialize in the manufacturing and repair of horizontal decanter centrifuges and have been doing so since 2004. Our machines come in different sizes depending on how much you need them to handle - Contact us today about our products and services!

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About Vision Machine

Vision Machine Inc. specializes in the manufacturing and repair of horizontal decanter centrifuges and has been doing so since 2004. We offer centrifuge manufacturing, custom centrifuge manufacturing, centrifuge repair, centrifuge replacement parts, and centrifuge controls from leading manufacturers.

From centrifuges that remove high-value solids from liquids, refining processes, or waste recycling and minimization, Vision Machine Inc. has a separation system to meet your needs.  Vision Machine works with a variety of industries including the oil and gas sector, refining/petrochemical, agriculture, dairy, municipal, rendering, food & beverage, and horizontal directional drilling.

At Vision Machine, Inc., we pride ourselves on providing our customers with the highest value, the lowest total cost of ownership and easiest to operate separation systems available. All proudly made in America at our Spring, TX facility.