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How Innovations in Sludge Dewatering Technologies Have Reduced Wastewater Processing Costs

Sludge handling and disposal are one of the costliest expenses for wastewater treatment facilities. Traditionally, sludge dewatering has been one strategy for reducing costs, as the volume and weight of sludge waste can be greatly reduced through effective dewatering. The result: Reduced disposal costs, improved water recycling and increased savings.

Since the 1970s, a number of important advancements in wastewater treatment have made sludge dewatering more efficient and effective, helping facilities save millions. Which innovations have made the biggest difference? A few actually – including centrifuges, belt filter presses and vacumatic dewatering systems – have greatly advanced the industry and improved wastewater treatment outcomes.

Sludge Dewatering Technologies

Innovative wastewater treatment technologies are available on the market today. Yet, ultimately, the machine that you choose will depend on a number of factors, including the consistency of the slurry, space and budget requirements, and the time needed for dewatering.


Throughout the 1980s and 1990s, centrifugal technology for wastewater treatment was experimented with and improved. The process works like a laundry washing machine, as the high-speed spinning draws the water from the solids. Predominantly utilised as a separator of water and solids at a differential of 95% water and 5% solids.

Traditionally, centrifuges are most effective when the sludge is consistent. However, Interfil has developed a patent technology offering automated detection of a full bowl and automatically discharges the collected solids enabling continuous uninterrupted operation. Please refer to the Interfil Centrifuge IC45-AV

Belt Filter Presses

Belt Filters use pressure to the slurry to wring liquid out of the solid waste. Simply put, the sludge is fed through a series of tensioned belts, and high pressure and gravity separate liquids from the solid. Problems are encountered when the filter belt becomes blocked with solids or blinded by unwanted oils or grease.  The belt should be washed with high-pressure hot water.

Another problem often encountered when hard solids enter the belt such as rocks, steel bolts from the process or other foreign items and when squeezed between the belts cause damage to the belt and render the filter presses out of service until later repaired.  For this reason, we offer the Vacumatic Dewatering system to avoid all of these problems.

Vacumatic Dewatering

Vacuum enabled dewatering systems have greatly improved since they rose to popularity in the 1970s. These systems essentially draw water – through vacuum suction – through a filtering membrane. Different types of filtering membranes can be used depending on the type of sludge. The result is a higher solids capture rate, and with vacumatic systems, the waste solids are typically much drier. Interfil produces a vacumatic sludge dewatering system suitable for many flow rates.

30 Years of Wastewater Processing Innovation at Interfil

Since 1986, Interfil has produced liquid waste processing equipment to wastewater treatment facilities in Australia. Today, we offer centrifugal and wastewater processing equipment, as well as a range of products, which are distributed throughout the world.

Through our 30-year history, we’ve developed a vacuum-assisted sludge dewatering system that results in:

* Drier waste cakes
* Cleaner water
* Reduced operating costs

Yet, we’re continually improving and refining our systems to deliver improved efficacy. We believe it’s critical for wastewater treatment facilities to choose experienced and established equipment manufacturers that have a track record of innovation. The benefits for choosing high-quality equipment are clear: Reduced disposal and operating costs.

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