Up to 80 percent savings: HUBER Screw Press Q- ...

Dewatering degree and flocculant consumption determine operating costs

However, the operating costs and thus the economic efficiency of sludge dewatering are largely determined by the degree of dewatering and the flocculant consumption. These parameters are typically determined in advance by on-site tests on a real scale or in the laboratory, evaluated in the tender process and thus used to award the contract. The increasing sales figures of the HUBER Screw Press Q-PRESS® prove its competitiveness here.

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Rising energy prices, energy self-sufficiency and security of supply

Although the energy costs of sludge dewatering have so far played only a minor role in economic efficiency, a detailed consideration may make sense under the aspects of rising energy prices, security of supply or even energy self-sufficiency.

Electricity consumption of sludge dewatering

The electricity consumption of a sludge dewatering plant typically consists of the individual consumptions of feed pumps, conveying units, the flocculant preparation unit and the dewatering unit itself. While the peripheral plant components of a sludge dewatering system can typically be assumed to have a specific electricity consumption of approx. 15 kWh/tDR across all manufacturers, there are significant differences for the dewatering units.

Power consumption of a HUBER Screw Press Q-PRESS® demo unit

The diagram shows an exemplary evaluation of the power consumption of individual consumers of a demonstration unit of the HUBER Q-PRESS® at different wastewater treatment plants and under different load conditions. The specific power consumption of the peripheral plant components (without screw press) is approx. 15 kWh/tTR. Experience shows that this proportion is largely independent of the dewatering technology used.

Only 30 per cent of the total electricity consumption of sludge dewatering

The diagram shows that the screw press requires about 5 kWh/tDR and thus accounts for only 30% of the total electricity consumption of the sludge dewatering process. Differences in the specific energy requirements between the test locations are due to different solids loads and load conditions.

Compared to decanter centrifuges: screw press saves around 80 per cent energy

Using a modern decanter centrifuge results in a specific power consumption of about 40 kWh/tDR for the dewatering unit alone. The use of a screw press can therefore save approx. 80% energy compared to a decanter centrifuge.

The following example calculation, based on a sludge quantity of 1,000 t dry matter (approx. 50,000 PE), illustrates the financial savings potential: Assuming an electricity price of 0.26 EUR/kWh, the annual electricity costs for the decanter centrifuge are 10,400 euros, for the screw press only 1,300 euros.

A similar saving in operating costs of around 9,000 euros per year would result, for example, from:

• a permanent increase in the degree of dewatering by about 0.5 percentage points, assuming disposal costs of 100 EUR/tDR
• an average reduction in polymer demand of 3 kg/tDR at polymer costs of 3 EUR/kg

The low energy consumption of a screw press can thus influence the economic comparison with decanter centrifuges and significantly reduce the electricity consumption for sludge dewatering.
 

What Is a Filter Press?

Filter presses are industrial wastewater treatment products designed to dewater a slurry. This equipment features a tried and true design that uses pressure to remove impurities and suspended solids from industrial wastewater.

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Most filter presses consist of four primary components. These include a frame, the manifold system (piping and valves), filter plates and filter cloth. They are an efficient and effective solution for controlling waste, helping businesses of all sizes meet environmental obligations and maintain industry compliance.

How Do Filter Presses Work?

Filter presses go through cycles to filter wastewater. Cycle length depends on the equipment size, performance characteristics and water quality. The process most filter presses follow for sludge dewatering involves:

• Filling: During the filling stage, the press fills with slurry and distributes it evenly across the filter plates.
• Filtering: As pressure builds, the mixture presses against the filter cloth, separating the water and solids.
• Completion: When the chamber fills completely with filter cake, the cycle is complete and ready for a reset.

The Many Different Applications for Filter Presses

Many industries use filter presses for dewatering solids in wastewater in New England. They’re an efficient and cost-effective way to separate liquids and solids and available in a wide range of different sizes to meet virtually any need.

Some of the industries that most frequently rely on filter presses for wastewater treatment include:

• Food processing
• Edible oil production
• Chemical production
• Goods manufacturing
• Mining and aggregates
• Raw materials processing
• Municipal water treatment
• Pharmaceutical production
• Asphalt and cement production
• Machined components manufacturing

How to Select the Right Filter Press

There’s a lot that goes into selecting the right filter press, and every situation is different. You’ll want to make an informed selection to ensure you’re getting the performance you need at the best value.

Some of the things you’ll need to consider when making your selection include:

• Filter press location
• The slurry type and density
• Filter press operating conditions
• How much slurry you need to treat
• Any industry-specific requirements

Our team will help you determine which type and model machines will fit your facility, processes and budget.

Learn More About Our Filter Presses for Sale

New England Sales is your source for the region’s most impressive selection of sludge dewatering filter presses for sale in NH, ME, VT, MA, and all of New England. We also carry an extensive selection of other products from all the most recognized names. Browse our full product catalog to see all the options we offer.

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