How to select belt press and filter press?
Belt filter presses and chamber filter presses are the special equipment for separating solids and liquids through filter cloth. Sludge, as the the main material treated, which is coproduct of sewage treatment. The sewage is cleared after treatment and the pollutants are transferred to the sludge.
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How to choose the proper model?
Generally, belt sludge dewatering machine is composed of filter belt, roller cylinder, filter belt tensioning system, filter belt deflection system, filter belt washing system and filter belt drive system. When making model selection, the following aspects should be considered:
1. Filter belt. The high tensile strength, tortuosity, acid and alkali resistance, temperature resistance and other characteristics are required. At the same time, the appropriate woven texture should be selected according to the specific properties of sludge, to make filter belt have good gas permeability and interception performance of mud particles.
2. Deflection system of roller cylinder. It is usually done by pneumatic means.
3. Tensioning system of filter belt. It is also generally controlled by pneumatic system. The filter belt tension is generally controlled at -0.3-0.7 MPa, and the usual value is 0.5 MPa.
4. Belt speed control. Different types of sludge have different requirements on belt speed, that is, there is a range of belt speed control for any specific sludge. Within this range, the dewatering system can guarantee a certain processing capacity, and can get high quality mud cake.
Chamber filter press is extruded through the plate frame to make the water in sludge discharged through filter cloth to achieve the purpose of dehydration. It is mainly composed of concave man filter plate, frame, automatic-pneumatic closed system measuring plate suspension system, filter plate vibration system, air compression device, filter cloth high-pressure flushing device and body side photoelectric protection device. When selecting, the following aspects should be considered:
1. The requirement for solid content of mud cake. Compared with other types of dewatering machines, the chamber filter press has the highest solid content. If considering the factors of reducing the land occupation of sludge, the plate and frame filter press can be selected.
2. Frame material.
3. The material of filter plate and filter cloth. Corrosion resistance is required, and the filter cloth must have a certain tensile strength.
4. How the filter plate moves. The requirements can be fully or semi-automatically completed by hydraulic-pneumatic devices to reduce the labor intensity of operator.
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5. The filter cloth oscillates device to make filter cake easy to fall off. Compared with other types of dewatering machines, the biggest disadvantage of filter presses is that they have a large footprint.
Realted article: Belt press vs Filter press
Sludge dewatering is the process of separating the solid and liquid components that make up sludge waste. This is done to make the sludge easier and more cost-effective to transport and dispose of.
Many industries and municipalities turn to sludge dewatering as a way to meet waste minimization and sustainability objectives. There are many different technologies that can be used to remove water from sludge, including belt and plate and frame filter presses.
What is a Belt Press?
The belt press is most useful when a continuous operation is desirable. Typically a belt press produces between 18% and 25% solids by weight in the cake.
Belt presses work by removing sludge onto two different dewatering belts where freestanding water molecules are separated from the sludge by gravity and are collected by a trough. Next, the thickened sludge is pressed between two belt filters and squeezed under rollers to force excess water from the sludge. Finally, the sludge is scraped off the belt and collected in a bin while the water content is transferred back into a wastewater system for processing.
Since the belt press performs a continual action, it is most effective on high-volume waste streams. It is commonly used for the following applications:
- Paper mill sludge,
- River silt, and
- Municipal wastewater treatment plants.
What is a Plate and Frame Filter Press?
A plate and frame filter press uses pressure filtration to separate liquids from solids. Pressure is achieved through the use of a double diaphragm or in other cases, self-priming trash pumps.
There are two main types of filter presses that can be used:
- High-pressure plate and frame filter presses that typically produce filter cakes that are between 40% - 70% solids by weight.
- Low-pressure plate and frame filter presses that typically produce filter cakes that are between 25% - 50% solids by weight.
Plate and frame filter presses are useful when a high content of solid material are desirable in the filter cake. They operate by cycling so the batches they produce are referred to as &#;drops.&#;
Plate and frame filter presses are most often used in applications that deal with:
- Biological sludge,
- API separator sludge, and
- Various sludge types where, for disposal, the cake needs to be as dry as possible and contain a high amount of solids.
About Handex
Handex is a provider of Pumping, Dredging, Sludge Dewatering and Treatment of industrial and process wastes and sediments. Our staff includes experienced Project Managers, Operators, Technicians, Fabricators, Mechanics and Health and Safety Professionals. Our objective is to meet and exceed client expectations while providing cost-effective services. In some cases, our clients find that the value of the raw materials returned to the process may pay for a portion of the sludge dewatering cost.
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