The Application of A High-Pressure Round Filter Press in Construction Waste Treatment

The application of a high-pressure round filter press in construction waste treatment is mainly reflected in the solid-liquid separation link. It can effectively treat wastewater and mud, reduce water resource consumption, reduce pollution emissions, and realize resource recycling. The treatment process of construction waste will produce a large amount of mud and wastewater, containing fine particles, dust, and harmful substances. Untreated wastewater may cause pollution to the surrounding environment, and high-pressure round filter presses have shown significant advantages in this regard. The following will introduce the application of round filter presses in construction waste applications.

Characteristics of Construction Waste

Complex composition
Construction waste is usually composed of concrete, bricks, tiles, mortar, waste wood, metal, plastic, glass, and other materials. These different materials have significant differences in composition and properties, making separation and recycling challenging.
High moisture content
Construction waste often contains a lot of moisture, especially during demolition and cleanup. Due to open-air stacking and weather conditions, the moisture content of the waste may be high, increasing the difficulty of handling and transportation.
Large volume, low density
Construction waste is usually large in volume but low in density, so it takes up more space when transported and stacked. Uncompressed construction waste is expensive to store and transport because it contains a lot of voids and lightweight materials. Compression, separation, and volume reduction are important to reduce stacking space requirements and transportation costs.
Contains a small amount of hazardous substances
Some construction waste may contain hazardous substances such as heavy metals, paint residues, asbestos, etc., which may cause harm to the environment and human health if not handled properly. Hazardous substances must be properly separated and treated before recycling and landfill.

Specific Application Steps of Circular Filter Press

Pretreatment stage
Before entering the filter press, construction waste usually needs to be pretreated, especially screening and crushing. Large particles in construction waste (such as bricks and concrete blocks) will be screened or crushed first to reduce the particle size, which is conducive to the subsequent filter-pressing process. At the same time, harmful substances (such as heavy metals and paint residues) should be removed as much as possible to ensure safety and stability in subsequent processes.

Mud mixing and conditioning
After screening, the fine particles and mud are conditioned. Depending on the nature of the mud, it may be necessary to add flocculants (PAM/PAC) or adjust the pH value so that the solid particles aggregate into flocs to improve the filtration efficiency. After conditioning, the viscosity of the mud is reduced, which is more suitable for the filter press process.

Feeding
The conditioned slurry enters the circular filter chamber and is pressed through a plunger pump. The filter cloth in the filter chamber traps the solid particles on one side of the filter cloth, while the water is discharged through the filter cloth. The amount of slurry injected should be properly controlled to avoid overfilling and affecting the filtering effect.

Pressurized filtration
The circular filter press starts the pressurization system and applies high pressure to the mud in the filter chamber through the high-pressure pump, so that the water in the mud is accelerated to pass through the filter cloth, and the solid gradually forms a filter cake on the surface of the filter cloth. The high pressure ensures that the water in the mud is squeezed out to the greatest extent, and a dry filter cake is obtained, thereby reducing the difficulty of subsequent processing and transportation costs.

Discharging and cake cleaning
Once the filtration is complete, the filter press automatically opens and the cake falls off the filter cloth and is discharged. The cake can be used as a building filler or further processed and recycled into building materials such as aggregate. At this point, the filter cloth must also be cleaned to ensure that it is not blocked and to maintain the filtration efficiency of the equipment.

Advantages of Round Filter Press

High-pressure filtration, a better dehydration effect
The round filter press can apply higher pressure during the filtration process, making the moisture content in the solid filter cake lower and the filter cake drier. This high-pressure dehydration effect is very suitable for processing mud and fine particles in construction waste. Ordinary filter presses are usually not as good as high-pressure round filter presses in dehydration effect, especially when processing viscous construction mud.
Strong wear resistance and corrosion resistance
The filter plates of circular filter presses are usually made of pure PP materials with high wear resistance and corrosion resistance, which are suitable for processing hard particles and corrosive components in construction waste. Construction waste contains hard materials such as stones and concrete powder. The filter plates of ordinary filter presses are easy to wear, while circular filter presses are more durable and have low maintenance frequency, which reduces the long-term use cost.
Longer service life and stability
Due to the design and material selection of the circular filter press, which is more durable, especially the characteristics of pressure resistance and wear resistance, it has a longer service life and higher stability in the frequently used construction waste treatment. Ordinary filter presses wear faster under high-intensity operation and have a relatively short service life.

Conclusion

High-pressure round filter presses have broad application prospects in the treatment of construction waste, especially in the field of urban construction waste treatment. It not only improves the treatment efficiency but also reduces the long-term operating costs. With the increasingly stringent environmental protection policies and the improvement of the concept of resource recycling, the demand for this type of equipment will further increase.

The Application of A High-Pressure Round Filter Press in Construction Waste Treatment