Mechanical dewatering involves separating the liquid and solid components to reduce waste volume and weight for disposal. It can be performed using belt presses, filter press machines, hydro cyclones, shaker screens, and screw presses. Unlike geotextile bags requiring a large footprint, a belt press utilizes a porous tube that the dredged material is pumped directly into. Polymer or coagulant is injected into the system to help the clear water separate from heavier solids.
Reduced Risk of Contamination
Construction sites are full of equipment and materials that must be protected from excess water. Mechanical dewatering services help eliminate excess moisture from the site, reducing risks and making it safer for workers to operate equipment. Mechanical dewatering removes water from sludge and reduces its volume, which lowers the cost of final disposal or treatment steps. It also helps to prevent contamination and improve the quality of the dewatered material.
Sludge dewatering is often used in wastewater treatment, image processing, and food & beverage industries. Mechanical dewatering machines such as centrifuges or screw presses use mechanical force to separate solids from liquids. They are designed to meet specific needs, such as continuous operation or low energy consumption. A good example is the Bucher piston press, used for over 50 years in apple juice extraction.
Dewatering equipment offers a great return on investment. Reducing sludge accumulations reduces transportation costs, storage expenses, and the need for extensive sludge management facilities. Additionally, mechanical sludge dewatering generates dry, high solids cakes, which improve handling capabilities. The consistent cake dryness also reduces the cost of post-dewatering treatment steps such as heat drying and incineration.
With energy and labor costs escalating, it is essential to consider the overall life-cycle cost of any water treatment system. In addition to optimizing dryers and evaporators, mechanical dewatering equipment should be appropriately evaluated for its impact on sludge quality and disposal operations. This should include bench and pilot testing and characterization of the quality and quantity of residuals. The proper design and selection of each system’s optimal mechanical dewatering equipment should follow this.
Mechanical dewatering systems can be a cost-effective, scientifically viable alternative to lagoons for municipal wastewater treatment plants and industrial wastewater treatment. However, the appropriate design of a mechanical system requires important information on raw water characteristics and the quality and quantity of residuals that will be generated. Mechanical sludge dewatering equipment comprises belt filters, screw presses, or decanter centrifuges. When selecting the best mechanical dewatering system, it is necessary to understand your facility’s daily, weekly, and monthly productions. This will help ensure the equipment is appropriately sized for maximum performance and longevity.
Whether in construction or wastewater treatment plants, dewatering helps reduce the risk of accidents and equipment failure by temporarily lowering the water level at your site. It also allows for easier excavation, foundation excavation, and cement footing pours by minimizing the amount of material that needs to be moved.
Mechanical dewatering equipment like belt presses effectively reduce sludge volume, reducing waste disposal costs. Other options for dewatering sludge include filter presses and solid bowl centrifuges. These systems can significantly reduce disposable costs and energy consumption compared to traditional means. Additionally, their ability to achieve high levels of solids retention and filtrate quality makes them environmentally friendly options.
Dredging can be lengthy and time-consuming, often leading to construction delays. With an effective dewatering strategy, workers can remain productive and on schedule. Once bench and pilot testing has been completed, a mechanical dewatering plant can be constructed to provide a high level of performance. Unlike drinking water plants that use smaller-scale equipment, mechanical dewatering equipment uses full-scale units.
This provides accurate information on press throughput, polymer feed rates, cake solids concentration, and filtrate quality, among other factors. The best method for the specific application can be determined using this information. This can include gravity thickening, centrifugation, or dissolved air flotation. Once the dredged material is dry, it can be hauled away and used for various applications, including topsoil, landfill cover, and more.
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