LZZG Gravity Thickener Sizing

The core principle of gravity thickener sizing is gravity dewatering, which occurs in the zone where sludge entering the feed hopper is supported by filter cloth. This area comprises two sections: the sludge thickening section and the front portion of the pressing section. During this process, water within the sludge drains through the filter cloth via gravity, with the filtrate collected and recovered by the collection tray.

1. High-Quality Filter Cloth

This product features an adaptive rake distributor, a turning device, and a filter cloth arrangement with an inclined angle. The sludge distribution height is adjustable. The rake distributor maintains soft contact with the filter belt, preventing accidental damage. These design elements ensure uniform feed distribution, rapid water drainage, and improved gravity dewatering efficiency. Additionally, an adjustable leakage sealing strip is installed in this section. Made of polyurethane with a specific skirt width, the sealing strip ensures effective sealing without causing wear to the filter belt. To guarantee optimal performance in the gravity dewatering zone, the effective dewatering length of the concentration section exceeds 2.1 meters, while the effective gravity dewatering length of the filter press section exceeds 4.5 meters, fully ensuring the dewatering effect of the gravity dewatering stage.

2. Rational Sludge Feeding System

The sludge-polymer mixing unit captures fine air bubbles present in the dissolved air flotation (DAF) discharge, which can compromise the flocculation reaction efficiency. LZZG employs a specialized frame-type flocculation mixer for sludge and polymer blending, effectively removing entrained air bubbles from the slurry. This ensures tighter floc formation, maximizes polymer efficacy, and reduces chemical consumption. Our system utilizes an ascending counter-flow feeding mechanism with a feed weir width of up to 750mm, ensuring uniform sludge thickness and optimal flow dynamics. This design eliminates impact on the filter belt and effectively prevents secondary shearing of the flocs. Additionally, integrated feed distributors and level control devices guide and flatten the sludge layer, ensuring consistent water visibility through the filter belt and preventing lateral deviation or uneven thickness.

3. Automatic Inductive Belt Tracking System

Belt tracking is critical for reliable conveyor operation. This model features an automated correction system using proximity sensors and solenoid valves, overcoming the limitations of traditional mechanical trackers, such as susceptibility to jamming and wear.

easy to escape, and leak. The deviation correction device has high sensitivity and can detect the precise value of the position of the filter belt.

4. Efficient transmission system and speed control system

Reducer: Compared with traditional cycloidal reducers, this type of reducer offers higher transmission efficiency, lower energy consumption (2.2+0.75KW), reduced operating noise, superior reliability, and a sleek appearance.

VFD Speed Control: The filter belt speed for this model is regulated via variable frequency drive (VFD). Through the operation panel, equipment performance can be automatically adjusted to meet actual requirements, resulting in advanced technical specifications and reduced energy consumption.

Bearings: Wafangdian cylindrical roller bearings are used, offering extended service life and high load-bearing capacity.

5. Comprehensive Protection System for Sludge Dewatering Equipment

The dewatering system features integrated overload protection, alarm functions, and automatic motor shutdown for all constituent equipment. In the event of a filter belt breakage, the system halts operation and triggers an alarm. Low compressed air pressure also initiates an alert. If flocculant levels drop below the threshold, the system issues an alarm followed by a delayed shutdown. Emergency stop switches are installed on both sides of the dehydrator, complemented by relevant self-locking programs. Furthermore, interlocking safety protocols ensure that the main unit and associated equipment cannot be activated unless the air compressor is running.

6. Superior Aesthetic Design and Precision

The entire machine boasts a sleek appearance and high manufacturing precision. Stainless steel components—including the concentration section frame, water pan, and spray cover—are fabricated using advanced laser cutting technology, ensuring exceptional accuracy and smooth cut surfaces. The unit is equipped with a high protection rating and a transparent air source box, which not only enhances its visual appeal but also allows operators to easily monitor and adjust the source processing device.

7. Rational Design

The structural design is user-friendly, facilitating daily operation and maintenance. Integrated with a vertical dehydrator, the machine features a compact structure, reduced operating height, and ease of use and maintenance. Typically, operators can observe sludge flocculation in the thickening section while standing on flat ground, eliminating the need for climbing. Future replacement of filter belts and bearings is also more convenient. The flushing water pipe fixation utilizes a rotary clamp mechanism, allowing for quick disassembly and reassembly with a simple advance-and-twist motion, greatly simplifying individual cleaning of the water pipes.

8. Low Water Consumption & Efficient Flushing System

The equipment employs a boring-section flushing method combined with specialized high-power V-shaped fan nozzles, ensuring effective cleaning with minimal water usage. The entire flushing pipeline receives independent water supply from both sides, maintaining balanced overall flushing pressure. Each flushing network is equipped with regulating valves, enabling single-point circulation and simultaneous flushing at all points. Additionally, the volume of flushing water at each point ca

n be automatically adjusted according to needs. It significantly reduces the amount of flushing water, with consumption equivalent to 70%–80% of that required by traditional filter presses.

9. Low-Cost Operation

The overall operating cost is minimized. By adopting an advanced deviation correction method, we ensure the service life of the filter belt, reduce air leakage, and lower the operating costs of the air compressor. The system utilizes a fully automatic process combined with a reliable backwash method, resulting in flushing water consumption comparable to that of traditional filter presses. Thanks to the rational design of the equipment—specifically the large filtration areas in both the concentration and pressing sections—the sludge treatment efficiency is high, while the final cake moisture content remains low. Consequently, flocculant dosage is significantly more economical.

Our technical department develops optimized processing plans and precise technical parameters through rigorous calculations, leveraging extensive test data from numerous successful projects and specific site conditions. For any technical inquiries, please contact us.