Peripheral Drive Scraper and Suction Sludge Collector
For large circular / radial-flow sedimentation tanks with diameters of tens of meters, center drive results in excessive rotational load, long scraping distance, and uneven sludge discharge, making it easy for sludge to accumulate at the far end. The peripheral drive scraper and suction sludge collector moves the drive unit to the tank-side track, where the peripheral traveling wheels drive the entire bridge to rotate around the center. The load is distributed, making it suitable for large spans. It steadily scrapes sludge from the bottom of the entire large-diameter tank toward the center for discharge, making it the main sludge removal equipment for circular tanks in large water supply plants and wastewater treatment plants.
I. Product Positioning
The peripheral drive scraper and suction sludge collector is specialized sludge removal equipment for the bottom of large-diameter circular / radial-flow sedimentation tanks. Unlike center drive, its drive unit is arranged at the peripheral end beam (motor + reducer + traveling wheels), traveling along the tank perimeter track and driving the working bridge (entire bridge) spanning the tank to rotate around the center support; the center support only serves as a rotational bearing and does not provide driving force. The scraper blades on the scraper arm scrape and collect sludge from the tank bottom along the slope to the central sludge collection pit, then discharge it through the central sludge discharge pipe. According to the bridge form, it is divided into half-bridge type (single-side drive, cantilever scraping) and full-bridge type (double-end dual drive, double-side scraping), and can integrate scum skimming and flow stabilization devices.
II. Working Principle (Brief)
Peripheral drive: The drive unit on the tank-side end beam (motor + reducer + traveling wheels) travels along the tank perimeter track, driving the entire bridge to rotate around the center support.
Entire bridge rotating scraping: The scraper arm / scraper blades rotating with the bridge continuously scrape and collect sludge from the tank bottom along the slope toward the central sludge collection pit, covering the entire large-diameter tank bottom.
Central sludge discharge: Sludge collected in the central sludge collection pit is continuously or intermittently discharged out of the tank through the central sludge discharge pipe / valve.
Scum skimming (optional): The scum scraper at the front end of the scraper arm scrapes floating scum on the water surface to the peripheral scum discharge hopper, completing surface cleaning.
Flow stabilization (optional): The inlet flow stabilization cylinder weakens inlet disturbance and ensures stable sedimentation conditions in the tank.
Continuous rotating operation: Low-speed rotation in continuous or intermittent mode, with automatic start-stop control and linkage with sludge level, requiring minimal attendance.
Process schematic: peripheral drive traveling → entire bridge rotating around center → scraper blades collecting bottom sludge → converging to central sludge collection pit → discharged through central sludge discharge pipe ⇄ (optional) scum skimming / flow stabilization
The core lies in "drive at the periphery, rotation at the bridge"—transferring the driving force from the tank center to the tank periphery, avoiding the load bottleneck of center drive under large diameters. It is suitable for large spans and heavy loads, and can steadily push far-end accumulated sludge toward the center along the entire bridge, achieving uniform sludge discharge and stable operation.
III. Core Advantages
① Dedicated for large diameters The ideal sludge removal solution for circular tanks with diameters of tens of meters or even up to 100 meters, and the first choice when center drive load is limited.
② Peripheral drive with distributed load Drive at the tank periphery with distributed load, suitable for large spans and heavy loads, making the structure safer.
③ Half-bridge / full-bridge optional Half-bridge type is economical and compact; full-bridge type with dual drive and double-side scraping is more uniform and stable.
④ Stable rotation and low energy consumption Low-speed rotation and low power, suitable for long-term continuous operation of large tanks.
⑤ Integrated scum skimming and flow stabilization Optional scum scraping and flow stabilization cylinder, integrating sludge scraping, scum skimming, and flow stabilization in one machine.
⑥ Easy maintenance Peripheral drive components are at the tank side for easy inspection and repair; the center support structure is simple and reliable.
IV. Main Technical Parameters (Reference Range)
Item | Parameter Range / Description | Remarks |
|---|---|---|
Applicable tank type | Circular / radial-flow sedimentation tank (large diameter) | Not rectangular or small-diameter tanks |
Tank diameter | Usually 20–100 m (can be larger) | Preferred solution for large diameters |
Peripheral linear speed / scraper arm rotation speed | About 1–3 m/min (low-speed rotation) | Adjusted according to diameter |
Drive mode | Peripheral drive (tank-side end beam traveling wheels) | Center only supports, does not drive |
Bridge form | Half-bridge / full-bridge | Selected by diameter and uniformity |
Center support | Rotational bearing (only supports rotation) | Does not provide driving force |
Auxiliary devices | Scum skimming, flow stabilization cylinder (optional) | Configured as needed |
Main material | Anti-corrosion carbon steel / stainless steel | Selected by water quality and service life |
Control mode | Local / remote, continuous / intermittent | Can be integrated into automatic control system |
Motor power | Determined by diameter and load | Low speed, low consumption |
* The above are typical reference ranges. Actual tank diameter, rotation speed, and bridge form shall be based on tank design and process requirements.
V. Typical Application Scenarios
Scenario / Industry | Adaptation Description / Main Function |
|---|---|
Large water supply plant radial-flow sedimentation tank | Continuous sludge removal from large-diameter circular tank bottom, ensuring stable effluent. |
Large primary / secondary sedimentation tank in wastewater treatment plant | Sludge removal from large-diameter tanks, maintaining system balance. |
Large sludge thickening tank | Scraping and thickening sludge discharge from large-diameter thickening tanks. |
Large-diameter circular tank for industrial wastewater | Sludge removal for various large circular sedimentation facilities in industrial wastewater. |
Large circular tank for reclaimed water reuse | Mechanical sludge removal for large circular sedimentation sections in reuse processes. |
Reservoir / lake water intake pretreatment | Sludge removal equipment for large-diameter pre-sedimentation tanks. |
Large-diameter circular tank for high-efficiency sedimentation | Supporting sludge removal equipment for circular high-efficiency clarification units. |
VI. Applicable Boundaries and Selection Recommendations
The peripheral drive scraper and suction sludge collector is only applicable to circular / radial-flow large-diameter sedimentation tanks; for medium and small diameters (about ≤20 m), center drive is more economical, and rectangular tanks should use traveling bridge type. During selection, determine half-bridge or full-bridge based on diameter and scraping uniformity (for large diameters and high uniformity requirements, full-bridge dual drive is preferred); the flatness and concentricity of the tank-side track are highly required, and construction must be strictly controlled. Underwater supports and rotating parts should be well protected against corrosion; in severe cold areas, attention should be paid to freeze protection and outdoor electrical protection; if there is much floating scum on the tank surface, it is recommended to equip a scum skimming device simultaneously.
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FAQ
How much does this equipment cost?
The price varies by treatment capacity, water quality, materials and configuration, so a custom quote is provided based on your actual conditions. We offer free water testing and solution design, with a detailed quote within 1 working day after requirements are confirmed.
What treatment capacity is available? Can it be customized?
Capacity is fully customizable, ranging from tens to thousands of tons per day (e.g. 0.5–30 m³/h), with non-standard design support matched precisely to your inlet/outlet requirements.
How long does delivery take?
Standard equipment typically takes about 2–4 weeks to produce; custom projects depend on scale and process. The delivery date is confirmed at contract signing, with design, manufacturing and shipping progressing on schedule.
Is installation and commissioning included?
Yes. We provide installation, system commissioning, operator training and environmental acceptance assistance, as well as long-term managed operation services on request.
What about after-sales and warranty?
We provide a warranty period and a 24/7 technical hotline, with free repair for non-human faults during the warranty period, plus spare parts supply and regular inspection services.
Make Large-Diameter Circular Tanks "Rotate Stably and Discharge Cleanly"
We can provide selection and complete supply solutions for peripheral drive scraper and suction sludge collectors based on circular tank diameter, bridge form, and automatic control requirements. Welcome to call or leave a message.
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Traveling Bridge Scraper and Suction Sludge Collector
Horizontal-flow, rectangular large-span sedimentation tanks have wide bottoms and accumulate a large amount of sludge. Manual sludge removal is time-consuming and labor-intensive, and uneven sludge discharge can easily form "dead sludge" that decays and floats up. The traveling bridge scraper and suction sludge collector uses a bridge truss spanning the tank to travel back and forth, scraping and collecting sludge from the tank bottom and suctioning it out of the tank, with simultaneous scum skimming. It enables mechanized and automated sludge discharge from sedimentation tanks and is standard equipment for horizontal-flow sedimentation tanks in water treatment plants and wastewater treatment plants.
Center Drive Sludge Scraper and Suction Machine
In circular / radial-flow sedimentation tanks, the tank bottom is sloped and sludge converges toward the center. If the sludge discharge device is not properly matched, problems such as "sludge accumulation around the periphery and incomplete discharge at the center" may occur, and sludge may even float due to anaerobic conditions. The center drive sludge scraper and suction machine uses center-of-tank drive and rotating scraper arms to continuously scrape and collect bottom sludge toward the central sludge collection pit for discharge, with simultaneous scum skimming and flow stabilization. It is the standard sludge discharge equipment for circular sedimentation tanks (including sludge thickening tanks) in water supply plants and wastewater treatment plants.