Shandong Ningye Machinery Equipment Co., Ltd. is one of the leading manufacturers and suppliers of sewage sludge scraper in China. With a professional production team, we are able to meet the needs of the majority of our customers. Please feel free to buy durable sewage sludge scraper at low price from our factory.
Product Overview
The Sewage Sludge Scraper is a bottom-sludge removal device designed and manufactured by our company for municipal wastewater treatment plants, water treatment plants, and industrial wastewater projects. This equipment is installed at the bottom of sedimentation tanks. Through mechanical rotation or reciprocating motion, it scrapes settled sludge from the tank floor to the central sludge hopper. At the same time, it pushes surface scum to the peripheral scum discharge ports, completing solid-liquid separation and sludge discharge operations.
Our company operates independent design, machining, and assembly workshops. We control the entire process from structural design to final product delivery. All units can be customized according to customer tank geometry, water quality, and sludge volume.
Working Principle
Wastewater enters the sedimentation tank through the inlet. Flow velocity decreases, and suspended solids and activated sludge settle to the tank bottom under gravity.
Clarified effluent discharges through the peripheral overflow weir or outlet channel.
The scraper starts. The scraper arm rotates around the central pivot (or reciprocates along the tank length).
The scraper blade, designed in a logarithmic spiral curve, pushes sludge along the tank floor toward the central sludge hopper.
The scum scraper blade pushes floating scum to the peripheral scum trough, which discharges through the scum pipe.
Sludge in the central hopper is removed from the tank by one of the following methods:
- Hydrostatic pressure gravity discharge
- Pump suction discharge
- Siphon discharge
- Combined pump-siphon discharge
Blade Design Note: The scraper blade follows a logarithmic spiral curve for even force distribution. When the blade encounters an obstacle on the tank floor, the scraper arm lifts automatically around the vertical axis, passes the obstacle, and returns to position. This protects the equipment from damage.
Structural diagram
Structural Components
|
Component |
Material |
Function |
|
Drive Unit |
Motor (SEW/Siemens/premium domestic) + cycloidal reducer / worm gear reducer |
Provides rotational power with over-torque protection. The unit stops automatically and triggers an alarm when the preset torque is reached. |
|
Main Beam (Working Bridge) |
Q235B carbon steel + hot-dip galvanizing, galvanizing layer ≥ 86μm (above-water section) |
Carries scraper arms, blades, and walkways. Truss structure with high rigidity. |
|
Scraper Arm |
Carbon steel + galvanizing / 304 stainless steel |
Connects the main beam to the scraper blade. Angle is adjustable. |
|
Scraper Blade |
304/316L stainless steel frame + rubber edge (NBR) |
Contacts the tank floor. The rubber edge is replaceable when worn. |
|
Central Pivot |
Carbon steel + stainless steel bearing |
Supports the entire unit. Fitted with a slip ring (peripheral drive type). |
|
Scum Removal Device |
304 stainless steel scum baffle + scum trough |
Collects surface scum and directs it to the discharge pipe. |
|
Current Collection Device |
Carbon brush + copper ring (peripheral drive) / slide wire (bridge type) |
Supplies continuous power to rotating components. |
|
Control Panel |
Outdoor type, IP55, stainless steel / powder-coated carbon steel |
PLC-controlled. Supports remote signal input. Includes over-current, over-torque, and limit protection. |
|
Sludge Discharge Pipe |
304 stainless steel / HDPE |
Connects from the sludge hopper to the sludge pump or discharge channel. |
Material Standards
|
Service Environment |
Recommended Material |
Reason |
|
Municipal wastewater (pH 6~9) |
Q235B + hot-dip galvanizing (above water), 304 stainless steel (below water) |
Balanced cost and corrosion resistance. |
|
Sulfur-containing / chlorine-containing industrial wastewater |
316L stainless steel (all below-water parts) |
Resists chloride corrosion and H₂S. |
|
Strong acid/alkali wastewater (pH < 4 or > 11) |
316L stainless steel / duplex steel 2205 / rubber-lined |
Customized per medium. |
|
Blade rubber edge |
NBR (nitrile rubber) or EPDM |
Wear-resistant, oil-resistant, aging-resistant. |
|
Walking wheels |
Polyurethane solid wheel / nylon wheel |
Wear-resistant, does not damage tank floor coating. |
|
Chains (chain-drive type) |
Reinforced nylon / UHMW-PE (non-metallic chain type) |
Corrosion-free, low maintenance. |
Sludge Discharge Methods
|
Discharge Method |
Principle |
Applicable Conditions |
|
Hydrostatic Gravity Discharge |
Uses the level difference between the sludge hopper and the discharge pipe outlet |
Tank depth ≥ 4m, discharge point below tank floor |
|
Pump Suction Discharge |
A sludge pump draws sludge from the hopper |
Any tank depth, remote discharge |
|
Siphon Discharge |
Uses siphon principle for automatic discharge |
Tank depth ≥ 4m |
|
Combined Pump-Siphon Discharge |
Siphon as primary, pump as backup |
Large tanks, high sludge concentration |
Our company recommends or combines the above methods based on customer operating conditions.
Application Fields
|
Industry |
Typical Application |
|
Municipal Wastewater Treatment |
Primary clarifier, secondary clarifier, radial flow sedimentation tank |
|
Water Treatment Plant |
Clarifier, thickener, sedimentation tank bottom |
|
Chemical Wastewater |
Oil-water separator, chemical sedimentation tank |
|
Pulp & Paper / Textile Dyeing |
Sedimentation tank, thickener |
|
Food / Pharmaceutical |
Wastewater sedimentation tank |
|
Metallurgy / Mining |
Tailings thickener, slurry sedimentation tank |
|
Petrochemical |
Oil-water separator, oily sludge tank |
Manufacturing Capability and Service
|
Item |
Details |
|
Design Capability |
Staffed with structural and mechanical engineers. We produce directly from customer tank drawings. We also assist with equipment selection. |
|
Production Capability |
CNC cutting, automatic welding, shot blasting, hot-dip galvanizing line. Annual output: 200+ units. |
|
Quality Control |
Raw material incoming inspection → Welding NDT → Whole-machine test run → Factory inspection report. |
|
Spare Parts Supply |
Blade rubber edges, walking wheels, carbon brushes, and other wear parts are kept in stock. Shipment within 48 hours. |
Parameters Required for Selection
To provide an accurate quotation and drawing, please supply the following information:
|
No. |
Parameter |
Description |
|
1 |
Tank type and dimensions |
Circular: diameter D. Rectangular: length L × width W. |
|
2 |
Effective water depth |
From tank floor to overflow weir. |
|
3 |
Sludge volume |
kgDS/h or m³/h. |
|
4 |
Water quality |
pH, temperature, oil content, chlorine content, and other special components. |
|
5 |
Preferred sludge discharge method |
Gravity / pump suction / siphon / combined. |
|
6 |
Power supply conditions |
Voltage, frequency, on-site control method. |
|
7 |
Installation method |
Above-tank mounting / in-tank mounting (suspended type). |
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