Rotary bar screen

Rotary bar screen | Automatic solid-liquid separation, continuous cleaning

Rotary bar screens are the most commonly used mechanical bar screens in wastewater treatment and water intake projects. They are used to continuously intercept and remove various suspended solids in water, such as plastic bags, fibers, branches, fruit peels, weeds, and fine particles. The equipment employs a unique rake tooth structure or chain plate design, automatically scooping out the screenings through rotation and conveying them to the upper discharge port, preventing screenings from accumulating and causing blockages. They are widely used in municipal wastewater treatment plants, industrial wastewater pretreatment, pumping stations, rainwater storage tanks, and water supply plants.

core components

Drive unit: Cycloidal pinwheel reducer motor or helical gear reducer motor, reliable overload protection, adaptable to frequent starts.

Rotary chain/rake tooth assembly: High-strength nylon rake teeth or stainless steel chain + rake combination, gap selectable (1mm–50mm).

Frame and guide rail: Carbon steel epoxy anti-corrosion or stainless steel 304/316, with embedded parts or flange mounting structure.

Upper drive wheel + lower driven wheel: Drives the rotary mechanism for smooth operation.

Slag removal device: Brushes or scrapers automatically clean the slag on the rake teeth, ensuring clean slag removal.

Electrical control box: Enables time/liquid level difference linkage control, automatic start/stop, and fault alarm.

Working principle

The equipment is installed inside the canal at a steep angle. A drive unit rotates a rake chain or rotary chain. When the rake teeth pass the screen interception surface, they lift the intercepted screenings upwards along the guide plate. At the top discharge port, a cleaning brush or scraper automatically removes the screenings, which fall into a conveyor or hopper. Empty rake teeth continue to circulate to the bottom to rake again, achieving continuous cleaning.

Main advantages

Fully Automatic Operation: Automatically starts and stops based on the liquid level difference before and after the screen or time intervals, requiring no manual intervention.

High Separation Efficiency: Effectively intercepts even fine screenings, preventing blockages in subsequent pumps and pipelines.

Wear-Resistant and Durable: Nylon rake teeth are corrosion-resistant and self-lubricating; stainless steel construction is suitable for corrosive environments.

Overload Protection: Mechanical shear pins or electronic overload sensors automatically stop and alarm when encountering obstructions.

Easy Maintenance: Modular assembly; rake teeth can be replaced individually without disassembling the entire machine.

Customizable Channel Width/Depth: Channel widths up to 3 meters and depths up to 10 meters.

Technical parameters

Bar screen width: Customizable

Ditch depth: Customizable

Gap: 1mm–50mm (commonly 3/5/10/15/20mm)

Discharge height: Customizable

Installation angle: 60°–85° (commonly 70°, 75°)

Motor power: 0.55–3.0kW

Rake tooth material: Nylon (PA6) / Stainless steel 304/316

Frame material: Carbon steel with epoxy coating / Stainless steel 304/316

Applications

Municipal wastewater treatment plant inlet channels, pump station bar screens

Industrial wastewater pretreatment (textile, printing and dyeing, food, leather, papermaking)

Rainwater pumping stations, flood control and drainage gates

Waterworks intakes, irrigation canals

Wastewater interception in aquatic product processing and slaughterhouses

We can provide precise drawings based on your channel dimensions, flow rate, bar screen size, and media corrosivity.

Company Profile

AA SS AQUA HITECH CO., LTD. was established in 2005 in Shenzhen, China. It is a leading technology enterprise specialized in the design, manufacturing, installation, commissioning and maintenance of technical solutions for high-difficulty industrial wastewater treatment projects.

Since its establishment, the company has been fully committed to the research of treatment technologies for high-difficulty and refractory industrial wastewater, wastewater recycling and reuse technologies, and wastewater zero-discharge technologies. It strives to achieve low project costs, high outputs and optimization of total social resources.

The water treatment technology solutions and achievements developed by the company have been widely applied in multiple fields of high-difficulty and refractory organic wastewater treatment, including pharmaceutical wastewater, chemical wastewater, pesticide wastewater, laboratory wastewater, coal chemical wastewater, petrochemical wastewater, breeding wastewater, slaughterhouse wastewater, semiconductor wastewater, printing and dyeing wastewater, coating wastewater, landfill leachate, food processing wastewater, mechanical processing wastewater and domestic wastewater.

Adhering to the business philosophy of leading technology, first-class quality and sustainable service, the company endeavors to provide customers with strong technical support and realize the sustainable development and utilization of water resources.

The electrochemical wastewater treatment equipment independently developed and invented by our company can achieve a removal rate of over 99% for COD and ammonia nitrogen in refractory industrial organic wastewater featuring high salinity, high toxicity, high concentration and strong acidity or alkalinity. It has solved the long-standing problem of high-difficulty and complex wastewater treatment in the industrial wastewater treatment industry, representing a significant breakthrough in the treatment scope, methods and effects of high-difficulty and complex industrial wastewater.

CQDHX SERIES EO Electrochemical Advanced Oxidation Technology

Cutting-edge Electrode Manufacturing Technology

Over a 15-year period starting from 2010, we have been dedicated exclusively to the R&D, manufacturing and application of electrodes. Having completed more than 3,000 verification tests on electrode materials and manufacturing processes, as well as over 5,000 experiments on different types of highly complex wastewater, we have tailored the compositions of electrode substrates, surface materials and the deposition conditions of electrode surfaces by integrating the characteristics of various highly complex wastewater types. This has enabled us to achieve optimal performance in treating different categories of highly complex wastewater.

The CQDHX Series Electrode Modules are capable of meeting the requirements for treating highly complex industrial wastewater under extreme conditions. They can effectively remove organic matter (COD), ammonia nitrogen, toxic substances, bacteria, chromaticity, phosphorus and various heavy metals from refractory industrial organic wastewater characterized by high salinity, high toxicity, high concentration and strong acidity or alkalinity.

Working Mechanism of CQDHX SERIES EO Electrode Modules

Electrochemical oxidation is a technology that utilizes an applied electric field to drive chemical reactions for pollutant degradation. Its core reaction occurs at the anode of the electrolytic cell, and the operating mechanisms are primarily categorized into two types: direct oxidation and indirect oxidation, which often function synergistically.

Direct Oxidation Mechanism: Pollutant molecules migrate to and adsorb onto the anode surface. Subsequently, the anode, acting as an electron acceptor, directly extracts electrons from the pollutant molecules, causing their oxidative decomposition. This process is controlled by the mass transfer rate and relies on the catalytic activity and adsorption properties of the anode material, exhibiting a certain degree of selectivity towards different pollutants.

Mechanism of Indirect Oxidation: The anode does not directly oxidize pollutants. Instead, it generates highly oxidizing agents by electrolyzing components within the solution. These agents then diffuse into the bulk solution and carry out homogeneous oxidation of the pollutants. Depending on the type of oxidants generated, the main pathways can be categorized as follows:

Electrochemical oxidation achieves pollutant degradation through two main mechanisms: electron transfer at the anode surface and the in-situ generation of highly oxidizing species. In practical applications, particularly for complex wastewater systems, direct and indirect oxidation often work synergistically. By optimizing electrode materials and process parameters, efficient and advanced treatment of organic pollutants can be achieved.

 Technical Advantages

High Salinity Tolerance: It can effectively remove COD and ammonia nitrogen from unsaturated saline wastewater with a removal rate of up to 99%.

High Toxicity Tolerance: It can effectively remove COD and ammonia nitrogen from highly biotoxic wastewater with a removal rate of up to 99%, while efficiently eliminating the biological toxicity of the wastewater.

High Concentration Tolerance: It can effectively remove COD and ammonia nitrogen from high-concentration organic industrial wastewater with a COD level of ≤ 450,000 mg/L, achieving a removal rate of up to 99%.

Strong Acid-Alkali Tolerance: It can effectively remove COD and ammonia nitrogen from strongly acidic or alkaline wastewater with a pH value ranging from 1 to 11, with a removal rate of up to 99%.

High Safety: The equipment operates at a DC voltage ranging from 3 to 15V, causing no harm to the human body.

No chemical agents are added during wastewater treatment, and no residues or solid wastes are generated.

The electrode modules operate without scaling or clogging.

The equipment achieves a removal rate of 75–100% for high ammonia nitrogen, cyanide breakdown, decolorization, and other pollutants.

No pH adjustment is required for incoming wastewater, which significantly saves on acids, alkalis, labor costs, and floor space, while avoiding secondary pollution.

No water dilution is needed to reduce the salinity of incoming wastewater, decreasing the system’s treatment load and conserving resources.

No water dilution is needed to reduce the COD concentration of incoming wastewater, decreasing the system’s treatment load and conserving resources.

The equipment features a small footprint, occupying approximately 2% of the floor space required by traditional processes of the same capacity.

The equipment has no special environmental requirements and can be installed in well-ventilated, rainproof, non-explosion-proof areas.

The equipment operates with no noise and zero discharge of secondary pollutants.

It features fully automated operation, which is simple, safe, and does not require on-site personnel monitoring.

Equipment Specifications: 0.5T–1000T/h

Electrochemical Oxidation Equipment for Treating Common Pollutants

Application Scenarios:

Treatment of Refractory and Toxic Pharmaceutical Wastewater

Treatment of Refractory and Toxic Chemical Industry Wastewater

Treatment of Refractory and Toxic Pesticide Wastewater

Treatment of Refractory and Toxic Laboratory Wastewater

Treatment of Refractory and Toxic Coal Chemical Industry Wastewater

Treatment of Refractory and Toxic Petrochemical Wastewater

Treatment of Aquaculture Wastewater

Treatment of Slaughterhouse Wastewater

Treatment of Refractory and Toxic Semiconductor Industry Wastewater

Treatment of Refractory and Toxic Dyeing Wastewater

Treatment of Refractory and Toxic Painting/Paint Coating Wastewater

Treatment of Refractory and Toxic Landfill Leachate

Treatment of Food Processing Wastewater

Treatment of Refractory Machining Wastewater

Treatment of Domestic Sewage