Continuous Dewatering Environmental Protection Equipment Stacked Screw Dewaterer for Municipal Wastewater Treatment

Equipment Description:

I. Working Principle
‌1. Belt Filter Press‌
After flocculation, the sludge enters the filter belt interlayer and passes through the gravity dewatering zone, the wedge-shaped pre-pressing zone, and the multi-roller high-pressure pressing zone, ultimately forming a sludge cake with a moisture content of ≤80%.
‌2. Stacked Screw Dewaterer‌
Propelled by the screw shaft, the sludge moves from the thickening section (wide filter slots) to the dewatering section (narrow filter slots). Internal pressure generated by the back pressure plate squeezes out moisture, achieving continuous dewatering with low energy consumption.
‌3. Centrifugal Dewaterer‌
The drum rotates at a high speed of 3000-4000 rpm. Centrifugal force deposits solid particles in the sludge on the inner wall. The screw conveyor discharges the sludge cake, and the filtrate is discharged through the discharge port.

‌II. Technical Parameters (Taking a Typical Model as an Example)

III. Application Scenarios
Municipal Wastewater: Belt filter presses are suitable for large-scale continuous treatment, with a processing capacity of 40 m³/h or more.
Food/Chemical Industry: Screw-type dehydrators are highly resistant to oil and dirt, making them suitable for oily sludge and small- to medium-scale applications.
Industrial High-Concentration Sludge: Centrifugal dehydrators can process sludge with a solids content ≥ 20%, achieving a separation efficiency ≥ 95%.

IV. Daily Maintenance Key Points
1. Filter Belt/Filter Cloth: Check wear daily, clean the filter mesh monthly, and replace the filter belt every six months (for belt-type models).
2. Lubrication System: Lubricate bearings and gears with high-temperature grease weekly, and replace the screw shaft seals quarterly.
3. Electrical Safety: Regularly test the overload protection function and maintain a flushing water pressure above 0.5 MPa.
5. Technical Advantages Comparison

V. Comparison of technical advantages

Main structures and components:

I. Core Unit Structure
1. Screw Dewatering Machine
Screw Shaft: Surfaced with spiral blades, it penetrates the fixed and movable rings, propelling the sludge forward and applying pressure, achieving continuous dewatering.
Screw Shaft and Looping Ring: Staggered to form a filter chamber, the movable ring rotates in conjunction with the fixed ring to create a dynamic filter gap, preventing clogging.
Filter Cloth: Wraps the screw shaft, separating water through its pores. The material must balance water permeability with sludge retention.
Drive: A motor or reducer is used to control the screw shaft's speed and thrust, tailored to the specific sludge treatment requirements.
2. Belt Filter Press
Filter Belt: Composed of multiple layers of polyester fiber mesh, it carries the sludge and is water-permeable. Regular cleaning and maintenance are required.
Roller Press System: Consists of gravity dewatering rollers, wedge-shaped pre-pressing rollers, and high-pressure pressing rollers, gradually reducing the sludge moisture content through a gradient pressure. Tensioning and Correction Device: Adjusts filter belt tension and corrects deviation to ensure stable operation.
3. Centrifugal Dewatering Machine
Drum: Rotates at high speed (2500-4000 rpm) and separates the solid and liquid phases through centrifugal force.
Screw Conveyor: Operates coaxially with the drum at a differential speed, pushing the dewatered sludge cake to the discharge port.
Differential Speed ​​Control System: Adjusts the speed difference between the drum and screw conveyor to control discharge efficiency.

II. Auxiliary Systems
Pretreatment Unit: Sludge mixing tank and flocculant addition device (such as a static mixer) ensure uniform reaction between sludge and chemical to form flocculants.
Control System: PLC integrated module, variable frequency drive, and automatic correction system enable dynamic parameter adjustment and one-button start and stop.
Flushing System: High-pressure nozzles and a closed water tank for online cleaning of the filter belt (belt-type models) or screw shaft (stacked screw models).

III. Comparison

Features:

1.High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
2.The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
3. It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.

Domestic large-scale coating equipment, intelligent equipment, and environmental protection equipment production enterprises-Zhejiang Huier Coating Environmental Protection Equipment Co., Ltd has 37 years of experience industry team in the powder coating equipment,intelligent equipment and environmental protection equipment.It is the national high and new tech enterprise,Specialized, refined, and innovative small and medium-sized enterprises， scientific and technological SMES 27years specialized R&D, design, manufacture, installation, commissioning ,maintenance of varies coating equipment, automatic equipment, intelligent control system, waste water,waste gas environmental protection equipment and treatment engineering.The company is located in Wukang Street, Deqing County, covers an area of 30,000 square meters, workshop of more than 20,000 square meters, more than 200 employees. The company has passed ISO9001 international system certification, ISO14001 environmental management system certification and ISO45001:2018 Occupational health and safety management system certification, and obtained more than 40 national patents.

The company actively and constantly introduce excellent talents, focus on the development of coating equipment and environmental protection equipment of new technology, new process and new products every year.It is the mission of all staff to continuously develop and grow, meet the needs of customers and create value for customers.

The products are used in all kinds of metal surface, plastic, aerospace, auto parts, mechanical equipment, furniture and other surface treatment.It will meet the customer needs, because it adopts automatic production to anti-corrosion and powder coating the user's products,coating solid bright.

In aerospace, household appliances, light industry, furniture, machine tools, construction, motorcycles, automobiles, communications, aluminum, electric power, agricultural machinery and transportation and other industries by the user's praise. The company continue to innovate, research and development of new products, design and manufacture safety, energy saving, environmental protection, intelligent features of fire-proof safe, powder coating environmental protection equipment and intelligent equipment engineering projects.

The company not only meet the needs of domestic customers, but also in Southeast Asia, the Middle East, Europe, North America, South America and other 27 countries occupied the market has won the favor of customers! The company always dedicated to our customers with the overall intelligent coating environmental protection system solutions and system services.