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Industrial filter cloth, industrial filter mesh, belt press filter, municipal sewage treatment plant for domestic sewage sludge
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Detailed Description
- Industrial filter cloth, industrial filter mesh, belt press filter, municipal sewage treatment plant for treating domestic sewage sludge
Filter type: Belt press filter
Application industry: Municipal sewage
Material description: Domestic sewage sludge
Filter cloth model: 006，032-8*8
Application of industrial filter cloth and filter mesh in belt press filter: Improve the dewatering efficiency of domestic sewage sludge in municipal sewage treatment plants
With the continuous advancement of urbanization, the construction and operation of municipal sewage treatment plants have become an important part of the urban public service system. However, the large amount of domestic sewage sludge produced during sewage treatment will directly affect environmental safety and resource reuse if not properly handled.
In the sludge treatment process, belt press filter as a highly efficient solid-liquid separation equipment, has been widely used in municipal sewage treatment plants. Its core components —— industrial filter cloth and industrial filter mesh directly determine the sludge dewatering efficiency, filter cake moisture content, equipment operation stability, and maintenance costs.
This article will systematically introduce the application characteristics of industrial filter cloth in belt press filters, combined with the typical process of municipal domestic sewage sludge treatment, analyze the selection points, technical advantages, and future development trends.
I. Basic process of domestic sewage sludge treatment in municipal sewage treatment plants
After municipal sewage is treated through primary sedimentation, biological reaction, secondary sedimentation tanks, etc., a large amount of excess activated sludge will be formed. These sludge have high water content, large volume, and carry organic matter and microorganisms, and must be treated by mechanical dewatering to reduce volume, facilitate transportation, or further processing (such as drying, incineration, composting, etc.).
Currently, the more mature sludge dewatering methods include:
- Centrifugal dewatering;
- Plate and frame filter press;
- Belt press filter dewatering (especially widely used in large and medium-sized sewage treatment plants);
- Screw press dewatering, etc.
Among them, belt press filters occupy an important position in the field of domestic sewage sludge treatment due to their continuous operation, low energy consumption, simple structure, and moderate investment cost etc.
II. Analysis of the role of industrial filter cloth in belt press filters
Belt press filters mainly use two filter cloths to clamp the sludge, and complete the solid-liquid separation process in the gravity dewatering zone, wedge-shaped pressing zone, and multi-roller pressing zone. The main functions of the filter cloth include:
- Supporting and separating medium : The filter cloth must be able to withstand high tensile strength and have good solid-liquid retention capacity;
- Liquid guiding function : Quickly drain the filtrate to prevent back-permeation and filter cake soaking;
- Separation and self-cleaning : Ensure that the filter cake is completely removed and does not cause scaling on the cloth surface;
- Corrosion resistance and long life : Sludge contains ammonia, sulfur, phosphorus, and lipids, which have strong corrosive effects on filter cloth materials.
The quality of the filter cloth directly determines:
- Whether the filter cake moisture content can be reduced to 60% or below;
- Whether it is easy to clean and reduce equipment downtime;
- The service life of the filter cloth, whether it saves maintenance and replacement costs;
- Whether the filter cloth tension and deviation control are stable.
III. Main challenges and solutions for filter cloth application in sewage treatment plants
1. Sludge is viscous, fine particles, easy to block filter cloth pores
Solution:
Use high-density woven single-filament or double-layer composite filter cloth with a flat surface, strong retention capacity, and easy filtrate flow; and use a high-pressure water washing system to keep the surface clean.
2. Sludge contains a lot of oil or organic matter, affecting the breathability and separation of the filter cloth
Solution:
Select oil-resistant and high-surface smoothness polyester monofilament filter cloth to enhance anti-blocking and improve separation, making the filter cake easier to fall off.
3. Frequent use of filter cloth, fast wear and tear, easy to deviate
Solution:
Adopt wear-resistant and tensile structure design, such as edge reinforcement, edge heat sealing; matching self-aligning filter belt system; using special thickened industrial filter mesh base cloth to improve overall tension and compressive strength.
Case recommendation: Xiamen Xiadias provides customized sewage treatment filter cloth services. Its developed sludge-specific composite filter cloth has good wear resistance, fast liquid guiding channels, and excellent filter cake separation effect, and is often used in urban sewage treatment plants with a daily processing capacity exceeding 10,000 tons.
IV. Operation and maintenance points of filter cloth
- Regularly high-pressure wash the filter cloth surface to maintain permeability and prevent clogging;
- Keep the filter cloth tension moderate too tight is easy to break, too loose affects the pressing effect;
- Set a reasonable deviation control program to prevent the filter cloth from deviating or being drawn into the roller;
- Conditioning sludge with agents (e.g., flocculants) to improve the mud-water separation effect and reduce the burden on the filter cloth;
- Reasonably set the filter cloth service life and replacement plan determined by operating hours and filter cake quality;
V. Environmental Protection and Policy Trends Drive Filter Cloth Technology Upgrades
With the “ dual carbon ” goals and the continuous advancement of sludge reduction policies, the role of industrial filter cloth is no longer merely a “ dewatering tool ” but a key support for system energy saving, consumption reduction, and resource utilization. In the future, filter cloths will continue to be optimized in the following directions:
- Application of new environmentally friendly materials such as PTFE modified fibers, bio-based polyester, etc.;
- Smart filter cloth monitoring system integrating pressure, temperature, and tension monitoring sensors;
- Long life and low energy consumption design reducing overall operating costs, adapting to the sewage treatment plant's “ unmanned operation ” trend;
- Recyclable and regenerative filter cloth promoting green closed-loop management of industrial filter cloths;
Conclusion: Industrial Filter Cloth Empowers Efficient Municipal Sludge Management
The efficient operation of urban wastewater treatment systems is inseparable from the synergistic optimization of every technical link. As one of the core consumables of belt press filters, industrial filter cloths and filter screens not only undertake the basic task of solid-liquid separation but also carry the strategic mission of energy saving, emission reduction, and sustainability;
Xiamen Xiadiaisi Filtration Material Technology Co., Ltd., relying on thirty years of experience in filter cloth R&D and manufacturing, has provided filter cloth products and filtration system solutions for hundreds of sewage treatment plants across the country, contributing to the upgrade of China's environmental protection industry and the construction of green cities.
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