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Filter cloth for wastewater treatment plants, belt press filter, municipal wastewater treatment and domestic sludge
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Detailed Description
- Wastewater treatment plant filter cloth, belt press filter, municipal wastewater treatment sludge
Filter type: Belt press filter
Application industry: Municipal wastewater
Material description: Sewage sludge
Filter cloth model: 005，055R03，002A
Application research of wastewater treatment plant filter cloth in belt press filter for municipal sewage sludge treatment
I. Introduction
With the continuous acceleration of urbanization in China, the wastewater treatment capacity of cities has been significantly improved, and the resulting sludge production has also been continuously increasing. The sludge produced during the process of domestic wastewater treatment is characterized by high water content, high organic matter content, and high treatment difficulty. If it is not handled properly and promptly, it is very likely to cause secondary pollution. In order to reduce the cost of subsequent disposal and improve resource utilization efficiency, sludge dewatering has become a key link in the operation of wastewater treatment plants.
Currently, belt press filter With its advantages of strong processing capacity, stable continuous operation, and low energy consumption, it is widely used in the sludge treatment process of municipal wastewater treatment plants. The filter cloth used in it, as a core component that affects dewatering performance and equipment efficiency, its performance and selection play a decisive role in the operation effect of the entire sludge treatment system.
II. Characteristics and treatment needs of municipal sewage sludge
Municipal sewage sludge mainly comes from primary sedimentation tanks, biological treatment units, secondary sedimentation tanks, etc., and its characteristics are as follows:
- High water content ：The water content of raw sludge is generally 95%-98% ，needs to be reduced to 60% below through mechanical dewatering;
- High organic matter content ：Contains a large amount of microbial residues and organic pollutants, easy to decay and produce odor;
- Loose particle structure ：High proportion of bound water between particles, making dewatering difficult;
- Strong fluidity ：Untreated sludge is difficult to form a filter cake.
Therefore, the dewatering equipment must have good pressing ability, and the filter cloth needs to take into account permeability, strength, corrosion resistance, and good mud cake stripping performance.
III. Working principle and process characteristics of belt press filter
The belt press filter is a continuously operating sludge mechanical dewatering equipment, and the work process is mainly divided into three stages:
- Gravity dewatering section ：During the conveying process of sludge on the filter cloth, part of the free water is removed under the action of self-weight;
- Wedge pressing section ：The sludge is gradually squeezed into a thin layer, and the initial mud cake structure begins to form;
- High-pressure pressing section ：Through repeated pressing by multiple pressing rollers, the sludge is further dewatered to form a mud cake with a lower water content.
In this process, the filter cloth always serves as the carrier and filtration medium of the sludge, and is in a continuous operation, high-intensity pressing and water flow washing working state, which puts extremely high demands on its material, structure and processing technology.
IV. Performance requirements of wastewater treatment plant filter cloth
For the application of belt press filter in municipal sludge treatment, the filter cloth needs to meet the following technical performance:
（ 1 ）High permeability and filtration accuracy coexist
The filter cloth must have excellent water permeability while ensuring sufficient retention of sludge particles, so as to improve processing efficiency and reduce filter liquid backflow and sludge leakage.
（ 2 ）Excellent tensile strength and dimensional stability
During the operation of the equipment, the filter cloth needs to withstand high-intensity tension and frequent bending for a long time, and must have good mechanical strength and fatigue resistance to avoid breakage and deformation.
（ 3 ）Good mud cake stripping performance
The smooth surface and reasonable structure of the filter cloth help the mud cake to naturally fall off after pressing, reduce adhesion, and improve operating efficiency.
（ 4 ）Chemical corrosion resistance and temperature resistance
Sludge often contains acids, alkalis, salts and various organic substances, and the filter cloth needs to have strong chemical stability and adapt to different temperature operating conditions.
（ 5 ）Easy cleaning and regeneration performance
The filter cloth should have good pollution resistance and regeneration ability for easy maintenance and long-term use.
V. Xiamen Citius (Xiamen Citius) Application advantages of wastewater treatment filter cloth
As a national high-tech enterprise in the filtration materials industry, Xiamen Citius (Xiamen Citius) Filtration Materials Technology Co., Ltd. has long been committed to the research and development and manufacturing of industrial filter cloths. For municipal wastewater treatment conditions, it has launched a number of wastewater treatment plant belt press filter cloths ，widely used in domestic and foreign municipal sludge dewatering projects.
Its main advantages are as follows:
- Material structure optimization ：Using high-strength polyester monofilament or double-filament weaving to enhance water permeability and wear resistance;
- Multi-layer composite design Inner layer filtration, outer layer support, balancing efficiency and durability;
- Advanced surface treatment technology Special coating and smooth processing significantly improve the mud cake peel-off performance;
- Customizable service According to different equipment models and sludge properties, personalized processing services such as filter cloth punching, edging, and guide belts are provided;
- Long operating cycle, low comprehensive cost The filter cloth replacement cycle is as long as 6-12 months, reducing the frequency of shutdown maintenance.
VI. Typical Application Cases
A municipal wastewater treatment plant in a provincial capital city, with a daily processing capacity of 15 ten thousand tons, originally used imported filter cloth with belt press filter, but there were problems such as high water content of mud cake, short filter cloth life, and high operating costs. After changing to Xiamen Xiadias (Xiamen Citius) The system operating effect has been greatly improved after using the special filter cloth:
- Mud cake moisture content from the original 80% decreased to 73% or so;
- Processing capacity increased by 15% above ；
- Filter cloth replacement cycle from 3 months extended to 9 months ；
- The filter cloth operation stability is enhanced, and there are basically no problems such as broken belts and deviations. 。
The person in charge of the plant said that after the filter cloth was replaced, not only the dewatering efficiency was improved, but also the equipment operation was more stable, and the maintenance workload was significantly reduced.
VII. Conclusion
In the process of municipal wastewater treatment and dewatering of domestic sludge, filter cloth, as the core consumable of belt press filter, its performance is directly related to the quality and cost control of sludge treatment. High-performance filter cloth for wastewater treatment plants can effectively improve dewatering efficiency, extend equipment life, and reduce operating and maintenance costs. Xiamen Xiadias (Xiamen Citius) With its industry-leading technology accumulation and engineering experience, it has become a trusted filtration solution provider for the municipal wastewater treatment industry. In the future, with the continuous improvement of environmental protection standards, higher requirements will be put forward for the performance and application of filter cloth. Xiadias (Xiamen Citius) will continue to be driven by innovation and inject continuous momentum into the sludge treatment industry.
We sincerely looking forward to cooperating with you !
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