1. Filter press filter cloth, plate and frame filter press, wastewater treatment in the dyeing industry
   Filter press type: Plate and frame filter press
   Application industry: Dyeing
   Material description: Dyeing wastewater

Application of filter press filter cloth in wastewater treatment in the dyeing industry

—— A highly efficient solution based on plate and frame filter press

Against the backdrop of the global industry's continuous move towards green and low-carbon development, the dyeing industry, as a traditional high-pollution industry, its wastewater treatment has become the top priority for energy saving, emission reduction and compliant operation. Dyeing wastewater has complex water quality and contains a large amount of pigments, surfactants, auxiliaries, heavy metals and high COD (Chemical Oxygen Demand) pollutants. Direct discharge not only causes serious damage to the environment, but also restricts the sustainable development of enterprises. Therefore, establishing a highly efficient, stable and economical wastewater treatment system has become the key to enterprise environmental management.

In the entire dyeing wastewater treatment process, “ solid-liquid separation ” link is particularly important. As the main equipment for sludge dewatering, plate and frame filter press With its advantages of good dewatering effect, stable operation, and simple operation, it is widely used in dyeing wastewater treatment projects. The key consumable that supports its core function —— filter press filter cloth directly affects the system's operating efficiency, processing cost, and sludge disposal quality.

I. Characteristics and treatment challenges of wastewater in the dyeing industry

Dyeing wastewater mainly comes from sizing, dyeing, soaping, and washing processes. Its characteristics can be summarized as follows:

• Complex types of pollutants : Including dyes, surfactants, auxiliaries, suspended solids, heavy metal ions, etc.;
• High chroma : Often contains active, reductive, and dispersive dyes that are difficult to degrade;
• COD/BOD High value : Heavy organic load, requiring multi-stage treatment to meet standards;
• pH Large fluctuations : Widely varying from acidic to alkaline ranges;
• High salt content : Such as NaCl 、 Na ₂ SO ₄ 、 NaOH and other auxiliary residues;

After multi-stage biological + coagulation treatment process, a large amount of sludge formed in the wastewater needs to be efficiently dewatered. This link not only determines the subsequent sludge transportation and disposal costs, but also affects the stable operation of the entire treatment system.

II. The role of plate and frame filter press in dyeing sludge treatment

A plate and frame filter press is an intermittent pressure filtration equipment, composed of alternately arranged filter plates and filter frames. The water in the mixture is squeezed out by pressure to form a solid “ filter cake ”。

Its main advantages include:

• High solid content of filter cake, up to 35% above;
• Simple structure, suitable for high-viscosity sludge;
• Easy to maintain, adaptable to various filter cloths;
• Low energy consumption, suitable for long-term operation.

In dyeing wastewater treatment, plate and frame filter presses are mainly used for dewatering the remaining sludge formed after biological pools or coagulation sedimentation. Because dyeing sludge often contains a large amount of fine pigment particles and auxiliary residues, it puts higher requirements on the anti-blocking and chemical resistance of the filter cloth.

III. The key role of filter cloth in the plate and frame filtration process

As the core medium in the plate and frame filter press, the filter cloth is responsible for supporting filtration pressure, intercepting solid particles, forming filter cakes, and discharging filtrate and other multiple functions. In the filtration cycle, the performance of the filter cloth directly affects the following aspects:

1. Filtration speed and cycle time
   Highly water-permeable but not easily blocked filter cloths can shorten the dewatering time and improve equipment utilization.
2. Filter cake dryness and peelability
   Reasonable pore size and surface treatment can help form a dense filter cake, and it is easy to automatically fall off, reducing manual intervention.
3. Corrosion resistance and service life
   In the face of alkaline substances and oxidant residues in dyeing sludge, high-quality filter cloths need to have good chemical stability.
4. Cleaning and regeneration ability
   Filter cloths with good regeneration performance can significantly reduce operating costs.

IV. Xiamen Citius (Xiamen Citius) Filter cloth product solutions

Xiamen Citius (Xiamen Citius) Filter Materials Technology Co., Ltd. has been deeply involved in the field of filter materials for many years and is one of the important participants in China's filter press system solutions. Targeting the sludge characteristics and filtration needs of the dyeing industry, Xiamen Citius 30 has specially developed a series of filter cloth products suitable for plate and frame filter presses, with the following significant advantages: (Xiamen Citius) 专门开发出适配板框压滤机的过滤布系列产品，具有以下显著优势：

1.  Stable material, strong chemical resistance

Xiadias (Xiamen Citius) Using high-temperature setting, alkali-resistant reinforced polymer fibers, specially designed for the complex environment of dyeing and finishing sludge, effectively resisting NaOH corrosion from substances such as sodium hypochlorite.

2.  Optimized structure, strong water permeability

Through unique weaving structure design and surface heat setting treatment, a good balance between high water permeability and anti-clogging performance is achieved, ensuring stable filtration rate and high circulation efficiency.

3.  Excellent filter cake release

The filter cloth surface is specially treated to reduce particle adhesion, effectively improving filter cake release efficiency and extending the cleaning cycle.

4.  Full process support, flexible customization service

Xiadias (Xiamen Citius) Provides a full set of customized processing, including edging, cutting, leak-proof strips, punching, and guide line sewing, suitable for various plate and frame machine models at home and abroad. Professional teams can customize the pore size, thickness, and support layer structure according to the on-site conditions to optimize filtration performance.

V. Typical Application Cases

Mud dewatering system renovation project of a large dyeing and finishing enterprise:

• Background The original system used traditional general-purpose polyester filter cloths, which had problems such as long filtration cycles, high filter cake moisture content, and short filter cloth service life;
• Improvement Measures Replaced with Xiadias (Xiamen Citius) High-permeability, low-clogging filter cloth, customized edging and punching process, adapted to existing plate and frame filter presses;
• Effect ：
  • Single filtration cycle shortened 15%；
  • Filter cake moisture content from the original 78% decreased to 70%；
  • Filter cloth service life extended by nearly 1 times;
  • Filter cake release significantly improved, equipment shutdown cleaning frequency reduced 30%。

This case fully demonstrates the important role of high-quality filter cloths in improving dewatering efficiency and reducing operating costs.

VI. Future Trends: Emphasis on Green Treatment and Recycling

With the improvement of environmental protection standards and the promotion of resource utilization, the treatment of dyeing wastewater is changing from “ end-of-pipe treatment ” to “ full process optimization ” transformation. The combination of plate and frame filter presses and high-performance filter cloths will continue to play a key role in the following aspects:

• Improve sludge drying rate, reduce transportation costs and landfill pressure ；
• Increase the recovery rate of dyes and auxiliaries, promote resource reuse ；
• Help achieve “ zero liquid discharge ” （ ZLD ）system construction goals ；
• Adapt to new generation intelligent filter presses, support remote monitoring and automatic control 。

Xiamen Citius (Xiamen Citius) We will continue to rely on material research and development capabilities and process innovation capabilities to serve the green development of the global dyeing and finishing industry and promote technological upgrades in the field of industrial solid-liquid separation.

Conclusion

The essential challenge of wastewater treatment in the dyeing and finishing industry lies in how to achieve resource separation and pollution control in an efficient, stable, and environmentally friendly manner. As a core consumable in the filter press system, filter cloth is more than just a piece of cloth, it is a technology carrier . Choosing the right filter cloth not only improves the efficiency of the filter press, but also lays a solid foundation for the success of the entire dyeing wastewater treatment project. Xiadias (Xiamen Citius) is willing to be a reliable partner for dyeing and finishing enterprises on the road to sustainable development with professionalism and craftsmanship.

📞 For technical support or sample testing services, please contact Xiamen Xiadias (Xiamen Citius) ：

• Email: wyl@citius-filter.com
• WhatsApp: +86-13950107241
• Official Website : www.citius-filter.com