Discover how one municipal sewage treatment facility faced with belt filter cloth that needed replacement every 50 days tackled quality challenges and cut material consumption—unlocking smarter, longer‑lasting performance.
The Filter Cloth Challenge in Municipal Sewage Treatment.
With stricter environmental regulations and the growing scale of sludge treatment, the municipal sewage industry increasingly demands dewatering technologies that are efficient, stable, and cost-effective. As a critical part of sludge reduction and resource recovery, the performance of the filter cloth—the core component of high-pressure belt dewatering—directly impacts dewatering efficiency, energy consumption in the subsequent drying process, and overall plant operation and maintenance costs.
At Changshan Sludge Treatment Center, operated by Changsha Xiangjiang Environmental Technology Co., Ltd., an average of 540 tons of sludge is treated daily. The center employs a “high-pressure belt dewatering + heat pump low-temperature drying” process, recognized for its high efficiency and low operating costs. Yet, the high-pressure belt dewatering stage continues to face persistent challenges, with the original filter cloth presenting three key issues that limit overall performance.
- Rapid Decline in Water Permeability: The filter cloth’s permeability drops sharply after high-pressure extrusion, slowing down the dewatering process.
- Inefficient Solids Removal: High sludge residue, frequent shutdowns, and constant cleaning disrupt continuous operation.
- Short Lifespan and High Costs: Limited wear resistance leads to an average service life of just 50 days, increasing O&M expenses and impacting production continuity.
Solution: Tailored longevity improvements and precise performance optimization.
To address these key challenges, and with a thorough understanding of municipal sludge’s characteristics—high viscosity, high oil content, complex composition, and tendency to clog—Yanpai applied its service philosophy of “segmenting the sewage field and deeply addressing process needs.” For the Changshan Sludge Treatment Center project, through material innovation and process enhancement, we developed customized filter cloth solutions for the high-pressure belt dehydrator. By carefully differentiating the functional requirements and operating conditions of the upper and lower belts, two specialized filter cloth models were created:
Upper Belt Machine Filter Cloth (YP604): Designed for High Pressure Resistance & Stable Water Permeability
Constructed from high-strength, low-elongation polyester fibers and woven with satin technology, this filter cloth enhances fiber alignment and shape stability under high pressure. Even under continuous high-pressure operation, water permeability stays above 85% of the initial level, effectively reducing the dehydration time per batch and ensuring consistent treatment efficiency.
Lower Belt Machine Filter Cloth (YP613): Engineered for Superior Solids Removal & Low Residue
Featuring an innovative three-dimensional weave as its base, treated with a specialized surface coating and enhanced by a herringbone crochet design, this filter cloth minimizes sludge adhesion. The combination of these process innovations significantly lowers sludge residue, reduces cleaning frequency, and ensures continuous, stable operation of the production line.
Proprietary High-Performance Materials: Building a Long-Term Cost-Saving Foundation
Both filter cloths are crafted from polyester monofilament materials independently developed by Yanpai Co., Ltd., offering exceptional wear resistance. Their average service life has increased from 50 to 60 days—a 20% improvement—significantly reducing replacement frequency and lowering overall operation and maintenance costs for the center.
Renewed Filter Cloth Delivers Triple Efficiency Gains
- Higher Filtration Efficiency: Stable water permeability accelerates dewatering, shortening the cycle per batch and reliably supporting the daily treatment of 540 tons of sludge.
- Lower Sludge Moisture: Post-dewatering moisture content drops from 83% to 78%, improving sludge dryness and reducing energy consumption in the subsequent drying process.
- Overall O&M Cost Savings: Filter cloth lifespan increases by 20%, cleaning frequency decreases, and annual operation and maintenance costs are cut by over 10%, while minimizing downtime and enhancing production continuity.
Service Guarantee: One-Stop, Worry-Free Operation and Maintenance
Yanpai not only delivers high-performance, customized filter cloth products but also offers a comprehensive after-sales service system:
- Professional technical consultation
- Rapid response support
- Reliable supply chain assurance
- Continuous product performance tracking
This ensures customers enjoy a seamless experience—from technical guidance to long-term stable operation—achieving truly “worry-free operation and maintenance.”
The successful collaboration with Changshan Sludge Treatment Center demonstrates Yanpai’s commitment to enhancing the efficiency of environmental protection equipment through technological innovation. By providing tailored solutions, Yanpai addressed the core challenges of municipal sludge in high-pressure dewatering, helping the center maintain high dewatering efficiency, low operating costs, and minimal environmental risk, while supporting full resource utilization of sludge.
Looking ahead, Yanpai will continue targeting the industry’s key pain points, delivering precise and efficient filter material solutions through the dual engine of innovative technology + professional service. Together with partners across the sector, Yanpai Co., Ltd. aims to drive efficient, green, and sustainable growth in environmental protection, building a cleaner, brighter future.