Aging Siphon Filter Upgraded! Zhongchang Helps Hangzhou Jingshan Water Plant Achieve High-Efficiency Air-Water Backwash Filtration
Company Profile: A Powerful Partnership, Setting a New Benchmark in Water Treatment
With over 40 years of deep expertise in the water treatment sector, Zhongchang Water Treatment Technology Co., Ltd. is driven by a core philosophy of "innovation-driven, technology-leading". Specializing in municipal water and wastewater treatment, industrial water treatment, and refurbishment of aging facilities, the company possesses a range of industry-leading technologies — including siphon filter retrofit solutions — and stands as a leading comprehensive water treatment service provider in China. Leveraging intelligent control systems and modular retrofit solutions, Zhongchang has successfully served over 100 water plant renovation projects nationwide, earning a strong industry reputation for efficiency, energy savings, and reliable performance.
The Jingshan Water Plant, operated by Hangzhou Yuhang Water Holding Group Co., Ltd., is a critical facility ensuring drinking water supply for four townships in western Yuhang District. Originally commissioned in 2000 with a designed capacity of 40,000 m³/day, the plant's conventional siphon filters — relying on single water backwashing — have become increasingly inadequate due to growing regional water demand, compounded by poor backwash effectiveness and low automation. In 2022, the plant launched its Phase I renovation and upgrade project, introducing modern filtration technology.
Retrofit Solution: Technological Innovation Tackling Industry Challenges
Zhongchang developed a tailored "Siphon Filter Air-Water Backwash Retrofit Solution" for the Jingshan Water Plant, featuring the following highlights:
1. Structural Optimization for Enhanced Treatment Capacity
Removed the original filtration system and replaced it with stainless steel filtration components.
Added an air-scour piping system.
Replaced the original water-jet vacuum system with a vacuum pump system.
Post-retrofit treated water turbidity: <0.1 NTU, with stable and reliable system operation.
2. Intelligent Control for Energy Savings
Integrated automated air-water backwash system, with a control system combining vacuum tanks, solenoid valves, and pressure switches linked to a PLC control unit — enabling precise backwash timing and achieving 30% energy savings.
Upgraded central control system with new features including valve simulation and independent valve control, significantly enhancing operational convenience.
3. Environmental & Economic Benefits
Backwash water consumption reduced by 40%; sludge discharge minimized — aligning with green water plant principles.
Retained existing filter basin structure, saving significant civil construction costs, with total project cost reduced by 50% compared to a new facility of similar scale.
Project Outcomes: From "Conventional" to "Smart"
Through Zhongchang's technological expertise, the Jingshan Water Plant has been transformed:
Water Quality Improvement: Treated water turbidity consistently ≤0.1 NTU, meeting national high-quality drinking water standards.
Operational Efficiency: Automation has reduced manual intervention by 80% and lowered failure rates by 60%.
Social Impact: Securing safe water supply for Siling Village and surrounding communities in Yuhang District, contributing to rural revitalization.
A Win-Win Partnership: Technology Empowering a Shared Future
The Jingshan Water Plant retrofit project is not only a testament to Zhongchang's technical capabilities but also a model of both parties' commitment to "technology for the public good". Looking ahead, Zhongchang will continue to drive innovation, facilitating the green and low‑carbon transformation of more water plants, and contributing Zhongchang's expertise to urban and rural water supply security.
About Us
Zhejiang Zhongchang Water Treatment Technology Co., Ltd. is a national high-tech enterprise with business covering filter retrofits, smart water solutions, water supply and wastewater treatment, and more.
Partnering with technology for clean, lasting water — the story of Zhongchang and Jingshan Water Plant continues...
