Jiuwu's Another Seawater Desalination Case: Nine Dragons Paper (Taicang)

With the accelerated green transformation of industry and the continuous tightening of rigid constraints on water resources, the optimized utilization of water resources in traditional water-intensive manufacturing industries has become a core issue for high-quality industrial development. As a leading enterprise in the field of membrane separation technology in China, Jiuwu Hi-Tech, leveraging its years of technological accumulation in the water treatment field and its full-industry chain solution capabilities, has successfully partnered with Nine Dragons Paper (Taicang) Co., Ltd. to implement a seawater desalination system project. This project uses core membrane technology to break through the water bottleneck in the production of large paper companies, injecting new momentum into the green, low-carbon, and sustainable development of the paper industry.

Rising Seawater Salinity Demands Urgent Breakthrough in Process Technology

Nine Dragons Paper, a leading global paper manufacturer, has a subsidiary, Nine Dragons Paper (Taicang) Co., Ltd., has launched a specialty new material paper project focused on the production of high-end specialty paper. With a production capacity and stringent water quality requirements for its manufacturing processes, the paper industry itself is a major industrial water consumer. During the dry season in the Yangtze River, seawater intrusion is common. As a result, the salt content in the raw water increases significantly, with the water conductivity surging to 6446 μS/cm. This high-salinity and high-conductivity raw water directly disrupts the balance of the papermaking process, severely impacting paper forming and quality stability. This leads to finished paper that fails to meet quality standards and cannot satisfy normal production requirements, making it a critical bottleneck restricting production.

Therefore, a professional team with mature membrane technology and experience in implementing large-scale industrial projects is needed to tailor customized solutions to the paper production scenario. Jiuwu Hi-Tech, with its industry-leading technical strength and rich project cases, has become the core partner of this project.

Jiuwu's Membrane Solutions: A New Practice in Industrial Seawater Desalination

In response to the production water needs of Nine Dragons Paper (Taicang) and the characteristics of coastal seawater quality, Jiuwu Hi-Tech, relying on its independently developed high-performance membrane material core technology, tailored an integrated seawater desalination system. To fundamentally solve this water quality problem, a three-stage deep water treatment process of disc filter + ultrafiltration + reverse osmosis was specifically configured. The disc filter effectively intercepts silt and large particulate impurities, followed by ultrafiltration to remove fine pollutants such as colloids and microorganisms. Finally, reverse osmosis is used to achieve deep desalination and removal of conductive ions. This system purifies and processes water layer by layer with precision, overcoming multiple challenges such as high seawater salinity, complex impurities, and stable operation at high industrial flow rates.

The core membrane element from Jiuwu Hi-Tech used in this project is made of high-quality polymer composite materials, with precise and controllable pore size distribution. They have core advantages such as ultra-high desalination rate, strong pollution resistance, and long service life. It can efficiently remove salt, suspended solids, microorganisms, and impurities from seawater. The produced water quality fully meets and exceeds the standards for water used in the paper industry, perfectly adapting to the refined water requirements of specialty paper production. After the system was put into operation, it operated stably, with the final product water conductivity consistently controlled below 500 μS/cm. All water quality indicators fully meet the stringent requirements of paper production, effectively ensuring continuous and stable production, significantly improving the finished paper yield, and providing a solid water quality guarantee for improving production quality and efficiency.

As a single champion enterprise in the domestic ceramic membrane industry, Jiuwu Hi-Tech has long established a complete industrial chain system encompassing "membrane material R&D, membrane element production, system integration, and engineering services". It has not only broken through many core technology bottlenecks in membrane materials and achieved domestic substitution of high-end membrane elements, but also accumulated a large number of successful cases in various fields such as seawater desalination, zero discharge of industrial wastewater, and municipal water treatment. The seawater desalination system designed for Nine Dragons Paper is another classic example of the company's membrane technology in large-scale industrial water projects in the paper industry.

Project Delivers Results, Setting a New Benchmark for Water Savings in the Paper Industry

The successful implementation of the seawater desalination system at Nine Dragons Paper (Taicang) not only completely resolved the company's resource bottleneck for production water and ensured the stable production capacity of its specialty paper project, but also promoted the company's green upgrade in water resource utilization. Through seawater desalination technology, abundant seawater resources are converted into qualified industrial production water, significantly reducing the company's dependence on surface freshwater and groundwater resources, effectively reducing water consumption and carbon emissions, perfectly aligning with the national "Dual-Carbon" strategy and the policy orientation of industrial water conservation and energy saving.

This collaboration represents a powerful alliance between a leading paper manufacturer and a membrane technology leader. It demonstrates Nine Dragons Paper's commitment to green development and its responsibility in driving industrial transformation and upgrading, while also showcasing the maturity and adaptability of Jiuwu Hi-Tech's membrane technology in the field of industrial seawater desalination. Compared to traditional water supply methods, this seawater desalination system achieves efficient and cyclical utilization of water resources, providing a replicable and scalable model for optimized water resource utilization for high water-consuming industrial enterprises in the Yangtze River Delta region and even along the coast of China.