Water purification experimental project case

This project is located in a freshwater lake in Yueyang City, Hunan Province, surrounded by residential areas and ecological wetlands. Due to long-term sediment accumulation, surface runoff, and direct discharge of sewage during the dry season, the water body has become polluted and malodorous, with increased turbidity and high levels of suspended solids, impacting the aquatic ecosystem and landscape.

To restore the lake's ecological function and improve water quality, the project utilizes silt curtains as a core water treatment and pollution control measure. By effectively isolating the experimental area, the project aims to achieve the treatment objectives of maintaining water flow while preventing the spread of suspended solids.

This project adopts an integrated permeable antifouling curtain system, which is specially designed for the environmental treatment of freshwater lakes. It consists of a floating body, an aging-resistant antifouling curtain, counterweight sandbags, and an anchoring system.Key technical features include:

• Selective Permeability:The silt curtain fabric allows water to pass through freely while preventing suspended solids, fine sediments, and organic particles from crossing the barrier.
• Full-Depth Isolation:The curtain extends from the water surface to the lakebed, ensuring effective containment of pollutants within the treatment zone.
• Stable Anchoring:Anchoring and ballast systems maintain curtain stability under wind, waves, and changing water levels.
• Phased Water Treatment: By isolating high-turbidity areas, targeted dredging and ecological restoration measures were carried out without secondary pollution.

HOKBG® supplied customized freshwater silt curtain systems and provided technical support throughout the project. The supply scope included:

• Aging-resistant, highly permeable, and fine-filtering anti-fouling curtain fabric;
• High-strength pontoons and flotation system;
• Counterweight sandbags and anchoring system;
• Installation guidance and technical support.

All materials were designed to ensure high filtration efficiency, long service life, and environmental compatibility.

The application of HOKBG® silt curtains significantly reduced turbidity and suspended solid diffusion in the lake. Monitoring results showed that:

• Suspended particles were effectively confined outside the experimental area.
• Clean water circulation was maintained outside the curtain;
• No secondary pollution occurred during the water treatment process.

The project successfully demonstrated the “water-permeable, pollutant-blocking” performance of silt curtains and became a benchmark case for lake water governance and ecological restoration in inland China.