Protect people and the planet
Leading water stewardship
Water Optimization in High Stress River Basins
Our Zhangjiagang site in China operates in a high-risk water basin. In order to fulfill our DuPont water stewardship goals and support government efforts to protect water availability and quality, Zhangjiagang set a sustainability goal for the site to reduce wastewater generation, optimize on site wastewater treatment processes, and re-use concentrated city water.
This background photo highlights the Friendship Garden at the DuPont Zhangjiagang site.
Our first project was to reduce our consumption of city water by treating and recycling wastewater from our production process, such as water used for rinsing some equipment.
The second project is to optimize multi-stage Fenton reaction decomposition process, to treat higher chemical oxygen demand (COD) wastewater. Previously, higher chemical oxygen demand (COD) wastewater needed to be disposed off-site as hazardous waste.
We completed the rebuild project in 2020. Now, we treat all wastewater produced on site with a chemical oxygen demand (COD) under 10,000 mg/L with our own system, decreasing stress on hazardous waste treatment of society.
After a year of operation, we have decreased our consumption of city-provided water by 10% and decreased higher chemical oxygen demand (COD) wastewater disposal by over 30 tons annually.
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