HBIS Tangsteel High Strength Auto Steel Cold Rolling Mill has completed the recovery of cold rolling Alkaline waste water, a successful demonstration of independently developed Low Carbon and Low Cost Cold Rolling Alkaline Waste Water Treatment Technology and Applications. For the first time in industry, the company promotes the low carbon concept in treatment of cold rolling waste water and develops biological & chemical systems and single tank intermittence operation and reduces the alkaline sludge output.

Waste water treatment is key to reduce carbon emission and energy consumption. The lowering costs also could help the enterprises to improve the profit level. Thus, waste water treatment technologies could bring very good social and economic values.

Tangsteel experts led the teams and studied the process mechanism of reducing carbon emission and operating cost in the process of cold rolling alkali-containing wastewater treatment, and the low carbon and low cost operating technology route was established. Technology research and development is carried out from four dimensions: reducing power consumption, reducing pharmaceutical consumption, reducing sludge production and realizing the reuse of cold rolling alkali-containing wastewater. In the study of the extremely difficult cold rolling wastewater treatment process, upholding the concept of green development, reducing carbon emissions of the cold rolling alkali-containing wastewater treatment system is proposed in first time, ensuring that the alkali-containing wastewater is discharged to the standard for reuse, and achieving low cost and high efficiency operation, walking in the forefront of the national water environment and environmental protection management. Leading in the industry, the new system uses single tank and intermittence operation technology to reduce the consumption of chemicals and Nutrient salts and reduce the output of sludge by 19%, reducing the carbon emission of 100tons. The project optimizes Ammonia nitrogen consumption and adopts secondary reverse osmosis procedures to fully recover the alkaline waste water, saving 610,000tons of fresh water every year.