Lithium Battery / COD Removal from High-Salinity Wastewater
2026-06-17
Project Overview:
This project addresses the pain points in treating high-salinity lithium‑battery wastewater at a new‑energy company in southern China by upgrading the treatment process. The raw wastewater has a COD concentration exceeding 5,000 mg/L. The existing process employs a treatment scheme that combines a catalyst with ozone injection via aeration diffusers; however, it suffers from high operating costs, low ozone utilization, and rapid caking of the catalyst, making it ill‑suited to meet the demands of treating highly concentrated saline wastewater.
Project Conclusion:
This upgrade introduces an advanced dissolved-gas system based on ultrafine and nano-scale bubbles, coupled with an ozone‑based treatment process. Leveraging the exceptional gas‑solubilization capabilities of these microbubbles, the system enhances the efficiency of ozone oxidation, enabling the effective degradation of COD, color, and other pollutants in wastewater, as well as the breakdown of high‑molecular‑weight organic compounds, thereby achieving the root‑cause removal of contaminants.
Experimental results show that, after treatment with this process, the wastewater COD was reduced to 421.4 mg/L, achieving a removal rate of 65.0%. The ultramicro‑nanobubble generation device can rapidly increase the ozone concentration in water, significantly enhancing ozone utilization efficiency, and is highly compatible with the ozone oxidation requirements of lithium‑battery wastewater treatment, demonstrating strong potential for engineering applications.
(Comparison of wastewater colority at different times)
(COD concentrations and removal rates at different treatment durations)
(Detailed data on wastewater treatment at different time points)
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