Fluorescent Brightener Wastewater Treatment
2026-06-17
Project Overview:
This project undertakes process‑upgrade validation to address the treatment bottlenecks of fluorescent whitening agent production wastewater from a chemical plant in Shandong. The wastewater contains high concentrations of recalcitrant compounds such as aniline, DSD acid, and finished fluorescent whitening agents, along with elevated chloride ion levels, rendering it particularly challenging to treat. Currently, both domestically and internationally, research on the treatment of similar wastewaters is limited, and existing processes generally deliver suboptimal performance, with effluent quality frequently failing to meet regulatory standards. Consequently, advancing the technological capabilities for treating this type of wastewater holds significant engineering relevance.
Project Conclusion:
After biochemical treatment, the plant’s wastewater meets discharge standards for total nitrogen and ammonia‑nitrogen; however, its COD concentration remains at 91.05 mg/L, significantly exceeding the permissible limit. The client had previously commissioned universities and research institutes to conduct pilot tests using various technologies—such as aeration discs combined with ozone, jet aerators paired with ozone, and electrochemical processes—but none achieved compliance within the approved budget. Ultimately, an experimental study was undertaken employing an advanced coupled process that integrates ozone with ultrafine and nano‑scale bubbles.
Experimental results demonstrate that this process can reduce the COD of wastewater to 35 mg/L, achieving compliance with discharge standards, with a removal efficiency of 61.98%. The O:C ratio is 1:4.6, enabling customers to cut treatment costs by more than 50%. The ultramicro‑nanobubble device rapidly increases dissolved gas levels in water and enhances ozone utilization efficiency, making it highly compatible with ozone oxidation. By reducing operational losses, it delivers dual cost reductions—both in capital investment and operating expenses.
(Comparison of wastewater colority at different times)
(COD concentrations and removal rates at different treatment durations)
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