DOI: 10.11648/j.ajwse.20261203.11 ISSN: 2575-1875

Case Study on the Treatment and Reuse of Eiderdown Processing Wastewater Using a Combined Air Floatation-Biological-Chemical Process

Xiaoling Fan, Chaoyang Xing, Yuxin Chen, Dengjun Ma, Ying Zhu, Zhiyong Zheng
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Eiderdown, as a high-quality natural insulating material, is widely used in everyday life to make down products, and there is a huge market demand for them. However, the wastewater generated during the processing of eiderdown is characterized by a high concentration of fine down fibers and elevated phosphorus levels. Given the characteristics of the wastewater, this project employs a “bar screen + air flotation” pretreatment process to remove residual fibers and ensure the proper operation of subsequent treatment processes, followed by “Anaerobic-Anoxic-Oxic (A 2 /O) + chemical phosphorus removal” to achieve nitrogen and phosphorus removal. Operational results show that the influent water quality is chemical oxygen demand (COD Cr ) ≤ 150 mg/L, suspended solids (SS) ≤ 500 mg/L, total nitrogen (TN) ≤ 30 mg/L, and total phosphorus (TP) ≤ 120 mg/L, while the final effluent water quality is COD Cr ≤ 55 mg/L, SS ≤ 60 mg/L, TN ≤ 15 mg/L, and TP ≤ 0.5 mg/L, consistently meeting the Class I standards of “Integrated Wastewater Discharge Standard” (GB 8978-1996). The actual operating cost is 0.67 yuan per cubic meter. More than 95% of the treated water can be reused in the plant’s primary washing section and other processes, enabling the recycling of water resources and demonstrating significant economic viability. This process provides valuable insights for wastewater treatment in related industries.

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