工业水处理 ›› 2025, Vol. 45 ›› Issue (9): 56-63. doi: 10.19965/j.cnki.iwt.2024-0679

• 试验研究 • 上一篇    下一篇

混凝+电催化氧化工艺预处理种衣剂废水

范云双(), 吴秀翠, 李家鑫, 杨蕊, 王杰   

  1. 天津工业大学环境科学与工程学院,天津 300387
  • 收稿日期:2024-12-20 出版日期:2025-09-20 发布日期:2025-11-20
  • 作者简介:

    范云双(1971— ),博士,副研究员,E-mail:

  • 基金资助:
    国家自然科学基金项目(22376158)

Pretreatment of seed coating agent wastewater by coagulation+ electrocatalytic oxidation process

Yunshuang FAN(), Xiucui WU, Jiaxin LI, Rui YANG, Jie WANG   

  1. School of Environmental Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2024-12-20 Online:2025-09-20 Published:2025-11-20

摘要:

针对种衣剂废水有机物浓度高、成分复杂、毒性强、可生化性差等难题,采用混凝+电催化氧化组合工艺进行预处理,旨在降低废水毒性并提升其可生化性。首先,优化了混凝工艺条件,确定在废水初始pH=8、聚合氯化铝(PAC)和聚丙烯酰胺(PAM)投加量分别为2.5 g/L和2.0 mg/L时,混凝效果最佳,废水透光率和DOC去除率分别达到88.4%和54.5%,B/C提升至0.28。随后,系统考察了电催化氧化工艺的关键参数,在将混凝出水稀释5倍,以0.04 mol/L Na2SO4作为支持电解质,电流密度为10 mA/cm²,废水初始pH=8,反应时间为120 min的最佳条件下,电催化氧化工艺对特征污染物克百威和呋喃酚的去除率分别达到92.0%和99.2%,COD去除率为63%,同时B/C显著提升至0.53。混凝+电催化氧化组合工艺显著改善了种衣剂废水的可生化性,为后续生化处理工艺的高效稳定运行创造了良好条件。

关键词: 电催化氧化, 混凝, 种衣剂废水, 克百威

Abstract:

To address the challenges of high organic concentration, complex composition, high toxicity and poor biochemistry of the seed coating agent wastewater, a combined pretreatment process of coagulation coupled with electrocatalytic oxidation was employed to reduce wastewater toxicity and improve biodegradability. Firstly, the coagulation process was optimized, and the optimal coagulation effect was achieved when the initial pH of the wastewater was 8, and the dosages of polyaluminum chloride(PAC) and polyacrylamide(PAM) were 2.5 g/L and 2.0 mg/L, respectively. The wastewater transmittance and DOC removal rate reached 88.4% and 54.5%, respectively, and the B/C ratio was increased to 0.28. Subsequently, the key parameters of the electrocatalytic oxidation process were investigated. Under the optimal conditions of dilution ratio of coagulation effluent of 5, Na2SO4 supporting electrolyte concentration of 0.04 mol/L, current density of 10 mA/cm², initial pH of 8, and reaction time of 120 min, the electrocatalytic oxidation process achieved removal rates of 92.0% and 99.2% for the characteristic pollutants carbofuran and furan phenol, respectively. The COD removal rate was 63%, and the B/C ratio was significantly increased to 0.53. The combination process of coagulation and electrocatalytic oxidation significantly improved the biodegradability of seed coating wastewater, creating favorable conditions for efficient and stable biochemical treatment.

Key words: electrocatalytic oxidation, coagulation, seed coating wastewater, carbofuran

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