摘要：

采用电催化+电絮凝的双电解工艺处理食用油生产废水中有机磷，首先用电催化氧化有机磷为PO₄ ^3-，然后采取电絮凝产生的Fe²⁺、Fe³⁺与PO₄ ^3-发生沉淀反应，即可实现出水总磷≤1.0 mg/L的排放要求。分别考察了单体式双电解反应器和分体式双电解反应器的最优运行条件。结果表明，在食用油废水硬度、Cl^-、有机磷分别为31、505、1.78 mg/L时，单体式双电解工艺和分体式双电解工艺最佳试验条件均为pH=8，电流密度150 A/m²，无需补充硬度和Cl^-。此条件下，将75 L/h食用油废水电解1 h，出水总磷分别为0.94、0.81 mg/L，吨水能耗分别为5.76、5.79 kW·h，分体式双电解反应器比单体式双电解反应器去除单位质量总磷能耗低18.5%，效率更高。后续可通过优化电极板等措施提升双电解反应器的效率，从而有效降低工艺能耗，解决工业化推广中运行费用偏高的难题。

关键词: 有机磷, PO₄ ^3-, 电催化, 电絮凝, 双电解

Abstract:

The dual electrolysis process of electrocatalysis and electrocoagulation was used to treat organic phosphorus in edible oil production wastewater. Firstly, organic phosphorus was oxidized to PO₄ ^3- by electrocatalysis, followed by a precipitation reaction with Fe²⁺ and Fe³⁺ generated by electrocoagulation, achieving an effluent total phosphorus (TP) concentration of ≤1.0 mg/L. The optimal operating conditions of both integrated and separated dual electrolysis reactors were investigated separately. The results showed that when the hardness, Cl^-, and organic phosphorus concentrations in the wastewater were 31 mg/L, 505 mg/L, and 1.78 mg/L, respectively, the optimal experimental conditions for both integrated and separated dual electrolysis processes were pH=8 and a current density of 150 A/m², with no need for supplemental hardness or Cl⁻. Under these conditions, when the electrolysis time of 75 L/h edible oil wastewater was 1 hour, the total phosphorus in the effluent was 0.94 mg/L and 0.81 mg/L, respectively. The energy consumption per ton of water was 5.76 kW·h and 5.79 kW·h, respectively. The separated dual electrolysis reactor had 18.5% lower energy consumption per unit mass of TP removal and higher efficiency compared to the integrated electrolysis reactor. Subsequently, measures such as optimizing electrode plates could be taken to improve the efficiency of the dual electrolysis reactor, effectively reducing process energy consumption and solving the problem of high operating costs in industrial promotion.

Key words: organic phosphorus, PO₄ ^3-, electrocatalysis, electroflocculation, dual electrolysis

中图分类号: 

• X703.1