摘要:
含N-甲基二乙醇胺(MDEA)的检修废水中总有机碳(TOC)、总氮(TN)含量高,具有一定的抗氧化性和生化抗性,是当前石油化工企业亟待解决的环保难题。电催化氧化技术可实现难降解有机废水的同步脱氮除碳处理,适用于处理有机氮污染的含MDEA检修废水。基于响应曲面法,以初始pH、极板间距、电流密度为影响因子,TN去除率和TOC去除率为响应值,建立了电催化氧化处理MDEA模拟废水的二次多项式回归模型。模型预测最佳条件为初始pH 10.00、极板间距2.50 cm、电流密度90 mA/cm2,此条件下TN去除率和TOC去除率分别为89.0%和95.9%,与实验值的误差分别为1.1%和1.5%,优化结果可信。在最佳反应条件下处理含MDEA的实际检修废水,TN去除率可保持90%以上,而TOC降解率仅61.6%,这是由废水中含有N-苄基二甲胺、苯并三唑及噻吩等难降解的含N、S杂环类化合物导致的。
关键词:
电催化氧化,
N-甲基二乙醇胺,
响应曲面法,
总有机碳,
总氮
Abstract:
N-Methyldiethanolamine(MDEA)-containing overhaul wastewater contains high levels of total organic carbon(TOC) and total nitrogen(TN), with certain antioxidant properties and biochemical resistance, posing an urgent environmental challenge for petrochemical enterprises. Electrocatalytic oxidation technology enables simultaneous nitrogen and carbon removal from refractory organic wastewater, making it suitable for treating MDEA-containing overhaul wastewater contaminated with organic nitrogen. Based on the response surface methodology, a quadratic polynomial regression model was established for the treatment of MDEA simulated wastewater by electrocatalytic oxidation with initial pH, plate spacing and current density as influencing factors, TN and TOC removal rates as response values. The optimal reaction conditions predicted by the model were initial pH of 10.00, plate distance of 2.50 cm, and current density of 90 mA/cm2. Under these conditions, TN and TOC removal rates were 89.0% and 95.9%, respectively, and the relative errors were 1.1% and 1.5%, respectively, indicating that the optimization results were reliable. Under optimal reaction conditions for treating actual MDEA-containing overhaul wastewater, the TN removal rate could be maintained above 90%, while the TOC degradation rate was only 61.6%, which was due to the presence of refractory heterocyclic compounds containing N and S, such as N-benzyldimethylamine, benzotriazole, and thiophene in the wastewater.
Key words:
electrocatalytic oxidation,
N-methyl diethanolamine,
response surface methodology,
total organic carbon,
total nitrogen
中图分类号:
温福, 李阳, 王储, 李敏, 李晋. 响应曲面法优化电催化氧化处理MDEA废水[J]. 工业水处理, 2025, 45(6): 39-45.
Fu WEN, Yang LI, Chu WANG, Min LI, Jin LI. Optimization of electrocatalytic oxidation treatment of MDEA wastewater by response surface methodology[J]. Industrial Water Treatment, 2025, 45(6): 39-45.