Abstract:

The waste cutting fluid was treated by coagulation-UV/Fenton oxidation process. The optimal conditions of coagulation were determined:pH=7, PAC dosage 2 000 mg/L, and CPAM dosage 10 mg/L. The optimal conditions of UV/Fenton oxidation were determined:H₂O₂ dosage 0.9 Qth, n(H₂O₂):n(Fe²⁺)=50:1, and reaction time 120 min. Under the optimum conditions, COD of the waste cutting fluid was reduced from 21 400 mg/L to 432 mg/L, oil mass concentration was reduced from 4 940 mg/L to 2 mg/L, and BOD₅/COD was increased from 0.069 to 0.784. Thus, the effluent can be directly biologically treated. The experimental results showed that the coagulation-UV/Fenton process is feasible to treat the waste cutting fluid.

Key words: waste cutting fluid, coagulation, UV/Fenton

摘要：

采用混凝-UV/Fenton氧化联合工艺对废切削液进行处理。通过对各影响因素进行考察，确定了混凝最佳条件：pH为7，PAC投加量2 000 mg/L，助凝剂CPAM投加量10 mg/L；UV/Fenton氧化最佳条件：H₂O₂投加量0.9 Qth，n（H₂O₂）：n（Fe²⁺）=50：1，反应时间为120 min。在最佳工艺条件下，废切削液经混凝-UV/Fenton处理后，COD由21 400 mg/L降为432 mg/L，油质量浓度由4 940 mg/L降为2 mg/L，BOD₅/COD由原水的0.069增至0.784，出水可直接进行生物处理。实验证明，混凝-UV/Fenton处理废切削液可行。

关键词: 废切削液, 混凝, UV/Fenton

CLC Number: 

• X703.1