Abstract:

Dinitroaniline pesticide wastewater is pretreated by the combined process of acid precipitation-Fe/C micro electrolysis-Fenton oxidation. The parameters of the treatment process are optimized. The optimum condition of acid precipitation is pH 2.0. The optimum condition of micro electrolysis treatment are m(Fe):m(C)=2, the dosage 2.0 mg/L. The optimum conditions of Fenton oxidation are:pH 2.5, dosage of H₂O₂ 293.8 mmol/L. No additional Fe²⁺ is required. After the pretreatment, the COD of the wastewater decreases from 24 610 mg/L to 2 543.4 mg/L, and the removal rate reaches 89.7%. The moisture content of the acid precipitation waste can be reduced by adding BaCl₂ and PAM, which can reduce the acid waste by 33.0%.

Key words: dinitroaniline, pesticide wastewater, pretreatment, acid precipitation waste, quantitative reduction

摘要：

通过酸析—铁碳微电解—Fenton氧化组合工艺对二硝基苯胺类农药生产废水进行预处理，并对工艺参数进行优化。酸析处理最佳工艺条件：pH为2.0；铁碳微电解最佳工艺条件：m（Fe）：m（C）为2，投加量2.0 g/L；Fenton氧化处理最佳工艺条件：pH为2.5，H₂O₂投加量为293.8 mmol/L，无需额外投加Fe²⁺。经预处理后，废水COD从24 610 mg/L降至2 543.4 mg/L，去除率达89.7%。BaCl₂和PAM的投加可降低酸析废物的含水率，将酸析废物减量33.0%。

关键词: 二硝基苯胺, 农药生产废水, 预处理, 酸析废物, 减量化

CLC Number: 

• X703