Abstract:

Imidacloprid pesticide wastewater is a kind of typical organic wastewater. Containing the persistent organic pollutants with high concentration, it is difficult to be directly degraded only by bio-treatment, and it needs physico-chemical process as its pretreatment before bio-treatment. In this experiment, alkaline hydrolysis-microelectrolysis process is used as main pretreatment technology for this pesticide wastewater. This method could reduce the concentration of organic pollutants effectively; also, it could increase the biodegradability of the wastewater, and create favorable conditions for the subsequent bio-treatment. The optimal conditions of the pretreatment are determined as follows: alkaline hydrolysis-temperature is 70 ℃, pH 13 and reaction time 2 h; microelectrolysispH₃-4 and reaction time 3 h. After the pretreatment, the removal rates of COD and chroma are about 65% and above 90%, respectively. The ratio of BOD5 to COD is increased to about more than 0.25, and the biodegradability of the wastewater has been improved evidently.

Key words: imidacloprid pesticide wastewater, pretreatment, alkaline hydrolysis, microelectrolysis

摘要：

吡虫啉农药生产废水是一种典型的高浓度难降解有机废水，可生化性差，需采用物化法作为其预处理手段。实验采用碱解-微电解作为吡虫啉农药生产废水的主要预处理工艺，能有效地降低废水中有机物浓度，使预处理出水的可生化性大大提高，保证其后续生化处理的有效进行。实验表明，碱解最佳条件：温度70℃，pH 13，反应时间2 h；微电解最佳条件：pH 3~4，停留时间3 h。预处理出水的COD总去除率为65%左右，色度的去除率达90%以上，m（BOD₅）：m（COD）提高到0.25以上，可生化性大大提高。

关键词: 吡虫啉生产废水, 预处理, 碱解, 微电解

CLC Number: 

• X703.1