Pesticide wastewater treatment by combination process of air flotation/iron-carbon /Fenton+ hydrolytic acidification+A/O+ contact oxidation

Abstract

A combined process of air flotation/iron carbon microelectrolysis /Fenton+ hydrolytic acidification +A/O+ contact oxidation is used to treat pesticide wastewater . The results show that，when the influent COD，NH3-N and toluene concentrations are 7 866，56 and 53 mg/L，the treated effluent COD，NH3-N and toluene concentrations are 435，13 and 0.4 mg/L，respectively. The average removal rates of COD，NH3-N and toluene were 94.5%，81% and 99.2%，respectively. The drainage index reached the Class B standard of Quality Standard for Sewage Discharge into Urban Sewers （GB/T 31962—2015），and the process efficiency was reliable，which can provide reference for the design and construction of similar pesticide wastewater treatment.

Keywords

• pesticide wastewater
• air flotation
• fenton
• contact oxidation