Example of acrylonitrile production wastewater treatment project

Abstract

Aiming at the characteristics of acrylonitrile production wastewater with high concentration of refractory organic matter, high total nitrogen concentration,high toxicity and complex composition, the combined process of “ozone catalytic oxidation+coagulation precipitation+improved A/O” was used to treat the wastewater. The process, main structure and equipment design parameters, debugging difficulties and methods were introduced, and the operation effect and cost were analyzed. The operation results showed that the process has the characteristics of shock load resistance, stable operation and convenient management. After the acrylonitrile production wastewater was treated by this combination process, the mass concentrations of COD, NH3-N, TN, SS, TN and TCN were stable at 34-97, 0.3-2.7, 9-26, 8-23, 0-0.1 mg/L, which could fully meets the indirect emission standard in Table 2 of the Petrochemical Industry Pollutant Emission Standard (GB 31571-2015), while the organic characteristic pollutant acrylonitrile in the effluent was detected to meet the emission limits in Table 3 of the Petrochemical Industry Pollutant Emission Standard(GB 31571-2015), and satisfied takeover standards in the regional centralized sewage treatment plant.

Keywords

• acrylonitrile production wastewater
• restrain
• improved a/o