Treatment of low mass concentration N,N-dimethylformamide wastewater by adsorption method

Activated carbon was used for the treatment of low mass concentration N,N-dimethylformamide(DMF) wastewater from 6 stages of countercurrent extracting.The effect of activated carbon adsorption isotherm and activated carbon dosage on the adsorption process was researched.The effect of wastewater flow rate and activated carbon types on the dynamic adsorption was also researched.The experimental results show that when the wastewater flow rate is about 2 mL/min and the activated carbon particle size is 1-2 mm,the dynamic adsorption presents good performance.At this time,the dynamic adsorption breakthrough point is 180 min,the saturated adsorption capacity of activated carbon for DMF is 53.50 mg/g.After the adsorption,the mass concentration of DMF in wastewater can be reduced to 9 mg/L below,thus coming up to the Class 1 criterion of the national standard.