Abstract: Based on the actual situation of silver catalyst production equipments, an advanced and efficient wastewater treatment technology was developed. By adopting the technology route of reaction/sedimentation/membrane treatment, comparative experiments were conducted on different precipitation reaction materials and filtration media to design an experimental device with a key equipment of expanding drum filter.Compared with the conventional industrial process, the aeration process has been cancelled and the Ag⁺ concentration in wastewater tends to be stabilized after the static placing time reaches 2 h. Moreover, the concentration of Ag⁺ in the wastewater could be reduced from 200—1500 mg/L to 0.05 mg/L or less. This technology could meet the industrial wastewater discharge standards and achieve the recycling and utilization of Ag⁺, bringing a great application prospect.

Key words: silver-containing wastewater, silver recycling, silver catalyst, expanding drum filter