Anaerobic Treatment of N, N-dimethylformamide-contained Wastewater by Mixing Anaerobic Digestion Sludge and Activated Sludge

摘要

Inoculated with anaerobic digestion sludge, a lab-scale anaerobic membrane bioreactor (AnMBR) obtained inferior removal efficiency and low methane production when treating N, iV-dimethylformamide (DMF) even after 120-day's culturing. In order to enhance the DMF removal performance of AnMBR, another aerobic reactor was conducted with continuously aerating for culturing DMF-hydrolyzing activated sludge. The mixture sludge combined with anaerobic digestion sludge and activated sludge was then tested in a long-term batch experiment for 60 days. Results demonstrated that two kinds of sludge successfully symbiosed under anaerobic condition and could effectively degrade 5000 mg/L DMF within 20 days and massively produce methane biogas. The mixture sludge could be easily cultivated and served as seed sludge for a quick start-up of AnMBR with both excellent DMF removal efficiency and high methane biogas conversion when treating high loading DMF-contained wastewater.