Mechanism of enhanced anaerobic digestion by PAC promoting direct electron transfer for SMX wastewater treatment
Antibiotics significantly inhibit anaerobic digestion,and it is important to optimize the treatment and resource recovery of pharmaceutical wastewater by exploring simple and easy methods for promoting interspecies electron transfer.Herein,the efficacy and mechanism of powdered activated carbon(PAC)-enhanced anaerobic digestion for the treatment of high-concentration sulfamethoxazole(SMX)wastewater were investigated.SMX with high concentration hindered anaerobic digestion,resulting in a 13％reduction in maximum methane production.The addition of either 4 g·g-1(as COD)or 8 g·g-1 PAC to the anaerobic digested sludge could avoid the inhibition and significantly improve methanogenesis by 22.4％compared to the SMX-exposed control group.In addition,PAC boosted anaerobic metabolic activity,enriching sludge with ATP,Cyt C,and coenzyme F420,which were important energy storage and transport substances for microorganisms,as well as direct interspecies electron transfer(DIET)flora and dominant genera associated with SMX degradation.PAC could strengthen the DIET between the oxidizing bacteria in VFAs(Syntrophobacter and Syntrophomonas,etc.)and methanogenic bacteria(Methanosarcina),facilitating the conversion of VFAs to methane.
sulfamethoxazoleanaerobic biodegradationmethane productiondirect interspecies electron transfer
万方数据
维普
