CCS (carbon capture and storage) route and biomethane route are very important methods to reduce CO2 emission.But the high cost for CO2 capture in CCS route

and the small scale in biomethane route limit their widespread application.In this work

CCS route and biomethane route were compared in terms of economics and technology.It was found that theoretical energy consumption of biomethane route was only half of that of CCS route.The mild condition to capture CO2 in biomethane route was beneficial to increasing adsorption capacity and then reducing capture cost.Thus biomethane route was better to reduce CO2 emission.In order to solve the problems in CCS route and biomethane route

a new idea to boost biomethane route by coupling of CCS route and biomethane route was proposed.