Food　waste　and　waste　paper　are　the　two　largest　components　of　municipal　solid　waste,　and　many　previous　studies　found　that　their　co-digestion　improved　methane　yield.　This　study　investigated　the　anaerobic　co-digestion　of　0–100%　food　waste　with　paper　food　packages　on　lab-scale　with　feedstock-to-inoculum　(F/I)　ratios　from　0.5　to　6　(based　on　volatile　solids,　VS)　and　total　solids　contents　from　8%　to　28%.　In　addition　to　methane　yield,　volumetric　productivity　and　process　economics　were　also　used　to　evaluate　the　operating　parameters.　Results　showed　that　the　highest　cumulative　methane　yield　of　around　530　L/kg-VSfeed　was　obtained　from　100%　food　waste　at　F/I　ratios　of　0.5,　1,　and　2;　the　highest　volumetric　methane　productivity　of　44.2　L/Lwork　was　achieved　with　25%　food　waste　at　an　F/I　ratio　of　6;　and　the　highest　annual　net　profit　was　obtained　from　75%　food　waste　at　an　F/I　ratio　of　2,　which　also　achieved　the　highest　internal　rate　of　return　(20.7%)　and　the　shortest　payback　period　(5　years).　Addition　of　waste　paper　packages　to　food　waste　could　enhance　the　digester　stability,　and　it　is　beneficial　to　allow　certain　amount　of　paper　packages　and　tissues　to　be　collected　together　with　food　waste　during　the　initial　source　separation.　©　2022　Elsevier　Ltd