e nhancement of methane productivity of anaerobic reactors of wasterwater treatment plants

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E nhancement of Methane Productivity of Anaerobic Reactors of Wasterwater Treatment Plants. Aare Kuusik, E. Loigu, O. Sokk , Argo Kuusik Estonia. Objectives of Experiments:. Enhancement of methane productivity of existing anaerobic reactors - PowerPoint PPT Presentation

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  • Enhancement of Methane Productivity of Anaerobic Reactors of Wasterwater Treatment PlantsAare Kuusik, E. Loigu, O. Sokk, Argo Kuusik Estonia

  • Objectives of Experiments: Enhancement of methane productivity of existing anaerobic reactorsTo get rid of inconvenient waste solids: waste glycerol and fishery residuesTo resolve above problems in one process

  • Self-made Reactor

  • Self-made Reactors

  • Manufactored ReactorsArmfield W8

  • Technological Scheme of Self-made Reactor

  • Technological Scheme of Manufactured Reactor

  • Maintenance of Reactors Mesophilic temperature 36-39 oC, mainly 37-38 oCBatch type or fill and draw input-output of sludge every morningBefore and after the input-output process the contents of the reactors were mixedProduced biogas was evaluated

  • Concentrations were measuredEvery morning: pH, H2S, NH3, CO2, O2

    Once a week: TS and VS, VFA and alkalinity of input and output sludge

  • The data of the single sludge digestion was summarised

    Days consi-deredReten-tion ti-me, daysVolume load TS kg/m3Input, g/LOutput, g/LOrganic removal input-output, g/LTSVSTSVSTSVS9 -21400.88535.426.62522.37514.0513.02512.62522 - 30351.01135.39426.6222.15913.23413.2341338.831 41301.08832.64424.16922.33113.81910.31310.3542 55251.04826.20316.2556 - 82201.60132.02522.37521.86313.71310.1638.663Average1.22731.97222.69322.113.72811.24210.504

  • Continuation of previous table (single sludge)

    Retention time, daysTempe-ratureoCMethane yieldMethane contents in biogas %Solid removal %Per volume L/m3TS removed L/kgTSVS4036,5109.7339.650.9836.5147.233537,482.1217.151.8437.4050.253036,492.9270.352.1631.5942.812538,5117.954.512037,9171.5337.2457.5931.7538.68Average37.2128310.954.3933.5542.95

  • Admixed sludge (sludge 98% + 2% waste glycerol) digestion

    Days consi-deredReten-tion time, daysVolum load, TS kg/m3/dInput, g/LOutput, g/LDifference between input-output, g/LTSVSTSVSTSVS12 19 40 1.31552.57542.37523.014.52529.57527.8520 39 35 1.45851.03440.99423.16614.32827.86926.66640 63 30 2.56744.92534.61323.26910.44821.65624.16964 75 25 2.11052.7541.12530.67217.89122.07823.23476 80 20 2.49749.93838.21324.5439.53625.416.175Average2.01649.30738.75624.58813.27424.72024.578

  • Continuation previous table (sludge 98% + glycerol 2%)

    Reten-tion time, daysTempe-rature oCMethane yieldMethane contents in biogas, %Solid removal %Per reac-tor volu-me, L/m3Per TS removed, L/kgTSVS40 37336.7483.562.7156.365,7235 37268.8352.861.1754.6265,0630 39.3287.3356.661.8148.1969,8225 36.5386.8416.360.0541.8556,4920 37.9536.7374.261.7550.8575,06Average37.8323381.961.4250.166

  • The weighted means of experiments

    Subs-trateDays consi-deredRetention time,daysTS input,g/LVS input,g/LTS output,g/LVS output,g/LTS,g/LVS,g/LSludge 100%7327.632.0 (26.2-35.4)22.7 (16.3-26.6)22.1 (21.9-22.4)13.7 (13.2-14.1)11.2 (10.2-13.2)10.5 (8.7-13.4)Sludge 98% + glycerol 2%6931.049.3 (44.9-52.8)38.8 (34.6-42.4)24.6 (23.0-30.7)13.3 (9.5-17.9)24.7 (21.7-29.6)24.6 (16.2-27.9)Sludge 95% + glycerol 5%703564.0 (58.2-77.3)58.6 (48.8-64.1)27.0 (23.5-32.3)15.1 (10.8-19.0)44.5 (34.4-53.8)43.7 (38.0-50.7)Sludge 98% + fish 2%2935.743.0 (40.4-46.8)32.4 (30.2-34.8)23.8 (21.5-24.6)14.0 (12.8-15.0)20.8 (18.9-22.6)18.4 (17.4-19.9)

  • Continuation of weighted means table

    SubstrateMethane yieldMethane contents in biogas %Solid removal %Per volume ,L/m3Per remo-ved TS, L/kgTSVSSludge 100%128 (82-172)310.9 (217-340)54. (51-57.6)33.6(31.6-37.4)43(38.7-50.3)Sludge 98% +2% glyc.323(269-537)381.9(338-455)61.4(60.1-62.7)50.1(41.9-56.3)66(65.1-75.1)Sludge 95% + 5% glyc.488.6(234.9-705.3)386.1(273.1-530.4)59.3(57-61.6)62(54.7-69.6)74.3(68.1-77.9)Sludge 98% +2% fish369.4(328.9-419.5)627.7(582.6-686.2)63.5(62.4-64.9)48.5(46.7-50.7)56.8(55.8-57.7)

  • Percentage comparison of essential weighted means (in brackets)

    SubstrateRetention time in daysPercentage relationsTS load per reactor volume(kg/m3)Solids residue after treatment(g/L)CH4 produc. per reactor volume, (L/m3)Raw sludge 100%40 - 20100 (1,227)100 (22.1)100 (128)Sludge 98%+ glycerol 2%40 - 20164 (2.016)111.3(24.588)252 (323)Sludge 95% + 5% glycerol40 20173.1(2.124)122.1(26.994)382 (488.6)Sludge 98% + fish resid. 2%40 - 3099 (1.215)107.9(23.836)288.6(369.4)

  • THANK YOU FOR YOUR ATTENTION

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