Evaluation of Greenhouse Gas Emissions from Septic ... - Geoflow

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APPENDIX CESTIMATE OF METHANE EMISSIONS FROM SEPTICTANK SYSTEM BASED ON IPCC METHODOLOGY(1996, 2007)The following estimate was based on the methodology developed in the IPCC guidelinesfor National Greenhouse Gas Inventories, Chapter 6, Methane Emission from Wastewater.Calculations will be based on per-capita basis.1. Estimate organically degradable carbon in wastewater (TOW)TOW = P x BOD x I X 365, where:Where TOW = total organics in wastewater in kg BOD/yrP = populationBOD = U.S. per capita BOD in inventory year (value taken from Table 6.4,Estimated BOD 5 values in domestic wastewater for selected regions and countries.The values are an assessment of the literature. Chapter 6, IPCC, 2006)I = correction factor, default value 1.0TOW = 1 person x 85 g BOD/capita⋅d x 1.0 x 0.001 kg/g x 365 d/yrTOW = 31.03 kg BOD/capita⋅yr2. Calculate the methane CH 4 emission factor (EF j )EF j = B o x MCF j , in kg CH 4 /kg BODWhere B o = maximum CH 4 producing capacity in kg CH 4 /kg BOD (value takenfrom Table 6.2, Default maximum methane producing capacity for domesticwastewater. Chapter 6, IPCC 2006)MCF j = methane correction factor for septic tanks (value taken from Table 6.3,Default methane conversion values for domestic wastewater. Chapter 6, IPCC2006)EF j = 0.6 kg CH 4 /kg BOD x 0.5EF j = 0.3 kg CH 4 /kg BOD3. Estimate the per capita CH 4 emissionMethane emission = TOW x EF j in g CH 4 /capita⋅dCH 4 = (31.03 kg BOD/ capita⋅yr) (0.3 kg CH 4 /kg BOD)9.3 kg CH 4 /capita⋅yr = 25.5 g CH 4 /capita⋅dComment:It should be noted that in the above computation it is assumed that half of all influent BOD isconverted anaerobically.Evaluation of Greenhouse Gas Emissions from Septic Systems C-1
C-2
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D e c e n t r a l i z e dEvaluation
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The Water Environment Research Foun
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ABSTRACT AND BENEFITSAbstract:This
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3.1.2 Flux Chamber Inserts for Sept
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LIST OF TABLESES-1 Summary of Metha
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3-7 Use of Flux Chamber in the Soil
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Evaluation of Greenhouse Gas Emissi
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tank is converted anaerobically. Fu
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RecommendationsBased on the finding
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♦♦Collection of gas samples fro
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include Imhoff tanks, anaerobic baf
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2.2 Septic Tank CharacteristicsSept
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2.2.3 General Conversion Processes
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increase in thickness with daily so
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environmental damage and/or health
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Figure 2-6. The Intermediate Steps
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In anaerobic reactors, the alkalini
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epresentative concentrations. Inhib
Page 37 and 38: 2.4 Gas Emissions from Septic Syste
Page 39 and 40: Figure 2-9. Flux Chamber Designed b
Page 41 and 42: due to settling and anaerobic diges
Page 43 and 44: total methane production value of 1
Page 45 and 46: 2-26
Page 47 and 48: The main body of the flux chamber w
Page 49 and 50: 3.1.3 Flux Chamber Design for Use i
Page 51 and 52: 3.2 Sampling ProtocolsThe three pri
Page 53 and 54: 3.2.3 Sampling Method for Vent Syst
Page 55 and 56: 3.3 Gas AnalysisThe gas samples wer
Page 57 and 58: ppm (raw data from laboratory) were
Page 59 and 60: gal. Sites 5, 6, and 7 were the onl
Page 61 and 62: Table 4-2. Continued from previous
Page 63 and 64: Three of the septic tanks that appe
Page 65 and 66: steeper than that for the rest of t
Page 67 and 68: espectively, and for methane were 4
Page 69 and 70: oth before and after the septic tan
Page 71 and 72: noted that in this approach it is a
Page 73 and 74: The septic tank effluent CO 2 equiv
Page 75 and 76: (a)(b)Figure 5-9. Gas Emission Rate
Page 77 and 78: Figure 5-11. Emission Rates from Si
Page 79 and 80: (a)(b)Figure 5-13. Views of the Eff
Page 81 and 82: It is important to note that the U.
Page 83 and 84: ♦ Methane generated during the an
Page 85 and 86: A-2
Page 87: B. Based on COD Loading1. Determine
Page 91 and 92: 2. First row of Table 23 from Sasse
Page 93 and 94: Biogas production = (COD inflow - C
Page 95 and 96: E-2
Page 97 and 98: SAMPLING FROM SOIL SURFACEDate:Hour
Page 99 and 100: F-4
Page 101 and 102: G-2
Page 103 and 104: DateSamplelocationGas measurement (
Page 105 and 106: After the initial inspections, Site
Page 107 and 108: H-2 Site 2The scum layer in the fir
Page 109 and 110: Table H-10. GHG Emission Rates From
Page 111 and 112: Table H-14. Summary of the Water Qu
Page 113 and 114: Table H-18. Summary of the Water Qu
Page 115 and 116: Table H-22. GHG Emission Rates from
Page 117 and 118: Sample Gas measurement (g/capita·d
Page 119 and 120: H-9 Summary of ResultsA summary of
Page 121 and 122: I-2
Page 123 and 124: Treatment in Decentralized Wastewat
Page 125 and 126: Philip, H., S. Maunoir, A. Rambaud,
Page 127 and 128: Winfrey, M.R. and J.G. Zeikus (1977
Page 129 and 130: Fort Worth, City ofHouston, City of
Page 132: W E R F P r o d u c t O r d e r F o
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