Septic Tank Design Parameters and Calculations, Exams of Public Health

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SEPTIC TANK DESIGN

CE/SE/MP Design Parameters T Overall Hydraulic Residence Time (HRT) day P. Number of Occupants = ig cap a Sewage Flow Rate ds Sludge Production Rate = 0.5lpd/cap T Temperature n Interval of Desludging Operation = oycars Sedimentation Zone P Number of Occupants aq Wastewater Flow t- Minimum HRT for Sedimentation vi t,- Required HRT for Sedimentation re Vern Sedimentaion Zone Volume = 1,32m$ Sludge Digestion Zone P Number of Occupants = l5cap Gs, Sludge Production Rate = O.alpd/cap T Temperature uns Minimum TIRT for Anaerobic Digestion = t, TIRT Vy, Sludge Digestion Zone Volume = 0.27m3 a Required HRT for Anacrobic Digestion = 1 = 190lpd/cap = “Be locap 190\pd/cap 0. 2day O.4Gday Adopt Required TIRT = 30° C 4538days 3lidays Adopt Required Digested Sludge Storage Zone PP Number of Occupants = ldcap n Interval of Desludging Operation = oyears tr Rate of Accumulation of Digested Sludge = 0.06 m? /cap/year Vi Digested Sludge Storage Zane Volume = 4.5m* Scum Storage Zone Vee Scum Storage Zone Volume 1,8m* v Misccllancous e Provide one manhole per chamber with minimum dimension of 500mm. e Inlet and outlet connection shall be sanitary tee with size same as building sewer, e Ensure watertightness by application of approved waterproofing materials. e Bottom slab shall rest on 50mm 95% compacted gravel bed and on undisturbed soil. e For structural details refer to structural engineering plans. Special Note e Septic tanks, if sewer is not available shall be connected for further treatment process. To complete the septic tank system, additional treatment processes shall be applied such as e!fuent filter, sand filtration or disinfection system prior Lo disposal, Operation and Maintenance of Septic Tank Systems. e DOH Administrative Order No, 2019-0047, National Standard on the Design, Construction, Reference: