Be Tu Hoai - Septic TankTNH TON B T HOISEPTIC TANK CALCULATIONSTTNO.TN THNG S TNH TONCALCULATE PARAMETER NAMEK HIUSYMBOLGI TRVALUEN VUNITGHI CHMARK1Th tch phn vng ni ca b t hoiSuspended scum volume of septic tankVv28.8mLy bng 0.4 - 0.5Vt.Selected 0.4 - 0.5Vt.2Khong thi gian gia 2 ln ht cnTime of mud drainageT1.5nmyear3Lng cn tch ly trong b ca 1 ngi trong nmMud in tank of one person in the yearr40l/ngi.nml/person.year4Dung tch phn cn tch ly ( phn hy)Mud accumulated volume (decomposed)Vt72m5Lng cn ti trung bnh trong vng phn hyArrange of fresh mud volume in decomposed area0.5l/ngi.ngyl/person.day6Thi gian cn thit phn hy cnTime for mud decomposedtb40ngydayNhit nc thi l 250C.Waste-water temperature is 250C.7Th tch phn cn ti (ang phn hy) Fresh mud volume (decomposing)Vb24m8Thi gian lu nc ti thiu trong b t hoiTime of minimum water accumulatedtn0.5ngyday9Tiu chun thi nc sinh hot vo b t hoiCriterion of waste-water to septic tankq045l/ngi.ngyl/person.day10Dn s tnh tonProjected populationN1200ngiperson11Lu lng trung bnh ca nc thi chy vo bArrange of waste-water volume to the tankQ54m/ngym/day12Th tch vng cha bn cn v vng ni trong b t hoiVplume of mud area and scum area in septic tankVc125m13Th tch vng lng ca b t hoiVolume of septic tank setling areaVn27m14Th tch phn lu khng, tnh t mt nc ln tm an np bCovering volume, from water level to tank coverVk30m15Th tch t ca b t hoiWet volume of septic tankV152m16Th tch b t hoiSeptic tank volumeV182mNgun: Theo TCXD - s 2/2008, B Xy Dng.Source: By TCXD - s 2/2008, Ministry of Construction.