13沉淀与澄清

1(Sedimentation,orsettlingandClarification)111100um2(discreteparticlesettling)StokeslawF1=1/6d3(p-l)gF2=CDlu2/2d2/4CDF1F2(terminalvelocity)CDReRe1,CD=24/RePasdCgullpD342181gdulpdCgullpD342udud1.tiCi2.tiui=h/tiCipi=Ci/C0piui3.pu4.t0uu0uu0hi/h=uit0/(u0t0)=u/u0t=0t=tihpu=h/t3E-tEuP=(C0-C)/C0*100%123v=Q/(h0B)B:IIIu0uu0uu0Eui/u0=ui/(Q/A)q=Q/A=u0u0Eui/u0=ui/(Q/A)000/1)01(piidpuupP4(Hazen,19041EuiqEui2uiAQEA3(flocculentsettling)1tiCi2)p(C0-Ci)/C0*100%3411692...)(/)(/34002230012pputhpputhpP5PC0-C/C0*100%Ch/2----t------Pq4(Hindered(Zone)settling)SS4162AB11VsCD221122ttc1122/62-3g/L1g/L5g/L116b-c11CcHOA1/OA2OB1/OB2KynchVsVs=f(C)Vs=ac-nn1511v0.15-0.2m/s2A1A2B1B27Re=vR/Frv2/RgFrRL/B4,L/H1010-25mm/s57mm/s3500m3/(md)2.9L/(ms)1.5-2.9L/(ms)41.52.0m21u0T0u0-----T0-------uu0/1.25-1.75T1.5-2.0T0quqm3/m2hT(h)121-31.5-31-21-21.5-2.51-1.51.5-2.528qAQ/qL=3.6vTTv10-25mm/s57mm/sBA/LTVQTH3.0-3.5mBV/(LH)L=3.6vTFr10-4~10-5vvv,u0---uvu1p0v1.5-3m/h,T12.0hvA=Q/vATHvT/H310m30mm/s912030mm16mmqAQ/qHuTu:1.5-3m/h;T:1.5-2.5h211ui/Q/AHAQ101904Hazen1945Camp1955FrRe19591972Rd/3---------Rd/3--------2160L1-1.2m50150mm0.5-1.0m0.5-1.0mu0=0.2-0.4mm/s,v3mm/sQu0AA0.6-0.8A1123040Qu0AA3ReQu0A3q911m3/(m2h)q2m3/(m2h)Re2005000.3m/s,0.15m/s30s,30-60s0.25-0.3m/sT1-3min,0.1m/s126(Clarifier)20301920infilco193519651520Q710Q13v11.2mm/st11.5hQ35Q21127,v47m/sv23m/sv=60mm/st1530sv4050mm/sv5mm/st80100sv11.2mm/s,t1h24Q12142530s610s19562030v0.8-1.0mm/s