斜管(板)式沉淀池設(shè)計(jì)計(jì)算書

,斜管（板）式沉淀池設(shè)計(jì)計(jì)算書,,,,,,

,斜管（板）式沉淀池設(shè)計(jì)計(jì)算,,,,,,

,1、已知條件,,,,,,

,最大設(shè)計(jì)流量Qmax,125,m3/h,,,,

,變化系數(shù)K,1.5,,,,,

,氧化池懸浮固體濃度X,2500,mg/L,,,,

,二沉池底流生物固體濃度Xt,9000,mg/L,,,,

,污泥回流比R,50%,,,,,

,斜管長度L,1.00,m,,,,

,傾斜角度θ,60,,,,,

,2、設(shè)計(jì)計(jì)算,,,,,,

,（1）沉淀部分水面面積A,,,,,,

,二沉池表面負(fù)荷q,0.90,m3/m2·h,,,,

,二沉池個(gè)數(shù)n,6,個(gè),,,,

,斜管面積利用系數(shù)η,0.91,,,,,

,,38.16,㎡,,,,

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,,,,,,,,

,(2)池子平面尺寸,,,,,,

,采用正方形池a,,,,,,

,,6.177,m,,,,

,,,,,,,,

,二沉池長L=,6.20,m,,,,

,(3)池內(nèi)停留時(shí)間，t，min,,,,,,

,,,,,,,,

,,,,,,,,

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,式中h2—,1.000,m，斜管區(qū)上部清水層高度,,,,

,h3—,0.866,m，斜管的自身垂直高度,,,,

,,,,,,,

,,124.40,min,,,,

,,,,,,,,

,(4)校核固體負(fù)荷G,,,,,,

,,49.14,[kg/(㎡·d)],,,,

,(5)污泥區(qū)的容積V,,,,,,

,污泥區(qū)容積按貯泥時(shí)間t確定,3,h,,,,

,,163.04,m3,,,,

,,,,,,,

,每個(gè)沉淀池污泥區(qū)容積V'＝,27.17,m3,,,,

,總污泥量,163,m3,,,,

,(6)污泥斗的容積,,,,,,

,①污泥斗高度,,,,,,

,污泥斗底部邊a1,1,m,,,,

,污泥斗上部直徑a,6.20,m,,,,

,傾斜角θ,45,°,,,,

,則,2.6,m,,,,

,,39.62,m3,,,,

,泥斗總?cè)莘e為VO,237.74,m3，大于污泥設(shè)計(jì)量,,,,

,(7)沉淀池的總高度H,,,,,,

,設(shè)置超高h(yuǎn)1,0.30,m,,,,

,緩沖層高度h4,0.50,m,,,,

,沉淀池總高度H,,,,,,

,H＝h1+h2+h3+h4+h5,5.266,m,,,,

,(8)流入槽設(shè)計(jì),,,,,,

,"采用條形平底槽,等距設(shè)布水孔",,,,,,

,孔徑d,32,㎜,,,,

,并加短管L,100,㎜,,,,

,①流入槽,,,,,,

,設(shè)流入槽寬B,0.4,m,,,,

,槽中流速取v,1.4,m/s,,,,

,則槽中水深h,,,,,,

,,0.02,m,,,,

,②布水孔數(shù)n,,,,,,

,布水孔平均流速,,,,,,

,式中Vn—配水孔平均流速，0.3～0.8m/s,,,,,,

,"t—導(dǎo)流絮凝區(qū)平均停留時(shí)間,s，池周有效水深為2～4m時(shí)，取有",,,,,,

,時(shí)間為360～720s,,,,,,

,v—污水的運(yùn)動(dòng)黏度，與水溫有關(guān),,,,,,

,Gm—導(dǎo)流絮凝區(qū)的平均速度梯度，一般可取10～30s-1,,,,,,

,取t=,650,s,,,,

,Gm=,20,s-1,,,,

,水溫20℃時(shí)，v＝,0.00000106,m2/s,,,,

,,0.74,m/s,,,,

,布水孔數(shù),,,,,,

,,78001,個(gè),,,,

,③孔距L,,,,,,

,,2.564060468,㎜,,,,

,,,,,,,

,水槽總長度,200,m,,,,

,④校核Gm,,,,,,

,"式中V1—配水孔水流收縮斷面的流速，m/s，V1＝Vn/ε,ε=1",,,,,,

,V2—導(dǎo)流絮凝區(qū)平均向下流速，m/s，V2＝Q/f,,,,,,

,f—導(dǎo)流絮凝區(qū)環(huán)形面積，㎡,,,