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2.1.Giới thiệu :
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2.3. Lựa chọn công nghệ xử lý nước thải
2.3.1 Phương án 1:
®_<FG;?`;;Pit;FjDO<zQO—<]O<~;?O<s`O;FjD;<PA`ibFvDA`iXGAM
O9^AXGA;FjDO<zQXGAbW;O9^Aq€ETXˆ;?~;?••;D@`_bW;;?Z;OQW_;<†;I[=
Ls;?D<“;9`Dt_<:;D<lOO<zQ9“;?QnE^QO9x;Ls;?D<“;9`DbFvDD<[ia;OjQ;GQOQW_;<†;
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FjDL=[r<Q{[=XaE“;?bFvDbF=bW;£aE“;?baLCDr<‡Ex;A…;<QW[r<‡¤tO^Q
b‚iD`DD<lOr<\;?<sPO=;O9s;?;FjDO<zQ;<FD<lO<n[DGtbFvD?QnE^QSPEx;A…;
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bF=SPsXaD<Y=D<[ia;bW;;GQOQW_;<†;
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<FG;?`;bzAXzs<Q][{[zq€ET
2.3.2 Phương án 2:
FjDO<zQO—<]O<~;?O<s`O;FjD;<PA`ibFvDA`iXGAMO9^AXGA;FjDO<zQ
XGAbW;O9^Aq€ETXˆ;?~;?••;D@`_bW;;?Z;OQW_;<†;I[=Ls;?D<“;9`Dt_<:;
D<lOO<zQ9“;?QnE^QO9x;Ls;?D<“;9`DbFvDD<[ia;OjQ;GQOQW_;<†;q€ETD<lOO<zQ9“;
Mb‚iO=O<QWOrWXaE“;?D‚;Xˆ;?babzAXzs<Q][{[zE“;?D`DD‰;Ej;‹=[AkOO<cQ
?Q=;tD`DD‰;Ej;E“;?O—XaE“;?bFvDbF=bW;;GQOQW_;<†;q€ET
FjDL=[r<Q{[=XaE“;?bFvDbF=bW;XaO`D<•:[A”tO^Qb‚iEFv;?•:[A”L|
bFvDO`D<SPO<[?sASpXaD<Y=•:[A”R;;FjDO<zQO9s;?XaOQW_OCDS†;D<[ia;bW;
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;?PibxAI
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q€ET;FjDO<zQXQWO9ˆ;?•Q];O‡D<A‰OXˆ;?•drQW;q‚iO9^Aq€ETX}?QjQ<^;SPD@
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Bảng 3.1 Dao động lưu lượng và hàm lượng BOD
5
theo giờ trong ngày.
Bảng 3.2 Thành phần và tính chất nước thải
Thông số Đầu ra Mức độ xử lí cần đạt
_ /t ¯"t# /¯0
'
Oo;?tA? 0 ° !
‘g±…E•=<EtA? (! °
o;?_tA? 5 °(
‹‹tA? (" °!
3.2Lựa chọn công nghệ xử lý nước thải:
3.2.1 Xác định các lưu lượng tính toán và hệ số không điều hòa
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5 #t # ! #! t# !
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3.2.2 Lựa chọn công nghệ xử lý nước thải
'd=SPsO<P;<_<:;O‡;<D<lO;FjDO<zQb:[SPstix[D:[SpD<lOEFv;?;FjDO<zQ
L=[q€ETt{[iA\D\;?L[lOSPbQp[rQ];?QjQ<^;Sp•Q];O‡D<A‰OXˆ;?tD@O<aD<e;LG
b•D\;?;?<]<]O<~;?q€ET;FjDO<zQD<sq‡;?<Q]_;<FN;<
3.3Tính toán các công trình đơn vị xử lý nước thải
3.3.1 Song chắn rác
g‡D<O<FjDLs;?D<“;9`DD@O<aD<e;O<…sz;? 'sD\;?L[lO;<„SPEFv;?
9`Dr<\;?Ej;tD<e;Ls;?D<“;9`DEPAL^D<Xˆ;?O<VD\;?
Kích thước mương đặt song chắn
<e;O~Dbk•R;?D<ziO9s;?AFG;?S«!t A LQzL€bkL‚[b`i~;?D[~QD>;?
DV=A^;?EFjQO<s`O;FjDXw;EP«!t"A L<e;r‡D<O<FjDAFG;?89k;?qL‚[«q
«!t Aq!t"!A+†iD<Qp[D=sEj_;FjDO9s;?AFG;?EP8
<e;r‡D<O<FjDO<=;<9k;?q•Pi«Xq•«AAq#AASPr<…<M?Qn=D`D
O<=;<²«#AA
Bảng 3.3
Các thông số tính toán cho song chắn rác
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g‡D<O<FjDLs;?D<“;
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Ls;?D<“;tA L
!t ¯!t/
o;O<lO`_EdDD<s_<y_tAA !
Hình 3.1 ‹Gb•D\;?;?<]<]O<~;?q€E‡;FjDO<zQq‡;?<Q]_D<WXQW;O<YDZ;
;[\QO\As;?Q]_
Kích thước song chắn rác
N;< # –`D<X~O9‡Ls;?D<“;9`DO9s;?AFG;?
QzL€Ls;?D<“;9`DD@;O<=;<tS†ir<…<MA«;§
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?Qn=D`DO<=;<E^Q;<FL=[8
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Tổn thất áp lực qua song chắn
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3.3.2 Hầm bơm tiếp nhận:
<aO‡D<<:AXGAOQW_;<†;8
Trong đó : t là thời gian lưu nước, t = 10÷ 30 phút, chọn t = 15 phút.
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XGAOQW_;<†;EP8
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3.3.3 Bể điều hòa
Xác định thể tích bể điều hòa
3.3.3.1 Thể tích tích lũy
<aO‡D<O‡D<Eui•R;?SPQDV=?QcO<YQbFvDq`Db};<O<…sD\;?O<YD8
9s;?b@8
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3.3.3.2 Thể tích bể điều hòa
<aO‡D<XabQp[<R=D@O<aO‡;<Xˆ;?<=QD`D<8
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5
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