HW 5 Solutions

# HW 5 Solutions - 5'5' T he f ollowing d atah aveb eeno...

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@) 5'5' The following data have been obtained in a BoD test that is made to determine how well a wastewater treatment plant is operatrng: (A) what percentage of the BoD is being removed by this prant,? (B) If this is a secondary plantihat l, ,uppJr"d to remov e glohof the BoD, is it operating properly? h"h*f.,tr. tPl ' /tl 'r*'1" 10b.t tii'i*u< '3DD.rnhp^l-r,l = r- I I I t \-- U o Z.c s/3cc /1.o - 4.o ls /juo ?o l^€*or'I t Lr-1,J v^tl, \ ..-. ..-.\ Ioo rr3/._ ) \ \= \ Lq o -- lcro Iloc : ?qo r' -_-'-_.-_\ I Sr. 3 r)-* \, t------- I z) r-\ \K 1-l ./ t /C lt-( fla",I v) rfl,s\ frcgil-, (br@ 7, G /fd\- Initial DO (mdL) Volume wastewater dilution water (mL) Untreated hoio^*,^

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fI^ s, ? tlror,i : (ur; -.Dco 2 ,\_z ,*\ I t = E.o '*\$ /. - 6, -Bp )(r P\ P ' ',ls, P Do, - '\.2 *r/e_ Z.c ^"t/- bf ?,, 0x t b7 ('r.Z b,o ) Lt- '/s") \/ go 5' 10 A standard BoD test i: 3n using seeded dilution water. In one bottle, the waste sample is mixed with seeded dilution water giving a dilution of l:30. Another bottle, the blank' contains just seeded water. Both bottles begin the test with Do at the saturation value of 9 '2 mg/L'After five days, the bottle "ontlining *urt" has Do equal to 2.0 mglq ;'5[::t" containing seedei ilution water has Do-equar to 8.0 ^e/L.Find B, k
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HW 5 Solutions - 5'5' T he f ollowing d atah aveb eeno...

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