lagoon math ceu

7/27/2019 Lagoon Math Ceu

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Lagoon System M;ath - EUProblemsAnswer Key

The Division o Water Qualitymakes no claim as the accuracy o

any answers provided herein


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W Chapter 13 WASTE TREATMENI PONDS 35

Chapter 13 Achievement Test1. TheBOD concentrationofthe wastewaterenteringapondis190 mg/L. Iftheflowtothe pondis360,000gpd,howmanyIbs/dayBOD enterthe pond?

ANS 51-0 CJ5

2. A8.S-acrepondreceivesaflow of280,000gpd. I f the influentflow has aBODcontentof240 mg/L whatisthe organicloadingrate in lbs/day/aconthepond?

01..-1 2... =

cSCut-COVl \ 2.3. TheBOD enteringawastetreatmentpondis210mg/L. I f theBOD concentrationinthepondeffluentis 43 mg/L what is theBODremoval efficiencyofthepond?

2.l0 ,:,fL - 43> ~ 100 f2.. ,0 VV )::J L

ANS ~


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236 WB hapter 13 WASTE TREATMENI PONDS

4. A 22-acre pond receives aflow of 3.6 acre-feet/day. What is the hydraulic loading onthe pond n in./day?=... < CA.

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\V \vH U, Q . \ r. ole. ANS 2 0 d ' f

\ Lit.;=: 2....0 .< VJVj5. The BOD entering a waste treatment pond s 162 mg/L. the BOD concentration inthe pond effiuent is 71 mg/L what is the BOD removal efficiency of the pond?

r ( . \ _Go \ Ct r./)

l Sec..Alo V IANS 5{P

6. The flow to.a waste treatment pond is 200 gpm. the BOD concentration of the water is218 mg/L how many pounds of BOD are applied t the pond daily?L. 1 - WI 4 ......= ICl vJ = 0 0 ' . v () ~ . . . , L or::;;. '( _

1,0DO, Q.oC)

LO(:.AcA ::


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W Chapter 3 W STE TRE TMENT PONDS 237

Chapter 13-Achievement Test-Cont'd7. The flow to apond is 75,000 gpd with a BOD content of 138 mg/L The pond has anaverage width of 230 ft and an average length of 390 ft. What is the organic loading

rate in Ibs/day/ac on the pond?"2."?;p +\- . .3.9..CLf'-+:>, ' )&0 '" zr I ~ . L )

C o ~ 4 l \ : : ~ , ~ / l . - ) (C).o :t51- \GI))\6:;,Lco'ci :: ~ ~ dc..l I b 5 .0 ( . . . .

~ 6 ( : . . - ~ ~ NS 41. \ d u . {OLR.. = 2.., I v(..OL-l'" \b":'-""CA.L 1


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38 WB Chapter 13 WASTE TREATMENI PONDS

10. A waste treatment pond has a total volume o 18.2 ac-ft. the flow to the pond is0.51 ac-ft/day what is the detention time of the pond in days?

~ I o v v ::' Q.S\ oA_f Co)\'6. - . .(4DT ' o . ~ 1 ,

11. A 0.7-MGDwastewater flow has a BOD concentration of2840 mg/L. Using anaverage of 0.2Ibs/day BOD/person what is the population equivalent o thiswastewater flow?'Z5 31.-1 l LtlsLl 0 ',5' L < 0. :1- fv'\ G> \

~ _ . \ (gJ 5

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