1 Using the flowra te data presented below determine the vol

1. Using the flowra te data presented below, determine the volume of an equalization tank and determine the effect of equalization on the hourly BOD concentration. Time Period Avg. flowrate during the time period, mis Avg BOD concentration during the time period, mg/L 150 115 1:002:00 2:003:00 3:004:00 4:005:00 5:006:00 6:00 7:00 7:008:00 8:009:00 9:0010:00 10:00 11:00 11:00 12:00 12:00 13:00 13:00 14:00 14:00 15:00 15:00 16:00 16:00 17-00 17:00 18:00 18:00 19:00 19:00 20:00 20:00 21:00 21:00 22:00 22:00 23:00 23:00 0:00 0.180 0.160 0.160 0.185 175 0.480 190 180 0.331 0.315 0.320 0.346 0.392 0.360 180

Solution

FROM TABLE WE CAN SEE

VOLUME = 471.66 m³ = 471660 L

and equalization BOD= 187.13 mg/L

if we compare with hourly BOD it is more for first 9 hours BOD but less for Remaining BOD 16-19 and 24 hours

time past 00 hr	flow rate	BOD Mg/L	Total flow m^3	Total flow L	Bod mg
1	0.300	150	18.000	18000	2700000
2	0.220	115	13.200	13200	1518000
3	0.180	75	10.800	10800	810000
4	0.160	50	9.600	9600	480000
5	0.160	45	9.600	9600	432000
6	0.185	60	11.100	11100	666000
7	0.240	90	14.400	14400	1296000
8	0.300	130	18.000	18000	2340000
9	0.385	175	23.100	23100	4042500
10	0.440	200	26.400	26400	5280000
11	0.480	215	28.800	28800	6192000
12	0.480	220	28.800	28800	6336000
13	0.460	220	27.600	27600	6072000
14	0.420	210	25.200	25200	5292000
15	0.390	200	23.400	23400	4680000
16	0.355	190	21.300	21300	4047000
17	0.311	180	18.660	18660	3358800
18	0.315	170	18.900	18900	3213000
19	0.320	175	19.200	19200	3360000
20	0.346	210	20.760	20760	4359600
21	0.362	280	21.720	21720	6081600
22	0.392	305	23.520	23520	7173600
23	0.360	245	21.600	21600	5292000
24	0.300	180	18.000	18000	3240000
Total			471.66	471660	88262100
		average BOD = Total BOD/T.VOL (mg/L)		187.1307722