"Reactor Volume"...
"Excess Solids"... "Mass Balance"... |
1 - Influent flow-rate = 3,800 m^{3}/day | 10 - Concentration of settled sludge = 8,000 mg/L |
2 - Influent suspended solids = 200 mg/L | 11 - Settled sludge specific gravity = 1.02 |
3 - Influent VSS = 150 mg/L | 12 - 60 % of reactor volume will be decanted each day |
4 - Wastewater temperature = 20 °C | 13 - Liquid depth of SBR = 6.60 m |
5 - Hydraulic detention time = 24 h | 14 - Sludge wasting is done once a week |
6 - F/M = 0.1 kg BOD_{5}/kg MLVSS.day | 15 - 65 % of effluent is biodegradable |
7 - MLVSS/MLSS = 0.80 | 16 - BOD_{5} = 0.68 BOD_{L} |
8 - Y = 0.65 kg/kg | 17 - BOD_{L} of one mole cells = 1.42 times of X |
9 - k_{d} = 0.05 1/day | 18 - C : N : P is suitable |
Parameter | Result | |
Value | Unit | |
Influent parameters | ||
Population equivalent | 45,000 | pe |
Average daily flow | 11,500 | m^{3} / day |
Average daily flow | 133 | L / s |
Peaking factor | 1.80 | - |
Design flow | 863 | m^{3} / hr |
Design flow | 240 | L / s |
PWWF | 25,000 | m^{3} / day |
PWWF | 289 | L / s |
PWWF | 1,042 | m^{3} / hr |
BOD design load | 3,150 | kg / day |
Aeration tank | ||
F / M | 0.05 | kg BOD / kg MLSS . day |
MLSS concentration | 4,000 | mg / L |
Aeration volume required | 15,750 | m^{3} |
HRT @ avg flow | 32.9 | hr |
HRT @ design flow | 18.3 | hr |
Approximate tank size | ||
Depth | 4.0 | m |
Width | 35.0 | m |
Length | 112.5 | m |
Secondary clarifier | ||
SVI | 150 | g / mL |
Sludge volume load | 0.06 | m^{3} / m^{2} . day |
Surface area required | 8,625 | m^{2} |
Overflow rate | 0.10 | m^{3} / m^{2} . hr |
Diameter | 104.8 | m |
Average depth | 3.5 | m |
Volume | 30,188 | m^{3} |
HRT @ average flow | 6.3 | hr |
HRT @ design flow | 3.5 | hr |
Sludge handling | ||
Sludge production rate | 0.95 | kg TS / kg BOD |
Sludge production | 2,993 | kg TS / day |
Days storage in aeration tank | 2.6 | by incr. MLSS by 0.5 kg / m^{3} . day |
Days storage in aeration tank | 5.3 | by incr. MLSS by 1.0 kg / m^{3} . day |
Volume @ 0.8 % | 374 | m^{3} / day |
HRT thickener | 18.0 | day |
Volume thickener | 6,733 | m^{3} |
Height | 4.0 | m |
Diameter | 46.3 | m |
HRT @ 2 % | 45 | hr |
Volume @ 3 % | 99.8 | m^{3} / day |
HRT | 67 | day |
Dewatering capacity | 15.0 | m^{3} / hr |
Dewatering duration | 46.6 | hr / week |
Dewatering volume @ 18 % | 16.6 | m^{3} |