ed sludge system treats wastewater from an industry with a flow rate of 10 y. The BOD of the raw wastewater is 1200 mg/L and after treatment, the be reduced to 50 mg/L. Pilot plant studies showed that this can be achieved ids Retention Time (SRT) of 5 days and MLSS of 5000 mg/L. Y and ką 0.7 and 0.03 per day respectively. olume of reactor

Structural Analysis
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Chapter2: Loads On Structures
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Wasterwater Engineering Civil engineering 

22. An activated sludge system treats wastewater from an industry with a flow rate of 10
000 m²/day. The BOD of the raw wastewater is 1200 mg/L and after treatment, the
BOD is to be reduced to 50 mg/L. Pilot plant studies showed that this can be achieved
with a Solids Retention Time (SRT) of 5 days and MLSS of 5000 mg/L. Y and ka
values are 0.7 and 0.03 per day respectively.
Calculate:
(i)
Volume of reactor
(ii)
Biomass wasted daily
(iii) F/M ratio.
Transcribed Image Text:22. An activated sludge system treats wastewater from an industry with a flow rate of 10 000 m²/day. The BOD of the raw wastewater is 1200 mg/L and after treatment, the BOD is to be reduced to 50 mg/L. Pilot plant studies showed that this can be achieved with a Solids Retention Time (SRT) of 5 days and MLSS of 5000 mg/L. Y and ka values are 0.7 and 0.03 per day respectively. Calculate: (i) Volume of reactor (ii) Biomass wasted daily (iii) F/M ratio.
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