Q/2: A city discharges 115000 m3/d of wastewater nto a stream whose minimum rate of flow is 8.5 m3/s. The velocity of the stream is about 3.2Km/hr, the temperature of the wastewater is 20 oC and that of the stream is 15 oC. The BOD5 at 20 oC of the wastewater is 200mg/l and that of the stream is 1mg/l. The wastewater contains no dissolved oxygen but the stream is 90% saturated upstream of the discharge.
Q/2: A city discharges 115000 m3/d of wastewater nto a stream whose minimum rate of flow is 8.5 m3/s. The velocity of the stream is about 3.2Km/hr, the temperature of the wastewater is 20 oC and that of the stream is 15 oC. The BOD5 at 20 oC of the wastewater is 200mg/l and that of the stream is 1mg/l. The wastewater contains no dissolved oxygen but the stream is 90% saturated upstream of the discharge.
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy
Section: Chapter Questions
Problem 14P
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Transcribed Image Text:Q/ 2: A city discharges 115000 m3/d of wastewater
into a stream whose minimum rate of flow is 8.5 m3/s.
The velocity of the stream is about 3.2Km/hr, the
temperature of the wastewater is 20 oC and that of
the stream is 15 oC. The BOD5 at 20 oC of the
wastewater is 200mg/l and that of the stream is 1mg/l.
The wastewater contains no dissolved oxygen but the
stream is 90% saturated upstream of the discharge.
At 20 oC k1 is estimated to be 0.3 day-1, and k2 is 0.7
day-1. Determine the critical oxygen deficit and its
location, also estimate BOD5 at 20 oC of the sample
taken at the critical point. Use temperature coefficient
of 1.135 for k1 and 1.025 for k2, also plot the dissolved
oxygen sag curve
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