#Question id: 14268
#SCPH05 I Biotechnology
An activated-sludge waste treatment system is required to reduce the amount of BOD5 from 1000 mg/l to 20 mg/l at the exit. The sedimentation unit concentrates biomass by a factor of 3. Kinetic parameters are µm = 0.2 h-1 , Ks = 80 mg/l, kd = 0.01 h-1 , and Y M X/S = 0.5 g MLVSS/g BOD5. The flow of waste water is 10000 l/h and the size of the treatment basin is 50,000 l. What is the value of the solids residence time?
#Question id: 416
#SCPH28 | Zoology
The immediate precursors of DNA and RNA synthesis in the cell all contain:
#Question id: 11674
#I Life Science/ Life Sciences Group – I-V
If ATP production in a human kidney was suddenly halted, urine production would:
#Question id: 355
#SCPH28 | Zoology
Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?
#Question id: 613
#SCPH05 I Biotechnology
Ethanol (CH3CH2OH) is the alcohol found in beverages. It is oxidized in the body to acetaldehyde by the enzyme alcohol dehydrogenase. Methanol (CH3OH), also known as wood alcohol, is converted to formaldehyde by the same enzyme. Acetaldehyde is toxic, but formaldehyde is far more toxic to humans, which is why the ingestion of relatively small amounts of methanol can cause blindness or death. One treatment for mild methanol poisoning is the administration of ethanol. Why might a doctor choose this treatment?