Correct option is C
Introduction:
- BOD curve in lake water follows 1st order kinetics:
- The BOD (Biochemical Oxygen Demand) curve is modeled using first-order kinetics because the rate of oxygen consumption by microorganisms is proportional to the remaining organic matter.
Information Booster:
- BOD Process:
- Measures the amount of dissolved oxygen required to decompose organic matter.
- A critical parameter in assessing water pollution.
- Ultimate BOD increases in direct proportion to the concentration of degradable organic matter:
- Ultimate BOD reflects the total oxygen demand of organic matter over time. More degradable organic matter leads to a higher ultimate BOD.
- Oxygen depletion in lake water is related to both ultimate BOD and the rate constant (R):
- The rate of oxygen depletion depends on the ultimate BOD and the decay rate constant, which defines the speed of decomposition.
Additional knowledge:
- Numerical value of the BOD rate constant does not depend on water temperature:
- This is incorrect because the rate constant for BOD is temperature-dependent. A higher temperature increases microbial activity, leading to a higher rate constant.
- Numerical value of the BOD rate constant does not depend on the nature of the waste:
- The rate constant depends on the nature of the organic waste, as different materials decompose at varying rates.
- BOD First-Order Kinetics:
- The oxygen consumption rate is proportional to the organic matter remaining, modeled by the equation:
- BODt=BODu (1−e−kt)
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