Question

A) what is the difference between BOD vs COD and sBOD vs sCOD ?

B) Explain the application of using TBOD, sBOD, sCOD and TCOD.

C) which measurement should be used to evaluate or make sure that the process is working properly: i) Primary treatment ii) Secondary treatment with clarifier iii) secondary treatment with membrance

Answer 1

A) BOD vs COD

BOD or Biochemical Oxygen demand is the measure of the amount of oxygen required by the microorganisms to break down the organic matter in a sample of water.

COD or Chemical Oxygen Demand is the measure of the amount of oxygen required for the chemical oxidation of organic matter in a sample of water.

sBOD vs sCOD

sBOD or Soluble Biochemical Oxygen Demand is the measure of the dissolved food for the microorganisms in a sample of water.

sCOD or Soluble Chemical Oxygen Demand is the measure of oxygen required fir chemical oxidation of dissolved or soluble organic matter in a sample of water.

B)TBOD - The measure of Total Biochemical Oxygen Demand is used to make sure that the condition of a water body is safe for the organisms in it.

TCOD - This helps in analysing the effect of the discharged wastewater on the amount of dissolved oxygen in a water body.

sBOD - Soluble Biochemical Oxygen Demand measurement helps to determine the quality of water due to the amount of dissolved organic matter in it.

sCOD - This measurement helps in the analysis of dissolved organic matter for water treatment processes.

C)i) Primary treatment - Primart treatment involves settlement , grit removal and removal of solid waste .The water becomes clearer and may have dissolved organic waste so , COD and BOD results may be calculated.

ii) Secondary treatment with clarifier - This process involves removal of the microorganisms dissolved in the water so , DO should be calculated.

iii) Secondary treatment with membrane - This process involves filtration so solid wastes are separated so , the calculation of sCOD and sBOD should be done because the water has dissolved organic matter in it.

I hope I was able to answer your question, if you have any doubts ,let me know in the comment section.

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