ENVIRONMENTAL ENGINEERING : Waste water characteristics Notes

By Deepanshu Rastogi|Updated : April 19th, 2021

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

WASTE WATER CHARACTERISTICS

 

 Aerobic Decomposition

(i) Nitrogenous organic matter

 byjusexamprep

 

(ii) Carbonaceous organic matter

 byjusexamprep

(iii) Sulphurous organic matter

   byjusexamprep

 Nitrogen Cycle under Aerobic Decomposition

 byjusexamprep

Anaerobic Decomposition

(i) Nitrogenous organic matter

  byjusexamprep

(ii) Carbonaceous organic matter

 byjusexamprep

(iii) Sulphurous organic matter

 byjusexamprep

(iv) Organic acids

 byjusexamprep

Threshold Odour Number (TON)

  byjusexamprep

  The volume of the sewage

 The volume of distilled water or odourless water.

 

Chemical Oxygen Demand

 (i) Biodegradable + non Biodegrable O.M.

 (ii) byjusexamprep added and used is measured.

Theoretical Oxygen Demand

  byjusexamprep

 byjusexamprep

 Benzene

 byjusexamprep

 Glucose

 Biochemical Oxygen Demand

 byjusexamprep

 Where,

Biochemical oxygen demand in ppm or mg/lit.

Initial dissolved oxygen in mg/lit.

Final dissolved oxygen in mg/lit.

  •  byjusexamprep
  • byjusexamprep

 

(i)  byjusexamprep

 Where,

k = Rate constant signifying the rate of oxidation of organic matter and it depends upon the nature of organic matter and temperature. Its unit is per day.

 byjusexamprep  the equivalent of organic matter present after t days.

(ii)  byjusexamprep

 Where,

 byjusexamprep Deoxygenation constant.

 byjusexamprep Organic matter present at  

(iii)  byjusexamprep

(iv)  byjusexamprep

 Where,

 byjusexamprepThe total amount of organic matter oxidized int days i.e. BOD.

(v) byjusexamprep

(vi)  byjusexamprep

 Where,

 byjusexamprep Ultimate B.O.D of byjusexamprep days.

(vii)  

 byjusexamprep

byjusexamprep

 byjusexamprep

byjusexamprep

(viii) Laboratory Estimations of  and L values

 (Thomas Method)

byjusexamprep  

byjusexamprep

  Where,

 m = Slope of the line

 C = Intercept of the line on the y-axis.

 byjusexamprep 

 Relative Stability (s)

 byjusexamprep

 Where

 byjusexamprep time in days at 20oC.

 byjusexamprep time in days at 37oC.

 

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