Skip to content

CivilNotePpt

  • Home
  • CONCRETE
  • Highway
  • Railway
  • WasteWater
  • BMC
    • Building Construction
    • Building Material
  • soil

Biochemical Oxygen Demand (B.O.D) And Their Test

Posted on 6th March 201928th June 2022 By Malay Sautya

Biochemical Oxygen Demand (B.O.D)

The amount of oxygen required to carry out the biological decomposition of dissolved solids in sewage under aerobic conditions at standard temperature is known as biochemical oxygen demand. 

It indicates the amount of biologically active organic matter present in the sewage. It is generally less than C.O.D.

The B.O.D of water during 5 days at 20 ° C is generally taken as the standard demand and it is about 68% of the total demand.

B.O.D Test

To determine the standard 5 day B.O.D in the laboratory, a known volume of sewage sample is mixed with a known volume of aerated pure water. The dissolved oxygen (D.O) of the diluted sample is then determined. 

The diluted sample is then incubated for 5 days at 20 ° C. The D.O of the sample after this period is again determined. The difference between the initial D.O and the final D.O gives the oxygen consumed by the sample in 5 days. The B.O.D is then calculated by using the following equation.

B.O.D OR B.O.D5 = ( D.O consumed by the test sample Х Dilution factor )
Where Dilution factor = Volume of diluted sample/Volume of undiluted sewage sample

Read Also:

Chemical Oxygen Demand (C.O.D) And Their Test

Laying Of Sewer 

Sludge Drying Bed

WasteWater, water

Post navigation

Previous Post: 4 Difference Between One And Two Pipe System
Next Post: 3 Difference Between Biochemical (B.O.D) and Chemical (C.O.D) Oxygen Demand

Related Posts

  • Determination of Quantity of Sanitary Sewage WasteWater
  • Chemical Oxygen Demand (C.O.D) And Their Test WasteWater
  • Factors Governing The Selection Of Sewer Pipe Materials WasteWater
  • Municipal Rules Regulation House Sewer Connection with The Street Main Sewer
    16 Municipal Rules Regulation For House Sewer Connection with The Street Main Sewer WasteWater
  • Water Carriage System And Their Advantages and Disadvantages WasteWater
  • Choice of The Separate Sewer System WasteWater
  • Method of Ventilation of House Drains System WasteWater
  • Difference Between Activated Sludge Process And Trickling Filter WasteWater
  • Partially Separate Sewer System And Their Advantages & Disadvantages WasteWater
  • Rainfall Intensity And Their Formula Irrigation Engineering

Categories

  • Highway engineering
  • Railway Engineering
  • BMC
  • WasteWater
  • soil
  • CONCRETE
  • Building Construction
  • Irrigation Engineering
  • Hydraulic Structure
  • water
  • Cement
  • Foundation Engineering
  • Aggregate
  • Mathematical Example
  • Tunnels
  • Survey Engineering
  • PAVEMENT DESIGN
  • Hydrology
  • PAVEMENT DESIGN – MCQ
  • Building Material
  • Floors
  • Highway Engineering – MCQ
  • HYDROLOGY M.C.Q
  • Engineering Geology – M.C.Q
  • Railway Engineering – MCQ
  • Water Supply – MCQ
  • Building Materials – MCQ
  • Soil Engineering – MCQ
  • Irrigation Engineering – MCQ

Popular Posts

  • 40+ Best Online Furniture Stores – Choose Your Best Option!
  • 10 Types of Roads Classification in India(Urban & Non-Urban Road)
  • 3 Characteristics of Sewage – Physical, Chemical and Biological Characteristics
  • TYPES OF RAILS – Double Headed, Bull Headed and Flat Footed Rails
  • 6 Types of Classification of Gradient – Ruling, Limiting, Exceptional, Minimum, Average and Floating Gradient
  • Railway Gauge – || Definition || Types || Factor Affecting || Advantages of Uniform Gauge ||
  • 8 Different Types of Cement Test || Building Materials & Construction
  • History of Road Development in India
  • 100+ All Traffic Signs or Road Safety Signs in India as per IRC
  • 5 Purposes of Providing Superelevation Highway engineering
  • Fixtures & Fastening in Railway - MCQ
    Fixtures & Fastening in Railway – MCQ || Railway Engineering || Railway Engineering
  • 5 Difference Between Pre-tensioning and Post-tensioning System CONCRETE
  • Chute Spillway Definition/About Chute Spillway Hydraulic Structure
  • 9 Effects of Dampness Building Construction
  • Object Of Sewage Treatment And Location of Plants WasteWater
  • Top 10 Tallest Buildings and Structures in Japan Building Construction
  • Determine the Discharge of the Channel for which it is to be Designed
    Determine the Discharge of the Channel for which it is to be Designed Irrigation Engineering

Primary Menu

  • Home
  • About us
  • Contact

Top Posts & Pages

  • 12 Basic Principles of Building Planning
  • World's Top 10 Countries Having Largest Railway Network 2022
  • 100+ All Traffic Signs or Road Safety Signs in India as per IRC
  • 19 Types Of Sewer According To Material And Place of Use
  • How To Calculate True Bearing From Magnetic Bearing - || Rules and Example||

Copyright © 2022 CivilNotePpt.

Powered by PressBook News WordPress theme