BOD (biological oxygen demand) - The water quality indicator

3 Minute Water and Waste Water Video Tutorials by AET
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BOD - Biological oxygen demand is the most important used assessment to determine water quality.
Its a measurement unit and stands for the needed amount of oxygen by aerobic biological organisms to break down organic matter.
COD in comparison stands only for everything that can be chemically oxidized and is therefore less specific.
The biochemical process of BOD removal can be described with the equation:
Organic matter + O2 is converted into Co2 + H20
As higher the degree of water pollution as more organic matter is present and as more Oxygen is needed for the oxidization, hence, as higher is the BOD level.
The most commonly laboratory test method used is called the BOD5 test. For this testing method one liter of waste water is filled into a testing bottle and the consumed oxygen during 5 days of incubation is measured. The test method uses 5 days of incubation time as after 5 days most organic material has already been degraded.
The test sample is continuously agitated under the absence of light and a sensor measures the decline of pressure caused by oxygen consumption.
Typical values for BOD levels are 2 to 8mg/l in moderately polluted rivers. In comparison untreated sewage in the US has a BOD level of about 300mg/l whereas European sewage averages around 600mg/l. The lower BOD level in the US are caused by a greater water use per capita.
Waste water treatment plants use different technologies to increase BOD removal significantly. One common method is to increase the amount of biological organisms by providing more surface area for attached growth. Fill media plastic blocks consists of corrugated sheets and ensure a good water and air mixing to supply the biological organisms with nutrients and oxygen. Each fill media block can provide up to 250 m2 surface area for attached growth!

[@maxzhang8612]

Yes, now there are a lot of water quality testing equipment can detect the content of BOD, and a lot of factories in the discharge of sewage need the corresponding professional equipment to detect.

[@kartikrchavan]

We are into manufacturing of afore mentioned "Microorganisms" and still it was an informative video. Thanks!

[@materialsandtechnology8956]

BOD analysis using oxitop
czcams.com/video/hqr6C6v7DT4/video.html

[@Lilliz91]

Wish there would be more detail about how to calculate it with seeded blank of dissolved oxygen.

[@bitaalfool]

very nice.. short and useful

[@fatimabitar9796]

The agitation of the sample is done within the 5 days of incubation ???
and thank you :)

[@englishstudymasumahmed7565]

Awesome video for understanding, Thanks very much from Bangladesh.

[@karl-uweschmitz3028]

Thanks for your support Masum! If you have a wastewater topic or question that bothers you let us know and we might make a video tutorial about that specific topic.

[@BlackTriceratops]

@@karl-uweschmitz3028 Hello sir, I am learning environmental engineering and it would be great if you could help me with a question. What does P₁ & Lu mean in relation to the Biochemical Oxygen Demand curve?

[@waleednassar5648]

Amazing 👏

[@sandy_speaks]

Thanks
you elaborated very well 👍

[@karl-uweschmitz3028]

Thanks Akshay! Let us know if you have a particular topic that we should prepare a tutorial for

[@sandy_speaks]

@@karl-uweschmitz3028 please describe "waterspout"

[@muhammadsaadifrahimkhan5569]

Excellent.

[@karl-uweschmitz3028]

Thanks Muhammad!

[@maramabbas370]

good

[@yashdaks135]

It's so good sir

[@futurematerialsandtech5766]

czcams.com/video/hqr6C6v7DT4/video.html

[@elainelimas5544]

What are the two major factors that affect the rate of biochemical oxidation in the BOD test?

[@oracleboi1933]

Lmao did you pass your exam?

[@Shashin2023]

Nice lecture i like this

[@karl-uweschmitz3028]

Glad to hear that

[@babuishac7742]

BOD-BIO CHEMICAL OXYGEN DRMAND

[@futurematerialsandtech5766]

czcams.com/video/hqr6C6v7DT4/video.html

[@abdulfitra3771]

anyone can tell me what is BODinfluent and BODeffluent?

[@karl-uweschmitz3028]

Influent is the incoming flow and effluent is the outgoing flow

[@karlschmitz5271]

Excellent explanation within 3 minutes!