Sewage Treatment and Biogas

Name: Sewage Treatment and Biogas
Author: StemPy Lab

Where the water of a city goes after the drain, and how microbes clean it. The steps of primary and secondary treatment, flocs and activated sludge, and what BOD tells us about water. Then the gobar gas plant, where methane making bacteria turn dung into fuel. Python does the arithmetic of oxygen and gas.

3 lessons, about 1 h 20 min3 simulations10 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 25 min
Sewage and its primary treatment
The used water of a town is called sewage. It holds a great deal of organic matter and many germs, so it is treated before it goes back to a river. Primary treatment is physical: bars hold back the floating debris, the grit settles, and the solids that settle make the primary sludge.
1 simulation1 practice question1 Python program3 problems
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Lesson 2about 30 min
Secondary treatment, flocs and BOD
In secondary treatment, the effluent goes into aeration tanks where air is pumped in and aerobic microbes grow as flocs. They use up the organic matter and lower the BOD. The flocs settle as activated sludge. A small part goes back as inoculum, and the rest goes to the anaerobic sludge digesters.
1 simulation1 practice question1 Python program4 problems1 Python lab
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Lesson 3about 25 min
Biogas and the gobar gas plant
Biogas is a mixture of gases, mostly methane, that microbes make from organic waste without oxygen. The microbes are methanogens such as Methanobacterium. They live in the rumen of cattle, so dung is rich in them. A gobar gas plant turns dung into fuel, and the spent slurry is used as fertiliser.
1 simulation1 practice question1 Python program3 problems1 Python lab1 question set1 note
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Sewage Treatment and Biogas: Timed Test

20 questions · 15 min

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Sewage Treatment and Biogas

Course outline (3 lessons)

Sewage and its primary treatment

Secondary treatment, flocs and BOD

Biogas and the gobar gas plant

Test Your Learning

Your teacher

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