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Authoritative PPT Summary
"Environmental Issues and Our Actions" Environment and Us PPT Courseware
Key points of this lesson
The current prominent environmental problems include air pollution, white pollution, the accelerated rate of species extinction, etc. Human beings are focusing on corresponding environmental protection actions.
1. Fill in the blanks.
1. The increase in carbon dioxide concentration in the atmosphere causes the earth’s surface temperature to _________.
2. Human beings consume fossil fuels, such as coal ______, __________, etc.
3. Acid rain is mainly caused by ____________________.
4. The tap water source in most areas comes from ________, ________ or ________.
5. Tap water is the main _______, and swimming is prohibited in ____________.
6. At present, sewage mainly includes ____________, _____________, __________, etc.
7. We can use _________, __________ and other methods to separate impurities in sewage.
Q&A
1. Sewage treatment is generally strict, and every step is important. Please read P83 and write down several important steps in sewage treatment.
Answer: (1) Preliminary treatment: When the wastewater flows through the treatment equipment, the flow rate slows down and the larger solids settle down. When the water passes through the sedimentation tank, the smaller particles sink to the bottom to form slime.
(2) Reprocessing: In the trickle filtration system, wastewater is filtered through gravel, and a layer of bacteria can also be spread on the surface of the gravel to decompose waste in the sewage.
(3) Additional treatment: The water is discharged into an open pond, where it is naturally purified by sunlight and air, and pure water vapor is formed after entering the atmosphere. Chlorine is generally added before the treated water is discharged again.
2. Why should we pay special attention to the source of tap water? Where should we start to protect tap water sources?
Answer: Because whether the drinking water is clean directly affects people's health.
We should protect water sources from the following aspects:
1. Do not discard waste in water source protection areas such as reservoirs;
2. Do not swim or wash in water source protection areas;
3. Do not damage vegetation related to water source protection areas.
4. Do not dump waste residue, garbage, feces and other waste into waters;
5. No pesticides, explosives or poisons are used to kill fish;
6. If pollution is discovered, report it to the environmental protection department in a timely manner.
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