"Discharge of Human Waste" PPT Courseware

Description

"Discharge of Human Waste" PPT Courseware

Part One: Introduction of New Course

Why does the human body have to expel waste products from the body? Do waste products excreted by the human body need to be treated before being released into the environment?

learning target

1. Pay attention to the disposal of waste products excreted by the human body.

2. List the resource value of human waste and the hazards of improper handling.

PPT on the discharge of waste from the human body, Part 2: Treatment of waste discharged from the human body

Why do we need to treat human feces and urine?

Purpose: To state the reasons for the disposal of human feces and urine.

guide:

1. If a person excretes 2kg of feces and urine every day as a base, calculate the amount of feces and urine excreted by teachers and students of this school in a year. Discuss and analyze how much feces and urine are discharged into the environment by our residents every year?

The amount of feces and urine excreted by the school in one year = 2 × the number of teachers and students in the school × 365

2. According to analysis, how many substances are contained in human feces and urine (table below). Discussion and What are the possible uses of the various substances in human feces and urine?

In addition to a large amount of water, human feces and urine also contain a certain amount of organic matter. These organic matter can be converted into various inorganic salts such as nitrogen, phosphorus and potassium through the decomposition of certain organisms. These inorganic salts provide energy for plant growth.

3. Students work in groups of 6 to design an investigation plan to investigate the treatment methods of local people’s excrement and urine.

4. After investigation, analyze the advantages and disadvantages of local methods for dealing with human feces and urine.

5. Share the survey results with the whole class. Discuss and put forward suggestions for improving the treatment methods of human feces and urine, and submit them to the local environmental protection department.

PPT on the discharge of human waste, part three: discussion

What impact will improper disposal of human waste have on our health?

Human feces and urine contain a certain amount of pathogenic microorganisms. If they are discharged into water bodies without treatment, they will pollute the water environment; if they are discharged into the soil, they will pollute the soil environment. Pathogenic microorganisms contained in human feces and urine can infect the human body through water or soil, causing disease.

How to deal with human feces and urine in order to turn harm into benefit and "waste" into treasure?

Farmers in our country have had experience in applying processed human excrement and livestock excrement (farmyard manure) on farmland since ancient times. This has played a role in continuously obtaining harvests from farmland and maintaining the production capacity of farmland for thousands of years. important role.

Compared with chemical fertilizers, farmyard manure has the advantages of wide sources, complete nutrients, long-lasting fertilizer effect, ability to improve soil and low cost.

PPT on the discharge of human waste, part 4: feedback in class

1. Compared with chemical fertilizers, farmyard manure has the following advantages: ()

① Low cost ② Long-lasting fertilizer effect ③ Quick effect ④ Wide source ⑤ Complete nutrients

A． ①④⑤ B. ①②④⑤

C． ①②⑤ D. ①②③④⑤

2. Improper disposal of human waste will have an impact on our human body and the environment. Which of the following is incorrect ()

A． Discharge of human feces into the water environment will pollute the water body

B. Human feces and urine are effective as fertilizers, so it is best to apply fertilizer directly

C． Human feces and urine can produce biogas, which can both purify the environment and be used as energy

D. Human feces and urine sometimes indirectly cause infectious diseases in humans and animals

PPT on the discharge of human waste, part five: expansion and extension

What other methods do you know about the harmless disposal of human feces and urine?

1. Biogas pool

In some areas, human feces and urine are used as raw materials in biogas digesters, which can not only purify the environment, but the biogas produced can also be used as energy.

Biogas fermentation

Biogas fermentation refers to a technology in which organic matter is fermented by microorganisms under anaerobic conditions to generate combustible gas mainly methane.

Substances produced by biogas fermentation

1. Biogas: Mainly methane, it is a clean energy source.

2. Biogas slurry: contains soluble N, P, and K and is a high-quality fertilizer.

3. Biogas residue: It is mainly bacteria, undecomposed organic residues and inorganic matter. It is also an excellent organic fertilizer and has the effect of improving soil.

2. High temperature composting

⑴It is to accumulate human excrement, livestock excrement, straw, etc., causing bacteria and fungi to multiply. Bacteria and fungi can decompose organic matter and release energy, forming high temperatures.

⑵ High-temperature composting is an important way to produce farm fertilizer.

⑶The high temperature formed during the high-temperature composting process can also kill various germs and insect eggs.

3. Eco toilet

⑴ There is a biogas pool underground, which can harmlessly treat human feces and urine on site. The generated biogas can be used as fuel, and the residue and residual liquid can be used as fertilizer for flowers, trees, or crops.

⑵The roof can be covered with soil for planting, water storage for breeding, or solar energy utilization devices can be installed.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware for the second volume free download, human body waste discharge PPT download, .PPT format;

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"Discharge of Human Waste" PPT:

"Excretion of Human Waste" PPT Part One Content: New Lesson Introduction We all excrete a certain amount of urine every day. Through urination, we excrete some waste and excess water from the body. What is the source of urine? How is urine formed? Learning Objectives 1. Overview..

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Update Time: 2024-06-29

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 2 industry PPT template

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