Question 2: What are the types and characteristics of land pollution? We focus on waste gas purification, reuse of cutting fluid and cleaning fluid for metal processing, and disposal of discharged waste liquid. Soil pollution refers to the phenomenon that harmful and toxic substances produced by human activities enter the soil and accumulate to a certain extent, exceeding the self-purification ability of the soil itself, resulting in changes in the shape and quality of the soil, which constitutes an impact and harm to crops and the human body. Characteristics of land pollution: the phenomenon and process that the original physical and chemical properties of soil are polluted by the invasion of mining or industrial wastes or agricultural chemicals, which reduces the land production potential, deteriorates the product quality and causes harm to human beings, animals and plants. According to the different pollution sources, it can be divided into four categories: industrial pollution, transportation pollution, agricultural pollution and domestic pollution. Industrial pollution mainly refers to the pollution of air, water and soil by industrial waste residue, waste water and waste gas.
Types of land pollution: dust, sulfur dioxide and carbon monoxide are the main air pollutants discharged by industry, accounting for about 3/4 of the total air pollutants; Industrial wastewater discharged into rivers, lakes and oceans has become the main source of water pollution. Sewage directly seeps into soil or is used in farmland, which will pollute soil and agricultural products. Industrial waste residue not only occupies a large space, but also contains harmful components, which will cause soil pollution and water pollution after being dissolved in water. With the more frequent movement of various vehicles, the exhaust gas emitted by them has become an important pollution source of the atmosphere and water.
Question 3: What are the sources of land pollution? 1, industrial pollution source, 2, agricultural pollution source, 3, biological pollution source.
Question 4: What is soil pollution? What kinds of soil pollutants are there? Hello, landlord. When a large number of harmful substances are discharged into the soil, which exceeds its self-purification ability, it will cause changes in the composition, structure and function of the soil, inhibit the activities of microorganisms, gradually accumulate harmful substances or their decomposition products in the soil, and be indirectly absorbed by the human body through "soil-plant-human body" or "soil-water-human body", thus reaching the degree of endangering human health. This is soil pollution. Soil pollutants can generally be divided into three categories. (1) pathogens mainly come from human and animal feces, garbage, domestic sewage, hospital sewage and industrial wastewater containing pathogens. Any human and animal excrement and sewage without harmless treatment is directly used for irrigation or fertilization, and its sediments will pollute the soil with pathogens. Intestinal bacteria that can pollute soil include Salmonella, Shigella, Typhoid Bacillus and Vibrio cholerae. Clostridium tetanus also exists in natural soil and can survive in soil for a long time. In addition, soil is an important place for the growth and development of eggs or larvae. They can survive for a long time under certain conditions, for example, ascaris eggs can survive for more than 2 years in wet soil. Rmhot/... 1 (2) Toxic substances mainly include: heavy metal elements, such as aluminum, lead and zinc. Pesticides, the most harmful are organophosphorus pesticides, organochlorine pesticides and some metal-containing fertilizers; Carcinogenic substances such as benzopyrene. (3) The nuclear explosion of radioactive substances can produce radioactive elements with a long half-life. The half-life of strontium -90 is 28 years, and that of cesium-137 is 30 years. Both of them can accumulate in the soil and pollute the soil for a long time.
Question 5: What is the main source of soil pollution? There are many ways of soil pollution, which are closely related to the sources of pollutants. Generally speaking, soil pollutants include organic pollutants, inorganic pollutants, radioactive pollutants, solid wastes and pathogenic microorganisms. But judging from the way they enter the soil, they are probably the following. 1, water pollution. Usually sewage irrigation, or polluted surface water, then enters the soil. 2. Air pollution. Particulate dust such as PM 2.5, PM 10 or PM 50 in the atmosphere will eventually settle on the soil. 3. Agricultural pollution. In the process of fertilization, pesticides, garbage fertilizers, unclean compost, soil additives, etc. All the used ones will enter the soil and cause pollution. This is an important cause of soil pollution in the whole farmland. 4. Pollution from industrial enterprises. Waste gas, waste water and waste residue discharged by industrial and mining enterprises are the main causes of soil pollution around. Various solid wastes, such as tailings and hazardous wastes, accumulate, which leads to the pollution of the surrounding soil. Facing the grim situation of soil environment, the country is or will take a series of measures to strengthen soil environmental protection and pollution control, and resolutely declare war on soil pollution.
Question 6: What are the main types of soil pollutants? The types of soil pollution mainly include:
⑴ Organic matters and pesticides: Organic matters that usually cause soil pollution include phenol, oil, polychlorinated biphenyls and benzopyrene. Pesticides are mainly organochlorine (HCH, DDT, aldrin, dieldrin, etc. ); Organophosphorus (malathion, parathion, dichlorvos); Carbamates (pesticides, herbicides); Phenoxycarboxylic acids (herbicides, such as 2,4-d, 2,4,5-t).
⑵ Heavy metal pollutants: mainly mercury, cadmium, lead, chromium, copper, zinc, nickel and arsenic. The main ways of pollution are sewage irrigation, sludge fertilization, waste residue stacking and atmospheric dust fall.
(3) Radioactive substances: nuclear explosion fallout and nuclear power plant waste, which seep into the soil through rainfall.
⑷ Fertilizer: A large number of fertilizers containing nitrogen and phosphorus were used, which changed the physical and chemical properties of soil. In severe cases, it affects crop growth and leads to the degradation of agricultural products.
5. Pathogenic microorganisms: Pathogenic microorganisms in soil mainly come from human and animal feces and sewage generated by irrigation (untreated domestic sewage and hospital sewage).
(6) Construction wastes and agricultural wastes: lime, cement, paints, plastics, bricks, stones, etc. Such as fil or piling into farmland to pollute soil.
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Question 7: What are the top ten environmental pollution in the world? What are the top ten environmental pollution in the world? Global 10 environmental problems
1, climate warming
2. Ozone layer destruction
3. Loss of biodiversity
4, acid sea spread
5. The forest area has decreased sharply.
6. Land desertification
7. Air pollution
8. Water pollution
9. Marine pollution
10, solid waste pollution
(1) global warming and sea level rise (2) serious soil erosion and reduction of cultivated land area (3) reduction of forest resources (4) water shortage restricts development and affects life (5) ozone layer destruction threatens life on earth (6) accelerated extinction of biological species and sharp decline of biological resources (7) human explosion endangers natural ecology (8) transfer of harmful artificial compounds (9)
Question 8: What are the hazards of soil pollution? 1. Soil pollution leads to serious direct economic losses, crop pollution and yield reduction. At present, there is a lack of systematic survey data on economic losses caused by various soil pollution. Taking soil heavy metal pollution as an example, the national grain production is reduced by100000 tons every year, and the grain contaminated by heavy metals is as high as120000 tons every year, resulting in a total economic loss of at least 20 billion yuan.
2. Soil pollution leads to the continuous decline of biological quality. The soil in the suburbs of most cities in China has been polluted to varying degrees. In many places, the contents of heavy metals such as cadmium, chromium, arsenic and lead in grain, vegetables, fruits and other foods exceed the standard and are close to the critical value.
Soil pollution not only affects the hygienic quality of food, but also obviously affects other qualities of crops. In some areas, sewage irrigation makes vegetables taste worse, easy to rot, and even give off an unpleasant smell; The storage quality and processing quality of agricultural products can not meet the requirements of deep processing.
3. Soil pollution is harmful to human health. Soil pollution will accumulate pollutants in plants (crops) and enrich them into people and animals through the food chain, which will endanger the health of people and animals and cause diseases such as cancer.
4. Soil pollution leads to other environmental problems. After the land is polluted, the polluted topsoil with high concentration of heavy metals can easily enter the atmosphere and water under the action of wind and water, resulting in air pollution, surface water pollution, groundwater pollution, ecosystem degradation and other secondary ecological and environmental problems.
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Question 9: There are many sources and ways of soil pollution, which are closely related to the sources of pollutants. Generally speaking, soil pollutants include organic pollutants, inorganic pollutants, radioactive pollutants, solid wastes and pathogenic microorganisms. But judging from the way they enter the soil, they are probably the following.
1, water pollution. Usually sewage irrigation, or polluted surface water, then enters the soil. 2. Air pollution. Particulate dust such as PM 2.5, PM 10 or PM 50 in the atmosphere will eventually settle on the soil.
3. Agricultural pollution. In the process of fertilization, pesticides, garbage fertilizers, unclean compost, soil additives, etc. All the used ones will enter the soil and cause pollution. This is an important reason for the non-point source pollution of our entire farmland soil.
4. Pollution from industrial enterprises. Waste gas, waste water and waste residue discharged by industrial and mining enterprises are the main causes of soil pollution around. Various solid wastes, such as tailings and hazardous wastes, accumulate, which leads to the pollution of the surrounding soil.
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The dust blocking efficiency of the mask is based on its blocking efficiency for fine dust, especially for inhalable dust below 2.5 microns. Because dust with this particle size can directly enter alveoli, it has the greatest impact on human health. Gauze mask, its dustproof principle is mechanical filtration, that is, when dust collides with gauze, some large particles of dust in abrasive cloth will be blocked by layers of barriers. For some fine dust, especially dust smaller than 2.5 microns, it will enter the respiratory system through the mesh of gauze. Dust mask, its filter material is composed of activated carbon fiber felt pad or non-woven fabric, and those inhalable dust smaller than 2.5 microns pass through this filter material.
Question 10: Types of soil pollution What types of soil pollution are hidden and lagging behind? Problems such as air pollution, water pollution and garbage pollution are generally intuitive and can be found through the senses. On the other hand, soil pollution is usually determined by analyzing and testing soil samples and detecting crop residues, and even by studying the impact on human and animal health. So soil pollution usually lags behind for a long time from pollution to problems. For example, it took 10 ~ 20 years for the Japanese "pain disease" to be recognized. [1] 1. Cumulative pollutants are generally easier to migrate in the air and water than in the soil, which makes pollutants not as easy to diffuse and dilute in the soil as in the air and water. Therefore, it is easy to accumulate in the soil, and soil pollution has a strong regional nature. 2. The pollution of soil by irreversible heavy metals is basically an irreversible process, and the pollution of many organic chemicals takes a long time to degrade. For example, soil contaminated by some heavy metals may take 100 ~ 200 years to recover. 3. If the air and water are polluted, it will be difficult to control. After the pollution source is cut off, the pollution problem can be continuously reversed through dilution and self-purification, but it is difficult to eliminate the refractory pollutants accumulated in polluted soil through dilution and self-purification. Once soil pollution occurs, it is often difficult to recover only by cutting off the pollution source. Sometimes the problem can be solved by changing soil and washing soil, and other treatment technologies may be slow. Therefore, the cost of treating polluted soil is usually high and the treatment period is long. In view of the difficulty of soil pollution control and the obvious characteristics of concealment and lag, soil pollution is generally not easy to be taken seriously. High radiation and a large amount of radiation pollute the land, which makes the polluted land contain a toxic substance. This toxic substance will make plants unable to grow and stop growing! Burning leaves: leaves contain a toxic substance, which will not be emitted under normal circumstances. But once there is a fire, the poison will evaporate. People get poisoned as soon as they breathe. Wearing the Puwechat Tmall imported from the United States is very filterable.