What is the difference between biological and chemical contamination of animal food?

The main aquatic products are fish, lobster, crab, snail, mussel and other marine fish, some leftovers, humus in the main water body, and the bottom of the water is seriously polluted.

Chemical pollution: mainly refers to pesticides, veterinary drug residues, or industrial toxic and harmful chemical reagents.

Biological contamination: mainly pathogenic bacteria, parasites, viruses and other pollution.

One is inanimate (physicochemical) and the other is animate (living things, microorganisms), so to speak.

In addition, there is physical pollution: sand, mud, metal particles and other water-insoluble, acid-insoluble pollution, usually visible to the naked eye.

There is also heavy metal pollution: environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, exhaust gas emissions, sewage irrigation and the use of heavy metal products.

Biological contamination(biological pollution) is caused by various organisms that can cause human diseases.

Contamination of the environment (air, water, soil) and food caused by parasites, bacteria and viruses. Untreated domestic sewage, hospital sewage, factory wastewater, garbage and human and animal feces (as well as floating objects and aerosols in the atmosphere, etc.) are discharged into water or soil, which can increase the number of insect eggs, bacteria and pathogenic bacteria in the water and soil environment, and threaten human health. Bacteria and viruses in the polluted air, and food infected by mold or eggs will affect human health.

Eutrophication in bay red tides and lakes, overblooming of certain algae and other organisms. It is also a phenomenon of biological pollution of water bodies.

Life pollutionDomestic pollution refers to the improper disposal of domestic wastes such as feces, garbage, and sewage, that is, common domestic garbage pollutes the air, water, soil and its breeding mosquitoes and flies. With the continuous improvement of population growth and consumption level, the amount of domestic garbage has risen significantly, and the nature of garbage has also changed, such as the addition of plastics and other polymer compounds and other components in domestic garbage, which has increased the difficulty of harmless treatment. Manure can be used as fertilizer, but it can also cause the spread of certain diseases if not properly disposed of.

Biotic pollution

It refers to the direct or indirect infection or transmission of various diseases by pathogenic microorganisms after they are discharged into the water body. The main indicators are coliform index, total number of bacteria, etc.

Domestic sewage, especially hospital sewage and some industrial wastewater, can often bring in some pathogenic microorganisms after polluting water bodies. For example, some pathogenic bacteria that originally existed in the intestinal tract of humans and animals, such as typhoid fever, paratyphoid fever, cholera bacteria, etc., can enter the water body through the pollution of human and animal feces and spread with the flow of water. Some viruses, such as hepatitis virus and adenovirus, are also commonly found in contaminated water.

Certain parasitic diseases, such as amoebic dysentery, schistosomiasis, and leptospirosis, can also be transmitted by water. Preventing the pollution of water bodies by pathogenic microorganisms is also a major issue to protect the environment and protect human health.

What does food contamination involve?

1.Biological contamination.

Biological contamination of food includes microorganisms, parasites, insects and viruses. Microbial contamination mainly includes bacteria and bacterial toxins, molds and mycotoxins. In addition to pathogenic bacteria that can cause food poisoning and zoonotic infectious diseases, bacteria that appear in food include non-pathogenic bacteria that can cause food spoilage and can be used as a sign of food contamination.

Parasites and eggs contaminate food indirectly or directly through water or soil, mainly through the feces of sick and sick animals. Insect contamination mainly includes beetles, mites, and moths in food, as well as flies and maggots in animal food and fermented food. Viral contamination mainly includes hepatitis virus, poliovirus and foot-and-mouth disease virus, and other viruses do not easily multiply on food.

2.Chemical contamination.

Chemical contamination of food involves a wide range of situations and is complex. Mainly include: pollutants from production, life and environment, such as pesticides, veterinary drugs, toxic metals, polycyclic aromatic hydrocarbon compounds, N-nitroso compounds, heterocyclic amines, dioxins, trichloropropanol, etc.; Harmful substances dissolved into food when food containers, packaging materials, means of transportation, etc. come into contact with food; abuse of food additives; Substances produced in the process of food processing and storage, such as harmful alcohols and aldehydes in wine; Substances added in the process of adulteration and counterfeiting.

3.Physical contamination.

Mainly in the complex of a variety of non-chemical debris, although some pollutants may not threaten the health of consumers, but seriously affect the sensory properties and nutritional value of food should be, food quality can not be guaranteed, mainly: pollutants from food production, storage, transportation and marketing, such as grass seeds mixed in the grain harvest, debris in the liquid food container pool, dust and flies in the process of food distribution and marketing; Food adulteration makes fake, such as sand and gravel mixed into grain, water injected into meat, and a large amount of sugar mixed into milk powder; Radioactive contamination of food mainly comes from the mining, smelting, production, application and accident of radioactive substances.

Biological contamination at TUMU is contamination through living organisms.

Chemical pollution is the waste generated by the chemical industry

Biotic pollution refers to the direct or indirect infection or transmission of various diseases by pathogenic microorganisms into the water body. The main indicators are coliform index, total number of bacteria, etc.

Chemical pollution mainly refers to the pollution of agricultural chemicals, food additives, food packaging containers and industrial wastes, and the pollution caused by mercury, cadmium, lead, cyanide, organophosphorus and other organic or inorganic compounds.

Eutrophication of water bodies is a chemical pollution because most of it is caused by phosphorus.

Water eutrophication is a typical chemical pollution. It is caused by the high content of phosphorus and other elements in the water body.

Chemical pollution is caused by direct chemical substances, and biological pollution is caused by metabolites of biological physiological activities.

Chemical pollution, so the current laundry detergent advocates phosphorus-free laundry detergent.

The difference between physical pollution, chemical pollution, and biological pollution is that the properties are different, the residual substances are different, and the pollutants are different.

First, the nature is different.

1. Physical pollution: Physical pollution is the pollution of energy, which is harmless to people.

2. Chemical pollution: Chemical pollution is the pollution of substances, which is harmful to people.

3. Biological pollution: Biological pollution is the pollution of substances, which is harmful to people.

Second, the residual substances are different.

1. Physical pollution: Physical pollution will not have residual substances in the environment.

2. Chemical pollution: chemical pollution will have residual substances in the environment.

3. Biological pollution: Biological pollution will have residual substances in the environment.

Third, pollutants are different.

1. Physical pollution: The pollutants emitted by physical pollution will not increase with time.

2. Chemical pollution: The pollutants emitted by chemical pollution accumulate over time, and the upper limit is not limited, even if the pollution stops being discharged, the pollutants still exist and can be diffused.

3. Biological pollution: The pollutants emitted by biological pollution accumulate over time, and the upper limit is subject to the total amount of organisms, and the pollutants will gradually decrease when the pollution stops.

Physical pollution is pollution caused by physical indicators, including color and turbidity substance pollution, suspended solids pollution, thermal pollution, and radioactive pollution. Chemical type pollution is pollution caused by chemical substances, pollution caused by acid, alkali, organic and inorganic pollutants. Biotic contamination is contamination caused by biological indicators, such as:

Bacteria, viruses and other microorganisms.