Updated: Mar 27, 2020
Under the Coronavirus epidemic, the value of the Unmanned Aerial System (UAS) has been greatly highlighted. Among them, the Unmanned Aerial System had been commonly used to conduct disinfection applications in rural and urban communities across China by virtue of their efficient and safe operating advantages.
Some may be interested in know if drone disinfection is effective, what kind of medicinal solution is suitable for drone epidemic disinfection, and what are the recommended operating parameters based on the usage of our system?
Today, XAG Academy would like to share with our audience some of the common questions relating to how UAS are used in this epidemic disinfection and prevention
How the Coronavirus virus infects patients
The Coronavirus infects patients by touching mucous cells in the lips, mouth, nose, and eyes of humans, so the key protection is to prevent the virus from entering our eyes, mouths, and noses
The virus is currently known to be transmitted in two ways:
i) Transmitted through respiratory droplets.
After leaving the human body, the droplets will settle quickly and will not float in the air all the time, so the transmission distance is very limited, generally 1-2 meters;
ii) Contact with viral pollutants.
For example, the virus in the droplets adheres to the surface of objects, such as door handles, elevator buttons, desktop keyboards, etc. After people touch these objects with their hands if they touch their eyes, mouths, and noses, it Will cause infection. According to the expert group of the China National Health Commission, the virus is capable of surviving for several hours on a smooth surface; and if the temperature and humidity are appropriate, it may survive for up to several days (such as temperature 20 ° C and humidity 40% -50%. At present, studies have found viruses It is possible to survive up to 5 days.)
Therefore, it is important to disinfect items that may be contaminated by the virus in a timely manner
2. Common disinfection solution
2.1. Medical Alcohol
The main component of medical alcohol is ethanol, which is mainly made by fermenting starch plants and can be used for human disinfection.
Ethanol can absorb the water of the new coronavirus protein and dehydrate it.
Disinfection alcohol concentration is generally about 70% -75%.
If it is 90% alcohol, it needs to be diluted according to the ratio of alcohol: water (5: 1);
if it is 95% alcohol, it needs to be diluted with the ratio of alcohol: water (4: 1).
Alcohol is flammable. In the event of sparks or high temperature during spraying, it is easy to catch fire and cause a fire. During transportation, pay attention to prevent alcohol dumping and leakage, and equip fire extinguishers to prevent fire.
Industrial alcohol contains methanol, which can cause human poisoning and is not a substitute for medical alcohol disinfection.
It is not recommended to use 84 disinfectant and alcohol at the same time, the disinfection effect may be weakened, and even toxic substances may be produced
2.2. Chlorine disinfectant
Common chlorine-containing disinfectants refer to disinfectants that produce sodium hypochlorite (NaClO) when dissolved in water. There are 84 disinfectant solutions, chlorine-containing disinfection powders, and chlorine-containing effervescent tablets. 84 Disinfectant is a mixed disinfectant of sodium hypochlorite and surfactant. It is a colorless or light-yellow liquid with an effective chlorine content of 4-7% and an irritating odor.
NaClO produces hypochlorite and new ecological oxygen in water, which has strong oxidizing properties, which denatures the viral protein shell, leading to the denaturation and death of viral proteins.
84 Disinfectant is corrosive and irritating to the skin and oral mucosa. Operators should wear latex gloves, protective clothing, goggles, and the disinfectant solution should be more than 30 cm from the face. Do not stir the disinfectant vigorously to avoid splashing.
84 The residue of disinfectant may be harmful to the human body. It is necessary to prevent the liquid from drifting to personnel, food, and clothing. Items that have been sterilized and come in direct contact with the human body need to be repeatedly washed with water.
84 Disinfectant has poor stability. It will decompose in the environment of sunlight, high temperature, acid, etc. Try to avoid spraying when the sun is violent.
Residents should be notified through the neighborhood committees to close the doors and windows, avoid disputes that may be caused by chemical application on the human body and food
2.3. Peroxide disinfectant
Peroxide disinfectants include hydrogen peroxide, peroxyacetic acid, and chlorine peroxide. The peroxide-based disinfectant destroys the molecular structure of proteins in the virus through its strong oxidizing property, causing it to die.
2.3.1. Hydrogen Peroxide
Colorless transparent liquid with strong oxidation, strong irritation, corrosive, bleaching.
The effect of killing the virus is good, it is relatively green, safe, and has no residue. Hydrogen peroxide is relatively stable at lower temperatures and concentrations, but it will be decomposed when exposed to high temperatures, light, metal ions, and other impurities. It is recommended to spray in the environment with no strong sunlight such as morning, evening and cloudy days.
2.3.2. Peroxyacetic acid
Strong oxidizing, corrosive, strong irritating odor, good virus killing effect, no green residue. However, it has a strong stimulating effect on the human respiratory tract, skin, and mucous membranes, causing adverse symptoms. The concentration should not be too high. Peroxyacetic acid is easy to decompose when it is exposed to light. It is recommended to spray in the morning, evening and cloudy.
2.3.3. Chlorine dioxide:
Strongly oxidizing, it is a safe, non-toxic, highly effective and durable disinfectant with no toxic residue. It is widely used in drinking water, food, and hospital disinfection, but it is volatile and needs to be used immediately.
In addition, in the spring and winter seasons, the natural sunlight is irradiated, the temperature and the intensity of ultraviolet rays are not sufficient to eradicate the virus