Air pollution is a global problem. More and more people are shifting their attention from outdoor pollution to indoor pollution. Every year, more than 4 million people around the world die prematurely from diseases caused by indoor air pollution, according to the World Health Organization. In this issue, we will share a knowledge about indoor air pollution control, let’s walk into the dry goods class with our life knowledge!
Physical formaldehyde removal method
The most useful way to prevent formaldehyde as well as spring control, that is, decoration and furniture purchase from the macho and material, for example, just use wood nailing or metal furniture and decoration, cut the rubber products of carpentry, especially to prevent cheap plywood products, at the same time paint and wood can not prevent the use of low formaldehyde honing pass material.
The first reduction of formaldehyde in the house from the source is the best solution.
Strong ventilation to remove formaldehyde
Strong ventilation is a powerful and useful way to reduce the concentration of formaldehyde, beyond other ways, but only in the outdoor temperature and humidity, air quality and noise can be accepted in the case of the execution, the formaldehyde can be reduced to a safe amount, and once the stop ventilation formaldehyde concentration will be the first to increase, if noise or the use of cold air and other problems caused by the window can not endure, It is a compromise to install a full-heat AC machine with cold air, which is close to the window.
Activated carbon adsorption for formaldehyde removal
Indoor activated carbon pack can absorb formaldehyde, carbon outside the very many small holes can lock the formaldehyde molecules, but there is no other mechanism, so that after adsorption full ineffective need to frequently change the package, even has been adsorbed formaldehyde will be released when the temperature rises. Exposing carbon to the sun can release the locked gas and reuse it, but only a few times. The advantage is that it can be used in drawer or deep room, where there is less UV light and photocatalyst failure.
Ozone unit to remove formaldehyde
Useful concentrations of ozone are also toxic, but ozone can be analyzed in a short period of time, in a certain period of time there is no human existence, animals can be turned off before entering a period of time, you can turn on the ozone generator, reduce the accumulation of formaldehyde.
Indoor pot plants to remove formaldehyde
Formaldehyde reduction by houseplants is a durable research topic. Not all plants have the ability to effectively reduce indoor VOCs (volatile organic compounds). Taiwan environmental protection authorities have announced a special handbook for the public to look up related plants and dispel some folk rumors, but when considering the cultivation ease and overall ability to reduce indoor VOCs, white arum is undoubtedly one of the priorities. According to a 1993 study written by Wolverton, a 46-centimeter white taro tree can degrade 939 micrograms of formaldehyde per hour when exposed to bright light. Assuming 12 hours of daily sunlight, a 46 cm tall white taro can degrade 11,268 micrograms (11 mg) of formaldehyde.
A study published by Hong Kong Baptist University in 2010 found that the efficiency of plants to degrade formaldehyde was not very high, only 0.1 mg per square meter of leaf surface per hour. To achieve the effect described in the 1993 literature, the total area of the leaf surface of the plant must be 10 square meters. This means that previous studies may have overestimated the efficiency of plant degradation of formaldehyde.
If it is suitable for the area of 80 square meters, the height of 3 meters in the bedroom, formaldehyde concentration is 0.5 mg per cubic meter. Indoor air contains 120 milligrams of formaldehyde. To reduce to the safe level (0.1 mg/m3), you need to remove at least 96 mg of formaldehyde. Even without considering the new volatilization of formaldehyde from decorative materials, such as relying on a plant in shape (the total area of the leaf is 0.3 square meters) also want to matter 240 days. Or if it is to be removed in 1 week, 34 trees are needed. Considering that there are constantly new formaldehyde released from household materials, trust plant formaldehyde removal is not a feasible solution.
Fruit and so on to remove formaldehyde
There are many myths about the way formaldehyde is removed. For example, pineapple, onion, tea and so on placed in the indoor environment, claiming to be able to absorb or even analyze formaldehyde. These methods turned out to be nonsense. Even if there is no smell, formaldehyde does not disappear, but is covered by the fragrance. This will put down the guard, ignore the main nature of ventilation, so that the formaldehyde content of indoor air double high.
Misunderstanding of governance
1, oranges, pineapple and other fruits can not absorb formaldehyde
This is a way many people like to use in the past, can be said to be a folk way. Many folk ways are summaries of enduring experiences, truths tested by time and practice. But this approach is a complete fallacy. CCTV Financial channel “Is It True” column once broadcast a program, grapefruit peel, pineapple to remove formaldehyde, is it true? Experiments were specially done in the program, and the experimental effect was explained that in the same sealed bin, the formaldehyde content of the experimental bin with pomelo peel was ten times that of the empty bin. Due to the addition of grapefruit peel, the temperature of the experimental chamber increases, and the amount of formaldehyde is greatly increased. Grapefruit peel, pineapple, etc., not only can not remove formaldehyde, but also increase the indoor formaldehyde content. In the past, many people thought that the use of grapefruit peel, pineapple, indoor decoration taste small, that is because the taste of fruit to hide the taste of formaldehyde. These plants have internal “pipelines” for removing formaldehyde by combining it with certain chemicals to produce amino acids (such as serine). Or carbonic acid and carbon dioxide go directly into the material cycle, where they are used to make new sugars, fats or albumen. So it seems that this process is no doubt to reduce the damage of formaldehyde to plant cells, on the other hand, but also added to the plant “nutrients”. In fact, carbon from formaldehyde and carbon from carbon dioxide are not the rest of the zone. Kind of kills two birds with one stone.
The main reason is that formaldehyde will be linked with superoxide dismutase in plant cells, so that these vital albumin lose activity, and then further damage the cell membrane structure, and finally knock down the wall. This is where the budget for nutrients, water and waste is strictly controlled. So the plant’s luck is predictable.
2, water, vinegar, black tea soak water reciprocating removal of formaldehyde
Many people on the amethyst website said that because formaldehyde is soluble in water, you can put several water POTS at home to absorb formaldehyde, or use vinegar or black tea to soak water and other ways. It is a fact that formaldehyde is soluble in water, water, alcohol and ether. The free formaldehyde in the air will dissolve into the water after the process of movement, which is similar to the adsorption principle of activated carbon. A basin of water and air contact area is only the size of the basin, and 1 gram of activated carbon internal pores than the external area can reach a football field so large. Even if you put one hundred POTS of water in the room, the adsorption effect is not stronger than a small package of activated carbon. Therefore, it is obviously unrealistic to exercise water, black tea, vinegar and other ways to absorb formaldehyde. The release of formaldehyde is related to the temperature and humidity of the room. The increase of temperature in the air will greatly increase the release of formaldehyde. The experimental effect explains that if the relative humidity in the air increases by 10%, the indoor formaldehyde release will increase by about 5%.
3, plant purification air is limited
But we must note that this is nothing more than an outbreak of the plant’s own resistance. The removal of formaldehyde is a necessity for plants. It will be harmless disposal, but also on a lot of detours, far less useful than the light with the absorption of carbon dioxide.
In addition, plants themselves will be in danger during this process. Many plants will be injured, seriously or even killed, in the environment with high concentration of formaldehyde. Sorrel safflower is particularly sensitive, with 95% of its leaves (measured by area) injured when exposed to a formaldehyde concentration of 0.1 mg/m3 for three hours. Moreover, when the formaldehyde concentration increased, the rate of injury was faster. They can only adhere to the formaldehyde concentration of 0.4 mg/cubic meter in the environment for 3 hours, and then, the whole leaf becomes yellow brown and water loss wilting, became withered grass.
