Everyone knows that the new house has just been renovated and cannot be checked in immediately. Because of formaldehyde, long-term effects on the human body will affect people's health. How can we solve the problem of formaldehyde? Expert experiments tell you:
Experimental object: activated carbon bag, air purifier, green radish
Experimental method: The technicians placed activated carbon bags and green radish and opened air purifiers in 3 rooms (living room, kitchen, bedroom) in advance, and the whole process of the experiment was a closed space. Then the largest living room window was ventilated for 5 minutes, and the TVOC volatile gas (that is, the odor such as benzene smelled by us) and the formaldehyde detection data were recorded.
1, activated carbon in addition to formaldehyde
Activated carbon is a relatively inexpensive and practical method, characterized by physical adsorption, which is not easy to cause secondary pollution. Activated carbon is often used for deodorization and detoxification; green plants such as green radish can absorb harmful gases.
Considering that the adsorption requires a process, the technician puts the activated carbon bag and the green radish ahead of the bedroom table cabinet, closes the window and the door, and waits for more than 24 hours. The resulting data is astounding. Before the experiment, the TVOC volatile gas detection value was 4.5mg/m3 (standard value 0.60mg/m3), more than 6 times; formaldehyde was 0.02mg/m3, just up to standard. After closing the window for 24 hours, the TVOC volatile gas detection value soared to 27.5mg/m3, which was 45 times higher than the standard. The instrument was always lit red and issued a warning. The formaldehyde is 0.21 mg/m3, which is more than doubled.
Conclusion: There was no significant change in formaldehyde and volatile gases before and after the experiment. If it is a confined space, so-called biological "artifacts" such as activated carbon and green radish are almost ineffective, and harmful substances are increased by tens of times.
2, air purifier
What is the effect of the air purifier? The technician changed the experimental site to the living room, all the doors and windows were closed, and an air purifier was placed in the middle. This is a domestic brand with a power of 75W. The advertising promotion mentioned that it can adsorb more than 90% of formaldehyde, and the purification efficiency is up to 406 cubic meters per hour.
After about 20 minutes, the air purifier indicator turned from red to green, and the technician took out the instrument to detect it. The results showed that the TVOC volatile gas before the experiment was between 4.8 mg/m3 and 5.1 mg/m3, and the formaldehyde was 0.05 mg/m3. After the experiment, the TVOC volatile gas detection value was 4.75 mg/m3, and the formaldehyde was 0.04 mg/m3, and the decrease was very limited.
Conclusion: The formaldehyde index did not change before and after the experiment. The technicians of the monitoring center explained that the air purifier mainly relies on the filter and the activated carbon to absorb only the particles that are harmful to the human body, such as dust, smoke and PM2.5, which are floating in the air. If it is odor removal to formaldehyde, the effect is not good.
3, window ventilation
The best way to remove toxic gases is to open the window. To verify this, the staff did a set of comparative experiments. Taking the living room as an example, the original door and window closed for 24 hours TVOC about 4.5mg/m3, after the window was ventilated for 5 minutes, the instrument showed that the content dropped to 1.50mg/m3, the effect was obvious. Followed by the bedroom, the door and window sealed for 24 hours formaldehyde content of 0.21mg / m3, after the window was ventilated for 5 minutes, the formaldehyde was reduced to 0.01mg / m3, to meet safety standards.
Conclusion: “A lot of people are rushing to move after installing a new house. This mentality has to change.†The experts from the Municipal Environmental Protection Bureau said that especially when it is hot, the temperature rises quickly, and the volatile substances in wardrobes, beds, wallpapers, etc. accelerate. Relevant experiments have shown that for every 1 increase in room temperature, the concentration of formaldehyde in the air increases accordingly. At room temperature above 30, the amount of formaldehyde released will increase exponentially. Therefore, it is best to spend a summer in a new house, three months to six months.
Source: Kendia Super Floor (only responsible for this sample)
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