There are usually three peaks of pollution in a day. It has been reported that the places with the most serious air pollution are actually inside the home. Why?
Think about it, decoration, sipping, all kinds of electrical appliances, cotton fibers, smoking, etc. The sources of pollution are really complete, and there are usually three pollution peaks in one day: First, in the early morning, after a night of sleep, people will Exhale a lot of carbon dioxide, at this time the family air quality is extremely poor;
Second, after returning home from work, because the doors and windows are closed one day, the air cannot circulate;
Third, after dinner, smoke, water vapor, food and other incense, are contaminating the space we live in, so the family must be empty at any time "tune", both the symptoms and the treatment to reduce pollution. For the family's health, many newly renovated indoor users began to use air purifiers to remove formaldehyde, in order to improve the indoor air environment and move to new homes as soon as possible.
As the saying goes, the one-year plan is spring. Many friends will choose to decorate their new home in the spring. However, the renovation will inevitably cause pollution to the indoor air, especially the large amount of formaldehyde emitted, it is really scary. In this context, many home users started using air purifiers to remove indoor formaldehyde. So, using an air purifier in addition to formaldehyde it? Wan Weijia Power Grid did the following experiment to find out the truth during 315 Consumer Rights Day, and let's take a look.
Air Purifier Purifying Formaldehyde Test
Test material: one formaldehyde air purifier, one paint bottle, one acrylic square cover, particle counting air detector
After the electricity is turned on, the air purifier is turned on, and the sprayed paper is placed next to the purifier. Under the effect of the purifier, the air in the acrylic square cover is purified. After the air quality of the acrylic square cover is improved with the help of the air purifier, the PM2.5 concentration in the cover is measured at intervals and recorded. experimental method:
In a 1 cubic cubic acrylic cover, paint-sprayed paper is placed on hold to simulate a high-concentration formaldehyde environment. The original formaldehyde value of the acrylic cover was measured to be 0.02mg/m3. The paper with the paint spray was placed in a hood. The formaldehyde concentration in the hood rose to 0.4mg/m3. An air purifier with formaldehyde removal function was installed. The amount of exhaust air was opened to the maximum, and the value of the formaldehyde concentration was observed every 30 seconds.
Experimental results:
Through experiments we found:
When the air purifier turns on the maximum gear to purify the air, the purifying speed is the fastest and the filtering effect is the best. In a matter of minutes, the formaldehyde contamination value dropped from 0.4 mg/m3 to 0.04 mg/m3, and finally cleared to 0 over time;
In addition to the formaldehyde test, when the indoor concentration of formaldehyde is high, the maximum air screen of the air purifier can be used to quickly purify the indoor air. If the concentration of formaldehyde is 0.40mg/m3 in a 1 cubic meter acrylic square cover, the maximum windshield of the air purifier is turned on (450m3/h). Within 5 minutes, the formaldehyde concentration in the acrylic square cover is significantly reduced to 0.1. Mg/m3. The air cleaner was used to remove the formaldehyde content of the hood. After 10 minutes, the formaldehyde concentration in the hood showed zero. This also indirectly proves that the air purifier has the ability to purify the indoor formaldehyde pollution.
In the air outside the acrylic square cover, the formaldehyde concentration was 0.06 mg/m3.
Note: This experiment only tested the air purifier's filtering effect on formaldehyde. In the daily use of the air purifier, whether the interior doors and windows are closed or not, and whether the door seam leaks will affect the formaldehyde removal effect.
The price of air purifiers varies greatly. There are several hundred dollars, and there are also thousands of dollars or even ten thousand yuan. Most of the sellers have marked that they can remove formaldehyde and remove PM2.5. In the mixed air purifier products, There are air purifiers with the function of formaldehyde in the price of more than a thousand dollars, from the experiment, the air purifier has the ability to purify formaldehyde, purification effect will be affected by the CADR value, indoor size and other factors.
Will formaldehyde leak out?
Under normal circumstances, newly renovated houses will reduce the indoor formaldehyde concentration through window ventilation, but this will not change the release rate and release of pollution sources. In unventilated conditions, such as during the night, some of the materials in newly-renovated houses will also release pollutants. If the concentration exceeds the limits set by the state, it will have an impact on human health. We used an air purifier with formaldehyde addition to carry out the formaldehyde removal test. Through experiments, we observed that the purifier can purify the indoor air and eliminate formaldehyde pollution. However, some netizens may ask, after the air purifier is stopped, will the formaldehyde adsorbed on the filter “run out� Let's take a look.
Air purifiers mainly absorb, decompose or convert various air pollutants. From the previous test, we can see that air purifiers with formaldehyde removal function can adsorb formaldehyde pollution. The activated carbon filter can purify formaldehyde to some extent. Adsorption of activated carbon is more feasible in principle, but in actual use, the filter that absorbs formaldehyde will leak?
There are many kinds of filters, of which the activated carbon filter has a certain ability to adsorb formaldehyde.
Activated carbon filter can adsorb formaldehyde, toluene and other gaseous pollution
As to whether the air purifier will leak the adsorbed formaldehyde and cause secondary pollution to the interior, we conducted two more experiments. The air purifier adsorbed with formaldehyde was closed, the inside of the filter was taken out, all the filters were placed in an acrylic square cover, and after the concentration of formaldehyde was recorded, continuity was observed. Record the formaldehyde concentration in the acrylic square cover every half hour.
Before the experiment, the formaldehyde concentration in the acrylic square cover was 0
Through experiments, we have found that air purifiers have a certain role in the removal of formaldehyde, but they can only serve as an aid to indoor environmental management. After prolonged waits and odds, it was found that the concentration of formaldehyde in the acrylic square cover rose. From this detail, it can be seen that if the adsorption of the activated carbon filter is saturated, there is a danger of formaldehyde leaking. Activated carbon filter adsorption rate is good or bad, determined by the material, it is ineffective to absorb. If it is a thin layer of carbon mesh, it will not be saturated until it absorbs much. The newly-renovated house uses an air purifier to remove formaldehyde. It can test the filter to absorb formaldehyde, but it can't handle formaldehyde. It is recommended to replace it with a filter for a week. In addition, in everyday life, we often open windows for ventilation, which is the easiest, most cost-effective way to remove indoor pollution. However, it may take longer.