The quality of air directly affects people’s physical health, mental health and comfort. The following is a technical paper on air pollution control that I carefully recommend for everyone. I hope it will be helpful to you. Air Pollution Control Technology Paper Part One
New Technologies for Indoor Air Pollution Control
Abstract: Indoor environment is the most important environment in people’s lives and work. As people’s living standards improve, indoor Decoration is becoming increasingly sophisticated, and the sources and types of indoor air pollutants are increasing day by day. The quality of indoor air directly affects people's physical health, mental health and comfort. In order to improve air quality and enhance physical and mental health, it is necessary to control air pollution. Therefore, it is urgent to research new technologies for pollution control.
Keywords: Indoor environmental pollution control technology
1. Membrane separation and purification technology
Membrane separation technology is a simple, fast, efficient, economical and energy-saving New technology. Membranes used for gas separation mainly include organic polymeric membranes and inorganic membranes. Simple aromatic compounds can be separated using this technology, and the effect is very obvious. The basic method is to cover the surface of the porous packing in the filter with a biofilm. When the exhaust gas flows through the packing bed, the pollutant components are transferred to the biofilm through the diffusion process, and come into contact with the microorganisms in the membrane to cause a biochemical reaction. The pollutants in the exhaust gas are completely degraded into CO2 and H2O.
2. Chemical pollution prevention and control technology
Based on the crystallized sharp mineral nano-TiO2 active material, it combines photosensitization, metal ion and non-metal ion doping, metal Oxide composites, precious metal loading, surface modification and many other methods are prepared using nanosol synthesis technology, which breaks through the two major technical problems that limited the application of catalytic materials in the past: narrow excitation band and easy agglomeration of nanoparticles [1].
This technology is atomized and activated through high-density film-forming technology to form a non-toxic nano-catalytic layer with strong adhesion on the surfaces of walls, furniture, floors, etc., which can decompose harmful gases, release oxygen negative ions, Long action time, super hydrophilic and anti-fouling, no secondary pollution
3. Probiotics plus bio-enzyme technology
Probiotics plus bio-enzyme technology uses unique probiotic bio-enzymes ? Comprehensive prevention and control technology. Through advanced biotechnological means, highly prey-loving biological bacteria are induced and domesticated to become probiotic bacteria that can support metabolism, metabolism or auxiliary metabolism. The organic combination of probiotics and biological enzymes has a mechanism to destroy harmful substances such as formaldehyde, ammonia, benzene and TVOC, and uses its unique catalytic function to destroy the molecular chains of organic substances extremely quickly, making formaldehyde and other harmful substances Elements such as C, N, and S in the substance are split from their molecular chains, thereby purifying the air.
4. New technology for user verification
This article mainly takes probiotic plus biological enzyme technology as an example to test the formaldehyde, benzene, ammonia, and total volatile organic compounds (TVOC) in the user's room. Tests were conducted to verify the practicality of probiotic plus bioenzyme technology.
1. Determination of detection time, number of points and locations
1.1 Testing time: According to the requirements of GB50325-2010, when testing formaldehyde, ammonia, benzene and TVOC, Close all doors and windows 1 hour before.
1.2 Number of points: The number of indoor sampling points is set according to the area of ??the room. For rooms smaller than 50m2, 1 point should be set; for 50m2 to 100m2, 2 points should be set; for 100m2 to 500m2, no less than 3 points should be set points; 500 m2 ~ 1000 m2 shall be provided with no less than 5 points; 1000 m2 ~ 3000 m2 shall be provided with no less than 6 points.
1.3 Point location: Detection points should be evenly distributed and avoid ventilation ducts and vents. Diagonal lines, diagonal lines, and plum blossom shapes should be used to distribute points evenly, and the average value of the test results should be used as the test value.
2. Sample detection
2.1 Benzene detection
Sampling method: Open the activated carbon tube at the sampling location, connect it vertically to the air inlet of the air sampler, and connect it to 0.5 L/min speed, collect 10L air, record sampling time, flow rate, temperature and air pressure. Samples can be stored for 5 days.
Sample analysis: Make a standard curve, and then place the sample adsorption tube in the thermal desorption direct sampling device. After desorption at 300°C ~ 350°C, the desorbed gas enters the gas chromatograph for chromatographic analysis. Retention time is used for qualitative analysis and peak height is used for quantitative analysis. At the same time, the blank sample must be analyzed by gas chromatography [2].
2.2 Detection of formaldehyde
Sampling steps: Use a large bubble absorption tube containing 5mL of phenol reagent absorption liquid to collect 10L of gas at a flow rate of 0.5L/min, and record the gas at the sampling point. Temperature, air pressure. Samples can be stored for 24 hours.
Sample analysis: First make a standard curve, then transfer the sample solution into a stoppered colorimetric tube, wash the absorption tube with a small amount of water, combine to make the total volume 10mL, and then measure the absorbance of the sample, according to Calculate the sample concentration from the standard curve. At the same time, a blank sample must also be measured.
2.3 Sampling and detection of ammonia
Sampling steps: Use a large bubble absorption tube containing 10mL of dilute sulfuric acid absorption liquid to collect 5L of gas at a flow rate of 0.5L/min, and record the sampling point temperature and air pressure. Samples can be stored for 24 hours.
Sample analysis: First make a standard curve, then transfer the sample solution into a stoppered colorimetric tube, wash the absorption tube with a small amount of water, combine to make the total volume 10mL, and then measure the absorbance of the sample. At the same time, a blank sample must also be measured.
Sample analysis: Place the adsorption tube in the thermal desorption direct sampling device and desorb at 280℃~300℃; at the same time, blow the desorbed sample into a 100mL syringe with high-purity nitrogen, and then Use a small syringe to extract 1 mL of the gas sample and put it into the gasification chamber of the gas chromatograph. The sample is split at a ratio of 10:1 and then enters the small-diameter capillary column. The column oven is heated at a temperature of 50°C to 250°C to separate different compounds. Component [3].
3. Analysis of test results
Before the test, the household’s pollution situation was analyzed. There were basically no outstanding pollution sources. The final pollution result was the superposition of pollution from multiple indoor pollution sources. . Probiotics plus biological enzyme technology is used to detect indoor environmental pollution of residents, and the real effect of this technology can be tested. The test results are as follows:
Table 1 Testing effect unit before and after treatment: mg/m3
Testing items before and after treatment Testing standards Class I civil building standards
Formaldehyde 0.52 0.021 GB50325-2010 ?0.08
Ammonia 0.8 0.01 ?0.20
Benzene 0.05 0.00 ?0.09
TVOC 1.62 0.348 ?0.50
From the above table, it can be seen that the three pollutants of formaldehyde, ammonia, and TVOC exceeded the standard before treatment. After using probiotics plus biological enzyme technology to treat formaldehyde, ammonia, and TVOC, they have fully met the standard requirements. It can be seen that the effect of this treatment technology is very obvious.
5. Conclusion
In short, the components of indoor air pollution are complex, and it is difficult for a single air purification technology to purify them all. The current development trend of air purification technology is to use photocatalysts to catalyze oxidation and reduction, A combination of technologies such as low-temperature plasma, biological purification, negative ion technology and green plant purification technology work together to minimize indoor pollution and minimize the harm to human health caused by indoor pollution.
References:
[1] Huang Wei, Lu Yin. Investigation of indoor air pollution [J]. Gansu Environmental Research and Monitoring, 2007, 16(1): 87- 90.
[2] Cao Peisen, Wang Yubao, Qiao Anqing. Research progress on modification and application of nano-TiO2 [J]. Nanomaterials and Structures, 2008, 3(24): 143-150.
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