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7 Q&A questions to help you correctly understand and scientifically use activated carbon
Activated carbon has a developed pore structure, a large specific surface area, and abundant surface chemical groups, with strong specific adsorption ability. It is a commonly used solid adsorbent material, applied in chemical, pharmaceutical, environmental and other fields, for adsorbing substances with high boiling points and critical temperatures, as well as organic compounds with large molecular weights. Since the launch of the campaign to prevent and control air pollution, activated carbon has become a frequently used buzzword in ecological and environmental work, with the management of volatile organic compounds being put on the agenda.
To help everyone have a correct understanding and scientific use of activated carbon, we have compiled 7 Q&A questions for your reference.
How much activated carbon should be filled into the adsorption tower of a car repair shop?
The air volume of the adsorption tower in the auto repair shop is generally above 10000m ³/h, and 1.5m ³ or 750kg activated carbon should be installed.
How long should activated carbon be replaced or regenerated after use?
Fill according to the above quantity, and the activated carbon in the auto repair shop needs to be replaced or regenerated after 60 days of normal use.
What is the appropriate temperature for activated carbon adsorption?
The adsorption temperature of activated carbon should not exceed 40 ℃.
How much investment is needed for the activated carbon adsorption tower in a car repair shop?
The activated carbon adsorption tower in the auto repair shop requires an investment of about 100000 yuan (including pre-treatment box, activated carbon box, fan and chimney, and electrical control cabinet) for a capacity of 10000m ³/h
How to temporarily store and dispose of waste activated carbon?
Activated carbon itself is not hazardous, so discarded pure activated carbon does not belong to hazardous waste. However, according to the definition of HW12 and HW49 categories of hazardous waste in the National Hazardous Waste List, the waste activated carbon (hereinafter referred to as "VOCs waste activated carbon") adsorbed by VOCs in the painting and chemical industries is classified as hazardous waste and must be entrusted to units with hazardous waste management qualifications for collection, storage, utilization, and disposal. The temporary storage of waste activated carbon should be sealed and kept below 40 ° C.
How to distinguish the advantages and disadvantages of activated carbon?
1. Judging by the feel:
The higher the adsorption capacity of activated carbon, the larger the pores. The more activated carbon there is, the lighter the relative density. Therefore, the better the activated carbon, the lighter the hand feel.
2. Check the particle size:
The smaller the particle size of activated carbon, the larger the contact area with air, the larger the specific surface area, and the better the adsorption effect.
3. Look at the bubbles
Activated carbon has a porous structure, and high-quality activated carbon will produce a large number of small bubbles when poured into water. When a small handful of activated carbon is poured into water, due to the permeation effect of water, the water will gradually penetrate into the pore structure of activated carbon, forcing the air in the pores to be discharged, thereby producing a series of extremely small bubbles that pull out a small bubble line in the water. The more severe and long-lasting this phenomenon occurs, the better the adsorption capacity of activated carbon.
4. Check the water quality
Activated carbon has the unique ability to turn colored liquids into light or colorless. When placing activated carbon in colored water, the amount should reach half or more of the water. After standing for 10-20 minutes, it should be compared with a reference water sample. Under equal conditions, the stronger the decolorization effect, the better the adsorption of activated carbon.
5. Look at the dust:
The primary principle of using activated carbon is not to dirty objects. To produce activated carbon, post-treatment is necessary, which means removing dust from crushed coconut shells and other materials. If the ash content of activated carbon is not treated, it will be very dirty when touched by hand.
6. Check iodine value:
There are two types of activated carbon used in exhaust gas treatment equipment: columnar activated carbon and honeycomb activated carbon. For activated carbon adsorption using granular, columnar, etc., activated carbon with an iodine value of not less than 800 milligrams per gram should be selected; For the use of honeycomb shaped activated carbon adsorption, activated carbon with an iodine value not less than 550 mg/g (carbon tetrachloride index ≥ 55%) should be selected.
