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Anonymous users2024-01-24Lignin is a soluble and refractory macromolecular organic matter, the water is black, the primary pretreatment cannot be removed, and must be treated in the secondary biochemical stage, and the tertiary treatment refers to the advanced treatment. Generally, the wastewater of pulp enterprises in the paper industry also contains lignin, and it is difficult to meet the standard of secondary biochemical treatment.
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Anonymous users2024-01-23It's a bit difficult to remove lignin! The general activated sludge biological system is difficult to remove, and the advanced treatment is enough to choke, some time ago I saw on the Internet that there is a thing called laccase that can effectively degrade lignin, I don't know if there is any practical value, the price is too expensive, I haven't tried to use it!
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Anonymous users2024-01-22Under acidic conditions, lignin will precipitate and can be recovered by air flotation.
How to arrange the furniture appropriately should be judged according to the specific layout of your own home. >>>More
Gates, outer gates, middle doors, small doors, side doors, etc.
There is moisture in the tool, there is water in the paint, the construction environment is relatively humid or the solvent is too much in the drying process, the volatilization is too fast, and the moisture content of the wood is too large, which may cause the furniture to turn white. >>>More
Mites are on animals... The surface of solid wood furniture will be painted and waxed, and formaldehyde will definitely be there, and the amount is not necessarily.
1 There are two ways to do it all, first. More troublesome, first use sand to sagging, first use a little thicker can also be 300, and then use 600 in the play, it is best to grind with water, it is best to wipe dry to see, there is no flat, if you are a professional painter should not be very difficult, in spraying paint, but in this way, after spraying may be a little color difference in the place where it may be hanging, the second method, also use sand to beat off the place of sagging, in the color paint directly cover the flower twist, in the spray paint, this method is easier, However, the owner may not agree. >>>More