Comprehensive treatment (incineration) of three types of waste from newly built factories.
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We’re building a new factory. Presumably, the solid wastes include the following: salt produced from triple-effect evaporation, (NaCl) ； 50T/D ； It has a yellowish tint and can barely be used in the printing and dyeing industry; sometimes it is too yellow, so it needs to be redissolved and evaporated. Slag/waste PP filter bags/resin residue at 1T/D are all organic residues and should be burnable. Waste liquid: triple-effect evaporation mother liquor ； 2T per day ； It’s mainly glycerol and salt, with about 20% water. I also plan to get a device for extracting crude glycerol. But it’s not clear whether the consumption level is appropriate. If the consumption ratio isn’t appropriate, I just want to burn it directly. Waste solvents 1) Toluene/methanol mixture ； 4T/D with trace resin ； For this part, I’d like to implement recovery via distillation. But these two solvents are too cheap; burning them to generate some heat is more cost-effective than distillation. Our calculations show that burning them is indeed the better option. 2) Mixed liquid under cryogenic tail gas recovery ； 0.2T/D mainly consists of organic solvents; it contains no chlorine but does contain phenols. 3) Tail gas recovery condensate 2 contains 0.05 T/D of chlorine, with VOC levels of 60–300 mg/m3; the air flow rate is approximately 12,000 m3/h. This issue can be addressed by increasing the use of activated carbon for adsorption. I am also considering whether it would be possible to send this waste directly to the incinerator. Currently, preliminary planning and environmental impact assessment procedures are underway. The problem now is our factory’s plan for treating industrial waste. Recently, I have also been looking into scale-type incinerators and rotary kilns for waste salts; as for waste liquids, I am considering a small incineration system. I wonder if everyone has a mature solution to this problem. To provide some references. Thanks a lot.
It seems to be a world-wide problem, with no responses at all. Are there any good examples of cases where waste salt management has been successfully carried out?
It’s best to produce ion-exchange membrane caustic soda by oneself. The by-products of hazardous waste still fall under the category of hazardous waste; they can’t simply be sold on the market.
The EIA essentially deals with by-product salt. It also works very well downstream; currently, I just want to reduce the organic matter in the salt. What you said about handling the ion membrane by yourself is an exaggeration. And ion membranes aren’t that easy to produce in bulk, right?
For chloride-free waste liquids, it is recommended to incinerate them entirely; salt can cause severe corrosion to the lining of rotary kilns, so this type of furnace is not advisable. For chloride-containing waste liquids, it is advisable to have them disposed of by external contractors. Waste gases can be directed into an incinerator, provided that proper safety measures are taken. Using activated carbon generates a large amount of waste activated carbon; it is also possible to use zeolite concentration combined with CO combustion