How is wastewater from the coal chemical industry treated at present? Can someone provide some information?
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As the title suggests, in the fields of coal chemical industry and sewage treatment, environmental assessment seems to be a key focus. Which companies are considered top performers in this area?
In the wastewater, levels of COD, BOD, ammonia nitrogen, hardness, turbidity, and cyanides are all quite high; discharging it directly into rivers would cause pollution. Our factory ensures that the wastewater is treated to meet regulatory standards before being discharged, as this is the best way to prevent environmental contamination.
Wastewater must undergo treatment (biological treatment), and only when the parameters meet the discharge standards can it be released.
It definitely needs to be dealt with; otherwise, it won’t be possible to pass the **assessment. I would like to ask, what are the current methods used for handling this?
The wastewater treatment in Jinling, Dezhou, and Shanghai is of good quality, with biochemical treatment being used
The essence of the question is: What process? Processing index compliance rate? Operating cost? The extraction efficiency of monophenols and polyphenols, the reliability of the new MIBK process – check it yourself, ask around. It’s about current matters; I don’t want to get scolded. Think about it, right?
We use biochemical treatment methods!
Chemical plants all use boilers; generally, these are coal boilers which are inefficient and environmentally unfriendly, while slurry boilers are more efficient and environmentally friendly. Build a water-coal slurry plant locally to produce water-coal slurry using chemical wastewater, which is then used to fuel boilers. It’s all solved now! !
This post was last edited by cehjgai on 2009-11-9 at 16:40. The treatment of gas and water, especially those generated when using low-quality coal in Lurgi gasification processes, presents a challenge. 1 When the phenol content is above 1000 mg/L, it is recommended to use extraction devices; the choice of extraction process should be determined based on the specific conditions of each plant. 2 I believe that reducing the total phenol content to below 500 mg/L is a relatively economical and reasonable goal. After all, when the phenol level drops to 500 or even 600 mg/L or less, phenol no longer poses a problem for the biochemical treatment stage. 3 As for the COD level, there is a misconception that the lower it is, the better. However, for gas and water, an excessively low COD level is not advantageous. I think it is sufficient to reduce COD to below 3500. Further reduction is likely achieved by removing easily biodegradable substances such as short-chain fatty acids; while this can lower COD, it also leads to a decrease in the biodegradability index (BOD/COD). In other words, as COD levels continue to drop, the proportion of hard-to-biodegrade substances in the wastewater increases. If all the easily biodegradable substances are removed, what will provide the nutrients needed for the biochemical treatment process? It will inevitably require the addition of more nutrients later on. Thus, an excessive focus on reducing phenol content inevitably results in a decrease in the biodegradability of the wastewater, which is an undesirable outcome. 4 Regarding extraction processes, options such as ether systems, MIBK systems, mineral oils, and other solvent oil systems are available – which one is the most suitable? I think the choice should be based on factors such as the quality of the wastewater, the volume and composition of wastewater from other processes, and the intended use of the recovered phenol products. Each of these systems has its advantages and disadvantages, so a comprehensive consideration is necessary. The cost of phenol and ammonia recovery per ton of wastewater varies by more than 10 yuan among different phenol recovery processes. Therefore, process selection is very important. It’s not that this water cannot be treated; the challenge lies in treating it in an economical and efficient manner. At present, we already possess a variety of relevant processing techniques and engineering experience, and there is an opportunity for everyone to exchange more ideas. 189-0532-6800, 139-0532-4699