Selection of a treatment scheme for fine chemical wastewater

The biodegradability is only 0.1, which means that if biochemical methods are used, poor treatment results or the need to cultivate specific bacterial strains will arise. Furthermore, the organic components in wastewater are currently not conducive to anaerobic digestion. To use biochemical methods, it is necessary to find a carbon source, such as mixing in domestic wastewater, to improve biodegradability. The activated carbon rule is intended to ensure regeneration issues are addressed. This post was last edited by yigect on 2008-2-27 15:59.]

What was said upstairs makes a lot of sense; indeed, similar types of wastewater present considerable challenges in terms of treatment. Here are some of my personal views: 1. In my work, I have been involved in adjusting processes for waters of similar quality, and it was found that the effectiveness of anaerobic treatment is limited (a lack of readily decomposable carbon sources and the biochemical inhibitory effect of similar substances affect the removal efficiency). It is recommended to use membrane biological processes such as AF hydrolysis combined with contact oxidation to meet the requirements for water quality before it is discharged. Fillers play a very important role in this entire biochemical process, as they help ensure the stability of the biochemical system. If the water is to be discharged in compliance with standards, then physical and chemical treatment steps as well as activated carbon adsorption at the later stages are also necessary. 2. For physical treatment, thermal separation or advanced oxidation can be attempted; if thermal separation is used, fewer subsequent treatments are needed, although the heating cost associated with thermal separation is higher. 3. In the case of activated carbon adsorption, the adsorption capacity is only around 10%, the operating costs are quite high, and its effectiveness declines after a few cycles of regeneration; therefore, activated carbon can only serve as an auxiliary measure for filtration.

Thank you to the person above; I’ve learned something new: handshake

I would like to add that if adsorption is used, it may have little effect on propanol. I believe considering oxidation before biochemical treatment is a viable option. Alternatively, extraction could be considered first, followed by regeneration, which avoids the need to cultivate special strains.

Thank you. . . I seek advice from all the experts here. It seems the problem is much more difficult than I thought. If there are any further actions to take, please give me some advice. Thank you. . .

Excuse me, what does AF hydrolysis mean? What are the water quality requirements for pipe systems? Is there any difference between this requirement and the emission standards? Does thermal separation refer to heating and evaporation? Could someone please explain this? Thank you. . .

It’s still necessary to analyze the data more thoroughly before coming up with strategies

Many sources state that materials of this type are biodegradable; then why is it said that they are difficult to handle on the 2nd and 3rd floors?

In fact, biological treatment requires some pretreatment to improve biodegradability; for example, microelectrolysis can be used as a pretreatment method, followed by anaerobic + aerobic treatment, which is a viable approach and also the most economical and environmentally friendly one. Using activated carbon for adsorption is an option, but due to the high COD level, a large amount of activated carbon is required to meet the requirements. Moreover, an activated carbon regeneration system is needed, which incurs high initial costs and operating expenses; as a result, some systems cannot be operated in this way. It would be ideal to use distillation for recovery, as this would allow the majority of useful organic substances to be recovered and reused, while the remaining material could be treated through biochemical methods, which is much less difficult.

If the B/C ratio is low and biochemical treatment is used, it will be difficult to meet the required standards. Solution 1: Add nutrients to increase the B/C ratio. Solution 2: Use physical-chemical methods in combination with biochemical treatment. The water you have currently consists mainly of similar types of substances, and its oxidizability is not very good. It is recommended to use Fenton’s process + coagulation + hydrolysis + SBR, or QBR + hydrolysis + SBR. This post was last edited by Fightinghard on 2009-4-22 at 12:53