Treatment of chemical wastewater
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Our company specializes in the production of pharmaceutical intermediates. A large amount of organic solvents are used in the production process, and significant amounts of wastewater are generated as a result. After preliminary treatment in the workshop, followed by physical-chemical and biological treatment, the COD level of the wastewater is between 300-400 mg/L. However, our emission requirements specify a lower COD level
Is it true that as long as the COD level meets the standards, things become simpler – just add some strong oxidizing agents, such as Fenton’s reagent.
If you have the capability to install a biochemical treatment system, I’m not sure what your BOD level is or what the biodegradability of the waste is like
We already have biochemical treatment, but its biodegradability is very poor!
Has the reason for the poor biochemistry been found? It could be due to unstable water quality, residence time, aeration, and so on; or it may be related to whether the design of the process is appropriate – all of these factors are crucial
Reply to 1# py2008: Please provide a detailed description of your company’s current wastewater quality, volume, and existing wastewater treatment processes; otherwise, it will be impossible to proceed.
Our daily wastewater volume is 200–300 cubic meters per day, with a COD level of around 5000 mg/L. Initially, physicochemical treatment is used, followed by biological treatment; after that, the COD level drops to about 300 mg/L. Our discharge requirements regarding COD are as follows:
This post was last edited by zfc318 on 2010-10-21 17:23. Is biochemical treatment aerobic, anaerobic, or a combination of both? Could you describe it in a bit more detail? I think the biochemical stage is very important; if the process is good, it’s not a big issue to reduce it to around 100
Our biochemical system uses the A2O process, and the treatment efficiency can reach around 70–80%!
Reply to 1# py2008: I have also encountered such wastewater. I’ll suggest an idea; you think about it on your own. Currently, there is a catalyst that, when used in combination with hydrogen peroxide for catalytic oxidation, can treat such wastewater to levels below 100. A further pilot experiment is needed. If you’re interested, contact me and I’ll ask in more detail about the usage at that chemical plant. Reference.
Reply to 10# ipgood: It’s very important to know what this catalyst is, and what its cost is as well Some forums claim that the catalytic oxidation method for treating papermaking wastewater has very low costs, but usually that is not the case.