I’m in trouble again; I need help
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Today I came across a sample of domestic wastewater; the water quality test results are shown in the figure. The key parameters are as follows: COD=1240, ammonia nitrogen=25.28, and TP=4.51. The client requires that the water meet Class A discharge standards, which mean COD levels of 50, ammonia nitrogen levels of 5, and TP levels of 0.5. I chose the A2O process for treatment, but the client consulted experts who said that this process cannot meet these requirements, especially regarding ammonia nitrogen and total phosphorus, as the removal rates are not high enough. Everyone, do you think this process can meet these requirements? Are there any other better processes?
Judging from the water quality, it shouldn’t be domestic sewage. The ammonia nitrogen level isn’t very high; it’s fine if the biochemical value is below 5. The main issues are COD and total phosphorus; it is recommended to add further advanced treatment processes. Coagulation sedimentation (chemical phosphorus removal) + advanced oxidation (Fenton process or ozone oxidation process for COD removal) can be employed.
Judging from the water quality, it can’t be all domestic sewage; there must be a large amount of industrial wastewater, or perhaps a small amount of highly concentrated industrial wastewater. Do you have the BOD data? What was said upstairs is correct; there’s no issue with ammonia nitrogen ； The removal rate of total phosphorus needs to be around 90%, and the A2O process does not have such a high capacity; chemical phosphorus removal methods need to be used in combination ； For COD, it is also necessary to consider the biodegradability of the wastewater; even if its biodegradability is good, it is difficult to meet the Class A standard. Pretreatment (such as coagulation and sedimentation) and post-treatment (such as MBR) are required to achieve the specified standards.
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