Q&A: Those who encounter problems in chemical wastewater treatment can ask questions
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Discussions can be held on equipment processes, limited to the treatment of chemical wastewater. This post was last edited by hesonchang214 on 2009-4-23 at 13:14.]
Upstairs, what is the salt content of the water there? I’m not aware of your water volume. This post was last edited by li*ch1968 on 2009-4-23 20:14]
Theoretical calculation time for hydrolysis: 8 H; it is recommended to set this value at 10 H. Calculation time for the aerobic retention time: 24.9 H
Main components in wastewater: DMF, styrene, acrylonitrile. Problem: High ammonia nitrogen levels in the effluent; what should be done?
At the end of the process, the breakpoint chlorination method is used, and chlorine-based oxidants are added to the effluent based on the actual ammonia nitrogen levels in it. This post was last edited by pmsl1982820 on 2009-4-24 08:42.]
Coagulation and flocculation are carried out in the effluent to form aluminum phosphate precipitates; this ensures proper functioning of the subsequent process stages. For the earlier stages, it is necessary to analyze whether the phosphorus in the water is organic or inorganic, and adjust the process accordingly based on the type of phosphorus present.
This post was last edited by shanyee on 2009-5-9 at 19:54. With the adoption of the breakpoint chlorination process, does it increase the likelihood of dioxin formation during the subsequent sludge incineration process? Point chlorination: The process of using chlorine to oxidize ammonia nitrogen in a solution into nitrogen gas and other stable compounds is known as point chlorination. Perhaps the main advantage of this process is that it allows all of the ammonia nitrogen in wastewater to be oxidized through proper control. However, this process also has several disadvantages, including the generation of acids (HCl) that react with alkalinity, the formation of total dissolved solids, and the creation of certain harmful chlorinated organic compounds. This process is facing elimination and is not in line with the principles of clean production.
May I ask the original poster: How is the wastewater generated from petrochemical catalytic cracking treated? How about treating it with the activated sludge method? Can the water quality parameters of that treatment process meet first-class standards? Thank you!
Reuse of reclaimed water generally involves ultrafiltration + reverse osmosis treatment
As domestic refineries continue to process larger amounts of high-sulfur oil, the levels of sulfur and nitrogen in the wastewater discharged increase significantly. This is evident in (1) the deterioration of water acidity; even after desulfurization and denitrification using stripping towers, the ammonia nitrogen level remains high, and treatment using sludge methods fails to meet the requirements for wastewater discharge； (2) Sulfur-containing waste alkali solution; it must be pre-treated before being discharged into the wastewater treatment plant.
The sixteenth stream of wastewater amounts to 2,000 tons per day; it contains about 10% sodium sulfate and sulfuric acid, with ammonia nitrogen levels ranging from 4,000 to 20,000 mg/L.