Fenton reagent treatment process
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Is the neutralization step with Fenton’s reagent carried out before or after precipitation? The forum mentions that making the solution slightly alkaline helps with precipitation – is that true? I have previously worked on oily wastewater from bearing factories, where neutralization was done after the sedimentation stage; however, an MBR system was used afterward, so the issue of precipitation was not a concern in that case. This time it is a pure Fenton reagent treatment process without any subsequent biochemical steps, so the sedimentation effect must be taken into consideration. Also, how to calculate the sludge production based on COD and SS values?
The precipitation step after the Fenton process is crucial, as it directly affects the efficiency of Fenton-based removal. The pH is usually adjusted to be slightly alkaline; this serves two purposes: ensuring complete reaction and facilitating coagulation； The selection of coagulation agents is also quite critical, as it directly affects the efficiency of coagulation removal. Multiple repeated tests should be conducted in the laboratory, along with several on-site verifications, to ensure that the choice of agents and the dosage used are correct. The sludge production amount is generally the difference between the SS in the inlet water and that in the outlet water, plus the amount generated through reaction and sedimentation. Since ferrous sulfate is used as a catalyst in the Fenton process, the sludge production amount is relatively high.