Method for treating wastewater by combining catalytic oxidation with biological aerated filter
A biological aerated filter and catalytic oxidation technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of industrial application limitations, large acid and alkali consumption, etc., and achieve reduction Acid and alkali consumption, reduction of treatment cost, effect of cost reduction
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[0029] Example 1
[0030] To treat non-compliant wastewater discharged from a refinery, use H 2 O 2 As oxidant, Fe 2 SO 4 As a catalyst, the acid and alkali used are concentrated H 2 SO 4 And NaOH. Operating conditions are: H 2 O 2 The ratio of mass concentration to the organic matter (COD) in wastewater is 1:3, H 2 O 2 / Fe 2+ The molar ratio of the oxidation tank is 1:2, the pH of the oxidation tank is 3, the pH of the supernatant of the sedimentation tank is 7, the pH of the dissolution tank is 0.3, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 60 minutes, and the sedimentation tank stays The time is 2 hours, and the residence time of the biological aerated filter is 4 hours. The treatment results are shown in Table 1. From the data in Table 1, it can be seen that after the wastewater is treated by catalytic oxidation, the COD and oil content is greatly reduced, and the biodegradability is significantly improve...
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[0033] Example 2
[0034] The pretreatment of reverse osmosis influent in the process of wastewater reuse in a refinery uses H 2 O 2 As oxidant, Fe 2 SO 4 As a catalyst, the acid and alkali used are concentrated H 2 SO 4 And NaOH. The operating conditions are determined as: H 2 O 2 The ratio of mass concentration to the organic matter (COD) in the wastewater is 1:2, H 2 O 2 / Fe 2+ The molar ratio is 1:1, the pH of the oxidation tank is 5, the pH of the supernatant of the sedimentation tank is 6.5, the pH of the dissolution tank is 0.5, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 40 minutes, and the residence time of the sedimentation tank is 1.5 hours, the residence time of the biological aerated filter is 3 hours. From the data in Table 1, it can be seen that after the wastewater is treated by catalytic oxidation, the COD is greatly reduced, and the biodegradability is significantly improved. After the BAF trea...
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[0037] Example 3
[0038] To treat non-compliant effluent from a chemical plant, sodium hypochlorite is used as the oxidant, Fe 2 SO 4 As a catalyst, the acid and alkali used are concentrated H 2 SO 4 And NaOH. The operating conditions are: the mass concentration ratio of sodium hypochlorite to the organic matter (COD) in wastewater is 1:3, sodium hypochlorite / Fe 2+ The molar ratio of the oxidation tank is 1:1.5, the pH of the oxidation tank is 4, the pH of the supernatant of the sedimentation tank is 7.5, the pH of the dissolution tank is 0.3, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 60 minutes, and the sedimentation tank stays The time is 2 hours, and the residence time of the biological aerated filter is 4 hours. The treatment results are shown in Table 3. From the data in Table 3, it can be seen that after the wastewater is treated by catalytic oxidation, the COD and oil content are greatly reduced, and ...
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