Fenton and air-float integral water treating method
A water treatment and air flotation technology, which is applied in flotation water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., to achieve the effects of saving air source, good effluent quality and high efficiency
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[0028] Example 1
[0029] Adopting Fenton and air flotation integrated water treatment method for advanced treatment of the biochemical effluent of landfill leachate from a landfill plant in Guangdong. Treated water volume: 10t / h, and the COD value of influent water is 300mg / L. First, it is treated with Fenton reagent, and the hydrogen peroxide and ferrous sulfate heptahydrate solution are added to the wastewater with a metering pump. The dosage of the agent is as follows: Fe 2+ With H 2 O 2 The molar ratio is 0.5:1, and the mass ratio of hydrogen peroxide to COD in the water to be treated is 0.8:1, which is H 2 O 2 Dosing amount 240mg / L, FeSO 4 ·7H 2 O dosage is 900mg / L. The Fenton oxidation reaction time is 2.5 hours, and then the water treated with Fenton reagent is added with sodium hydroxide to adjust the pH to 6-7, and the sodium hydroxide added is 50kg per day. Enter the 1.5m high air flotation tank, add sodium polyacrylate according to 5mg / L, add 1.2kg sodium polyac
Example Embodiment
[0030] Example 2
[0031] The wastewater of a chemical plant has a water volume of 3t / h. The average COD content of the effluent after the secondary biochemical treatment is 120mg / L, which is slightly higher than the wastewater discharge standard. This wastewater has undergone biochemical treatment, and most of the organic matter in the water is difficult to further biochemically treat. The Fenton and air flotation integrated water treatment method of the present invention is used to treat the situation as follows: First, through the pretreatment of Fenton reagent, the hydrogen peroxide and heptahydrate are combined with a metering pump. Ferrous sulfate solution is added to wastewater, where Fe 2+ With H 2 O 2 The molar ratio of H2O is 0.05:1, and the mass ratio of hydrogen peroxide to COD in the water to be treated is 0.3:1, that is, based on the volume of pretreated water, H 2 O 2 Dosing amount 36mg / L, FeSO 4 ·7H 2 The dosage of O is 30mg / L. The chemical oxidation reaction
Example Embodiment
[0032] Example 3
[0033] Fenton and air flotation integrated water treatment method was used to treat wastewater from a terminal in Zhuhai. The COD of the wastewater is 1200mg / L, and the treated water volume is 10t / d. First, it is treated by Fenton reagent, and the hydrogen peroxide and heptahydrate ferrous sulfate solution are added to the wastewater with a metering pump. 2+ With H 2 O 2 The molar ratio of H2O is 2:1, and the mass ratio of hydrogen peroxide to COD in the water to be treated is 3:1, that is, based on the volume of pretreated water, H 2 O 2 Dosing amount 3600mg / L, FeSO 4 ·7H 2 The dosage of O is 54000mg / L. Fenton oxidation reaction time is 3 hours, and then the water after Fenton reagent treatment is adjusted to 8~10 according to the daily addition of 5kg potassium hydroxide, and enters the air flotation tank, the air flotation gas-solid ratio is 0.05, and the surface load is 15m 3 / m 2 ·H, the residence time is 15 minutes, the COD of the effluent after tre
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