Ferrous ion reduction and catalytic oxidation cooperation for reinforcing waste water biological treatment technology
A technology of catalytic oxidation and biological treatment, applied in the direction of reducing water/sewage treatment, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. Reduction of pollutants is not obvious and other problems, to achieve the effect of improving wastewater biological treatment effect, improving catalytic oxidation efficiency, and saving economic costs
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Embodiment 1
[0026] Taking the treatment of printing and dyeing wastewater as an example, the implementation steps are further explained.
[0027] Step 1: Weigh 27.8g of FeSO 4 ·7H 2 O dissolve it in 100mL of water without dissolved oxygen, gradually add 5mol / L anaerobic sodium hydroxide solution to the above solution, stir while adding, the molar ratio of ferrous ion and hydroxide is 0.58, and generate FHC .
[0028] Step 2: Take 20L of actual printing and dyeing wastewater and put it into a reactor (referred to as reactor A). Add the FHC solution that has been prepared in reactor A, make Fe 2+ The content is about 50 mg / L, and after stirring for 20 minutes, it precipitates, and the supernatant is transferred to a Fenton-like oxidation pool (referred to as reactor B).
[0029] Step 3: add sulfuric acid slag (dosing ratio: 10mg / L) and hydrogen peroxide (dosing ratio: 0.01ml / L) to reactor B, and return the sludge in reactor A to reactor B , the reflux ratio is 1% (the ratio of the volu...
Embodiment 2
[0032] Treatment of printing and dyeing wastewater
[0033] I: Synergistic enhancement of ferrous reduction and catalytic oxidation for wastewater biological treatment
[0034] Step 1: Take 27.8g of FeSO 4 ·7H 2O dissolve it in 100mL of water without dissolved oxygen, gradually add 5mol / L anaerobic sodium hydroxide solution to the above solution, stir while adding, the molar ratio of ferrous ion and hydroxide is 0.8, and generate FHC .
[0035] Step 2: Take 25L of actual printing and dyeing wastewater and put it into reactor A, add the prepared FHC solution to make Fe 2+ The mass concentration is 100mg / L. Stir the reaction for 60 minutes, precipitate for 30 minutes, and transfer the supernatant to reactor B.
[0036] The third step: add sulfuric acid slag (dosing ratio is 50mg / L) and hydrogen peroxide (dosing ratio is 0.1ml / L) in reactor B, and return the sludge in reactor A to reactor B, The reflux ratio was 2%, the reaction was stirred for 60 minutes, and the precipita...
Embodiment 3
[0043] Treatment of Mixed Wastewater of Nitrobenzene Wastewater and Printing and Dyeing Wastewater
[0044] I: Synergistic enhancement of ferrous reduction and catalytic oxidation for wastewater biological treatment
[0045] The first step: take 12.7g of FeCl 2 Dissolve it in 100mL of water without dissolved oxygen, gradually add 5mol / L anaerobic sodium hydroxide solution to the above solution, stir while adding, the molar ratio of ferrous ion and hydroxide is 0.3, and generate FHC.
[0046] Step 2: Take 25L of mixed waste water and put it into reactor A, add FHC solution to make Fe 2+ The mass concentration is 200mg / L. Stir the reaction for 40 minutes, precipitate for 20 minutes, and transfer the supernatant to reactor B.
[0047] The third step: add sulfuric acid slag (dosing ratio is 50mg / L) and hydrogen peroxide (dosing ratio is 0.1ml / L) in reactor B, and return the sludge in reactor A to reactor B, The reflux ratio was 3%, the reaction was stirred for 120 minutes, and...
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