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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

Inactive Publication Date: 2007-09-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] How to effectively combine Fenton's reagent with air flotation to treat wastewater and overcome the problems that exist when Fenton's reagent is used to treat wastewater has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The integrated water treatment method of Fenton and air flotation was used to carry out advanced treatment of the biochemical effluent of landfill leachate in Guangdong. Treated water volume: 10t / h, COD value of influent water is 300mg / L. First, through the Fenton reagent treatment, the hydrogen peroxide and ferrous sulfate heptahydrate solution are added to the wastewater with a metering pump, and the dosage of the agent is according to: Fe 2+ with H 2 o 2 The molar ratio of hydrogen peroxide to COD in water to be treated is 0.8:1, that is, H 2 o 2 Dosage 240mg / L, FeSO 4 ·7H 2 O dosage 900mg / L. The Fenton oxidation reaction time is 2.5 hours, and then the water after the Fenton reagent treatment is added with sodium hydroxide to adjust the pH value to 6-7, and the sodium hydroxide added every day is 50 kg. Enter the 1.5m-high air flotation tank, add sodium polyacrylate at 5 mg / L, add 1.2 kg of sodium polyacrylate every day, react for 15 minutes to form flocs, an...

Embodiment 2

[0031] Wastewater from a chemical plant, the water volume is 3t / h, and the average COD content of the effluent after secondary biochemical treatment is 120mg / L, which is slightly higher than the wastewater discharge standard. This wastewater has been biochemically treated, and most of the organic matter in the water is difficult to be further biochemically treated. The Fenton and air flotation integrated water treatment method of the present invention is used to treat the water as follows: first, through the pretreatment of the Fenton reagent, the hydrogen peroxide and heptahydrate are mixed with a metering pump. Ferrous sulfate solution is added to waste water, wherein Fe 2+ with H 2 o 2 The molar ratio is 0.05:1, and the mass ratio of hydrogen peroxide to COD in water to be treated is 0.3:1, that is, based on the volume of pretreated water, H 2 o 2 Dosage 36mg / L, FeSO 4 ·7H 2 O dosage 30mg / L. The chemical oxidation reaction time is 0.5 hours, and then the water pretrea...

Embodiment 3

[0033] The integrated water treatment method of Fenton and air flotation was used to treat the wastewater of a certain wharf in Zhuhai. The COD of wastewater is 1200mg / L, and the amount of treated water is 10t / d. First, it is treated by Fenton reagent, and hydrogen peroxide and ferrous sulfate heptahydrate solution are added to the wastewater with a metering pump, wherein Fe 2+ with H 2 o 2 The molar ratio of H 2 o 2 Dosage 3600mg / L, FeSO 4 ·7H 2 O dosage 54000mg / L. The Fenton oxidation reaction time is 3 hours, and then the water treated with Fenton reagent is adjusted to a pH value of 8-10 according to the addition of 5kg of potassium hydroxide per day, and then 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, and the COD of the effluent after treatment is 90mg / L, reaching the discharge standard.

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PUM

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Abstract

The invention discloses a Fenton and air-float integral water disposal method, which comprises the following steps: adding Fenton agent into armed waste water; setting mass ratio of hydrogen dioxide solution of Fenton agent against COD of armed water at 0.3-3:1; reacting at 0.5-5 h; using alkality material to adjust Fenton agent armed water pH value at 6-10; proceeding floating treatment; setting air-float air-solid ratio at 0.03-0.06, surface loading at 7-15m3 / m2.h and stopping time at 10-40 min; removing floating contaminant and most of dissolving organic contaminant.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to utilizing Fenton's reagent to oxidize organic matter in waste water, and then efficiently remove suspended organic matter and colloids in the waste water through air flotation, thereby removing waste water Pollutants and most of the soluble, refractory biodegradable organic matter. Background technique [0002] Fenton's reagent is a commonly used catalytic oxidation reagent. It is composed of ferrous salt and hydrogen peroxide. When the pH value is low enough, under the catalysis of ferrous ions, hydrogen peroxide will decompose and produce (OH), thereby Trigger a series of chain reactions. The free radical oxidation mechanism produced by Fenton's reagent is as follows: [0003] Fe 2+ +H 2 o 2 → Fe 3+ +(OH)+OH - (1) [0004] Fe 2+ +(OH)→Fe 3+ +OH - (2) [0005] Fe 3+ +H 2 o 2 → Fe 2+ +(HO 2 )+H + (3) [0006] (HO ...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/52
Inventor 汪晓军顾晓扬陈思莉
Owner SOUTH CHINA UNIV OF TECH
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