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 overcom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 polyacrylate ...

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 time ...

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 treatment ...

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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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