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Novel Fenton oxidation method industrial wastewater treatment process

A technology of Fenton oxidation and industrial wastewater, which is applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sewage treatment, etc. It can solve the problems of little application value, Fenton reaction Fenton agent dosage increase, and increase investment and other issues, to achieve the effect of improving utilization efficiency, reducing sludge production, and improving treatment efficiency

Pending Publication Date: 2021-03-26
联合环境技术(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this operation mainly uses the reaction time several times longer than that of conventional Fenton to realize the oxidation reaction of Fenton agent to improve the treatment effect. In practical application, the investment will be greatly increased, so the application value is not great.
Moreover, the adverse effects of interfering substances in the influent of industrial wastewater on the Fenton reaction are often ignored, resulting in an increase in the realization of the dosage of Fenton agents

Method used

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  • Novel Fenton oxidation method industrial wastewater treatment process
  • Novel Fenton oxidation method industrial wastewater treatment process

Examples

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Effect test

Embodiment 1

[0097] After biochemical treatment of a certain chemical wastewater, the effluent COD is 1200mg / L, and the remaining COD is difficult to degrade further. Therefore, Fenton oxidation advanced treatment is adopted. The treatment process using the traditional Fenton is as follows: adjust the pH value of the wastewater to 6.0, add ferrous sulfate (heptahydrate) 2600mg / L, hydrogen peroxide (mass concentration 30%, the same below) 1400mg / L to a single oxidation tank, and the residence time is 80min . The Fenton treatment method invented by the invention is as follows: after pretreatment to remove part of SS, the pH value of the wastewater is adjusted to 6.0, and then enters two oxidation pools, namely the primary oxidation pool and the secondary oxidation pool, and the primary oxidation pool passes through the pipeline mixer. Add ferrous sulfate 1300mg / L and hydrogen peroxide 700mg / L successively for oxidation and precipitation, and the residence time is 40min; the secondary oxidati...

Embodiment 2

[0101] A pharmaceutical wastewater is pretreated by Fenton oxidation to improve its biodegradability and reduce its biological toxicity. The treatment process using the traditional Fenton is: adjust the pH value of the wastewater to 5.0, add 1000 mg / L of ferrous sulfate (heptahydrate, the same below) in a single oxidation tank, and add 800 mg of hydrogen peroxide (mass concentration is 27.5%, the same below) / L, residence time 60min. Adopting the Fenton treatment method of the present invention is: after the wastewater pH value is adjusted to 5.0, it enters three oxidation ponds successively, and the dosage of ferrous sulfate and hydrogen peroxide in each oxidation pond is the same (the total dosage is consistent with traditional Fenton), The residence time of wastewater in each oxidation tank is 15min, 15min, and 30min respectively. The process flow chart is as follows: figure 1 shown. The results of the two Fenton treatment methods are shown in Table 2 below. Under the sam...

Embodiment 3

[0105] The biochemical effluent of landfill leachate contains high refractory COD, and it is difficult to achieve discharge standards. Fenton oxidation is used for advanced treatment. The waste water has a small flow rate and is processed in batches. The treatment process using the traditional Fenton is: adjust the pH value of the wastewater to 5.0, add ferrous sulfate (heptahydrate, the same below) 2500mg / L at one time, and add hydrogen peroxide (mass concentration of 30%, the same below) 1300mg / L , react for 90min. The Fenton treatment method of the present invention is as follows: in the single oxidation tank, the pH value of the wastewater is first adjusted to 5.0, and then at 0min, 30min, and 60min, ferrous sulfate and hydrogen peroxide are added in equal amounts respectively (total dosage is the same as that of traditional Fenton). Dayton consistent), the process flow chart is as follows figure 2 shown. The results of the two Fenton treatment methods are shown in Tab...

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Abstract

The invention provides a novel Fenton oxidation method industrial wastewater treatment process, which comprises an oxidation step, and the oxidation step specifically comprises: introducing acid-adjusted wastewater into a Fenton oxidation tank group, which comprises one or more oxidation tanks which are connected in series, adding Fe<2 +> and H2O2 into the oxidation tanks, wherein the mass of Fe<2+> added into each oxidation tank is equal or unequal, and the mass of H2O2 added into each oxidation tank is equal or unequal. According to the process provided by the invention, the treatment efficiency of the Fenton reaction is greatly improved; or under the condition of realizing the same treatment effect and the same reaction time, the dosage of a Fenton reagent can be reduced, the reagent cost is saved, meanwhile, the sludge yield is also reduced, and the method has good environmental protection and economic benefits.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a novel Fenton oxidation industrial wastewater treatment process. Background technique [0002] Fenton oxidation is a mature advanced oxidation treatment technology. It mainly uses ferrous and hydrogen peroxide to react to generate hydroxyl radicals. The oxidation potential of hydroxyl radicals is as high as 2.8V, which is second only to fluorine (oxidation potential 3.03V). Strong oxidizing agent. Hydroxyl radicals can rapidly oxidize all organic substances and most inorganic substances almost non-selectively, and the reaction rate constant between hydroxyl radicals and organic substances is as high as 10 6 ~10 9 L / (mol·s). At present, Fenton technology has been widely used in the treatment of various refractory industrial sewage. Fenton technology can be used as an advanced treatment process at the end to further remove refractory pollutants to ensure discharge st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F9/04
CPCC02F1/725C02F1/722C02F9/00C02F2305/026C02F1/66C02F1/20C02F2001/007C02F1/5236C02F1/56C02F2209/04
Inventor 郭成洪林玉程李力阎怀国郭海军王津利
Owner 联合环境技术(天津)有限公司
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