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Method for recycling iron waste for fenton technology and water treating device of method

A technology of waste and Fenton, which is applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of high cost of ultraviolet photocatalytic Fenton technology, secondary pollution of water bodies, and difficulty in large-scale application, so as to achieve resource utilization and realize The effect of zero emission and easy promotion and popularization

Inactive Publication Date: 2015-12-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of organic complexing agents will cause secondary pollution to the water body; the cost of ultraviolet photocatalytic Fenton technology is high, and it is difficult to apply on a large scale
In addition, catalysts such as iron oxides, iron hydroxides, and zero-valent iron used in the heterogeneous Fenton reaction will gradually become deactivated as the number of uses increases, and the disposal of these deactivated catalysts is also an environmental work. Difficulties faced by

Method used

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  • Method for recycling iron waste for fenton technology and water treating device of method
  • Method for recycling iron waste for fenton technology and water treating device of method
  • Method for recycling iron waste for fenton technology and water treating device of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 500mL of untreated water samples containing printing and dyeing wastewater, orange G (OG) for refractory organic matter, and the pH value of the system is 3.0. Add 10mmol / L of hydrogen peroxide, 0.5g / L of ferric oxide, and 1mmol / L of hydroxylamine hydrochloride to the water sample, and stir the water sample for 10min at a rate of 300r / min. Ratio, the removal rate increased from 1% to 99%.

[0036] figure 1 It is the effect diagram of the removal of refractory organic matter in printing and dyeing wastewater in this example. The refractory organic matter is orange G (OG). The removal rate curve of degradation of organic wastewater without adding active agent.

Embodiment 2

[0038] Take 500mL of untreated water samples containing printing and dyeing wastewater, orange G (OG) for refractory organic matter, and the pH value of the system is 1.0. Add hydrogen peroxide 1mmol / L in this water sample, adopt the composition 0.1g / L of the hydroxide of different iron, wherein, the hydroxide of iron is selected from Fe(OH) 2 , Fe(OH) 3 , α-FeOOH, β-FeOOH, γ-FeOOH, or a mixture of several of them, sodium sulfite 0.1-0.4mmol / L, stirring the water sample at a rate of 300r / min for 5min, and adding no active agent Compared with the treatment, the results are shown in Table 1:

[0039] Table 1 Effects of different iron hydroxides on the removal rate of orange G under the action of activators

[0040] Iron hydroxide (0.1g / L)

[0041] It can be seen from Table 1 that by adding activator, the removal rate increased from 5% to 70%-90%. The removal rate of orange G is positively correlated with the dosage of activator, and also related to the valence state...

Embodiment 3

[0043] Take 500mL of untreated water sample containing coal chemical wastewater, in which the refractory organic matter is phenol, and the pH value of the system is 4.0. Add hydrogen peroxide 5mmol / L to this water sample, zero valent iron (Fe 0 ) 1g / L, potassium sulfite 1mmol / L, stirring the water sample at a speed of 300r / min for 20min, compared with the treatment without adding active agent, the removal rate increased from 1% to 95%.

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Abstract

The invention discloses a method for recycling iron waste for the fenton technology. The method comprises the following steps that hydrogen peroxide, the iron waste and an activating agent are added to waste water to be treated, stirring is conducted so that the iron waste can be dispersed in a reaction system, a reaction is conducted, and then solid and liquid separation is conducted, wherein the activating agent is any one or a mixture of sodium sulfite, potassium sulfite, magnesium sulfite, calcium sulfite, sodium thiosulfate, potassium thiosulfate, calcium thiosulfate, magnesium thiosulfate, sodium borohydride, potassium borohydride, hydroxylamine hydrochloride and ascorbic acid. By means of the method, various kinds of iron waste are recycled, meanwhile, zero iron mud emission is achieved, and thus pollution to the environment is effectively reduced. The invention further provides a water treating device capable of achieving the method. By means of the method and the water treating device, the reaction speed of the iron waste in the fenton system is greatly increased, the effective pH range of the fenton system is expanded, meanwhile zero iron mud emission is achieved, and thus pollution to the environment can be easily reduced.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling and chemical oxidation treatment of organic wastewater, in particular to a method for recycling iron waste to Fenton technology and a water treatment device thereof. technical background [0002] In recent years, with the rapid development of the economy, the output of various industrial wastes has been increasing day by day, and industrial iron waste is one of the most typical examples. The metallurgical and chemical industries are the two main sources of industrial iron slag. A large amount of iron-containing waste is regarded as waste or piled aside, or landfilled, which not only occupies land, pollutes the environment, but also causes a great waste of resources. Waterworks and sewage plants are also one of the sources of iron waste. When the ferric salt coagulation method is used to treat wastewater, the bottom sludge of the sedimentation tank generally contains more iron hydroxi...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 张静翁晟琳
Owner HOHAI UNIV
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