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Method of treating refractory pollutants through catalyzing H2O2 oxidation by pyrite cinder

A technology of pyrite slag and H2O2, which is applied in the directions of oxidized water/sewage treatment, water pollutants, chemical instruments and methods, etc. Poor quality and other problems, to achieve the effect of comprehensive utilization of waste, saving consumption and cost

Active Publication Date: 2011-09-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor quality of pyrite slag in our country, the difficulty of sorting, the large investment and high cost of utilization, the comprehensive utilization of pyrite slag is not ideal, and it still exists as a kind of solid waste at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 5 parts of 500mL Acid Red B simulated wastewater and place them in 1L beakers respectively, the initial concentration is 200mg / L, adjust the pH value to 3, 5, 7, 9, 11 with hydrochloric acid and sodium hydroxide in turn, add 30% H 2 o 2 Solution 15mL and pyrite slag catalyst 15g, open the six-connected agitator, take a sample at the set time point, detect the concentration and pH value of Acid Red B in the wastewater after the treatment, the results are shown in Table 1, it can be seen that the method The applicable range of pH is very wide, and the treatment effect will not be affected when the pH value is within 3-11, and after the treatment, the pH value of the system is in the neutral range, and there is no need to adjust the pH before and after the general wastewater reaction.

[0025] The influence of table 1 different initial pH on reaction effect

[0026] initial pH

Embodiment 2

[0028] Take 500mL of acid red B wastewater with an initial concentration of 200mg / L and put it in a 1L beaker, add 2.5g of pyrite slag as a catalyst, and then add 30% H 2 o 2 Solution 15mL, the initial pH of solution is neutral condition (about 7.3), carry out stirring reaction, take a sample at set time point, detect the concentration of acid red B in waste water and calculate its removal rate, the result is as shown in table 2:

[0029] Table 2 Treatment effect on dye wastewater

[0030] Reaction time

Embodiment 3

[0032]Get 3 parts of 500ml of phenol waste water and add them to 3 1L beakers respectively. The initial concentration of phenol is 60mg / L. Add 5g, 10g and 15g of pyrite slag after activation and pretreatment successively as catalysts, and then add 30 %H 2 o 2 15 mL of the solution was stirred and reacted, samples were taken at the set time points, and the concentration of phenol in the treated wastewater was detected. The results are shown in Table 3:

[0033] Table 3 Example of phenol-containing wastewater treatment after activation of pyrite slag

[0034] The amount of catalyst

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Abstract

A method of treating refractory pollutants utilizes the pyrite cinder as catalyst which forms a heterogeneous Fenton system with H2O2 to catalyze H2O2 to generate hydroxyl radical (.OH) with strong oxidability and degrade the organic pollutants efficiently and quickly. The method comprises the following steps: (1) after the waste water is added in a reactor, a given amount of pyrite cinder original sample or activated and pretreated cinder is added in the waste water; (2) H2O2 solution is added in a mixed liquid of the waste water and the pyrite cinder so as to form an analogous Fenton reagent with the pyrite cinder; (3) stirring is carried out so as to lead the pyrite cinder, the H2O2 solution and the waste water to be mixed for reaction, and the stirring is stopped at the set reaction time; and (4) standing is carried out, the pyrite cinder is quickly precipitated and the supernate is discharged, so that the pyrite cinder can be reused. The invention discovers a novel analogous Fenton oxidation catalyst, extends the resource utilization ways of the pyrite cinder, achieves the purpose of controlling waste by waste and realizes the comprehensive utilization of the waste.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering and relates to a method for removing pollutants by advanced oxidation, which is suitable for controlling water body pollution and repairing polluted water bodies. Background technique [0002] Fenton oxidation technology is an advanced oxidation technology with unique advantages. The temperature and pressure required for the reaction are mild and the reaction is rapid. It has become one of the research hotspots in the environmental field. The basic principle of Fenton's reagent is through Fe 2+ and H 2 o 2 The chain reaction between them catalyzes the generation of hydroxyl radical·OH with high oxidation ability, and its oxidation potential is second only to fluorine, as high as 2.80v. In addition, hydroxyl radical · OH also has high electronegativity and electrophilicity, so Fenton's reagent can effectively remove refractory organic substances that cannot be remove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/38C02F1/72B09B3/00B01J23/889B01J37/00C02F101/30A62D101/20
Inventor 吴德礼段冬马鲁铭
Owner TONGJI UNIV
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