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Deep scrap iron catalytic ozonation wastewater treatment method

An advanced treatment and ozone oxidation technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of non-recovery of catalytic components, catalyst consumption, etc., to achieve no heavy metal pollution Risk, material cost reduction, catalytic effect will not be reduced

Inactive Publication Date: 2015-04-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is consumed during this process and the catalytic components cannot be recovered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Short-term passivation modification with concentrated nitric acid

[0023] (1) Select the waste iron filings produced in metal processing, and pretreat it; the pretreatment refers to using 1mol / L of NaOH to wash off the greasy iron filings surface according to the dirt on the iron filings surface, using 1% H 2 SO 4 Wash away the rust on the surface of iron filings.

[0024] Take the iron filings after step (1) degreasing and derusting, and use a concentration of 68% HNO 3 Soak, passivate the reaction on a shaker for 0.5 hr, take it out, wash and dry, and form a dense film composed of Fe(II) and Fe(III) on the surface, and prepare it as a catalytic material;

[0025] Catalytic O 3 Oxidation performance: The secondary biochemical effluent of a sewage treatment plant in a chemical industry park has a COD of 135 mg / L. o 3 The residence time of catalytic oxidation pool is 20min; O 3 The dosage is 85mg / L, and the bulk density of the catalytic material is 200...

Embodiment 2

[0026] Example 2: long-term passivation modification with concentrated nitric acid

[0027] Step (1) is the same as embodiment step (1).

[0028] Take the iron filings after step (1) degreasing and derusting, and use a concentration of 68% HNO 3 Soak, passivate the reaction on a shaker for 3.0 hr, take it out, wash and dry, and form a dense film composed of Fe(II) and Fe(III) on the surface, and prepare it as a catalytic material;

[0029] Catalytic O 3 Oxidation performance: The secondary biochemical effluent of a sewage treatment plant in a chemical industry park has a COD of 140 mg / L. o 3 The residence time of catalytic oxidation pool is 20min; O 3 The dosage is 100mg / L, and the bulk density of the catalytic material is 200 kg / M 3 . After the catalytic oxidation reaction, the COD was 50 mg / L, the removal rate was 64%, and the total iron content of the formed iron compound was 20 mg / L. Subsequent coagulation and sedimentation unit, dosing PAM is 1 mg / L, effluent COD i...

Embodiment 3

[0030] Example 3: short-time passivation modification of concentrated sulfuric acid

[0031] Step (1) is the same as embodiment step (1).

[0032] Take the iron filings after step (1) degreasing and derusting, and use concentration of 98% H 2 SO 4 Soak, passivate the reaction on a shaker for 0.5 hr, take it out, wash and dry, and form a dense film composed of Fe(II) and Fe(III) on the surface, and prepare it as a catalytic material;

[0033] Catalytic O 3 Oxidation performance: The secondary biochemical effluent of a sewage treatment plant in a chemical industry park has a COD of 130 mg / L. o 3 The residence time of catalytic oxidation pool is 20min; O 3 The dosage is 90mg / L, and the bulk density of the catalytic material is 200 kg / M 3 . After the catalytic oxidation reaction, the COD was 65 mg / L, the removal rate was 50%, and the total iron content of the formed iron compound was 45 mg / L. Subsequent coagulation and sedimentation unit, dosing PAM is 1 mg / L, effluent COD...

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PUM

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Abstract

The invention relates to a deep scrap iron catalytic ozonation wastewater treatment method. The deep scrap iron catalytic ozonation wastewater treatment method is characterized in that (1) a passivation layer is formed on surface of scrap iron through chemical modification, wherein main components of the passivation layer are Fe(II) and Fe(III) oxides, so that a heterocatalysis oxidation mechanism to O3 is formed; (2) a certain amount of ion-state Fe<2+> and Fe<3+> are formed by virtue of scrap iron not subjected to surface modification during oxidation of O3, so that an in-phase catalysis oxidation mechanism to O3 is formed; and (3) a certain amount of iron ions are also produced when the surface modified iron ions are used as a catalyst. The surface modified iron ions can be taken as a coagulate flocculating agent, and a coagulant aid is added to form a coagulating sedimentation or contact filtration mechanism, so that the iron ions are removed, and organic matters in the water can be further removed. During catalytic ozonation of the prepared catalyst, COD removal rate of secondary biochemical treated effluent of general industrial wastewater is 50-80%, and the new national discharge standard requirement can be completely met, so that application value is not influenced.

Description

technical field [0001] The invention relates to the field of water pollution control, in particular to a method for advanced treatment of wastewater by catalytic ozonation of iron scraps. Background technique [0002] The application of ozone in water treatment has a long history. In the field of water supply treatment: as a disinfectant, ozone can effectively kill pathogenic microorganisms, and can avoid the chlorinated disinfection by-products produced during disinfection with chlorine gas. A mature ozone disinfection process has been formed; adding ozone at the front end of biological activated carbon can It plays the role of algae and deodorization, and at the same time, it oxidizes and decomposes the macromolecular organic matter existing in natural water bodies into small molecular organic matter, which helps the subsequent degradation of microorganisms in biological activated carbon, forming an ozone-biological activated carbon process. In the field of sewage treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J23/745
Inventor 马鲁铭吴瑾马捷汀
Owner TONGJI UNIV
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