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Modified molecular sieve catalyzed ozone treatment method for coking wastewater

A technology for coking wastewater and ozone treatment, which is applied in the direction of oxidized water/sewage treatment, etc. It can solve the problems of difficult treatment of concentrated water by nanofiltration and reverse osmosis, and it is difficult for cyanide to meet high environmental standards. The effect of secondary pollution and simple process

Inactive Publication Date: 2016-06-15
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing treatment methods for coking wastewater, the indicators of cyanide, COD, and ammonia nitrogen contained in the wastewater are still difficult to meet high environmental standards, especially the nanofiltration and reverse osmosis concentrated water produced after membrane treatment. the difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Weigh 3.09g of manganese nitrate, 3.78g of cerium nitrate and 1.49g of lead nitrate into 100mL of deionized water, stir evenly to prepare a mixed solution of nitrate, and immerse 100g of spherical 4A molecular sieves with a diameter of 3mm in the solution for 4 hours , take it out and put it in an oven for drying at 100°C for 6 hours, then place it in a muffle furnace and bake at 600°C for 2 hours to obtain the desired modified molecular sieve, wherein the mass percentages of cerium, manganese, and lead oxides are respectively 1.44%, 1.44% and 0.96%.

[0016] (2) Pour the modified molecular sieve obtained in step (1) and 1000mL wastewater with a TOC concentration of 150mg / L and a temperature of 40°C into the container, inject ozone, and start stirring for 60 minutes at the same time, filter the modified molecular sieve from The TOC concentration in the treated wastewater was 33mg / L, and the removal rate was 78%.

Embodiment 2

[0018] (1) Weigh 10.12g of ferric nitrate, 5.04g of cerium nitrate and 1.49g of lead nitrate into 100mL of deionized water, stir well to prepare a mixed solution of nitrate, and immerse 100g of spherical 4A molecular sieves with a diameter of 3mm in the solution for 5 hours , take it out and put it in an oven to dry at 80°C for 4 hours, then place it in a muffle furnace and bake at 400°C for 4 hours to obtain the desired modified molecular sieve, wherein the mass percentages of cerium, iron, and lead oxides are respectively 1.9%, 1.9% and 0.95%.

[0019] (2) Pour the modified molecular sieve obtained in step (1) and 1000mL wastewater with a TOC concentration of 200mg / L and a temperature of 40°C into the container, inject ozone, and start stirring for 80 minutes at the same time, filter the modified molecular sieve from The TOC concentration in the treated wastewater was 39mg / L, and the removal rate was 80.5%.

Embodiment 3

[0021] (1) Weigh 3.09g of manganese nitrate, 3.99g of lanthanum nitrate and 1.49g of lead nitrate into 100mL of deionized water, stir evenly to prepare a mixed solution of nitrate, and immerse 100g of spherical 4A molecular sieves with a diameter of 3mm in the solution for 3 hours , take it out and put it in an oven to dry at 60°C for 5 hours, then place it in a muffle furnace and bake at 500°C for 3 hours to obtain the desired modified molecular sieve, wherein the mass percentages of lanthanum, manganese, and lead oxides are respectively 1.44%, 1.44% and 0.96%.

[0022] (2) Pour the modified molecular sieve obtained in step (1) and 1000mL wastewater with a TOC concentration of 180mg / L and a temperature of 40°C into a container, inject ozone, and start stirring for 60 minutes at the same time, filter the modified molecular sieve from The concentration of TOC in the treated wastewater was 36mg / L, and the removal rate was 80%.

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Abstract

The invention discloses a method for ozonizing coking wastewater by using a modified molecular sieve as a catalyst, which comprises the following steps: preparation of modified molecular sieve: preparing a mixed solution containing transition metal / rare-earth metal / lead nitrate, impregnating a dried spherical molecular sieve in the mixed salt solution, taking out, drying and roasting; ozone catalytic oxidation catalytic oxidation: pouring the obtained modified molecular sieve and coking wastewater, of which the total organic carbon concentration (TOC) is 50-500 mg / L and the temperature is 20-100 DEG C, into a container, introducing ozone, and stirring; and recovery of modified molecular sieve: after the ozone catalytic oxidation, filtering to separate the modified spherical molecular sieve from the solution for the next catalytic oxidation process. The method has the advantages of high treatment efficiency, no secondary pollution and low operating cost, is simple to operate, and has favorable popularization value in other industrial wastewater treatment aspects.

Description

technical field [0001] The invention belongs to the field of water treatment and environmental catalysis, and relates to a method for treating coking wastewater with catalytic ozone by modified molecular sieves. Background technique [0002] Coking wastewater is the wastewater formed during the high-temperature carbonization process of coal, and it is one of the main wastewater discharged by iron and steel enterprises. Because coking wastewater contains a large amount of organic compounds such as phenols, biphenyl, pyridine, indole, and quinoline, as well as dozens of pollutants such as cyanide, inorganic fluoride ions, and ammonia nitrogen, the composition is complex, the concentration of pollutants is high, and the chroma High, highly toxic, and very stable in nature, it is a typical industrial wastewater containing refractory organic pollutants. The composition of the wastewater is complex, and excessive discharge will cause great harm to humans, aquatic products, and cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/78
Inventor 何丹农董亚梅王婷赵昆峰
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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