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Composite catalyst for coking wastewater treatment and preparation method thereof

A composite catalyst, coking wastewater technology, applied in oxidation water/sewage treatment, physical/chemical process catalysts, chemical instruments and methods, etc. problems such as reproduction, to achieve the effect of easy large-scale industrial production, improved COD removal rate, and low cost

Pending Publication Date: 2022-04-12
CCTEG CHINA COAL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Coking wastewater contains more toxic substances such as cyanide, aromatic and heterocyclic compounds, which are toxic and inhibitory to microorganisms, and will reduce the treatment effect of microbial coking wastewater
(3) High concentration of organic matter in coking wastewater
Its COD is very large, which can exceed 10000mg / L, and its biodegradability is poor, which belongs to the difficult biochemical wastewater; (4) NH in coking wastewater 3 -N, TN are high, C / N value is very low, excess nitrogen source, insufficient carbon source, affect the growth and reproduction of microorganisms, if no denitrification treatment is added, it is difficult to meet the emission standard

Method used

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  • Composite catalyst for coking wastewater treatment and preparation method thereof
  • Composite catalyst for coking wastewater treatment and preparation method thereof

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preparation example Construction

[0024] The embodiment of the present invention also provides a method for preparing a composite catalyst for coking wastewater treatment, comprising the following steps:

[0025] a. Mix the salt solution of the active components Fe, Cu and Ni and the salt solution of the auxiliary agent Cd to obtain the impregnation solution;

[0026] b. adding a carrier into a granulator, spraying the impregnation solution on the carrier, and granulating to obtain pellets;

[0027] c. Drying and calcining the pellets to prepare a spherical catalyst.

[0028] The preparation method of the composite catalyst for coking wastewater treatment in the embodiment of the present invention adopts the pelletizing method to prepare the catalyst, and the powder particles are agglomerated under the action of liquid bridge and capillary force to form micronuclei, and the friction force generated by the rotation of the container Under the impact of rolling and rolling, it will continue to rotate and grow in...

Embodiment 1

[0033] Mix ferric nitrate, copper nitrate, nickel nitrate, and cadmium nitrate with water to form an impregnation solution, and add the carrier γ-Al in small amounts and multiple times in the granulator 2 o 3 , while spraying the impregnating solution on the carrier, so that the carrier and the components of the impregnating solution are fully mixed, slowly grow into balls, sieve out 3-5mm small balls, after 24 hours of development, dry and roast at 500°C for 4 hours to obtain a spherical catalyst.

[0034] In the spherical catalyst prepared in this example, the total loading of active components Fe, Cu and Ni oxides was 5%, and the mass ratio of Fe, Cu, Ni and Cd oxides was 1:2:2:0.5.

[0035] Catalyst stability test: Soak the catalyst in a simulated water sample composed of quinoline, nitrobenzene, hydroquinone, isopentyl glycol, n-heptane, etc., with a COD value of about 240mg / L, and set After shaking on a shaking table, the concentration of metal ions in the water was mea...

Embodiment 2

[0041] The method is the same as that of Example 1, except that in the prepared spherical catalyst, the total loading of active components Fe, Cu and Ni oxides is 6%.

[0042] The catalytic performance test of the catalyst prepared in this embodiment is shown in Table 6.

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Abstract

The invention discloses a composite catalyst for coking wastewater treatment, the composite catalyst comprises a carrier, an active component and an auxiliary agent, the carrier comprises gamma-Al2O3, the active component is an oxide of Fe, Cu and Ni, and the auxiliary agent is a Cd oxide. In the active component, the mass ratio of Fe oxide to Cu oxide to Ni oxide is 1: (1.5-7): (1.5-7); the mass of the auxiliary agent Cd oxide is 20-70% of the mass of the active component Fe oxide; the loading capacity of the active component metal oxide is 5-10% based on the total mass of the catalyst. According to the composite catalyst for coking wastewater treatment, the raw materials are easy to obtain, the cost is low, the preparation method is simple, high-concentration coking wastewater can be effectively treated, and the COD removal rate can reach 85%.

Description

technical field [0001] The invention belongs to the technical field of coking wastewater treatment, in particular relates to a composite catalyst for coking wastewater treatment, and in particular to a preparation method of the catalyst. Background technique [0002] Coking wastewater is one of the refractory industrial wastewater. It is a high-concentration refractory organic wastewater mainly composed of phenols and nitrogen heterocyclic substances. The main sources include direct steam condensation and separation water and washing water in the tar refining process; direct cooling water for gas final cooling, direct steam condensation and separation water for crude benzene processing, direct steam condensation water for refined benzene processing engineering; workshop floor or equipment Washing water and residual ammonia formed from water contained in coal, etc. It is difficult for coking wastewater to meet the effluent standard by conventional biological methods, which i...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/02B01J35/08C02F1/72C02F1/78C02F101/30C02F101/32C02F101/34C02F101/38
Inventor 钟金龙丁华毛学锋李文博王吉坤王琦王冠宇曲思建马博文吴艳何毅聪赵鹏
Owner CCTEG CHINA COAL RES INST
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