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Wastewater treatment catalyst, preparation method thereof and wastewater treatment method

A wastewater treatment and catalyst technology, applied in metallurgical wastewater treatment, physical/chemical process catalysts, water/sewage treatment, etc., can solve the problem of ineffective removal of nickel metal, inability to meet discharge standards, and inability to minimize the concentration of nickel in effluent And other issues

Active Publication Date: 2017-05-17
DONGJIANG ENVIRONMENTAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional methods for treating electroless nickel plating wastewater include: chemical precipitation, electrolysis, ion exchange, reverse osmosis and ultrafiltration, etc., but none of them can effectively remove nickel metal in wastewater, and at the same time, they cannot minimize the concentration of effluent. Nickel concentration, let alone meet the requirements of standard discharge
[0003] In addition to containing a large amount of nickel (1-7g / L), electroless nickel plating wastewater often adds a large amount of complexing agents, stabilizers, buffers and brighteners and other organic substances (10 ~30g / L); these organic substances, especially complexing agents (citric acid, tartaric acid, malic acid, succinic acid, acetic acid, etc.) have a strong complexing ability to nickel, forming stable complexes with it, electroless plating There are a large amount of phosphite and complexing agent in nickel wastewater, which makes it difficult to treat electroless nickel plating wastewater

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0030] The present invention also discloses a method for preparing the catalyst for wastewater treatment, comprising the following steps:

[0031] S110, providing a carrier with a particle size of 0.5 mm to 0.85 mm, and performing pretreatment on the carrier.

[0032] Preferably, the material of the carrier is selected from titanium dioxide, silicon dioxide, ferric oxide or aluminum oxide.

[0033] You can directly purchase commercial spherical carrier precursors with a particle size of 2mm to 4mm. After grinding, filter to obtain a carrier with a particle size of 0.5mm to 0.85mm. The obtained carrier is rinsed with deionized water for many times and dried before use. .

[0034] The operation of pretreating the carrier is pickling or surfactant treatment. Pickling may be: mixing the carrier with a nitric acid solution with a mass concentration of 5% to 25%, and refluxing at 90°C to 100°C for 1h to 3h.

[0035] S120, configuring a metal salt solution.

[0036] The pH of the...

Embodiment 1

[0059] Purchase SiO with a particle size of 2-4mm 2 , Grind and sieve it through a laboratory small grinder to prepare a carrier with a particle size of 0.5 mm to 0.85 mm. The obtained carrier was further purified to remove impurities, and deionized water was added for repeated rinsing, and finally the water was clear without impurities, and the cleaned carrier was dried in an oven at 110 degrees for 12 hours for later use.

[0060] The dried carrier was placed in 10 wt% nitric acid solution, refluxed at 90° C. for 1 hour, and the filter residue was washed and dried after filtration to obtain a pretreated carrier.

[0061] Prepare a palladium chloride solution with a concentration of 1 g / L and a pH of 4. The pH of the palladium chloride solution was adjusted with hydrochloric acid.

[0062] The pretreated carrier was mixed with a palladium chloride solution with a concentration of 1 g / L and a pH of 4, statically soaked at 20°C for 6 hours, then filtered and retained, and dri...

Embodiment 2

[0065] Take out 1.5L of electroless plating waste water and place it in an ultrasonic cleaner, add 30% (mass fraction) sodium hydroxide solution to adjust the pH of the concentrated water to 13, and the temperature is 28° C., sonicate for 20 minutes.

[0066] Add 5g of the wastewater treatment catalyst prepared in Example 1, react for 30min, let stand to separate layers, filter, and finally measure the nickel concentration in the supernatant to be 7.6mg / L, and the nickel ion removal rate is 99.5%.

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Abstract

The invention discloses a wastewater treatment catalyst, a preparation method thereof, and a wastewater treatment method adopting the wastewater treatment catalyst. The wastewater treatment catalyst comprises a carrier and an active layer deposited on the carrier, wherein the grain diameter of the carrier is 0.5 to 0.85 mm; an active metal layer is selected from at least one of the following materials of palladium, cobalt, nickel, manganese, tungsten and copper; the active metal layer accounts for 0.5 to 3 mass percent of the wastewater treatment catalyst. The wastewater treatment catalyst disclosed by the invention can be in efficient catalytic reaction and can be used for chemical nickel-plating wastewater treatment, test determination shows that complex nickel ions can be destabilized to form free nickel, spontaneous decomposition of a wastewater complex can be quickened, the free nickel can react with reductants of hypophosphite and the like remained in the chemical nickel-plating wastewater, an intense isotropic autocatalysis reaction appears in the chemical nickel-plating wastewater, and complicated insoluble chelation precipitate is formed by the chemical nickel-plating wastewater with a catalyst, phosphorus, alkali and the like.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a waste water treatment catalyst, a preparation method thereof, and a waste water treatment method using the waste water treatment catalyst. Background technique [0002] The traditional methods for treating electroless nickel plating wastewater include: chemical precipitation, electrolysis, ion exchange, reverse osmosis and ultrafiltration, etc., but none of them can effectively remove nickel metal in wastewater, and at the same time, they cannot minimize the concentration of effluent. Nickel concentration, let alone meet the requirements of standard discharge. [0003] In addition to containing a large amount of nickel (1-7g / L), electroless nickel plating wastewater often adds a large amount of complexing agents, stabilizers, buffers and brighteners and other organic substances (10 ~30g / L); these organic substances, especially complexing agents (citric acid, tartaric acid,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/34B01J23/44B01J23/72B01J23/745B01J23/75B01J23/755B01J23/888B01J23/89C02F1/36C02F1/62C02F1/66C02F101/20C02F103/16
CPCB01J23/30B01J23/34B01J23/44B01J23/72B01J23/745B01J23/75B01J23/755B01J23/888B01J23/8906C02F1/36C02F1/62C02F1/66C02F2101/20C02F2103/16
Inventor 李勇火邓国平贺德强周耀明罗璐琴
Owner DONGJIANG ENVIRONMENTAL
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