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Method for treating high-concentration nickel-phosphorus-containing organic waste liquid through electrolytic oxidation

A technology of electrolytic oxidation and organic waste liquid, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, filtration treatment, etc., can solve the problems of low COD removal rate, high cost, complex process, etc.

Inactive Publication Date: 2020-06-26
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems of low removal rate of nickel, total phosphorus and COD in the nickel-containing and phosphorus-containing organic waste liquid in the above-mentioned prior art, the process is complicated, and the cost is high, the present invention provides an electrolytic oxidation treatment of high-concentration nickel-containing and phosphorus-containing organic waste liquid Methods

Method used

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  • Method for treating high-concentration nickel-phosphorus-containing organic waste liquid through electrolytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Accurately weigh 6 L of high-concentration nickel- and phosphorus-containing organic waste liquid with a metering device, apply a pulse electric field (pulse frequency 1000HZ, duty cycle 0.5), and a current density of 250 A / m 2 , after electrolysis for 24 h, electrolysis product Ⅰ (purity 86%) and electrolyte were obtained;

[0021] (2) Take 200 mL of the electrolyte solution obtained in step (1), add calcium oxide (15 g calcium oxide), adjust the pH to 14, stir and react for 4 h, and obtain leaching filter residue II and filtrate A after separation;

[0022] (3) Adjust the pH of the A filtrate obtained in step (2) to 4, add ferric chloride and ferrous sulfate heptahydrate (ferrous chloride 1.5 g, ferrous sulfate heptahydrate 1.5 g), and stir for 20 min;

[0023] (4) Add hydrogen peroxide and sodium hypochlorite (hydrogen peroxide 12 g, sodium hypochlorite 12 g) to the filtrate in step (3), add a small amount of PAM, stir and react for 4 hours, pour it into a solid-...

Embodiment 2

[0027] (1) Accurately weigh 6 L of high-concentration nickel- and phosphorus-containing organic waste liquid with a metering device, apply a pulse electric field (pulse frequency 1000HZ, duty cycle 0.5), and a current density of 300 A / m 2 , after electrolysis for 24 h, electrolysis product Ⅰ (purity 85%) and electrolyte were obtained;

[0028] (2) Take 200 mL of the electrolyte solution obtained in step (1), add calcium oxide (20 g calcium oxide), adjust the pH to 14, stir and react for 4 h, and obtain leaching filter residue II and filtrate A after separation;

[0029] (3) Adjust the pH of the A filtrate obtained in step (2) to 4, add ferric chloride and ferrous sulfate heptahydrate (2 g of ferrous chloride, 2 g of ferrous sulfate heptahydrate), and stir for 20 min;

[0030] (4) Add hydrogen peroxide and sodium hypochlorite (hydrogen peroxide 16 g, sodium hypochlorite 16 g) to the liquid in step (3), add a small amount of PAM, stir and react for 4 hours, pour into the solid-l...

Embodiment 3

[0034] (1) Accurately weigh 6 L of high-concentration nickel- and phosphorus-containing organic waste liquid with measuring equipment, apply a pulse electric field (pulse frequency 1000HZ, duty ratio 0.5), and a current density of 200 A / m 2 , after electrolysis for 24 h, electrolysis product Ⅰ (purity 84%) and electrolyte were obtained;

[0035] (2) Take 200 mL of the electrolyte solution obtained in step (1), add calcium oxide (30 g calcium oxide), adjust the pH to 14, stir and react for 4 hours, and obtain leaching filter residue II and solution A after separation;

[0036] (3) Adjust the pH of the A filtrate obtained in step (2) to 4, add ferric chloride and ferrous sulfate heptahydrate additives (1.5 g of ferrous chloride, 2 g of ferrous sulfate heptahydrate), and stir for 20 min;

[0037] (4) Add hydrogen peroxide and sodium hypochlorite (hydrogen peroxide 12 g, sodium hypochlorite 16 g) to the liquid in step (3), add a small amount of PAM, stir and react for 4 hours, the...

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Abstract

The invention discloses a method for treating high-concentration organic waste liquid containing nickel and phosphorus. Based on the new thought of recycling metallic nickel in the waste liquid through electro-deposition resources and removing total phosphorus and COD in the waste liquid through advanced oxidation, the deposition efficiency of the metallic nickel and the removal rate of the totalphosphorus and the COD are improved by introducing an electric field and an advanced oxidizing agent into the electro-nickel plating waste liquid. The method comprises the following steps: recoveringmetallic nickel by adopting an electrodeposition method, removing part of total phosphorus by adding an alkaline agent, adding ferrous sulfate heptahydrate and hydrogen peroxide to oxidize hypophosphite ions in the solution into orthophosphate, and finally removing the total phosphorus by adding the alkaline agent.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of hazardous waste and resource recycling, and specifically relates to a process for recycling and utilizing useful elements in high-concentration nickel-containing phosphorus-containing organic waste liquid by electrolytic oxidation. Background technique [0002] The electroless nickel plating waste solution usually contains relatively high complexing agent and buffering agent, and nickel exists in the form of complexes. In order to make the nickel ions in the waste liquid meet the standard after treatment, oxidants such as ozone, hydrogen peroxide, potassium permanganate, sodium hypochlorite and chlorine gas are commonly used to break the network in advance and reduce COD at the same time. Some researchers compared the condition of oxidant breaking and dosage, and believed that potassium permanganate is the best oxidizing agent. In addition to oxidation and breaking, it can also conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F9/06C02F101/30
CPCC02F1/001C02F1/4672C02F1/5236C02F1/56C02F9/00C02F2101/30
Inventor 舒建成陈梦君王瑞王蓉赵馨唐陈思冯慧罗正刚陈姝媛
Owner SOUTHWEAT UNIV OF SCI & TECH
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