Method and system for carrying out electrocatalytic oxidation treatment on chemical nickel wastewater

An electrocatalytic oxidation and treatment system technology, which is applied in the field of electrocatalytic oxidation treatment of chemical nickel wastewater, can solve the problems of high cost, rising prices of chemical raw materials, strong dependence on chemicals, etc.

Pending Publication Date: 2019-05-28
JIANGSU JINGYUAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the Fenton oxidation method and the sodium hypochlorite oxidation method require the addition of chemical agents, such as acids, alkalis, sodium hypochlorite, hydrogen peroxide, ferrous salts, etc., which are highly dependent on agents and require high treatment costs.
With the continuous increase of environmental protection, the prices of various chemical raw materials are constantly rising, and the cost of traditional treatment methods that rely on chemical agents is also getting higher and higher.

Method used

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  • Method and system for carrying out electrocatalytic oxidation treatment on chemical nickel wastewater
  • Method and system for carrying out electrocatalytic oxidation treatment on chemical nickel wastewater
  • Method and system for carrying out electrocatalytic oxidation treatment on chemical nickel wastewater

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Experimental program
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Effect test

Embodiment 1

[0093] Such as figure 1 , 2 , Shown in 3, a kind of electrocatalytic oxidation treatment method of chemical nickel waste water, concrete steps are:

[0094] 1) Transport nickel-containing wastewater to the electrocatalytic oxidation reactor 1;

[0095] 2) In the electrocatalytic oxidation reactor 1, the nickel-containing wastewater is electrocatalytically oxidized;

[0096] 3) enter in the coagulation reaction box 2, carry out neutralization reaction;

[0097] 4) enter in clarifier 3, clarify;

[0098] 5) Enter the biochemical treatment device 4 for biochemical treatment.

[0099] In order to further explain this embodiment, it needs to be said that,

[0100] In step 1), nickel-containing wastewater enters the electrocatalytic oxidation reactor 1 from the water inlet 109;

[0101] In step 2), the nickel-containing wastewater is subjected to electrocatalytic oxidation under the action of the anode 103 and the cathode 104, and the electrolyzed wastewater flows out from the...

Embodiment 2

[0134] Such as figure 1 , 2 , 3, a chemical nickel wastewater electrocatalytic oxidation treatment system, comprising: electrocatalytic oxidation reactor 1, coagulation reaction box 2, clarifier 3, biochemical treatment device 4;

[0135] The electrocatalytic oxidation reactor 1 is connected to the coagulation reaction box 2, and is used for electrocatalytic oxidation of nickel-containing wastewater;

[0136] The coagulation reaction box 2 is connected with the clarifier 3, and is used for converting free nickel into nickel hydroxide precipitation by inputting lime milk or liquid caustic soda, coagulant and coagulant aid;

[0137] The clarifier 3 is connected with the biochemical treatment device 4, and is used to obtain clear water through clarification;

[0138] The biochemical treatment device 4 is used to treat the clarified water through microorganisms to obtain standard water.

[0139] A further improvement of the present invention is that,

[0140] The electrocataly...

Embodiment 3

[0159] Such as figure 1 , 2 , shown in 3, a kind of electrocatalytic oxidation treatment method of chemical nickel waste water, chemical nickel waste water is the waste water of chemical nickel plating process production line, total nickel concentration is 400mg / L, pH is between 8~9, COD is about 1000mg / L, conductivity The rate is about 20000μS / cm. The chemical nickel wastewater is transported to the electrocatalytic oxidation reactor 1 by pumping. The electrocatalytic oxidation reactor 1 is arranged in two stages. Catalytic oxidation reaction, the waste water enters the second-stage reactor after completing the initial "complexation breaking" in the first-stage reactor, and the total nickel concentration in the effluent is 200mg / L, and all nickel is transformed from a complexed state It is in a free state and flows out from the water outlet 110.

[0160] The waste water flowing out from the water outlet 110 is buffered by the buffer tank, and then pumped to the coagulation...

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Abstract

The invention discloses a technology for carrying out electrocatalytic oxidation treatment on chemical nickel wastewater. The technology is characterized by taking an inactive metal oxide compound electrode as an electrode, forming intermediate products such as hydroxyl radicals with strong oxidizing properties through catalysis under the action of an electric field, enabling the intermediate products to react with an inorganic or organic ligand of nickel, and oxidizing the inorganic or organic ligand into micromolecules such as carbon dioxide and water or oxidizing the inorganic or organic ligand into orthophosphate radicals, thus achieving the purpose of 'decomplexation'. The technology disclosed by the invention has the characteristics that an oxidizing agent requires not to be added, reaction conditions are gentle, the decomplexation effect is good, the running cost is low, the system is simple, stable and reliable, the automation degree is high, and the like.

Description

technical field [0001] The invention belongs to the field of environmental engineering, in particular to an electrocatalytic oxidation treatment method and system for chemical nickel wastewater. Background technique [0002] The chemical nickel wastewater mainly comes from the chemical nickel plating process, which contains heavy metal nickel, hypophosphite, phosphite, and hypophosphite, and the heavy metal nickel exists in a complex state. Improper treatment will lead to nickel, phosphorus, and COD exceeding the standard at the same time. Different from general complex wastewater, the ligands of chemical nickel wastewater contain both organic complexing agents and inorganic complexing agents. Most of the organic complexing agents are ligands such as citric acid, and most of the inorganic ligands are phosphite. The ligands of chemical nickel wastewater include both organic and inorganic ligands, and the process of "breaking complex" of chemical nickel wastewater is more comp...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/16
Inventor 李武林姚志全何家平朱琼芳袁志清王金雷游智林陈晓锋
Owner JIANGSU JINGYUAN ENVIRONMENTAL PROTECTION
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