CN215288099U

CN215288099U - Reaction system for removing cyanide in wastewater

Info

Publication number: CN215288099U
Application number: CN202120818727.6U
Authority: CN
Inventors: 孙江东
Original assignee: Wuxi Dongyuan Environmental Technology Co ltd
Current assignee: Wuxi Dongyuan Environmental Technology Co ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-12-24
Anticipated expiration: 2031-04-21

Abstract

The utility model relates to a reaction system for removing cyanide in wastewater, which comprises a cyanide water storage barrel and an electrolytic bath which are communicated by pipelines; the cyanide water storage barrel comprises a barrel body; the top of the barrel body is provided with a first inlet, and the bottom of the barrel body is provided with a first outlet; the electrolytic cell comprises a cell body; the upper part of the tank body is provided with a second outlet, and the lower part of the tank body is provided with a second inlet; the first inlet and the second outlet are connected through a first pipeline; the first outlet and the second inlet are connected through a second pipeline; an electrode is arranged in the groove body; the electrodes comprise an anode and a cathode; the spacing between the anode and cathode was 100 mm. The utility model can effectively remove the cyanogen pollution in the wastewater.

Description

Reaction system for removing cyanide in wastewater

Technical Field

The utility model relates to a waste water treatment device technical field, in particular to get rid of cyanide reaction system in waste water.

Background

Cyanide is a compound containing carbon-nitrogen radicals, widely existing in organic or inorganic form. Hydrogen cyanide is the most common form, present as a colorless gas or liquid, with a slight almond flavor. When cyanide is combined with metal ions and organic compounds, simple or complex salts and compounds are formed, most commonly hydrogen cyanide, sodium cyanide and potassium cyanide. Hydrogen cyanide is a very dangerous fire hazard when exposed to high temperatures, flames and oxidants. All forms of cyanide are toxic, especially hydrogen cyanide, which is fatal.

At present, the common method for removing cyanide in wastewater in the existing industry is as follows:

two-step cyanogen breaking: the first step is as follows: adding liquid caustic soda, adjusting the pH value to 11-11.5, adding sodium hypochlorite, and controlling the ORP: 300 mV and 20-30min of reaction. The second step is that: adding dilute acid, adjusting the pH value to 7.0-8.0, adding sodium hypochlorite, and controlling the ORP: 600 mV, and 20-30min of reaction. After complete reaction, the wastewater is discharged to the next procedure for treatment (the reaction time can be properly adjusted according to the concentration in the wastewater).

The chemical reaction formula is as follows: phi CN^-+OCl^-+H₂O→CNCl+2OH^-

CNCl+2OH^-→CNO^-+Cl^-+H₂O

②2CNO^-+3ClO^-+H₂O→2CO₂+N₂+3Cl^-+2OH^-

The prior art has the following defects:

1. the two-step cyanogen breaking needs to use a large amount of NaClO, acid, alkali and other medicaments, and the treatment cost is high.

2. Meanwhile, the NaClO medicament and the reaction process can generate peculiar smell to cause secondary environmental pollution, an exhaust device is required to be added, and the investment cost is increased.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model discloses a get rid of cyanide reaction system in waste water.

The utility model discloses the technical scheme who adopts as follows:

a reaction system for removing cyanide in wastewater comprises a cyanide water storage barrel and an electrolytic bath which are communicated through pipelines; the cyanide water storage barrel comprises a barrel body; the top of the barrel body is provided with a first inlet, and the bottom of the barrel body is provided with a first outlet; the electrolytic cell comprises a cell body; a second outlet is formed in the upper part of the tank body, and a second inlet is formed in the lower part of the tank body; the first inlet and the second outlet are connected through a first pipeline; the first outlet and the second inlet are connected through a second pipeline; an electrode is arranged in the groove body; the electrodes comprise an anode and a cathode; the spacing between the anode and cathode was 100 mm.

The method is further technically characterized in that: and the second pipeline is sequentially provided with a first ball valve, a circulating pump, a check valve and a second ball valve.

The method is further technically characterized in that: the anode is made of graphite, and the plate thickness of the anode is 2.5-3.0 mm.

The method is further technically characterized in that: the cathode is made of stainless steel, and the plate thickness of the cathode is 2.5-3.0 mm.

The method is further technically characterized in that: the electrodes are electrically connected to the rectifier.

The method is further technically characterized in that: the voltage of the rectifier is 6V-8.5V.

The method is further technically characterized in that: a liquid level meter is inserted into the cyanide water storage barrel; the liquid level meter is sequentially provided with a high liquid level and a low liquid level from top to bottom.

The utility model has the advantages as follows:

1. compared with a chemical treatment method, the utility model has low cost, better cyanide removing effect and lower energy consumption.

2. The utility model discloses the sludge volume that the post processing produced is lower, reduces the continuous accumulation of cyanide pollution to avoid leading to polluting water and soil.

3. The utility model discloses simple structure, safe in utilization, simple and convenient, swift.

Drawings

Fig. 1 is a schematic view of the present invention.

In the figure: 1. a cyanide water storage barrel; 101. a first inlet; 102. a first outlet; 2. a liquid level meter; 201. high liquid level; 202. a low liquid level; 3. an electrode; 4. a rectifier; 5. an electrolytic cell; 501. a first outlet; 502. a first inlet; 6. a circulation pump; 7. a first ball valve; 8. a check valve; 9. a second ball valve; 10. a first conduit; 11. a second conduit.

Detailed Description

The foregoing and other features, aspects and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Therefore, the directional terminology used is for the purpose of description and is not intended to be limiting, and moreover, like reference numerals will be used to refer to like elements throughout.

The following describes a specific embodiment of the present embodiment with reference to the drawings.

Fig. 1 is a schematic view of the present invention. As shown in figure 1, the reaction system for removing cyanide in wastewater comprises a cyanide water storage barrel 1 and an electrolytic bath 5 which are communicated through pipelines. The cyanide water storage barrel 1 comprises a barrel body. The top of the barrel body is provided with a first inlet 101, and the bottom of the barrel body is provided with a first outlet 102. The electrolytic cell 5 includes a cell body. The upper part of the tank body is provided with a second outlet 501, and the lower part of the tank body is provided with a second inlet 502. The first inlet 101 and the second outlet 501 are connected by a first conduit 10. The first outlet 102 and the second inlet 502 are connected by a second pipe 11. The cell body is provided with an electrode 3. The electrodes 3 include an anode and a cathode. The spacing between the anode and cathode was 100 mm.

And the second pipeline 11 is sequentially provided with a first ball valve 7, a circulating pump 6, a check valve 8 and a second ball valve 9. The first ball valve 7 and the second ball valve 9 are used for controlling the circulation or the blockage of the second pipeline 11, so as to ensure the blockage between the cyanide water storage barrel 1 and the electrolytic bath 5, and the check valve 8 is used for blocking the medium backflow.

The anode is made of graphite, and the plate thickness of the anode is 2.5 mm-3.0 mm. The cathode was made of stainless steel of type SUS304, and the plate thickness of the cathode was 2.5mm to 3.0 mm. The electrode 3 with the over-high hydrogen content in the chlorine is electrically connected with a rectifier 4. Preferably, the voltage of the rectifier 4 is 6V to 8.5V.

A liquid level meter 2 is inserted into the cyanide water storage barrel 1. The liquid level meter 2 is provided with a high liquid level 201 and a low liquid level 202 in this order from top to bottom. The liquid level meter 2 monitors the water level condition in the cyanide water storage barrel 1, avoids the situation that the liquid level of the electrolytic tank 5 is difficult to control when the current is uncertain, the liquid level of the electrolytic tank 5 cannot follow the change of the current, the concentration of light alkali is high and low, the evaporation steam consumption is increased, the concentration of the alkali is high, the side reaction of the electrolytic tank 5 is increased, and the oxygen content in chlorine is increased.

The working principle of the utility model is as follows:

the utility model relates to a batch processing mode. The residence time of the electrolytic cell is calculated according to 0.5h, the anode of the electrode 3 adopts graphite, and the thickness of the polar plate is 2.5-3.0 mm; the cathode of the electrode 3 is made of SUS304 steel plate 2.5 mm-3.0 mm. The distance between the anode plate and the cathode plate is 100mm, and the voltage of the cell is 6V-8.5V. The low-flow and low-pressure pump is selected for the flow of the circulating pump 6, so that the retention time of the wastewater in the electrolytic bath 5 is ensured.

The electrolytic bath 5 is supplied with water first and then with electricity. The amount of NaCl added to the electrolytic bath 5 is 1.5-2.0g/L, and can be increased appropriately according to the concentration of cyanide in the wastewater.

Specifically, the method comprises the following steps:

the simple cyanide and the complex cyanide in the wastewater are electrolyzed by the electrolytic bath 5 to produce chemical reactions at the anode and the cathode, and the cyanide is electrolytically oxidized into carbon dioxide and nitrogen. The cyanogen pollution in the wastewater can be effectively removed by utilizing the principle.

(1) Chemical reaction occurring at the anode

For simple cyanides, the first stage reaction is:

CN-+2OH^--2e→CNO^-+H₂O

the reaction proceeds very vigorously, followed by two reactions in a second stage:

2CNO^-+4OH-6e→2CO₂↑+N₂↑+2H₂O

CNO^-+2H₂O→NH₄ ⁺+3CN^-

during electrolysis, a portion of the ammonium is produced.

For the coordination cyanide, the reaction process is as follows: (copper is used here as an example)

Cu(CN)₃ ^2-+6OH^--6e→Cu++3CNO^-+3H₂O

Cu(CN)₃ ^2-→Cu++3CN^-

The following reactions occur when salt is added to the electrolytic medium:

2Cl^--2e→2[Cl]

2[Cl]+CN^-+2OH^-→CNO^-+2Cl^-+H₂O

6[Cl]+Cu(CN)₃ ^2-+6OH^-→Cu⁺+3CNO^-+6Cl^-+3H₂O

6[Cl]+2CNO^-+4OH^-→2CO₂↑+N₂↑+6Cl^-+2H₂O

(2) chemical reaction generated at the cathode

2H⁺+2e→H₂↑

Cu²⁺+2e→Cu

Cu²⁺+2OH-→Cu(OH)₂↓

An operator respectively samples for cyanide detection after the electrolytic bath 5 works for 0.5h and 1h, the removal rate of the hydrogen cyanide is measured to be 88.6% after the electrolytic bath 5 works for 0.5h, the removal rate of the hydrogen cyanide is measured to be 98.3% after the electrolytic bath 5 works for 1h, and experimental data prove that the cyanide removal effect of the invention is better.

In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made without departing from the basic structure of the invention.

Claims

1. A reaction system for removing cyanide in wastewater is characterized in that: comprises a cyanide water storage barrel (1) and an electrolytic bath (5) which are communicated by pipelines; the cyanide water storage barrel (1) comprises a barrel body; the top of the barrel body is provided with a first inlet (101), and the bottom of the barrel body is provided with a first outlet (102); the electrolytic cell (5) comprises a cell body; the upper part of the tank body is provided with a second outlet (501), and the lower part of the tank body is provided with a second inlet (502); the first inlet (101) and the second outlet (501) are connected through a first pipeline (10); the first outlet (102) and the second inlet (502) are connected through a second pipeline (11); an electrode (3) is arranged in the groove body; the electrodes (3) comprise an anode and a cathode; the spacing between the anode and cathode was 100 mm.

2. The reaction system for removing cyanide from wastewater as set forth in claim 1, wherein: and the second pipeline (11) is sequentially provided with a first ball valve (7), a circulating pump (6), a check valve (8) and a second ball valve (9).

3. The reaction system for removing cyanide from wastewater as set forth in claim 1, wherein: the anode is made of graphite, and the plate thickness of the anode is 2.5-3.0 mm.

4. The reaction system for removing cyanide from wastewater as set forth in claim 1, wherein: the cathode is made of stainless steel, and the plate thickness of the cathode is 2.5-3.0 mm.

5. The reaction system for removing cyanide from wastewater as set forth in claim 1, wherein: the electrode (3) is electrically connected with the rectifier (4).

6. The reaction system for removing cyanide from wastewater as set forth in claim 5, wherein: the voltage of the rectifier (4) is 6-8.5V.

7. The reaction system for removing cyanide from wastewater as set forth in claim 1, wherein: a liquid level meter (2) is inserted into the cyanide water storage barrel (1); the liquid level meter (2) is sequentially provided with a high liquid level (201) and a low liquid level (202) from top to bottom.