CN216614121U

CN216614121U - Novel electro-catalysis ammonia nitrogen wastewater treatment device

Info

Publication number: CN216614121U
Application number: CN202123278613.6U
Authority: CN
Inventors: 吴志垚; 其他发明人请求不公开姓名
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-05-27
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a novel electro-catalysis ammonia nitrogen wastewater treatment device, relates to the relevant field of electrolytic catalysis, and aims to solve the problems that in the prior art, ammonia nitrogen cannot be electrolyzed rapidly and nitrate radicals cannot be removed after the ammonia nitrogen is oxidized electrochemically. The electrolytic catalytic reaction device comprises an anode (6), a cathode (7), a stirring paddle (5), a pump (3), a filter (1), a regulating tank (2) and a power supply (4). The anode is provided with a catalyst (8) with electro-catalytic chlorine evolution activity, and the cathode is provided with a catalyst (9) of electro-catalytic reduction denitrification type. The utility model adopts the electrolysis advanced oxidation technology, mainly generates a large amount of active chlorine to rapidly oxidize ammonia nitrogen into nitrogen, part of by-products are nitrate radicals, and the nitrate radicals generate nitrogen under the action of cathode catalysis, so that the COD (chemical oxygen demand) values of ammonia nitrogen and organic sewage are greatly reduced, the aim of water treatment is fulfilled, and the reaction rate is high.

Description

Novel electro-catalysis ammonia nitrogen wastewater treatment device

Technical Field

The utility model relates to the technical field of water treatment, in particular to an electro-catalysis ammonia nitrogen wastewater treatment system.

Background

For high-concentration sewage ammonia nitrogen sewage, an air stripping method, a steam stripping method and an MAP precipitation method can be generally adopted for pretreatment, and ammonia products are recovered to compensate the operation cost; for medium-low concentration ammonia nitrogen sewage, the conventional technology adopts a biochemical method to carry out nitrification and denitrification under the action of nitrifying bacteria and denitrifying bacteria, but the action of the conventional technology can be inhibited in high-salt wastewater, and various medicaments are required to be added in the ammonia nitrogen removal reaction by biochemical method, so that the operation is inconvenient for culturing biological bacteria under the culture condition. Therefore, the electrocatalytic oxidation method is a very reliable ammonia nitrogen treatment method.

The ammonia nitrogen wastewater has complex components, most of ammonia nitrogen in the wastewater exists in the states of combined molecular ammonia, ammonia ions and free ammonia, and the ammonia nitrogen oxidation process has the following reactions: after the ammonia nitrogen is subjected to electrocatalytic oxidation, part of the ammonia nitrogen exists in a nitrate form, and the ammonia nitrogen cannot reach the discharge standard without considering byproducts.

Disclosure of Invention

The utility model aims to provide a novel electro-catalysis ammonia nitrogen wastewater treatment device. To solve the problems set forth in the background art described above.

In order to achieve the purpose, the utility model provides the following technical scheme:

a novel electro-catalysis ammonia nitrogen wastewater treatment device is characterized by comprising a catalyst with electro-catalysis chlorine evolution activity at an anode and an electro-catalysis reduction denitrification catalyst at a cathode.

In a further aspect of the present invention, the anode has a catalyst having high chlorine evolution activity, and the anode catalyst is any one of a DSA electrode, a tricobalt tetroxide electrode, and a ruthenium dioxide electrode.

As a further scheme of the utility model, the cathode catalyst has a denitrification catalyst, and the catalyst is any one of a copper electrode, a copper oxide electrode, an iron oxide electrode and a carbon electrode.

Compared with the prior art, the utility model has the beneficial effects that:

1. adjusting the pH value of the wastewater solution to 6-9, adding sodium chloride, and stirring by a stirrer to ensure that the concentration of chloride ions is above 400, the more the content of the chloride ions is, the lower the energy consumption is, and the voltage between two electrode plates of the electrode reaction is 1.3-10 v. The chlorine evolution anode material with high use stability and activity is convenient for the chlorine evolution reaction of the anode, and can promote the ammonia nitrogen conversion to be more thorough, so that the whole anode has good stability and catalytic activity.

2. Through the cathode denitrification, the catalyst uses a cheap and easily-obtained iron-copper material, the generation of nitrate byproducts is effectively avoided, the random emission and the environmental pollution are caused, the better environmental protection effect is achieved, the whole equipment is simple in structure, the occupied area is small, the operation is convenient, and the using effect is better than that of the traditional mode.

Drawings

FIG. 1 is a flow of the whole ammonia nitrogen treatment device, which comprises a pretreatment stage and an electrocatalytic ammonia nitrogen reaction stage.

FIG. 2 is a schematic diagram of the electro-catalytic cathode and anode electrodes loaded with catalyst.

FIG. 3 is a graph showing the change of ammonia nitrogen and nitrate content with time during the electrocatalytic reaction.

In fig. 1: 1, a filter; 2, adjusting a pool; 3, pumping; 4, power supply and switch; 5, a stirring paddle; 6 an anode; 7 a cathode; 8 an anode catalyst; 9 cathode catalyst.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

1. In the pretreatment stage, the waste liquid to be treated is filtered, sodium hydroxide and hydrochloric acid are added to adjust the pH of the solution to 6-9, preferably to be close to neutral, the concentration of chloride ions is adjusted to 400ppm-100000ppm, and attachments on the cathode and the anode are cleaned.

2. In the electrocatalytic nitrification and denitrification stage,

(1) the experiment was carried out using an anodic ruthenium dioxide electrode of 2cm x 2cm, a cathodic copper-copper oxide electrode of 2cm x 2cm, a stirrer was switched on, an electrolysis voltage of 2v was set, and the changes in the ammonia nitrogen and nitrate concentration with time were measured and compared with the test group without the cathodic denitrification electrode.

(2) The anode used a cobaltosic oxide electrode 2cm x 2cm, the cathode used a copper-copper oxide electrode 2cm x 2cm, the stirrer was switched on, the electrolysis voltage was set at 2v, and the ammonia nitrogen and nitrate concentration was measured as a function of time.

The test result shows that: reacting 500ml of wastewater with the initial ammonia nitrogen of 100mg/L, wherein the reaction current density reaches about 20mA, the ammonia nitrogen of effluent is reduced to 12mg/L after about 7 hours, the nitrate is reduced to below 20mg/L, and the ammonia nitrogen is reduced to about 12mg/L at the later stage. The degradation rate reaches 88 percent, namely the effluent quality reaches the discharge standard.

It is noted that in the drawings and in the description, implementation methods not shown or described are all forms known to those of ordinary skill in the art and are not described in detail. In addition, the above definitions of the respective elements are not limited to the specific structures, shapes or methods mentioned in the embodiments, and may not be simply modified or replaced. Any modification made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel electro-catalysis ammonia nitrogen wastewater treatment device is characterized by comprising an anode and a cathode, wherein the anode is provided with a catalyst with electro-catalysis chlorine evolution activity, the cathode is provided with an electro-catalysis reduction denitrification catalyst, and the two electrodes are used for electro-catalysis reaction in ammonia nitrogen wastewater.

2. The novel electrocatalytic ammonia-nitrogen wastewater treatment device as set forth in claim 1, wherein the anode has a catalyst with chlorine evolution catalytic activity, and the anode catalyst is any one of a DSA electrode, a cobaltosic oxide electrode and a ruthenium dioxide electrode.

3. The novel electro-catalysis ammonia nitrogen wastewater treatment device according to claim 1, characterized in that the cathode has a catalyst for denitrification, and the catalyst is any one of a copper electrode, a copper oxide electrode, an iron oxide electrode and a carbon electrode.