CN216614121U - A new type of electrocatalytic ammonia nitrogen wastewater treatment device - Google Patents

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

A new type of electrocatalytic ammonia nitrogen wastewater treatment device

technical field

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

Background technique

For high-concentration ammonia nitrogen sewage, air stripping method, steam stripping method, and MAP precipitation method can generally be used for pretreatment, and ammonia products can be recovered to compensate for the operating cost; Under the action of nitrifying bacteria and denitrifying bacteria, nitrification and denitrification are carried out, but their effect will be inhibited in high-salt wastewater, and the biochemical removal of ammonia nitrogen requires the addition of various chemicals to provide culture conditions for culturing biological bacteria, which is inconvenient to operate. Therefore, electrocatalytic oxidation is a very reliable method for ammonia nitrogen treatment.

The composition of ammonia nitrogen wastewater is complex, and most of the ammonia nitrogen in the wastewater exists in the state of compound molecular ammonia, ammonia ions and free ammonia. The reaction in the process of ammonia nitrogen oxidation is as follows: after the electrocatalytic oxidation of ammonia nitrogen, some of it exists in the form of nitrate, which fails to Taking into account the by-products, the emission standard cannot be met.

SUMMARY OF THE INVENTION

The purpose of this utility model is to provide a novel electrocatalytic ammonia nitrogen wastewater treatment device. In order to solve the problems raised in the above background art.

To achieve the above object, the utility model provides the following technical solutions:

A novel electrocatalytic ammonia nitrogen wastewater treatment device is characterized in that: the anode has a catalyst with electrocatalytic chlorine evolution activity, and the cathode has an electrocatalytic reduction and denitrification catalyst.

As a further scheme of the present utility model: the anode has a catalyst with high chlorine evolution activity, and the anode catalyst is any one of a DSA electrode, a cobalt tetroxide electrode, and a ruthenium dioxide electrode.

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

Compared with the prior art, the beneficial effects of the present utility model are:

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

2. Through cathode denitrification, the catalyst uses cheap and readily available iron-copper materials, which effectively avoids the formation of nitrate by-products, causing random discharge to pollute the environment, and has a good environmental protection effect. The entire equipment has a simple structure and a small footprint. The operation is convenient, and the use effect is better than the traditional method.

Description of drawings

Figure 1 shows the flow of the entire device for ammonia nitrogen treatment, including the pretreatment stage and the electrocatalytic ammonia nitrogen reaction stage.

Figure 2 is a schematic diagram of the electrocatalytic cathode and anode electrodes loaded with catalysts.

Figure 3 is the time-dependent curve of ammonia nitrogen and nitrate content during the electrocatalytic reaction.

In Fig. 1: 1 filter; 2 regulating tank; 3 pump; 4 power supply and switch; 5 stirring paddle; 6 anode; 7 cathode; 8 anode catalyst; 9 cathode catalyst.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

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

2. Electrocatalytic nitrification and denitrification stage,

(1) The experiment adopts the anode ruthenium dioxide electrode 2cm*2cm, the cathode uses the copper-copper oxide electrode 2cm*2cm, turns on the stirrer, sets the electrolysis voltage 2v, tests the change of ammonia nitrogen and nitrate concentration with time, and does not add the cathode. The test group of denitrification electrodes was compared.

(2) Use a cobalt tetroxide electrode of 2cm*2cm for the anode and a copper-copper oxide electrode of 2cm*2cm for the cathode, turn on the stirrer, set the electrolysis voltage to 2v, and test the changes of ammonia nitrogen and nitrate concentration with time.

The test results show that the reaction current density of 500ml of wastewater with an initial ammonia nitrogen of 100mg/L reaches about 20mA. After about 7 hours, the ammonia nitrogen in the effluent is reduced to 12mg/L, the nitrate is reduced to below 20mg/L, and the latter is at 12mg/L. L or so. The degradation rate reaches 88%, that is, the effluent quality meets the discharge standard.

It should be noted that, in the drawings or the text of the description, the implementation methods that are not drawn or described are in the form known to those of ordinary skill in the technical field, and are not described in detail. In addition, the above definitions of each element are not limited to various specific structures, shapes or methods mentioned in the embodiments, and cannot be simply modified or replaced. Any modification made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (3)

1. a novel electrocatalytic ammonia nitrogen wastewater treatment device is characterized in that: the device comprises an anode, a negative electrode, and the anode has a catalyst with electrocatalytic chlorine evolution activity, and the negative electrode has a catalyst with electrocatalytic reduction and denitrification, and two electrodes are used in ammonia nitrogen wastewater. Electrocatalytic reactions. 2. a kind of novel electrocatalytic ammonia nitrogen wastewater treatment device according to claim 1, is characterized in that: anode has the catalyst of analysing chlorine catalytic activity, and anode catalyst is any one in DSA electrode, cobalt tetroxide electrode, ruthenium dioxide electrode . 3. a kind of novel electrocatalytic ammonia nitrogen wastewater treatment device according to claim 1, is characterized in that: described cathode has the catalyzer of denitrification, catalyzer is copper electrode, copper oxide electrode, iron electrode, iron oxide electrode, carbon any of the electrodes.

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