CN115259491A - High-concentration stalk liquid wastewater pretreatment system and wastewater treatment system - Google Patents

Abstract

The invention relates to a high-concentration stem liquid wastewater pretreatment system and a wastewater treatment system, wherein the high-concentration stem liquid wastewater pretreatment system comprises a catalytic oxidation system and an electric flocculation system, the catalytic oxidation system is used for carrying out electrocatalytic oxidation and chemical catalytic oxidation on wastewater, the catalytic oxidation system comprises a catalytic oxidation water tank and an electrocatalytic oxidation device, the electrocatalytic oxidation device is used for carrying out electrocatalytic oxidation treatment on the wastewater in the catalytic oxidation water tank, the electric flocculation system comprises a flocculation precipitation water tank and an electric flocculation device, the electric flocculation device is used for carrying out electric flocculation treatment on the wastewater in the flocculation precipitation water tank, the catalytic oxidation water tank is connected with the flocculation precipitation water tank through a delivery pump, and the delivery pump is used for delivering the catalytic oxidation water tank to the flocculation precipitation water tank; the high-concentration stalk liquid wastewater pretreatment system can reduce the subsequent sewage treatment load, improve the sewage treatment efficiency, reduce the consumption of the flocculating agent, save the electric energy and reduce the operation cost.

Description

A high-concentration stem liquid wastewater pretreatment system and wastewater treatment system

technical field

The invention relates to the technical field of wastewater treatment, in particular to a high-concentration stalk liquid wastewater pretreatment system and a wastewater treatment system.

Background technique

At present, due to the lack of corresponding pretreatment technology, most reconstituted tobacco leaf enterprises treat high-concentration wastewater such as stalk liquid and enter the sewage treatment system together with other production wastewater for biochemical and physicochemical treatment. However, nicotine, as a nitrogen-containing biheterocyclic compound, Due to the "lack of π electrons" structure, the charge density of the ring structure decreases, and the three-dimensional structure of the five-membered heterocyclic ring and the benzene heterocyclic ring makes nicotine have a steric volume hindrance effect. These reasons make it difficult for oxygen to obtain electrons from nicotine molecules. Therefore, the degradation performance of biochemical treatment on nicotine is not good, and the chroma of biochemical effluent from reconstituted tobacco leaf wastewater treatment is still very high. Usually, Fenton advanced oxidation advanced treatment is required to meet the standard, which greatly increases the construction and operation costs of sewage treatment. In addition, during the biochemical treatment, a part of undegraded nicotine enters the sludge through precipitation, and finally enters the soil, posing a potential threat to indigenous microorganisms in the environment. Moreover, the wastewater contains a large amount of refractory organic matter, and the effect of physical and chemical treatment is negligible.

Tobacco companies currently produce 80-100 tons of waste stalk liquid per day, accounting for about 5%-10% of the total sewage volume. Although the amount of waste water such as high-concentration stalk liquid is small, the COD concentration and chroma are very high (COD can reach 100,000 mg/L or more), and contains a large amount of nicotine, if it is directly discharged into the sewage treatment station, the processing load of the biochemical section will be significantly increased, and the corresponding dosage of flocculation and other chemicals will also be greatly increased. .

Contents of the invention

The first object of the present invention is to provide a high-concentration stalk liquid wastewater pretreatment system to reduce the subsequent sewage treatment load, improve sewage treatment efficiency, reduce flocculant dosage, save electric energy, and reduce operating costs.

The second object of the present invention is to provide a wastewater treatment system comprising the above-mentioned high-concentration stalk liquor wastewater pretreatment system.

To achieve the above object, the present invention provides the following technical solutions:

A high-concentration stalk liquid wastewater pretreatment system, comprising:

A catalytic oxidation system, the catalytic oxidation system is used for electrocatalytic oxidation and chemical catalytic oxidation of wastewater, the catalytic oxidation system includes a catalytic oxidation water tank and an electrocatalytic oxidation device, and the electrocatalytic oxidation device is used for the catalytic oxidation The wastewater in the tank is electrocatalytically oxidized;

An electrocoagulation system, the electrocoagulation system includes a flocculation sedimentation tank and an electroflocculation device, the electrocoagulation device is used for electrocoagulation treatment of wastewater in the flocculation sedimentation tank, the catalytic oxidation water tank and the flocculation sedimentation tank It is connected by a delivery pump, and the delivery pump is used to send the catalytic oxidation water tank to the flocculation sedimentation water tank.

Optionally, the electrocatalytic oxidation device includes a first power supply, a first anode and a first cathode, the first anode and the first cathode are arranged in the catalytic oxidation water tank, the first anode and the first cathode are The positive pole of the first power supply is electrically connected, and the first cathode is electrically connected to the negative pole of the first power supply.

Optionally, the first anode is a Ti/PbO ₂ anode, and the first cathode is a Ti cathode.

Optionally, the first anode and the first cathode are sequentially arranged at intervals along the wastewater flow direction in the catalytic oxidation water tank.

Optionally, the electrocoagulation device includes a second power supply, a second anode and a second cathode, the second anode and the second cathode are arranged in the flocculation sedimentation tank, the second anode and the second The positive pole of the power supply is electrically connected, and the second cathode is electrically connected to the negative pole of the second power supply.

Optionally, the second anode is an iron anode, and the second cathode is a copper cathode.

Optionally, the electrocoagulation device includes two second cathodes, the two second cathodes are respectively electrically connected to the negative electrodes in the second power supply, and the two second cathodes are respectively arranged on the on both sides of the second anode.

Optionally, the two second cathodes are respectively arranged upstream and downstream of the second anode along the flow direction of the wastewater in the flocculation and sedimentation tank.

Optionally, a sedimentation zone is provided at the bottom of the flocculation and sedimentation tank.

Optionally, the catalytic oxidation water tank is connected with a water inlet tank, and the flocculation sedimentation water tank is connected with a water outlet tank.

A wastewater treatment system comprising:

Production wastewater collection and mixing systems;

The high-concentration stalk liquid wastewater pretreatment system as described in any one of the above, the liquid inlet end of the high-concentration stalk liquid wastewater pretreatment system is connected with the liquid output end of the production wastewater collection and mixing system;

Domestic sewage collection and mixing system, the liquid inlet end of the domestic sewage collection and mixing system is respectively connected with the domestic sewage discharge end and the liquid outlet end of the high-concentration liquid wastewater pretreatment system;

A biological treatment system, the liquid inlet of the biological treatment system communicates with the liquid outlet of the domestic sewage collection and mixing system;

A water collection tank, the water collection tank is in communication with the liquid outlet of the biological treatment system and the liquid outlet of the high-concentration stalk liquid wastewater pretreatment system respectively.

It can be seen from the above technical solutions that the present invention discloses a high-concentration stalk liquid wastewater pretreatment system, the high-concentration stalk liquid wastewater pretreatment system includes a catalytic oxidation system and an electroflocculation system, wherein the catalytic oxidation system is used for treating The wastewater is subjected to electrocatalytic oxidation and chemical catalytic oxidation. The catalytic oxidation system includes a catalytic oxidation tank and an electrocatalytic oxidation device. The electrocatalytic oxidation device is used for electrocatalytic oxidation treatment of wastewater in the catalytic oxidation tank. The electroflocculation system includes a flocculation sedimentation tank and Electrocoagulation device, the electrocoagulation device is used to electrocoagulate the wastewater in the flocculation sedimentation tank, the catalytic oxidation water tank is connected to the flocculation sedimentation tank through a delivery pump, and the delivery pump is used to send the catalytic oxidation water tank to the flocculation sedimentation tank; , the wastewater first enters the electrocatalytic oxidation device for electrolysis, and electrolyzes its refractory nicotine substances, so that the refractory macromolecular organic substances such as nicotine in the sewage are opened and broken to form small molecular organic substances that are easy to degrade. It is expected that the COD degradation efficiency can reach 40%; carry out chemical catalytic oxidation treatment on the wastewater after electrocatalytic oxidation, degrade its small molecule pollutants, make it undergo chemical catalytic oxidation, and improve the biodegradability of sewage under the premise of reducing the COD concentration; finally, electrocoagulate the wastewater treatment, continue to reduce COD, and at the same time degrade its chromaticity and the concentration of pollutants such as ss in the wastewater. The pretreatment system treats the high-concentration stalk liquid with a small amount of sewage water, which is convenient for removing pollutants from the source through physical and chemical means, thereby reducing the subsequent sewage treatment load, improving sewage treatment efficiency, reducing the amount of flocculant, saving electric energy, reducing Operating costs, and the reduction of treatment loads such as sewage COD concentration and the improvement of biochemical properties help to reduce the hydraulic retention time (HRT) of subsequent biochemical treatment processes, and reduce the effective volume of structures such as biochemical tanks and sedimentation tanks, which is helpful for reconstruction Tobacco leaf sewage treatment station reduces floor area and construction cost.

The invention also discloses a wastewater treatment system, which includes the above-mentioned high-concentration stalk liquid wastewater pretreatment system, since the wastewater treatment system adopts the above-mentioned high-concentration stalk liquid wastewater pretreatment system, the wastewater treatment system should have the same The same beneficial effect of the high-concentration stalk liquid wastewater pretreatment system will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the high-concentration stalk liquid wastewater pretreatment system provided by the embodiment of the present invention;

Fig. 2 is a technical roadmap of the wastewater treatment system provided by the embodiment of the present invention.

in:

1 is the first power supply; 2 is the catalytic oxidation tank; 3 is the first anode; 4 is the first cathode; 5 is the second power supply; 6 is the flocculation sedimentation tank; 7 is the second cathode; 8 is the second anode; 9 is Sedimentation area; 10 is a delivery pump; 11 is a water inlet tank; 12 is a water outlet tank.

Detailed ways

One of the cores of the present invention is to provide a high-concentration stalk liquid wastewater pretreatment system. The structural design of the high-concentration stalk liquid wastewater pretreatment system can reduce the load of subsequent sewage treatment, improve sewage treatment efficiency, reduce the amount of flocculant, Save electricity and reduce operating costs.

Another core of the present invention is to provide a wastewater treatment system comprising the above-mentioned high-concentration stalk liquor wastewater pretreatment system.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , which is a schematic structural diagram of a high-concentration stalk liquid wastewater pretreatment system provided by an embodiment of the present invention.

The embodiment of the present invention discloses a high-concentration stalk liquid wastewater pretreatment system, the high-concentration stalk liquid wastewater pretreatment system includes a catalytic oxidation system and an electrocoagulation system.

Among them, the catalytic oxidation system is used for electrocatalytic oxidation and chemical catalytic oxidation of wastewater. The catalytic oxidation system includes a catalytic oxidation tank 2 and an electrocatalytic oxidation device. The electrocatalytic oxidation device is used for electrocatalytic oxidation of wastewater in the catalytic oxidation tank 2. Treatment, the electrocoagulation system includes a flocculation sedimentation tank 6 and an electrocoagulation device, the electrocoagulation device is used for electrocoagulation treatment of the wastewater in the flocculation sedimentation tank 6, the catalytic oxidation water tank 2 is connected with the flocculation sedimentation tank 6 through a delivery pump 10, and the delivery pump 10 is used for sending catalytic oxidation water tank 2 to flocculation sedimentation water tank 6.

When in application, the wastewater first enters the electrocatalytic oxidation device for electrolysis, and electrolyzes its refractory nicotine substances, so that the refractory macromolecular organic substances such as nicotine in the sewage are opened and broken to form small molecular organic substances that are easy to degrade. It is expected that COD will degrade The efficiency can reach 40%; chemical catalytic oxidation treatment is carried out on the wastewater after electrocatalytic oxidation. The chemical catalytic oxidation treatment uses hydrogen peroxide and ferrous sulfate solution to degrade its small molecular pollutants and make them undergo chemical catalytic oxidation, which can reduce COD The biodegradability of sewage is improved under the premise of increasing the concentration; finally, electrocoagulation treatment is carried out on the wastewater to continue to reduce COD, and at the same time degrade its chromaticity and the concentration of ss and other pollutants in the wastewater. It is estimated that the total COD removal rate will reach 64%, reaching the total removal rate rate of not less than 60% of the design requirements.

It can be seen that compared with the prior art, the high-concentration stalk liquid wastewater pretreatment system provided by the embodiment of the present invention is used to treat the high-concentration stalk liquid with a small amount of sewage water, which is convenient for the treatment of pollutants from the source by physical and chemical means. Removal, thereby reducing the subsequent sewage treatment load, improving sewage treatment efficiency, reducing the amount of flocculant, saving electricity, reducing operating costs, and the reduction of sewage COD concentration and other treatment loads and the improvement of biochemical properties will help reduce the follow-up biochemical treatment process. The hydraulic retention time (HRT) reduces the effective volume of structures such as biochemical tanks and sedimentation tanks, which helps to reduce the footprint and construction cost of the reconstituted tobacco leaf sewage treatment station.

The high-concentration stalk liquid wastewater pretreatment technology has the advantages of convenient operation, fast reaction rate, high degree of automation, small footprint, high treatment efficiency, less sludge volume, no need for too many chemicals, and simple post-treatment. Promotion will greatly promote the realization of green development goals such as energy saving, emission reduction and efficiency enhancement in my country's reconstituted tobacco industry. At the same time, the electrochemical catalytic oxidation process can also be used as an advanced treatment process for the tertiary treatment of biochemical treatment of effluent. Compared with the traditional advanced oxidation process, the electrochemical catalytic oxidation process only needs electric energy and consumes a small amount of micro-electrolytic reactants. Requires large amounts of chemicals and lower overall operating costs.

As preferably, as shown in Figure 1, the electrocatalytic oxidation device includes a first power supply 1, a first anode 3 and a first cathode 4, the first anode 3 and the first cathode 4 are arranged in the catalytic oxidation water tank 2, and the first anode 3 is electrically connected to the positive pole of the first power supply 1, and the first cathode 4 is electrically connected to the negative pole of the first power supply 1.

Specifically, the above-mentioned first anode 3 is a Ti/PbO ₂ anode, and the first cathode 4 is a Ti cathode. This combination makes the electrodes have a longer service life.

Since the anode provides electrolytic oxidation during the electrocatalytic oxidation process, in the embodiment of the present invention, the first anode 3 and the first cathode 4 are arranged at intervals along the wastewater flow direction in the catalytic oxidation tank 2 .

As preferably, as shown in Figure 1, the electrocoagulation device comprises a second power supply 5, a second anode 8 and a second cathode 7, the second anode 8 and the second cathode 7 are arranged in the flocculation sedimentation tank 6, the second anode 8 It is electrically connected to the positive pole of the second power supply 5 , and the second cathode 7 is electrically connected to the negative pole of the second power supply 5 .

Specifically, the second anode 8 is an iron anode, and the second cathode 7 is a copper cathode. Experiments show that the electrocoagulation effect of this electrode combination is the best.

As shown in Figure 1, in the embodiment of the present invention, the electroflocculation device includes two second cathodes 7, and the two second cathodes 7 are respectively electrically connected to the negative electrodes in the second power supply 5, and the two second cathodes 7 are respectively It is arranged on both sides of the second anode 8 .

To further optimize the above technical solution, as shown in FIG. 1 , two second cathodes 7 are respectively arranged upstream and downstream of the second anode 8 along the direction of wastewater flow in the flocculation and sedimentation tank 6 .

Preferably, the bottom of the flocculation and sedimentation tank 6 is provided with a sedimentation area 9, so that the flocs after electrocoagulation are deposited in one area, which is convenient for cleaning and cleaning. As shown in Figure 1, the cross section of the sedimentation area 9 is an inverted trapezoid. Allows sediment to pool in a small area on the bottom for easy cleaning.

As shown in Figure 1, the catalytic oxidation water tank 2 is connected with a water inlet tank 11, the catalytic oxidation water tank 2 takes water from the water inlet tank 11, the flocculation sedimentation tank 6 is connected with a water outlet tank 12, and the wastewater treated by electrocoagulation enters the water outlet tank 12.

The embodiment of the present invention also provides a wastewater treatment system, which includes a production wastewater collection and mixing system, a high-concentration stalk liquid wastewater pretreatment system as described in the above embodiments, a domestic sewage collection and mixing system, and a biological treatment system. The system and the sump, wherein, the liquid inlet end of the high-concentration stalk liquid wastewater pretreatment system is connected with the liquid outlet end of the production wastewater collection and mixing system, and the liquid inlet end of the domestic sewage collection and mixing system is respectively connected with the domestic sewage discharge end and high The outlet of the concentrated stalk liquid wastewater pretreatment system is connected, the liquid inlet of the biological treatment system is connected with the liquid outlet of the domestic sewage collection and mixing system, and the sump is connected with the liquid outlet of the biological treatment system and the high concentration stalk liquid wastewater The liquid outlet of the pretreatment system is connected. Since the high-concentration stalk liquid wastewater pretreatment system in the above embodiment is used, please refer to the above embodiment for the technical effect of the wastewater treatment system.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. The utility model provides a high concentration stalk liquid wastewater pretreatment systems which characterized in that includes:

the system comprises a catalytic oxidation system, a waste water treatment system and a waste water treatment system, wherein the catalytic oxidation system is used for carrying out electrocatalytic oxidation and chemical catalytic oxidation on the waste water, and comprises a catalytic oxidation water tank and an electrocatalytic oxidation device, and the electrocatalytic oxidation device is used for carrying out electrocatalytic oxidation treatment on the waste water in the catalytic oxidation water tank;

the electric flocculation system comprises a flocculation precipitation water tank and an electric flocculation device, wherein the electric flocculation device is used for performing electric flocculation treatment on wastewater in the flocculation precipitation water tank, the catalytic oxidation water tank is connected with the flocculation precipitation water tank through a delivery pump, and the delivery pump is used for conveying the catalytic oxidation water tank to the flocculation precipitation water tank.

2. The high gravity stalk liquid wastewater pretreatment system of claim 1, wherein the electrocatalytic oxidation device comprises a first power source, a first anode and a first cathode, wherein the first anode and the first cathode are disposed in the catalytic oxidation water tank, the first anode is electrically connected to a positive electrode of the first power source, and the first cathode is electrically connected to a negative electrode of the first power source.

3. The high gravity stem liquid wastewater pretreatment system of claim 2, wherein the first anode is Ti/PbO ₂ And the first cathode is a Ti cathode.

4. The high gravity stalk liquid wastewater pretreatment system of claim 2 or 3, wherein the first anode and the first cathode are sequentially spaced apart in a wastewater flow direction within the catalytic oxidation water tank.

5. The high-concentration stalk liquid wastewater pretreatment system according to any one of claims 1-3, wherein the electroflocculation apparatus comprises a second power source, a second anode and a second cathode, the second anode and the second cathode are disposed in the flocculation precipitation tank, the second anode is electrically connected with a positive electrode of the second power source, and the second cathode is electrically connected with a negative electrode of the second power source.

6. The high gravity stalk liquid wastewater pretreatment system of claim 5, wherein said second anode is an iron anode and said second cathode is a copper cathode.

7. The high gravity stalk liquid wastewater pretreatment system of claim 5, wherein the electric flocculation device comprises two of the second cathodes, the two of the second cathodes are electrically connected to a negative electrode in the second power source, and the two of the second cathodes are disposed on two sides of the second anode.

8. The high gravity stalk liquid wastewater pretreatment system of claim 7, wherein two of said second cathodes are disposed upstream and downstream of said second anode, respectively, in a wastewater flow direction within said flocculation precipitation tank.

9. The pretreatment system for wastewater containing high concentration stalk liquid as claimed in any one of claims 1 to 3, 5 and 6, wherein the bottom of the flocculation precipitation tank is provided with a precipitation zone.

10. The pretreatment system of wastewater with high concentration stalk liquid as claimed in any one of claims 1-3, 5 and 6, wherein the catalytic oxidation water tank is connected with a water inlet tank, and the flocculation precipitation water tank is connected with a water outlet tank.

11. A wastewater treatment system, comprising:

a production wastewater collection and mixing system;

the high gravity stem waste water pretreatment system of any one of claims 1-10, wherein a liquid inlet end of the high gravity stem waste water pretreatment system is in communication with a liquid outlet end of the production waste water collection and mixing system;

the liquid inlet end of the domestic sewage collecting and mixing system is respectively communicated with the domestic sewage discharging end and the liquid outlet end of the high-concentration stem liquid wastewater pretreatment system;

the liquid inlet end of the biological treatment system is communicated with the liquid outlet end of the domestic sewage collecting and mixing system;

and the water collecting tank is respectively communicated with the liquid outlet end of the biological treatment system and the liquid outlet end of the high-concentration stem liquid wastewater pretreatment system.

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