CN111732265B

CN111732265B - Nylon ATY oil agent wastewater treatment device

Info

Publication number: CN111732265B
Application number: CN202010774456.9A
Authority: CN
Inventors: 张勇; 范克高; 陈茂林; 程朝阳; 黄宇
Original assignee: Suzhou Danlin Environmental Technology Co ltd
Current assignee: Suzhou Danlin Environmental Technology Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2020-12-18
Anticipated expiration: 2040-08-04
Also published as: CN111732265A

Abstract

The invention relates to a chinlon ATY oiling agent wastewater treatment device, which comprises: a breast breaking pool; the air flotation tank I is connected with a liquid outlet of the breast breaking tank and is provided with a sludge groove; the sludge backflow component comprises a backflow pipe and a backflow pump, the backflow pipe is connected between the sludge tank and the bottom of the demulsification pool, the backflow pump is arranged in the backflow pipe, and the sludge backflow component is used for returning sludge in the sludge tank into the demulsification pool; biochemical treatment subassembly, biochemical treatment subassembly are connected in I low reaches in the air supporting pond. Due to the action of the reflux pump, the demulsification pool forms a fluidized bed form, and the thickness of an emulsion film of pollutants is weakened under the condition of higher ascending flow velocity, so that the contact probability of the demulsifier and the emulsion film is increased, and the demulsification effect is enhanced. In addition, as the sludge in the air floatation tank I flows back into the demulsification tank, unreacted demulsifier carried in the sludge can be recycled, thereby reducing the dosage of the demulsifier.

Description

Nylon ATY oil agent wastewater treatment device

Technical Field

The invention relates to a wastewater treatment device, in particular to a chinlon ATY oiling agent wastewater treatment device.

Background

During the production of ATY (ATY: air textured yarn) winding of nylon, about 0.5% of ATY oiling agent wastewater is generated, and the wastewater has certain degradability. According to the known components of the ATY oil, the wastewater contains complex components such as mineral oil, an emulsifier, a wetting penetrant, a viscosity regulator, an antioxidant and the like, the treatment difficulty is high, the standard treatment is difficult to achieve by the conventional demulsification process, and the adverse effect is caused on the development of the polyamide ATY industry. For the standard discharge treatment of the wastewater, the wastewater needs to be demulsified.

The main component of the industrial general polyamide ATY oiling agent wastewater is fatty alcohol-polyoxyethylene ether OP type surfactant, and the industrial general polyamide ATY oiling agent wastewater has the following property characteristics:

(1) the OP type emulsifier is a nonionic surfactant and is also an anionic emulsion;

(2) the HLB value of the emulsifier is 14.5, and the HLB value of the emulsifier can be reduced by water to obtain stable emulsion;

(3) the cloud point of the emulsifier is 61-67 ℃, the emulsifier is easily soluble in water, and the pH value of a 1% aqueous solution is 6-7;

(4) the ATY oil solution wastewater contains more additives, so that the emulsion stability is better.

At present, the treatment of emulsion wastewater mainly adopts methods such as a chemical coagulation method, a co-coagulation air flotation method, an electrocoagulation method, an advanced oxidation method, a membrane separation method, an ultrafiltration method, an oxidation pond method, a biochemical combined process and the like. The chemical demulsification method (the method adopted by the chemical coagulation method, the co-coagulation air flotation method and the electrocoagulation method) is widely applied due to the characteristics of simple equipment, relatively stable treatment, wide application range and the like. In the traditional chemical demulsification means, the oil agent is usually removed by a coagulation method to realize water-oil separation and achieve the purpose of demulsification, but the practical application effect of the traditional coagulant and emulsifier on the ATY oil agent wastewater treatment is not obvious, so that the environmental protection pressure of corresponding enterprises is huge, the development of the polyamide ATY industry is not facilitated, and therefore, the exploration of a novel treatment method is very urgent.

Disclosure of Invention

The invention aims to provide a chinlon ATY oiling agent wastewater treatment device, which solves the problems of difficult treatment and difficult degradation of chinlon ATY oiling agent wastewater.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a chinlon ATY oiling agent wastewater treatment device, which comprises:

a breast breaking pool;

the air flotation tank I is connected with a liquid outlet of the breast breaking tank and is provided with a sludge groove;

the sludge backflow component comprises a backflow pipe and a backflow pump, the backflow pipe is connected between the sludge tank and the bottom of the breast breaking pool, the backflow pump is arranged in the backflow pipe, and the sludge backflow component is used for enabling sludge in the sludge tank to flow back into the breast breaking pool;

and the biochemical treatment assembly is connected to the downstream of the air floatation tank I.

Optimally, a guide cylinder is arranged in the breast breaking pool, the guide cylinder is respectively provided with a medicine adding port at the upper end and an outlet at the lower end, and the lower end of the guide cylinder extends into the breast breaking pool.

Further, a stirring mechanism is arranged in the guide shell.

Optimally, the height-diameter ratio of the breast breaking pool is 3: 1 or more.

Optimally, the biochemical treatment component comprises an anoxic tank, an aerobic tank and a secondary sedimentation tank.

Optimally, the device also comprises an air floatation tank II which is connected with the downstream of the biochemical treatment component.

Optimally, at least one sludge hopper is arranged at the bottom of the air floatation tank I.

Further, the sludge hopper is connected with the sludge tank.

Optimally, an ORP meter is arranged in the breast breaking pool.

Optimally, the chemical-mechanical polishing device also comprises a chemical-adding component I, wherein a demulsifier adopted by the chemical-adding component I is a mixture of ferric salt, ammonium citrate and a reverse surfactant.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

according to the nylon ATY oiling agent wastewater treatment device, the sludge backflow component is arranged between the air floatation tank I and the demulsification tank and comprises the backflow pipe and the backflow pump, the demulsification tank is formed into a fluidized bed under the action of the backflow pump, the thickness of an emulsion film of pollutants is weakened under the action of a high rising flow rate, the contact probability of a demulsifier and the emulsion film is increased, and the demulsification effect is enhanced. In addition, as the sludge in the air floatation tank I (particularly the sludge in the sludge tank) flows back into the demulsification tank, unreacted demulsifier carried in the sludge can be recycled, thereby reducing the dosage of the demulsifier.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic perspective view of a chinlon ATY oil agent wastewater treatment device according to a preferred embodiment of the invention;

wherein the reference numerals are as follows:

1. a breast breaking pool;

2. an air flotation tank I;

3. a sludge return assembly; 31. a return pipe; 32. a reflux pump;

4. a biochemical treatment component; 41. an anoxic tank; 42. an aerobic tank; 43. a secondary sedimentation tank;

5. an air flotation tank II;

6. a sludge tank;

7. a draft tube;

8. a stirring mechanism;

9. a sludge hopper;

10. a pH meter;

11. a regulating tank;

12. a dosing assembly I;

13. a medicine adding component II;

14. and a medicine adding assembly III.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in figure 1, the device for treating the chinlon ATY oiling agent wastewater is used for treating the chinlon ATY oiling agent wastewater.

The chinlon ATY oiling agent wastewater treatment device mainly comprises a demulsifying pond 1, an air floatation pond I2, an adjusting pond 11, a biochemical treatment component 4 and an air floatation pond II 5. Is in a modular arrangement. The main innovation point of the embodiment is that a sludge backflow component 3 is arranged between a sludge tank 6 of the air floatation tank I2 and the demulsification tank 1, and a new demulsifier is used.

The wastewater is led into the breast breaking tank 1 by a pipeline. The demulsifying pool 1 is internally provided with a chemical feeding component I12 for adding a demulsifier into the demulsifying pool 1, wherein the demulsifier adopted in the embodiment is a mixed demulsifier which is a mixture of trivalent ferric salt, ammonium citrate and a reverse surfactant. In high salt of Fe³⁺By adding ammonium citrate and a reverse surfactant, under the condition of pH =6, a proper emulsion breaker system is formed for emulsion breaking so as to achieve good effect. A pH meter 10 is arranged in the breast breaking tank 1 to monitor the pH value. Such demulsifiers are an innovation over the prior art.

In this example, the demulsification pool 1 is also provided with an ORP meter (oxidation-reduction potential on-line analyzer) which can monitor the oxidation-reduction potential in the demulsification process and control Fe through the change of the oxidation-reduction potential³⁺The amount of (c) added.

A guide shell 7 is arranged in the breast breaking pool 1, the guide shell 7 is provided with a drug adding opening at the upper end and an outlet at the lower end, and the lower end of the guide shell 7 extends into the breast breaking pool 1.

The chemical adding component I12 adds the demulsifier from the upper end of the guide shell 7, and the demulsifier enters the demulsification tank 1 from the outlet at the lower end of the guide shell 7 after being guided by the guide shell 7. In the process that the demulsifier descends in the guide shell 7, the demulsifier fully reacts with the polyamide ATY oil agent wastewater (particularly the wastewater in the guide shell 7) in the demulsification pool 1, and the guide shell 7 ensures the concentration of the demulsifier due to the limitation of the space. In order to fully mix the demulsifier and the wastewater, a stirring mechanism 8 is also arranged in the guide cylinder 7.

As certain SS (suspended solid) is generated in the demulsification process, the treatment needs to be carried out by an air floatation tank I2. The air floatation tank I2 is connected with a liquid outlet of the milk breaking tank 1 to receive the liquid outlet of the milk breaking tank 1. The floatation tank I2 can adopt a floatation tank commonly used in the field. Air supporting pond I2 has sludge impoundment 6, and sludge impoundment 6 is arranged in collecting the dross of scraping off from air supporting pond I2.

Be provided with in the air supporting pond I2 and add medicine subassembly II 13, carry out coagulation flocculation to adding coagulant and flocculating agent in the air supporting pond I2 through adding medicine subassembly II 13, carry out physical separation to SS (suspended solid) after the breakdown of emulsion pond 1.

A sludge return component 3 is arranged between the sludge tank 6 and the demulsification tank 1, which is an innovative part relative to the prior art.

The sludge recirculation assembly 3 includes a recirculation pipe 31 and a recirculation pump 32. Wherein, the return pipe 31 is connected between the sludge tank 6 and the bottom of the emulsion breaking tank 1; wherein a return pump 32 is arranged in the return pipe 31. The reflux pump 32 provides power to pump the sludge in the sludge tank 6 into the breast breaking tank 1.

The sludge recirculation assembly 3 can serve at least two functions:

(1) the sludge in the sludge tank 6 contains a large amount of unreacted reagents, some colloid substances with strong adsorbability and some pollutant substances after reaction, and the substances are returned to the demulsification tank 1, so that the demulsification process is promoted, and the cost of the reagents used in the demulsification process is saved, thereby reducing the operation cost;

(2) the reflux pump 32 pumps the sludge into the bottom of the emulsion breaking tank 1 to promote the fluid in the emulsion breaking tank 1 to flow upwards, so that the emulsion breaking tank 1 is in a fluidized bed state, and the thickness of an emulsion film of pollutants is weakened at a high ascending flow velocity, so that the contact probability of the demulsifier and the emulsion film is increased, and the emulsion breaking effect is enhanced.

The demulsification pool 1 of the embodiment adopts a larger height-diameter ratio, so that the ascending flow speed of the fluid can be improved. When the power of the return pump 32 is predetermined, the smaller the horizontal diameter of the emulsion breaking tank 1, the larger the upward flow velocity is. The demulsification pool 1 of the embodiment has the height-diameter ratio of 3: 1, the ascending flow rate reaches 2-5m/h, thus having better demulsification effect. The height-diameter ratio of the breast breaking pool 1 is 3: when the flow rate is 1 or more (including 3: 1 and also including more than 3: 1), a preferable ascending flow rate can be obtained.

In the demulsification process, the problems of sludge floating and sludge sinking can occur, so that the air floatation tank I2 with the bucket is adopted, namely the sludge bucket 9 is arranged at the bottom of the air floatation tank I2. The number of the sludge hoppers 9 is not limited, and three sludge hoppers 9 are provided in this example.

Preferably, the sludge hopper 9 is connected to the sludge tank 6 so that the sludge in the sludge hopper 9 is introduced into the sludge tank 6. The height of the sludge tank 6 may be set lower than the sludge hopper 9 so that the sludge naturally flows from the sludge hopper 9 into the sludge tank 6. Namely, the sludge tank 6 receives sludge from two sources: scum scraped from the air flotation tank I2 and sludge precipitated in the sludge hopper 9. The sludge from the two sources flows back into the breast breaking tank 1 through the action of the return pump 32.

Therefore, the demulsification tank 1, the air flotation tank I2 and the sludge backflow component 3 form a linkage state. A certain amount of sludge is formed after demulsification and enters an air floatation tank I2, scum is generated in the air floatation tank I2, sludge deposited at the bottom is generated, and the sludge enters a demulsification tank 1 through a sludge backflow component 3.

From the indexes of water coming from the polyamide ATY oiling agent wastewater, the wastewater contains indexes such as COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus), petroleum and caprolactam, the COD index is 10000mg/L, but after the ATY oiling agent wastewater is demulsified at the front section, the COD of the ATY oiling agent wastewater is greatly reduced, and nondegradable grease is separated out, so that the biodegradability of the ATY oiling agent wastewater is greatly enhanced, and the subsequent treatment can be carried out by a biochemical system.

The downstream of the air flotation tank I2 is connected with an adjusting tank 11, wastewater is guided into the adjusting tank 11 to adjust the quality and quantity of the wastewater, the adjusting tank 11 adjusts the quality and quantity of the wastewater simultaneously, and a perforated aeration pipe is additionally arranged at the bottom of the tank to stir.

The biochemical treatment component 4 is connected with the downstream of the adjusting tank 11. The biochemical treatment component 4 adopts an AO process and comprises an anoxic tank 41, an aerobic tank 42 and a secondary sedimentation tank 43. The sludge load is set to be 0.2-0.5 kgCOD/MLSS.d, and reasonable sludge load can be selected according to different water outlet targets.

From the view of biochemical treatment process, an anoxic and aerobic combined process is arranged, mixed liquor circulation is arranged, the function of the anoxic tank is similar to that of the biological selection tank, ammonia nitrogen and TN in the wastewater need to be removed for the consideration of subsequent reclaimed water reuse treatment, and therefore, an AO process is arranged, and in addition, the AO process is also favorable for controlling sludge bulking.

And the other air floatation tank, namely an air floatation tank II 5, is arranged at the downstream of the biochemical treatment assembly 4, and the air floatation tank II 5 can adopt an air floatation tank commonly used in the field. And a chemical adding component III 14 is arranged in the air floatation tank II 5, and a coagulant and a flocculating agent are added through the chemical adding component III 14 to perform coagulation and flocculation.

From the aspect of treating the final effluent, if the subsequent need of reclaimed water reuse is considered, the addition of the air flotation tank II 5 is not only beneficial to the control of the final effluent target, but also beneficial to the extension of the application of the subsequent reclaimed water process.

The beneficial effects produced by the embodiment are as follows: (1) not only is the demulsification reactor innovated in form, but also the demulsifier is innovated in selection and application, and under the condition that the COD of raw water inlet water is 8000ppm, after demulsification is carried out by a demulsification fluidized bed, the COD can be degraded to be within 800 ppm; (2) the treatment effect can be stabilized; (3) the demulsification process and even the medicament used in the whole treatment process are saved, and the treatment cost is saved; (4) under the condition that the biochemical treatment load is selected to be lower, the total COD effluent can be reduced to 80ppm, TN is less than 35mg/L, and the total COD effluent can be continuously stable; (5) in addition, the medicament used in the whole process is safe, harmless, convenient and safe; (6) meanwhile, the structure is subjected to modular production, so that the transformation of nylon production enterprises without stopping water can be realized.

In conclusion, due to the application of the technology, the polyamide ATY oiling agent wastewater is well treated, the treatment is stable and efficient, the treatment is economical and practical, a good environment-friendly solution is provided for the polyamide ATY industry, and the development of the polyamide ATY industry can be promoted to a certain extent.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a polyamide fibre ATY finish effluent treatment plant for handle polyamide fibre ATY finish effluent, its characterized in that, it includes:

a breast breaking pool (1);

the device comprises an air flotation tank I (2), wherein the air flotation tank I (2) is connected with a liquid outlet of the milk breaking tank (1), and the air flotation tank I (2) is provided with a sludge groove (6);

the sludge backflow component (3) comprises a backflow pipe (31) and a backflow pump (32), the backflow pipe (31) is connected between the sludge tank (6) and the bottom of the breast breaking tank (1), the backflow pump (32) is arranged in the backflow pipe (31), and the sludge backflow component (3) is used for enabling sludge in the sludge tank (6) to flow back into the breast breaking tank (1);

the biochemical treatment component (4), the biochemical treatment component (4) is connected to the downstream of the air floatation tank I (2);

the chemical feeding component I (12) is used for adding a set demulsifier into the demulsification tank (1), and the set demulsifier is a mixture of a ferric salt, ammonium citrate and a reverse surfactant;

the milk breaking pool (1) is also internally provided with a guide cylinder (7), the guide cylinder (7) is respectively provided with a medicine adding port at the upper end and an outlet at the lower end, the lower end of the guide cylinder (7) extends into the milk breaking pool (1), and the guide cylinder (7) is internally provided with a stirring mechanism (8);

the height-diameter ratio of the breast breaking pool (1) is 3: 1 or more.

2. The chinlon ATY oiling agent wastewater treatment device of claim 1, which is characterized in that: the biochemical treatment component (4) comprises an anoxic tank (41), an aerobic tank (42) and a secondary sedimentation tank (43).

3. The chinlon ATY oiling agent wastewater treatment device of claim 1, which is characterized in that: the device also comprises an air floatation tank II (5), wherein the air floatation tank II (5) is connected to the downstream of the biochemical treatment component (4).

4. The chinlon ATY oiling agent wastewater treatment device of claim 1, which is characterized in that: at least one sludge hopper (9) is arranged at the bottom of the air floatation tank I (2).

5. The chinlon ATY oiling agent wastewater treatment device of claim 4, which is characterized in that: the sludge hopper (9) is connected with the sludge tank (6).

6. The chinlon ATY oiling agent wastewater treatment device of claim 1, which is characterized in that: an ORP meter is arranged in the breast breaking pool (1).