CN110723842A - Integrated multi-effect clarification system and clarification method - Google Patents

Abstract

The invention discloses an integrated multi-effect clarification system and a clarification method thereof, which are used for treating wastewater stored in a catchment pool; the system comprises a lift pump, a flocculation reaction pool, a flocculation dosing tank, a multi-effect clarifier and a dehydrator ; The waste water in the catchment tank is fed into the flocculation reaction tank through the waste water discharge port through the lift pump, and the axial flow mixer is turned on, and flocculant and/or coagulant are added at the same time; The precipitation water in the clarifier is discharged into the dehydrator, and the filtrate of the dehydrator is returned to the catchment tank, and the clean water filtered again by the inclined plate group at the top is discharged through the clean water outlet. The invention highly integrates various technologies beneficial to solid-liquid separation such as chemical flocculation, mechanical stirring, loading sedimentation, inclined tube separation, etc., which not only maintains the high-speed and compact effluent of the multi-effect clarification system, but also has good effluent quality and impact resistance. The advantages of strong capacity and saving operating costs increase the flexibility of operation.

Description

Integrated multi-effect clarification system and clarification method

technical field

The invention relates to the technical field of wastewater treatment, and more particularly to an integrated multi-effect clarification system and a clarification method thereof.

Background technique

Bleeding water, flushing water, dust suppression water and rainwater precipitation produced in iron ore storage and transportation overshoot are the main sources of iron ore storage and transportation wastewater. Wastewater contains a lot of suspended solids and high chromaticity. According to the actual operation experience of the project, the concentration of suspended solids in wastewater can be as high as 3000mg/l, and the chromaticity can be as high as 500 or more. This part of the wastewater cannot be directly discharged or recycled, and needs to be properly treated to meet the water quality requirements for recycling. Similarly, some other mine wastewater, mine water, coal-containing wastewater, and other similar industrial fields, the high suspended solids wastewater generated in the production process also needs to be recycled.

Wastewater is a mixture of water and fine mud materials. Its main characteristics are high turbidity, fine solid particle size, and negative charges on the surface of solid particles. The repulsion between the same charges keeps these particles dispersed in water, subject to gravity and Brownian motion. Due to the interaction between solid particle interfaces in wastewater (such as adsorption, dissolution, compounding, etc.), the properties of wastewater are quite complex, not only with the properties of suspensions, but also of colloids. Due to the above reasons, it is difficult for the wastewater to be naturally clarified, and the supernatant of this type of wastewater is still a pale yellow liquid with a large amount of suspended matter such as fine mud after sedimentation. The traditional treatment process can often only remove larger solid particles and part of the suspended solids, but cannot remove a large amount of fine-grained suspended solids and chromaticity in the wastewater. Craftsmanship is important.

Therefore, how to provide a clarification system with good wastewater treatment effect and high treatment efficiency and a method thereof is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an integrated multi-effect clarification system and a clarification method thereof, aiming at solving the above-mentioned problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

An integrated multi-effect clarification system for treating wastewater stored in a catchment tank; including: a lift pump, a flocculation reaction tank, a flocculation dosing tank, a multi-effect clarifier and a dehydrator;

One end of the lift pump is communicated with the catchment pool;

The waste water discharge port of the flocculation reaction tank is located at the bottom thereof, and communicates with the other end of the lift pump; the top of the flocculation reaction tank is installed with an axial flow mixer inserted therein;

The flocculation dosing tank is communicated with the flocculation reaction tank through a pipeline, and is used for adding flocculant and/or coagulant into the flocculation reaction tank;

The side wall of the multi-effect clarifier is attached and fixed to the side wall of the flocculation reaction tank, and the top of the attached surface has a communicating water port; the top of the multi-effect clarifier is installed with an inclined plate group, and the bottom is installed There is a scraper; the top of the side wall corresponding to the multi-effect clarifier and the flocculation reaction tank is provided with a clean water discharge port;

The feed port of the dehydrator is communicated with the bottom of the multi-effect clarifier, the water outlet is communicated with the catchment pool, and the mud outlet forms a mud cake.

Through the above technical solutions, the present invention provides improvements on the basis of the current most advanced high-efficiency loading and sedimentation tank, and highly integrates various technologies beneficial to solid-liquid separation, such as chemical flocculation, mechanical stirring, loading sedimentation, and inclined tube separation. , which not only maintains the high-speed and compact effluent of the multi-effect clarification system, and has the advantages of good effluent quality, strong impact resistance, and saving operating costs, but also increases the flexibility of operation and operation, and can achieve different media for different water quality and applications. Flexibility of dosing, or no dosing.

Preferably, in the above-mentioned integrated multi-effect clarification system, the flocculation reaction tank is a secondary reaction structure, which is composed of two side-by-side reaction tank units that are bonded together, and the two reaction pool units are bonded together. The bottom of the side wall is communicated; the axial flow agitator is installed in each of the reaction tank units. The flocculation effect on wastewater can be further improved.

Preferably, the above-mentioned integrated multi-effect clarification system further includes a base; the flocculation reaction tank, the flocculation dosing tank, the multi-effect clarifier and the dehydrator are all fixedly installed on the base superior. It is easy to be fixed and installed, and the base can be fixed on a large truck as a whole, so it can be moved and dragged, and it is convenient to use.

Preferably, in the above-mentioned integrated multi-effect clarification system, the flocculation reaction tank, the multi-effect clarification tank and the flocculation dosing tank are arranged side by side in sequence. Space saving and reasonable arrangement.

Preferably, in the above-mentioned integrated multi-effect clarification system, the flocculant is a polyacrylamide substance with a relatively large molecular weight; the coagulant is an aluminum salt or an iron salt type coagulant. Can improve the flocculation effect.

Preferably, in the above-mentioned integrated multi-effect clarification system, the inclined pipe group is composed of a plurality of pipe bodies made of PP material and having a pipe diameter of 80 mm arranged obliquely. It can effectively improve the filtration effect. On the one hand, the design of the inclined plate group improves the hydraulic upward flow rate and saves the land occupation. On the other hand, it further separates the remaining alum escaping from the pre-sedimentation area to ensure excellent clarification. The uniform water distribution of the whole inclined plate group is very important, which can avoid short circuit of water flow, so that the sedimentation can be completed in the best condition.

Preferably, in the above-mentioned integrated multi-effect clarification system, the mud scraper is a suspended central drive mud scraper. Can improve the scraping effect.

Preferably, in the above-mentioned integrated multi-effect clarification system, the multi-effect clarification tank is provided with a hydrocyclone that penetrates up and down. The hydrocyclone can ensure the recovery efficiency of the medium, so that most of the medium can be effectively recovered.

A clarification method for an integrated multi-effect clarification system, comprising the following steps:

S1. The waste water in the catchment tank is input into the flocculation reaction tank through the waste water discharge port through the lift pump, and the axial flow mixer is turned on, and flocculant and/or coagulant are added at the same time;

S2. Turn on the hydrocyclone and the scraper, so that the precipitation water entering the multi-effect clarifier is discharged into the dehydrator, and the filtrate through the dehydrator is returned to the catchment tank, and the clean water filtered again by the inclined plate group at the top passes through the clean water outlet. discharge.

Preferably, in the above-mentioned one integrated multi-effect clarification method, in S1, fine sand and/or magnetic powder type heavy medium carrier is added. The addition of fine sand, magnetic powder and other heavy medium carriers makes the flocs produced after the coagulation and flocculation reaction more compact and the specific gravity increases, thereby accelerating the settling speed of the flocs, increasing the ascending flow rate, ensuring the quality of the effluent and reducing the floor space. Since the wastewater itself contains small particles such as ore sand and slime, it has the characteristics of a carrier, and the flocs can also settle quickly without adding a carrier. Therefore, carriers such as fine sand and magnetic powder may not be added in the conventional treatment process of the wastewater, and are only used in emergencies (the concentration of raw water is low or the amount of treated water suddenly increases greatly).

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides an integrated multi-effect clarification system and a clarification method thereof, which integrates the characteristics of various precipitation technologies, and is mainly reflected in high precipitation efficiency and effluent quality. Excellent stability, small footprint, strong impact resistance, flexible and reliable operation, saving operation consumption, etc.:

1. High precipitation efficiency: The multi-effect clarifier creates good conditions for the formation of alum flowers that can precipitate quickly. At the same time, supplemented by the characteristics of external media, inclined pipe separation and perfect hydraulic design, the upward flow rate of the system is maximized.

2. Excellent effluent stability: good coagulation and flocculation conditions strengthen the capture and aggregation of pollutants; the removal of remaining flocculent by inclined tubes can produce high-quality effluent. Its excellent suspended solids removal capability is comparable to conventional filtration.

3. Small footprint: ultra-high rising flow rate, extremely short reaction time requirements, and compact structure design make multi-effect clarification one of the most compact precipitation systems at present. Its area is more than 50% less than that of the currently commonly used high-efficiency sedimentation tank.

4. Strong impact resistance: The extremely high sludge concentration (about 4-8g/L) of the flocculation reaction tank is controlled by the sludge return, which is the normal working condition of the multi-effect clarifier. Compared with the sludge concentration in the raw water, The concentration of circulating sludge is much higher, and the change of raw water concentration will not affect the working conditions, so it will not destroy the formation of alum, and it will not affect the normal operation of the system.

5. Saving running chemicals: The perfect stirring reaction design improves the reaction efficiency of the chemicals, and the sludge return setting can further recycle the chemicals that are not completely reacted, so that the chemicals required for the system to achieve the same reaction efficiency are greatly reduced. The consumption of chemicals can be saved, resulting in significant savings in operating costs.

6. The system head loss is small: the compact structure design and reasonable hydraulic design reduce the head loss of the integrated multi-effect clarification system.

7. Advantages of integrated system: industrialized production, stable and reliable quality: the integrated integrated system is manufactured in the factory through specialization of design, industrialization of production, assembly process, and quality standardization system, and the quality is stable and reliable. Modular design is beneficial for later expansion: the integrated integrated system adopts standardized modular design, the equipment occupies a small area, and there is less civil construction, which is conducive to the later expansion of the project. Less civil construction and shorter construction period: the integrated integrated system complete set of equipment is processed in the factory, the civil construction only has the equipment foundation, and the equipment installation only requires simple pipe and cable connections, which greatly shortens the construction period and indirectly saves investment costs. Vehicle-mounted design, convenient for mobile operation: The vehicle-mounted integrated multi-effect clarification system does not require civil construction, is easy to move, can be delivered quickly, and can start working immediately.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying 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 It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

Fig. 1 accompanying drawing is a schematic diagram of a process structure provided by the present invention;

Figure 2 is a schematic diagram of the structure provided by the present invention.

in:

1- sink pool;

2- lift pump;

3- flocculation reaction tank;

31- Wastewater discharge inlet;

4- flocculation dosing tank;

5-Multi-effect clarifier;

51 - water inlet;

52-Clear water discharge port;

6- Dehydrator;

7- Axial flow mixer;

8- Inclined plate group;

9- mud scraper;

10 - base;

11- Hydrocyclone.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1:

Referring to Figure 1 and Figure 2, the embodiment of the present invention discloses an integrated multi-effect clarification system for treating wastewater stored in a catchment tank 1; including: a lift pump 2, a flocculation reaction tank 3, a flocculation reactor Medicine tank 4, multi-effect clarifier 5 and dehydrator 6;

One end of the lift pump 2 is communicated with the catchment pool 1;

The waste water discharge port of the flocculation reaction tank 3 is located at its bottom, and is communicated with the other end of the lift pump 2; the top of the flocculation reaction tank 3 is provided with an axial flow mixer 7 inserted into its interior;

The flocculation dosing tank 4 is communicated with the flocculation reaction tank 3 through a pipeline, and is used for adding flocculant and/or coagulant to the flocculation reaction tank 3;

The side wall of the multi-effect clarifier 5 is fixed with the side wall of the flocculation reaction tank 3, and the top of the bonding surface has a connected water port 51; the top of the multi-effect clarifier 5 is installed with an inclined plate group 8, and the bottom The mud scraper 9; the top of the side wall corresponding to the multi-effect clarifier 5 and the flocculation reaction tank 3 is provided with a clean water discharge port 52;

The feed inlet of the dehydrator 6 is communicated with the bottom of the multi-effect clarifier 5, the water outlet is communicated with the catchment pool 1, and the mud outlet forms a mud cake.

In order to further optimize the above technical solution, the flocculation reaction tank 3 is a secondary reaction structure, which is composed of two reaction tank units arranged in parallel, and the bottom of the side wall of the two reaction tank units is connected; An axial flow mixer 7 is installed.

In order to further optimize the above technical solution, a base 10 is also included;

In order to further optimize the above technical scheme, the flocculation reaction tank 3, the multi-effect clarifying tank 5 and the flocculation dosing tank 4 are arranged in parallel in sequence.

In order to further optimize the above technical scheme, the flocculant is a polyacrylamide type substance with a relatively large molecular weight; the coagulant is an aluminum salt or iron salt type coagulant.

In order to further optimize the above technical solution, the inclined pipe group 8 is composed of a plurality of pipes made of PP material and having a pipe diameter of 80 mm arranged obliquely.

In order to further optimize the above technical solution, the mud scraper 9 is a suspended central transmission mud scraper.

In order to further optimize the above technical solution, the multi-effect clarifier 5 is installed with a hydrocyclone 11 that penetrates up and down.

Example 2:

Referring to accompanying drawings 1 and 2, the present embodiment discloses an integrated multi-effect clarification method, comprising the following steps:

S1, the waste water in the catchment tank 1 is input into the flocculation reaction tank 3 through the waste water discharge port 31 by the lift pump 2, and the axial flow mixer 7 is turned on, and flocculant and/or coagulant are added simultaneously;

S2. Turn on the hydrocyclone 11 and the scraper 9, so that the precipitation water entering the multi-effect clarifier 5 is discharged into the dehydrator 6, and the filtrate through the dehydrator 6 is returned to the catchment tank 1, and the top passes through the inclined plate group 8 The filtered clean water is discharged through the clean water discharge port 52 .

In order to further optimize the above technical solution, in S1, fine sand and/or magnetic powder heavy medium carrier is added.

The specific principle of this embodiment is:

Using the existing catchment pool 1, add two lift pumps 2 to collect the wastewater and lift it to an integrated multi-effect clarification system through a submersible sewage pump.

After the wastewater is sent to the integrated multi-effect clarification system by the lift pump 2, it first enters the flocculation reaction tank 3, and the suspended solids in the incoming wastewater to be treated are promoted by the flocculant/coagulant through adsorption, electrical neutralization and mutual interaction. The bridging effect forms larger flocs, and under the action of the slow-speed axial flow mixer 7, the agent and the flocs can be fully mixed without destroying the formed large flocs.

The sewage that forms flocs through the flocculation reaction enters the multi-effect clarifier 5 at a low speed to ensure that the flocs are not damaged. Then enter the sedimentation zone, where the coagulation flocs settle to the bottom of the pool. The upper part of the sedimentation area is equipped with a sloping plate group, which is mainly used for diversion, avoiding the lateral flow of the water flow, and reducing the influence of the lateral flow on the sedimentation effect (the lateral flow has a great influence on the sedimentation effect). , the fine flocs are further removed on the inclined tube. The clarified supernatant reaches the standard and is discharged into the water pipe.

The bottom of the multi-effect clarifier 5 is the sludge area, and the sludge scraper 9 is set up to scrape the sludge to the central mud hopper and discharge it into the dehydrator 6, and the filtrate through the dehydrator 6 is returned to the catchment tank 1, and the top passes through the inclined plate group. 8 The filtered clean water is discharged through the clean water discharge port 52 .

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to 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 (10)

1. An integrated multi-effect clarification system for treating the waste water stored in the catchment pool (1); it is characterized in that, comprising: a lift pump (2), a flocculation reaction tank (3), a flocculation dosing tank ( 4), multi-effect clarifier (5) and dehydrator (6); One end of the lift pump (2) is communicated with the catchment pool (1); The waste water discharge port of the flocculation reaction tank (3) is located at its bottom and communicates with the other end of the lift pump (2); the top of the flocculation reaction tank (3) is provided with an axial flow mixer ( 7); The flocculation dosing tank (4) is communicated with the flocculation reaction tank (3) through a pipeline, and is used for adding a flocculant and/or a coagulant to the flocculation reaction tank (3); The side wall of the multi-effect clarifier (5) is attached and fixed to the side wall of the flocculation reaction tank (3), and the top of the attached surface has a communicating port (51); the multi-effect clarifier ( 5) A sloping plate group (8) is installed at the top, and a mud scraper (9) is installed at the bottom; the top of the side wall corresponding to the multi-effect clarifier (5) and the flocculation reaction tank (3) is provided with a clean water drain. export(52); The feed port of the dehydrator (6) is communicated with the bottom of the multi-effect clarifier (5), the water outlet is communicated with the catchment pool (1), and the mud outlet forms a mud cake. 2. An integrated multi-effect clarification system according to claim 1, characterized in that, the flocculation reaction tank (3) is a secondary reaction structure, and is composed of two side-by-side reaction tank units fitted together, and The two reaction pool units are connected at the bottom of the side walls that are attached; each of the reaction pool units is provided with the axial flow mixer (7). 3. An integrated multi-effect clarification system according to claim 1, characterized in that, further comprising a base (10); the flocculation reaction tank (3), the flocculation dosing tank (4), the flocculation dosing tank (4), the Both the multi-effect clarifier (5) and the dehydrator (6) are fixedly installed on the base (10). 4. An integrated multi-effect clarification system according to claim 3, characterized in that the flocculation reaction tank (3), the multi-effect clarification tank (5) and the flocculation dosing tank (4) Arranged side by side. 5. The integrated multi-effect clarification system according to claim 1, wherein the flocculant is a polyacrylamide substance with a relatively large molecular weight; the coagulant is a mixture of aluminum salts or iron salts. coagulant. 6 . The integrated multi-effect clarification system according to claim 1 , wherein the inclined pipe group ( 8 ) is composed of a plurality of pipe bodies made of PP material and having a pipe diameter of 80 mm arranged in an inclined manner. 7 . 7 . The integrated multi-effect clarification system according to claim 1 , wherein the mud scraper ( 9 ) is a suspended central transmission mud scraper. 8 . 8 . The integrated multi-effect clarification system according to claim 1 , wherein a hydrocyclone ( 11 ) that penetrates up and down is installed in the multi-effect clarification tank ( 5 ). 9 . 9. a clarification method utilizing the integrated multi-effect clarification system described in any one of claims 1-9, is characterized in that, comprises the following steps: S1. The waste water in the catchment pool (1) is input into the flocculation reaction pool (3) through the waste water discharge port (31) by the lift pump (2), and the axial flow mixer (7) is turned on, and the flocculant and/or mixing agent are added at the same time. coagulant; S2. Turn on the hydrocyclone (11) and the scraper (9), so that the precipitation water entering the multi-effect clarifier (5) is discharged into the dehydrator (6), and the filtrate through the dehydrator (6) is returned to the In the catchment pool (1), the clean water filtered again by the inclined plate group (8) at the top is discharged through the clean water discharge port (52). 10. An integrated multi-effect clarification method according to claim 9, characterized in that, in S1, fine sand and/or magnetic powder heavy medium carrier is added.

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