CN114409048A

CN114409048A - Struvite crystallization device

Info

Publication number: CN114409048A
Application number: CN202210024559.2A
Authority: CN
Inventors: 蒋小妹; 孙亚平
Original assignee: Giant Star Agriculture And Animal Husbandry Co ltd
Current assignee: Giant Star Agriculture And Animal Husbandry Co ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-04-29

Abstract

The invention provides a struvite crystallization device, which aims to solve the problems that struvite is difficult to collect and easy to accumulate and harden in the sedimentation process in the prior art and provides the struvite crystallization device. The method comprises the following steps: the device comprises a crystallizing tank, wherein the bottom of the crystallizing tank is provided with a slag outlet, the side wall of the bottom of the crystallizing tank is provided with a sewage inlet, an additive inlet and a circulating water inlet, and the side wall of the top of the crystallizing tank is provided with a circulating water outlet and an overflow port; the stirring device is arranged at the top of the crystallization tank; one end of the circulating mechanism is communicated with the circulating outlet, and the other end of the circulating mechanism is communicated with the circulating water inlet; the auxiliary material adding mechanism is communicated with the additive inlet; and the external mixing mechanism is communicated with the sewage inlet. According to the invention, the mixed liquid in the crystallizing tank is stirred, so that struvite is prevented from accumulating at the bottom of the crystallizing tank to form hardening.

Description

Struvite crystallization device

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a struvite crystallization device.

Background

The discharge amount of the wastewater of the concentrated pig farm is large, the pollution load of the components is large, wherein phosphorus is up to 100-200 mg/L, ammonia nitrogen is up to 1000-5000 mg/L, the daily average discharge concentration of the ammonia nitrogen is 25mg/L and the total phosphorus is 3.0mg/L according to the discharge standard of water pollutants in Minjiang and Tuojiang drainage areas in Sichuan province, and the treatment of the wastewater of the pig farm is undoubtedly a huge challenge. As a novel method, a struvite crystallization precipitation method is favored by more and more researchers in the field of high ammonia nitrogen and phosphorus wastewater treatment. The struvite precipitation method is applied to the treatment of the concentrated piggery wastewater, so that nitrogen and phosphorus in the piggery wastewater can be efficiently removed, and meanwhile, the nutrient elements of nitrogen and phosphorus can be effectively recovered, thereby being beneficial to the treatment of the piggery wastewater and the sustainable development of nitrogen and phosphorus resources.

However, the struvite precipitation method is mainly applied to the wastewater treatment of pig farms, and mainly faces the problem that struvite precipitates are difficult to collect, and the precipitates are easy to accumulate at the bottom of the reactor and harden, so that the bottom of the reactor is difficult to clean, the labor cost is increased, and the treatment efficiency is reduced.

Disclosure of Invention

The invention provides a struvite crystallization device, aiming at solving the problems that struvite is difficult to collect and easy to accumulate and harden in the sedimentation process in the prior art, and the struvite crystallization device can prevent struvite from accumulating at the bottom of a crystallization tank to form hardening by stirring mixed liquid in the crystallization tank.

The technical scheme adopted by the invention is as follows:

a struvite crystallization apparatus comprising:

the device comprises a crystallizing tank, wherein the bottom of the crystallizing tank is provided with a slag outlet, the side wall of the bottom of the crystallizing tank is provided with a sewage inlet, an additive inlet and a circulating water inlet, and the side wall of the top of the crystallizing tank is provided with a circulating water outlet and an overflow port;

the stirring device is arranged at the top of the crystallization tank;

one end of the circulating mechanism is communicated with the circulating outlet, and the other end of the circulating mechanism is communicated with the circulating water inlet;

the auxiliary material adding mechanism is communicated with the additive inlet;

the external mixing mechanism is communicated with the sewage inlet;

wherein the height of the circulating water outlet is lower than that of the overflow port; the additive inlet, the circulating water inlet and the sewage inlet are arranged on the side wall of the bottom of the crystallizing tank, so that liquid entering the crystallizing tank moves from the bottom to the top, the mixing of the additive and the sewage is realized by matching with a stirring device, and the formation of struvite crystallization is accelerated.

Optionally, the bottom of the crystallizer is gathered along the radial direction thereof, and the slag outlet is arranged at the lowest position of the bottom of the crystallizer.

Optionally, the crystallization tank comprises:

the section of the slag discharging part is conical, the slag discharging hole is arranged at one end with a small diameter of the slag discharging part, and the circulating water inlet is arranged on the side wall of the slag discharging part;

the mixing part is connected with one end with a large diameter of the slag discharging part at one end, and the sewage inlet and the additive inlet are arranged on the side wall of the mixing part and are close to the slag discharging part; and

the stirring part is arranged at the other end of the mixing part, the overflow port and the circulating water outlet are arranged on the side wall of the stirring part, and the stirring device is arranged in the stirring part;

wherein the diameter of the stirring part is larger than that of the mixing part.

Optionally, the joint of the stirring part and the mixing part is provided with a conical surface, and one end with a small diameter is arranged towards the mixing part.

Optionally, the stirring device comprises:

the stirring rod is arranged on the inner side wall of the top of the crystallizing tank;

the stirring blade is arranged on the stirring rod; and

and the power output end of the stirring motor is connected with the stirring rod.

Optionally, the circulation mechanism comprises:

one end of the circulating water pipe is communicated with the circulating water outlet, and the other end of the circulating water pipe is communicated with the circulating water inlet; and

and the circulating water pump is arranged on the circulating water pipe.

Optionally, the auxiliary material adding mechanism includes:

an additive inlet, one end of which is communicated with the additive inlet;

the other end of the additive pipeline is communicated with the additive storage tank; and

and the adding pump is arranged on the adding pipeline.

Optionally, the external mixing mechanism comprises:

a wastewater storage tank;

the first storage barrel is communicated with the wastewater storage tank;

the second storage barrel is communicated with the wastewater storage tank;

one end of the connecting pipe is communicated with the wastewater storage tank, and the other end of the connecting pipe is communicated with the wastewater inlet; and

and the delivery pump is arranged on the connecting pipe.

Optionally, the first storage tank and the second storage tank feed the wastewater storage tank through a vibration pump.

Optionally, the axes of the sewage inlet and the additive inlet are in the same plane.

Compared with the prior art, the invention has the beneficial effects that:

1. the main adoption is upflow hydraulic stirring and overflow water discharge, which can effectively save the cost required by stirring and water discharge.

2. Struvite deposits in this reactor, receives from the bottom up hydraulic power and stirs, and area of contact is bigger, and the collision between the increase struvite granule accelerates the formation speed that the struvite deposits, and the volume of increase struvite granule does benefit to the quick sediment of struvite granule, saves time.

3. The bottom of the crystallizing tank is conical, which is beneficial to the collection of the sediment of struvite particles and reduces the hardening of the sediment.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the internal structure of a struvite crystallization device.

Fig. 2 is a schematic plan view of a struvite crystallization device.

FIG. 3 is a schematic view showing the structure of a struvite crystallization device in which the slag discharge part and the mixing part are smoothly connected.

Reference numerals:

1. a crystallization tank; 11. a slag outlet; 12. a sewage inlet; 13. an additive inlet; 14. a circulating water inlet; 15. a circulating water outlet; 16. an overflow port; 17. a slag discharge part; 18. a mixing section; 19. a stirring section; 2. a stirring device; 21. a stirring rod; 22. a stirring blade; 23. a stirring motor; 3. a circulating mechanism; 31. a circulating water pipe; 32. a water circulating pump; 4. an auxiliary material adding mechanism; 41. an addition pipe; 42. an additive storage tank; 43. adding a pump; 5. an external mixing mechanism; 51. a wastewater storage tank; 52. a first storage vat; 53. a second storage vat; 54. a connecting pipe; 55. a delivery pump; 56. a vibration pump.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate an orientation or positional relationship based on that shown in the drawings, or the orientation or positional relationship conventionally used in the use of the products of the present invention, or the orientation or positional relationship conventionally understood by those skilled in the art, are merely for convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present invention provides a struvite crystallization apparatus, including: the device comprises a crystallization tank 1, a stirring device 2, a circulating mechanism 3, an auxiliary material adding mechanism 4 and an external mixing mechanism 5; the bottom of the crystallization tank 1 is provided with a slag outlet 11, the side wall of the bottom of the crystallization tank 1 is provided with a sewage inlet 12, an additive inlet 13 and a circulating water inlet 14, and the side wall of the top of the crystallization tank 1 is provided with a circulating water outlet 15 and an overflow port 16; the stirring device 2 is arranged at the top of the crystallization tank 1; one end of the circulating mechanism 3 is communicated with the circulating outlet, and the other end of the circulating mechanism is communicated with the circulating water inlet 14; the auxiliary material adding mechanism 4 is communicated with an additive inlet 13; the external mixing mechanism 5 is communicated with the sewage inlet 12; the height of the circulating water outlet 15 is lower than that of the overflow port 16; the additive inlet 13, the circulating water inlet 14 and the sewage inlet 12 are arranged on the side wall of the bottom of the crystallizing tank 1, so that the liquid entering the crystallizing tank 1 moves from the bottom to the top, and the mixing device 2 is matched to realize the mixing of the additive and the sewage and simultaneously realize the formation of the struvite crystals.

In the using process, sewage enters the crystallization tank 1 from the external mixing mechanism 5, magnesium salts and phosphates are added into the sewage at the moment, auxiliary materials are added into the crystallization tank 1 through the auxiliary material adding mechanism 4, when the height of the sewage submerges part of the structure of the stirring mechanism, the stirring mechanism stirs the sewage and additives, and the sewage and the additives are continuously conveyed to the crystallization tank 1 in the stirring process, so that the liquid level in the crystallization tank 1 rises to the position of an overflow port 16, and as the position of a circulating water outlet 15 is lower than the position of the overflow port 16, part of the liquid in the crystallization tank 1 is extracted through the circulating mechanism 3 to circulate, so that the mixed liquid enters the crystallization tank 1 again through a circulating water inlet 14 on the side wall of the bottom of the crystallization tank 1 to form up-flow hydraulic stirring with the additives and the sewage, and the additives and the sewage are conveniently and rapidly mixed; meanwhile, the crystallized struvite is conveniently driven to move, so that the struvite collides with each other, the volume is rapidly increased, and then the struvite is deposited. The embodiment can effectively save the cost required by stirring and water outlet through the upflow hydraulic stirring and the overflow water outlet. Struvite deposits in this reactor, receives from the bottom up hydraulic power and stirs, and area of contact is bigger, and the collision between the increase struvite granule accelerates the formation speed that the struvite deposits, and the volume of increase struvite granule does benefit to the quick sediment of struvite granule, saves time.

In another embodiment, as shown in FIG. 3, in order to collect struvite, the bottom of the crystallization tank 1 is gathered in its radial direction, and the tap hole 11 is provided at the lowest portion of the bottom of the crystallization tank 1.

In another embodiment, as shown in fig. 1, in order to facilitate the precipitation and collection of struvite particles and reduce the caking of the precipitate, the crystallization tank 1 comprises: a slag outlet 17, a mixing part 18 and a stirring part 19, wherein the section of the slag outlet 17 is tapered, a slag outlet 11 is arranged at one end of the slag outlet 17 with a small diameter, and a circulating water inlet 14 is arranged on the side wall of the slag outlet 17; one end of the mixing part 18 is connected with one end with a large diameter of the slag discharging part 17, and the sewage inlet 12 and the additive inlet 13 are arranged on the side wall of the mixing part 18 and close to the slag discharging part 17; the stirring part 19 is arranged at the other end of the mixing part 18, the overflow port 16 and the circulating water outlet 15 are arranged on the side wall of the stirring part 19, and the stirring device 2 is arranged in the stirring part 19; the diameter of the stirring section 19 is larger than the diameter of the mixing section 18.

The cross-section of slag tap portion 17 is the toper, make things convenient for after the struvite deposit to collect, it is convenient for sewage and the additive that gets into in crystallizer 1 to be by the flash mixed to set up sewage import 12 and additive import 13 on the lateral wall of mixing portion 18, agitating unit 2 installs in stirring portion 19 simultaneously, the diameter of stirring portion 19 is greater than the diameter of mixing portion 18 and is convenient for agitating unit 2 work, agitating unit 2 only stirs the liquid in stirring portion 19, through the upstream formula water conservancy stirring in the mixing portion 18, reduce the required power of agitating unit 2 motion, can save the cost.

In another embodiment, as shown in FIGS. 1 and 2, in order to allow the liquid in the crystallization tank 1 to be sufficiently stirred during the stirring, the junction of the stirring section 19 and the mixing section 18 has a tapered surface, and the end having a smaller diameter is disposed toward the mixing section 18. The blockage at the joint of the stirring part 19 and the mixing part 18 is avoided, so that the liquid is not sufficiently mixed.

In another embodiment, as shown in fig. 1 and 2, in order to facilitate thorough mixing of the liquid in the crystallization tank 1, the stirring device 2 includes: a stirring rod 21, a stirring blade 22 and a stirring motor 23; the stirring rod 21 is arranged on the inner side wall of the top of the crystallization tank 1; the stirring blades 22 are arranged on the stirring rod 21; the power output end of the stirring motor 23 is connected with the stirring rod 21.

In the using process, the stirring motor 23 drives the stirring rod 21 to rotate, the stirring rod 21 drives the stirring blade 22 to rotate in the rotating process, the liquid in the crystallization tank 1 is stirred, and part of the liquid overflows through the overflow port 16 in the stirring process.

In another embodiment, as shown in fig. 1 and 2, in order to improve the power of the upflow hydraulic stirring, the circulation mechanism 3 includes: one end of the circulating water pipe 31 is communicated with the circulating water outlet 15, and the other end of the circulating water pipe 31 is communicated with the circulating water inlet 14; the circulating water pump 32 is installed on the circulating water pipe 31.

Draw forth through the liquid with in the crystallizer 1 and circulate, can improve the mobility of liquid in the crystallizer 1, improve the power of STREAMING hydraulic stirring simultaneously, make sewage and additive rapid mixing in the crystallizer 1 even, then the crystallization is the struvite, sewage makes the area of contact between the struvite bigger at the stirring in-process, collision between the increase struvite granule, the formation speed that the struvite deposits with higher speed, the volume of increase struvite granule does benefit to the quick sediment of struvite granule, and the time is saved.

In another embodiment, as shown in fig. 1 and 2, in order to add the additive during the mixing process, the auxiliary material adding mechanism 4 includes: an additive pipeline 41, an additive storage tank 42 and an additive pump 43, wherein one end of the additive pipeline 41 is communicated with the additive inlet 13, and the other end is communicated with the additive storage tank 42; an addition pump 43 is installed on the addition pipe 41. The addition of the additive into the crystallization tank 1 is continued by an addition pump 43.

In another embodiment, as shown in fig. 1 and 2, in order to facilitate the addition of a portion of the additive to the contaminated water at the time of the exterior, the external mixing mechanism 5 includes: waste water holding vessel 51, first storage vat 52, second storage vat 53, connecting pipe 54 and delivery pump 55, first storage vat 52, second storage vat 53 and waste water holding vessel 51 intercommunication, conveniently carry the additive to waste water holding vessel 51 in, the one end and the waste water holding vessel 51 of connecting pipe 54 are connected, and the other end is connected with sewage inlet 12, and delivery pump 55 sets up on connecting pipe 54.

In another embodiment, as shown in fig. 1 and 2, a vibration pump 56 is provided in order to automatically add the phosphorus salt and the magnesium salt in the first storage tank 52 and the second storage tank 53 to the wastewater storage tank 51, and the phosphorus salt and the magnesium salt are added to the wastewater storage tank 51 by the vibration of the vibration pump 56.

In another embodiment, as shown in fig. 1 and 2, in order to facilitate convection of the sewage and the additive, the axes of the sewage inlet 12 and the additive inlet 13 are in the same plane.

In other embodiments, as shown in fig. 1 and 2, to further facilitate convection of the sewage and the additive, the axes of the sewage inlet 12 and the additive inlet 13 are in the same horizontal plane.

The specific working principle is as follows:

when the device is used, the sewage added with magnesium salts and phosphates is conveyed into the crystallizing tank 1 through the conveying pump 55, the alkali liquor is conveyed into the crystallizing tank 1 through the adding pump 43, the sewage added with magnesium salts and phosphates and the alkali liquor form convection in the entering process, the sewage added with magnesium salts and phosphates is conveniently and rapidly mixed with the alkali liquor, when the height of the liquid in the crystallizing tank 1 reaches the height of the circulating water inlet 14, the circulating water pump 32 works to drain the liquid to the circulating water inlet 14 below the crystallizing tank 1, the power of up-flow hydraulic stirring is increased, as the sewage added with magnesium salts and phosphates and the alkali liquor are continuously conveyed into the crystallizing tank 1, the liquid level in the crystallizing tank 1 rises, when the liquid level reaches the overflow port 16, the liquid is discharged through the overflow port 16, the crystallized struvite sinks into the slag tapping part 17 under the action of gravity, at the moment, the slag tapping port 11 is closed through a valve, after the sewage treatment is finished and the struvite needs to be cleaned, the valve of the slag outlet 11 is opened to discharge. The up-flow hydraulic stirring and overflow water discharging are mainly adopted, so that the cost required by stirring and water discharging can be effectively saved. Struvite deposits in this reactor, receives from the bottom up hydraulic power and stirs, and area of contact is bigger, and the collision between the increase struvite granule accelerates the formation speed that the struvite deposits, and the volume of increase struvite granule does benefit to the quick sediment of struvite granule, saves time. The bottom of the crystallizing tank 1 is conical, which is beneficial to the collection of the deposition of struvite particles and reduces the hardening of the deposition.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A struvite crystallization device, comprising:

the stirring device is arranged at the top of the crystallization tank;

the external mixing mechanism is communicated with the sewage inlet;

2. A struvite crystallization device according to claim 1, wherein the bottom of the crystallization tank converges in a radial direction thereof, and the slag outlet is provided at the lowest bottom of the crystallization tank.

3. A struvite crystallization apparatus of claim 1, wherein the crystallization tank comprises:

4. A struvite crystallization device of claim 3, wherein a junction of the stirring section and the mixing section has a tapered surface, and an end having a small diameter is disposed toward the mixing section.

5. A struvite crystallization device of claim 1, wherein the stirring device comprises:

the stirring blade is arranged on the stirring rod; and

6. The struvite crystallization apparatus of claim 1, wherein the circulation mechanism comprises:

and the circulating water pump is arranged on the circulating water pipe.

7. The struvite crystallization device of claim 1, wherein the auxiliary material adding mechanism comprises:

an additive inlet, one end of which is communicated with the additive inlet;

and the adding pump is arranged on the adding pipeline.

8. The struvite crystallization device of claim 1, wherein the external mixing mechanism comprises:

a wastewater storage tank;

the first storage barrel is communicated with the wastewater storage tank;

the second storage barrel is communicated with the wastewater storage tank;

and the delivery pump is arranged on the connecting pipe.

9. The struvite crystallization device of claim 8, wherein the first storage tank and the second storage tank feed the wastewater storage tank via a vibratory pump.

10. A struvite crystallization apparatus according to claim 1, wherein the axes of the sewage inlet and the additive inlet are in the same plane.