CN111592101A

CN111592101A - Separation device, sewage treatment system and sewage treatment method

Info

Publication number: CN111592101A
Application number: CN202010516543.4A
Authority: CN
Inventors: 宋岱峰; 文晓庆; 柳杰祥
Original assignee: Sichuan Meifote Eco Technology Co ltd
Current assignee: Sichuan Meifote Eco Technology Co ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2020-08-28

Abstract

The invention discloses a separation device, a sewage treatment system and a sewage treatment method. The separation device comprises: the outer isolation structure forms an outer container, the top of the outer container is provided with a feed inlet for the inflow of a mixture at least containing water and activated sludge in the aeration tank, and the bottom of the outer container is provided with a sludge-water separation zone; the inner isolation structure is positioned in the outer container and forms an inner container, the interval between the inner container and the outer container forms a channel positioned below the feed inlet, and the channel is communicated with the inner container through the mud-water separation area; the clear liquid separation structure comprises an overflow groove horizontally arranged in the inner container and a liquid discharge pipe penetrating through the outer side isolation structure, and water obtained by separation in the mud-water separation region overflows into the overflow groove and then is output from the liquid discharge pipe; the channels are asymmetrically distributed around the overflow launder. The mud and water flowing out of the channel form a circular flow, and the mud and water separation path is increased, so that the mud and water separation can be realized in a limited volume in a short time.

Description

Separation device, sewage treatment system and sewage treatment method

Technical Field

The invention relates to the technical field of aerobic activated sludge process sewage treatment, in particular to a separation device, a sewage treatment system and a sewage treatment method.

Background

At present, the main core technologies of domestic sewage treatment are an activated sludge process and a biofilm process. The activated sludge method is carried out in an aeration tank, sewage is introduced into the aeration tank, the sewage and the activated sludge in the aeration tank are fully mixed in the dissolved oxygen aeration process to carry out biological oxidation reaction, then the mixture is subjected to solid-liquid separation, and finally organic matters, total nitrogen and total phosphorus in the sewage are removed.

In the traditional sewage treatment process by an aerobic activated sludge method, dissolved oxygen aeration and biological oxidation reaction are firstly carried out in an aeration tank, and then solid-liquid separation is carried out on a mud-water mixture through a sedimentation tank. In order to ensure that the aeration tank has a certain sludge concentration, all or part of the activated sludge obtained by solid-liquid separation in the sedimentation tank must flow back to the aeration tank to participate in the biological reaction process again. In the process, the activated sludge can continuously flow circularly between the aerobic tank and the sedimentation tank, so that on one hand, a large amount of energy is consumed, and on the other hand, the biological activity of the activated sludge is reduced due to the continuous change of the growth environment of microorganisms, and the biodegradation reaction is not facilitated.

To this end, the applicant filed an invention patent application entitled "a sewage treatment system" with publication number CN110451722A, which discloses an integrated three-phase separation device that can be placed directly into an aeration tank for use. The three-phase separation device is provided with a mud-water separation zone, and can carry out solid-liquid separation on mud-water mixture entering the three-phase separation device to realize the separation of water and activated sludge, the upper part of the mud-water separation zone is provided with a clear liquid separation structure to output the water separated by the mud-water separation zone, the lower part of the mud-water separation zone is provided with a sewage discharge outlet to return the activated sludge separated by the mud-water separation zone to an aeration tank, and the sewage discharge outlet is provided with an air baffle plate to prevent the gas in the aeration tank; therefore, the three-phase separation device has the advantages of saving the secondary sedimentation tank and the power consumption of sludge backflow.

In order to improve the treatment capacity, two symmetrically distributed channels are arranged to enable more muddy water to enter the muddy water separation area, but the following problems are caused in practical application: in the mud-water separation zone, the solid-liquid separation is actually a phase-change precipitation device, and due to mutual impact of mud and water entering from two sides, on one hand, the resistance of sludge sedimentation is increased, and on the other hand, the movement path of the mud and water is shortened, so that the solid-liquid separation effect cannot meet the requirement. In order to improve the solid-liquid separation effect, a filtering separation structure is arranged between the mud-water separation zone and the clear liquid separation structure, and an inclined plate, an inclined pipe, quartz sand, an activated carbon filter layer and the like are adopted to intercept activated sludge so as to reduce the solid content in water output by the clear liquid separation structure. But the filtering separation structure requires occasional cleaning and maintenance, which on the other hand significantly increases the costs.

Disclosure of Invention

The invention mainly aims to provide a separation device, a sewage treatment system and a sewage treatment method, and aims to solve the technical problems that a sludge-water separation zone in the prior art is poor in solid-liquid separation effect and a filtering and separating structure needs to be cleaned and maintained.

In order to achieve the above object, according to one aspect of the present invention, there is provided a separation device. When in use, the separation device is placed in an aeration tank to realize the separation of water and activated sludge and output the separated water and return the separated activated sludge to the aeration tank, and the separation device specifically comprises:

an outer isolation structure forming an outer container, wherein the top of the outer container is provided with a feed inlet for allowing a mixture at least containing water and activated sludge in the aeration tank to flow in, and the bottom of the outer container is provided with a sludge-water separation zone and an activated sludge discharge outlet;

the inner isolation structure is positioned in the outer container and forms an inner container, the interval between the inner container and the outer container forms a channel positioned below the feed inlet, and the channel is communicated with the inner container through the mud-water separation area;

the clear liquid separation structure comprises an overflow groove horizontally arranged in the inner container and a liquid discharge pipe penetrating through the outer side isolation structure, and water obtained by separation in the mud-water separation region overflows into the overflow groove and then is output from the liquid discharge pipe;

the channels are asymmetrically distributed around the overflow launder.

Therefore, when muddy water entering the channel from the feed port moves to the activated sludge discharge port below, the muddy water collides with the activated sludge discharge port to accelerate in the horizontal direction, and the channel is not distributed on the opposite side, namely, no muddy water flows into the muddy water separation area on the opposite side, so that the muddy water flowing out of the channel flows to the opposite side of the channel, flows upwards slowly while flowing horizontally, forms a circulation flow, increases a muddy water separation path, and can achieve muddy water separation in a short time in a limited volume. Therefore, the filtering and separating structure on the upper part is not arranged, and the cost is effectively reduced.

Further, the channel is provided only on one axial side of the overflow trough.

From this, simple structure not only can show extension muddy water circulation length, promotes the solid-liquid separation effect, can form bigger oxygen deficiency region moreover, is convenient for effectively get rid of pollutants such as ammonia nitrogen, total nitrogen.

Furthermore, the distance between one axial side wall of the overflow groove and the inner wall of the inner container where the channel is located is less than or equal to 5 cm.

Therefore, the channel and the overflow groove are integrally positioned at the same axial side of the separation device, so that water obtained by settling and separating mud and water flowing from the channel to the mud-water separation area can further prolong a mud-water separation path when the water mainly flows into the overflow groove from the other side wall of the overflow groove, and the solid-liquid separation effect is improved.

Further, one axial side wall of the overflow groove is connected with the inner wall of the inner container where the channel is located.

Therefore, water obtained by separating all the mud-water separation zones enters from the side of the overflow trough, which is far away from the channel, and the optimal solid-liquid separation effect can be obtained.

Furthermore, an overflow notch is arranged on the other side wall of the overflow groove in the axial direction, which is not connected with the inner container, and the width of the overflow notch is gradually reduced from top to bottom.

Therefore, the water overflow amount can be automatically changed according to the gap width, and the hydraulic stability can be maintained.

Furthermore, the liquid discharge pipe passes through the outer isolation structure without a channel and then is connected with the overflow groove.

Therefore, the muddy water inlet channel can be prevented from being disturbed.

Further, the drain pipe is connected with the bottom of the overflow groove.

Therefore, the water in the overflow groove can be promoted to flow into the liquid discharge pipe.

Further, the outer side isolation structure connected with the liquid discharge pipe is vertically arranged.

Therefore, when the plurality of separating devices are connected through the liquid discharge pipe to form parallel connection for use, the occupied area can be saved to the maximum extent.

Furthermore, a connecting component is arranged at the output end of the liquid discharge pipe; the connecting assembly comprises a flange arranged at the output end, and a bolt and a nut matched with the flange hole.

Therefore, the installation and the disassembly are convenient. When the separating device is used in parallel, a gasket can be arranged between the two flanges to achieve the sealing effect.

In order to achieve the above object, according to another aspect of the present invention, there is also provided a sewage treatment system. The sewage treatment system is provided with a plurality of the separation devices, and the liquid discharge pipes of the adjacent separation devices are communicated.

In order to achieve the above object, according to another aspect of the present invention, there is also provided a sewage treatment method. The sewage treatment method comprises the step of adopting the sewage treatment system.

The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:

fig. 1 is a perspective view of a separation device according to example 1 of the present invention.

Fig. 2 is a side view of the separation apparatus of example 1 of the present invention.

Fig. 3 is a side view of the separation apparatus of example 2 of the present invention.

FIG. 4 is a side view of a wastewater treatment system according to the invention.

The relevant references in the above figures are:

100-outer side isolation structure, 110-channel, 120-feed inlet, 200-inner side isolation structure, 210-sludge-water separation zone, 220-activated sludge discharge outlet, 310-overflow groove, 311-overflow notch, 320-liquid discharge pipe, 330-connecting component, 400-aeration tank, 410-aeration pipe, 420-support, 510-water collecting pipe and 520-branch pipe.

Detailed Description

The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:

the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.

Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

The terms and units in the description and claims, and the associated parts, are not to be construed as limiting the invention. For example, the terms "comprising," "having," and any variations thereof, are intended to cover non-exclusive inclusions. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The terms "inner," "outer," "upper," "bottom," "front," "back," and the like, as used herein, refer to an orientation or positional relationship, if any, that is based on the orientation or positional relationship shown in the drawings, which is meant only to facilitate describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation. The term "activated sludge" refers to a collective term for populations of microorganisms and the organic and inorganic materials to which they are attached. The term "aeration" refers to the process of forced transfer of oxygen from the air into the liquid, with the aim of obtaining sufficient dissolved oxygen.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example 1

The separation apparatus of the present embodiment is disposed in the aeration tank 400 to achieve separation of water from the activated sludge and to output the separated water and return the separated activated sludge to the aeration tank 400. The separation device shown in fig. 1 specifically includes:

an outer isolation structure 100, the outer isolation structure 100 forming an outer container, the outer container having a feed inlet 120 at a top thereof for allowing a mixture containing at least water and activated sludge in an aeration tank 400 to flow therein, and a sludge-water separation zone 210 and an activated sludge discharge outlet 220 at a bottom thereof;

an inner isolation structure 200, wherein the inner isolation structure 200 is positioned in the outer container and forms an inner container, the interval between the inner container and the outer container forms a channel 110 positioned below the feed inlet 120, and the channel 110 is communicated with the inner container through a mud-water separation area 210;

the clear liquid separating structure comprises an overflow groove 310 horizontally arranged in the inner container and a liquid discharge pipe 320 penetrating through the outer side isolation structure 100, and water separated by the mud-water separating area 210 overflows into the overflow groove 310 and then is output from the liquid discharge pipe 320;

the channels 110 are asymmetrically distributed around the overflow trough 310, as follows: the cross section of the inner container is rectangular, the overflow groove 310 is bridged between two short sides of the inner container, the channel 110 is arranged on one axial side of the overflow groove 310, and the distance between one axial side wall of the overflow groove 310 and the inner wall of the inner container where the channel 110 is arranged is 2 cm.

The two axial sides of the overflow groove 310 are both provided with overflow notches 311, and the widths of the overflow notches 311 are gradually decreased from top to bottom.

The drain pipe 320 is connected to the bottom of the overflow bath 310.

In fig. 1, the direction indicated by the arrow is the water flow direction.

Example 2

Compared to example 1, the separation device of this example has the following differences: as shown in fig. 2, one axial side wall of the overflow groove 310 is directly connected to the inner wall of the inner vessel where the channel 110 is located, and only the other axial side wall of the overflow groove 310, which is not connected to the inner vessel, is provided with an overflow notch 311.

In the embodiment 1-2, the drain pipe 320 passes through the outer isolation structure 100 without the channel 110 and then is connected to the overflow trough 310, the outer isolation structure 100 connected to the drain pipe 320 is vertically placed, the output end of the drain pipe 320 is provided with the connection assembly 330, and the connection assembly 330 includes a flange arranged at the output end and a bolt and a nut adapted to a hole of the flange. Thus, a plurality of the separation devices of example 1 or example 2 are used in series through the connection assembly 330, and a sewage treatment system is obtained.

In the sewage treatment system shown in fig. 3, the separation devices are symmetrically distributed on both sides of the water collecting pipe 510, and the branch pipe 520 of the water collecting pipe 510 is connected with the drain pipe 320 through the connecting assembly 330, so that water is centrally output; particularly, when the drain pipe 320 is connected to the bottom of the overflow bath 310, the drainage speed is faster. A bracket 420 is provided in the aeration tank 400, and the separation apparatus is connected to the bracket 420 by a lifting lug provided outside the outer partition structure 100.

In the sewage treatment method of the present invention, the above-described sewage treatment system is used, when in use, sewage is introduced into the aeration tank 400 containing activated sludge, the sewage treatment system is installed in the aeration tank 400, then the aeration tank 400 is aerated through the aeration pipe 410 at the bottom of the aeration tank 400, a sludge-water mixture containing sewage and activated sludge enters the passage 110 from the feed inlet 120 of the separation device, then efficient solid-liquid separation is achieved in the sludge-water separation zone 210, the separated water overflows from the overflow notch 311 into the overflow launder 310 and then is discharged from the liquid discharge pipe 320, and the separated activated sludge and other impurities are returned to the aeration tank 400 from the activated sludge discharge port 220.

The effect of the invention is shown in table 1 together with the invention patent application having publication No. CN110451722A entitled "a sewage treatment system". The "hydraulic surface load" in table 1 is an important parameter of the settling efficiency of the inner vessel, also referred to as surface hydraulic load or overflow rate, and refers to the amount of water that can be handled per unit time per unit surface area of the inner vessel.

TABLE 1

As can be seen from Table 1, the separation apparatus of the present invention is more advantageous in comparison with various indexes.

The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.

Claims

1. The separation device is placed in an aeration tank (400) in use to realize the separation of water and activated sludge and output the separated water and return the separated activated sludge to the aeration tank (400), and specifically comprises:

an outer isolation structure (100), wherein the outer isolation structure (100) forms an outer container, the top of the outer container is provided with a feed inlet (120) for allowing a mixture at least containing water and activated sludge in an aeration tank (400) to flow in, and the bottom of the outer container is provided with a sludge-water separation area (210) and an activated sludge discharge outlet (220);

an inner isolation structure (200), wherein the inner isolation structure (200) is positioned in the outer container and forms an inner container, the interval between the inner container and the outer container forms a channel (110) positioned below the feed opening (120), and the channel (110) is communicated with the inner container through a mud-water separation area (210);

the clear liquid separation structure comprises an overflow groove (310) horizontally arranged in the inner container and a liquid discharge pipe (320) penetrating through the outer side isolation structure (100), and water separated by the mud-water separation region (210) overflows into the overflow groove (310) and then is output from the liquid discharge pipe (320);

the method is characterized in that: the channels (110) are asymmetrically distributed about the overflow trough (310).

2. The separation device of claim 1, wherein: the channel (110) is provided only on one axial side of the overflow trough (310).

3. The separation device of claim 2, wherein: the distance between one axial side wall of the overflow groove (310) and the inner wall of the inner container where the channel (110) is located is less than or equal to 5 cm.

4. A separation device as claimed in claim 3, wherein: one axial side wall of the overflow groove (310) is connected with the inner wall of the inner container where the channel (110) is positioned.

5. The separation device of claim 4, wherein: an overflow notch (311) is arranged on the other side wall of the overflow groove (310) in the axial direction, which is not connected with the inner container, and the width of the overflow notch (311) is gradually reduced from top to bottom.

6. The separation device of claim 1, wherein: the liquid discharge pipe (320) passes through the outer isolation structure (100) without the channel (110) and then is connected with the overflow groove (310); the drain pipe (320) is connected with the bottom of the overflow trough (310).

7. The separation device of claim 6, wherein: the outer side isolation structure (100) connected with the liquid discharge pipe (320) is vertically placed.

8. The separation device of claim 1, wherein: the output end of the liquid discharge pipe (320) is provided with a connecting component (330); the connecting assembly (330) comprises a flange arranged at the output end and a bolt and a nut matched with the flange hole.

9. Sewage treatment system, its characterized in that: having a plurality of separating devices according to any of claims 1-8, the discharge conduits (320) of adjacent separating devices being in communication.

10. A method of treating wastewater comprising using the wastewater treatment system of claim 9.