TWI747759B - Sewage treatment method and device - Google Patents

Abstract

A sewage treatment method and device. The method includes the following steps: a1) the sewage is treated by a previous treatment structure to produce first treated water; a2) the first treated water is filtered with a first microfiltration structure to produce second treated water And the first sludge; a3) treat the second treated water with an aerobic biological reaction structure to produce third treated water; a4) filter the third treated water with a second microfiltration structure to produce fourth treated water and The second sludge; a5) the first sludge and the second sludge are treated with a mixing and thickening structure to produce the third sludge; a6) the third sludge is treated with an anaerobic digestion structure to produce methane and the first sludge Fourth, sludge; this method can achieve the purpose of making the treated water meet the discharge standard, facilitating the recycling and reuse of the treated water, increasing methane production, saving land and saving construction costs.

Description

Sewage treatment method and device

The present invention relates to a sewage treatment method and device; in particular, it relates to a sewage treatment method and device that uses a first microfiltration structure and a second microfiltration structure to replace conventional primary sedimentation tanks and secondary sedimentation tanks.

The main purpose of sewage treatment is to avoid discharge water pollution and sludge reduction. Many different sewage treatment methods and devices can be used in various sewage treatment plants today. Conventional sewage treatment equipment generally includes pre-treatment structure, preliminary sedimentation tank, secondary sedimentation tank, aerobic biological treatment structure, anaerobic biological digestion structure, etc. It can make the finally produced treated water meet the discharge standard or facilitate recycling and reuse. In addition, it can also reduce the amount of sludge solids and save subsequent treatment costs. Furthermore, it can also produce methane, increasing economic benefits.

However, conventional sewage treatment methods and devices also have the following deficiencies: 1. The functions of structures such as coarse grids and fine grids are insufficient, and it is difficult to screen out suspended solids such as hair and floss, which causes operation problems in subsequent treatment procedures. For example, it affects motors, pipelines and membrane units; 2. The solid-liquid separation effect of the preliminary sedimentation tank and the secondary sedimentation tank is poor and the efficiency is also poor, so a large area of the preliminary sedimentation tank and the secondary sedimentation tank need to be set up, resulting in a large area , High cost and other issues; 3. Preliminary sedimentation tank and The solid-liquid separation effect of the secondary sedimentation tank is poor, such as the failure to effectively remove the suspended solids and grease and other impurities, which affects the subsequent operations, especially the treatment efficiency of the anaerobic digestion structure and the methane output; 4. The preliminary sedimentation tank and The solid-liquid separation efficiency of the secondary sedimentation tank is poor and it takes a long time.

In view of this, the inventors have worked hard and studied actively, combined with years of experience in related product research, and after continuous experiments and improvements, finally developed the present invention.

The purpose of the present invention is to provide a sewage treatment method that can make the treated water meet the discharge standard, facilitate the recovery and reuse of the treated water, increase the methane output, save the land and save the construction cost.

The method of the present invention to achieve the above objectives includes the following steps: a1) the previous treatment structure treats sewage to produce first treated water; a2) uses a first microfiltration structure to filter the first treated water to produce second treated water and first sewage Mud; the first microfiltration structure contains a first metal woven filter screen and a first circulating backwash structure; a3) treat the second treated water with an aerobic biological reaction structure to produce the third treated water; a4) use a first Two microfiltration structures filter the third treated water to produce fourth treated water and second sludge; the second microfiltration structure contains a second metal woven filter and a second circulating backwash structure; a5) to mix and concentrate the structure Treat the first sludge and the second sludge to produce the third sludge; a6) Treat the third sludge with an anaerobic digestion structure to produce methane and the fourth sludge.

Another object of the present invention is to provide a Sewage treatment equipment that combines discharge standards, facilitates the recycling and reuse of treated water, increases methane production, saves land and saves construction costs.

The structure of the present invention to achieve the above-mentioned object includes: a first microfiltration structure connected to the pre-treatment structure to receive the first treated water; A treated water to produce the second treated water and the first sludge; an aerobic biological reaction structure connected to the first microfiltration structure to receive the second treated water, and the second treated water can be treated by the aerobic biological reaction Generate third treated water; a second microfiltration structure connected to the aerobic biological reaction structure to receive the third treated water, with a second metal woven filter screen and a second circulating backwash structure, which can filter the third Treated water to produce fourth treated water and second sludge; a mixing and thickening structure that connects the first microfiltration structure and the second microfiltration structure to receive the first sludge and the second sludge, which can be mixed and concentrated The first sludge and the second sludge are used to produce a third sludge; and an anaerobic biological digestion structure is connected to the mixing and thickening structure to receive the third sludge, and the third sludge can be treated by anaerobic biological digestion Sludge to produce methane and fourth sludge.

Preferably, the first metal woven filter screen of the first microfiltration structure is a flat filter membrane; the first circulating backwash structure further includes: a base on which the first metal woven filter The first metal woven filter is in an inclined state and has a high side and a low side; and a water supply component connected to the pretreatment structure to receive the first treated water, and then to the first metal woven filter The high side supplies the first treated water, and the first treated water runs along the first metal The high side of the woven filter flows to the low side, and is separated by solid and liquid to form the second treated water and the first sludge. The second treated water passes through the first metal woven filter, and the first sludge is separated from The lower side direction of the first metal woven filter is detached; and a first collection component for collecting the second treated water passing through the first metal woven filter; and a track provided on the base; and a first A support structure is a seat that can slide along the track and is connected to a power component; and a first backwash jet structure is provided on the first support structure and is located under the first metal woven filter. The first backwash spray structure has at least one spray hole facing the first metal woven filter screen, so that the sprayed fluid can pass through the first metal woven filter screen; and a baffle plate, which is arranged on the first support structure , And located above the first metal woven filter screen and the first backwash jet structure; thereby increasing the efficiency of the first microfiltration structure.

Preferably, the second metal woven filter screen of the second microfiltration structure is a flat filter membrane; the second circulating backwash structure may further include: a base on which the second metal woven filter is provided A filter screen, the second metal woven filter screen is inclined and has a high side and a low side; and a water supply component connected to the aerobic biological reaction structure to receive the third treated water, and then weave to the second metal The high side of the filter screen supplies the third treated water, and the third treated water flows along the high side of the second metal woven filter screen to the low side, and is separated by solid and liquid to form fourth treated water and second sludge , The fourth treated water passes through the second metal woven filter, and the second sludge is separated from the lower side of the second metal woven filter; and a first collection component for collecting the second metal woven filter The first of the net Four treated water; and a track set on the base; and a second support structure, which is a seat slidable along the track, connected to a power component; and a second backwash jet structure, set on the On the second support structure and located below the second metal woven filter; the second backwash jet structure has at least one jet hole facing the second metal woven filter, so that the sprayed fluid can pass through the second The metal woven filter screen; and a baffle, arranged on the second supporting structure, and located above the second metal woven filter screen and the second backwash jet structure; thereby increasing the efficiency of the second microfiltration structure.

Preferably, the first metal woven filter screen of the first microfiltration structure is tubular and has a first end, a second end and a first space; the first circulating backwash structure may further include: a first A closing plate is provided at the first end of the first metal woven filter and has a first opening; and a second closing plate is provided at the second end of the first metal woven filter; and a first support The structure is a tube body with a first end and a second end. The first end of the first support structure is pivotally pivoted on the first closing plate; and at least one first backwash jet structure, consisting of a A first connecting pipe and a first water spray pipe are formed, the first connecting pipe communicates the first support structure and the first water spray pipe, and the first water spray pipe is arranged close to the first metal woven filter screen Where, the pipe wall of the first water spray pipe has a plurality of first water nozzles facing the first metal braided filter; and a backwash pump with a first water inlet pipe and a first water outlet pipe, the first outlet A water pipe communicates with the first support structure to inject pressurized water so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank covered on the first metal woven filter screen In addition, there is a storage space between the first metal woven filter screen, and the storage space of the storage tank is connected to the pre-treatment structure to receive the first treated water, so that the first treated water is separated by solid and liquid to form a second The second treated water and the first sludge, the second treated water passes through the first metal woven filter screen, and the first sludge settles at the bottom of the storage space of the storage tank; and a water outlet pipe connected to the first seal The first opening of the plate and the outside of the storage tank to discharge the second treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the first sludge; thereby increasing the first microfiltration structure effect.

Preferably, the second metal woven filter screen of the second microfiltration structure is tubular and has a first end, a second end and a first space; the second circulating backwash structure may further include: a first A closing plate is provided at the first end of the second metal woven filter screen and has a first opening; and a second closing plate is provided at the second end of the second metal woven filter screen; and a second support structure , Is a tube body with a first end and a second end, the first end of the second support structure is pivotably pivoted on the first closing plate; and at least one second backwash jet structure, composed of a first end A connecting pipe and a first water spray pipe are formed; the first connecting pipe connects the second support structure and the first water spray pipe, and the first water spray pipe is arranged near the second metal woven filter screen ; The wall of the first water spray pipe has a number of first water nozzles facing the second metal braided filter; and a backwash pump with a first water inlet pipe and a first water outlet pipe, the first water outlet pipe The second support structure is connected to inject pressurized water so that the pressurized water is sprayed from the first spray port of the first spray pipe; and a storage tank is covered on the second metal woven filter screen In addition, there is a storage space between the second metal woven filter screen, and the storage space of the storage tank is connected to the aerobic biological reaction structure to receive the third treated water, so that the third treated water is separated by solid and liquid. A fourth treated water and a second sludge are formed, the fourth treated water passes through the second metal woven filter, and the second sludge settles at the bottom of the storage space of the storage tank; and an outlet pipe connected to the first A first opening of a closed plate and the outside of the storage tank to discharge the fourth treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the second sludge; thereby adding a second microfiltration The efficacy of the structure.

In order to achieve the above-mentioned and other objectives, the technical means, components and effects adopted by the present invention are illustrated as follows with a preferred embodiment and figures.

100: Sewage treatment plant

1: Pre-processing structure

11: Sewage source

2, 2a, 2b: the first microfiltration structure

21, 21a, 21b: the first metal woven filter

211a: High side

212a: low side

213b: first end

214b: second end

215b: The first space

22, 22a, 22b: the first cycle backwash structure

221, 221a, 221b: the first backwash jet structure

2211: Jet Hole

2212b: The first connecting pipe

2213b: The first spray pipe

222, 222a, 222b: first support structure

2221b: first end

2222b: second end

223a: Pedestal

224a: water supply component

225a: The first collection component

226a: Orbit

227a: baffle

228b: The first closing plate

2281b: first opening

229b: second closing plate

230b: Backwash pump

2301b: The first water inlet pipe

2302b: The first outlet pipe

231b: storage tank

2311b: storage space

232b: Outlet pipe

233b: sewage pipe

3: Aerobic biological reaction structure

4, 4a, 4b: the second microfiltration structure

41, 41a, 41b: second metal woven filter

411a: high side

412a: low side

413b: first end

414b: second end

415b: The first space

42, 42a, 42b: second circulation backwash structure

421, 421a, 421b: second backwash jet structure

4212b: The first connecting pipe

4213b: The first spray pipe

422, 422a, 422b: second support structure

4221b: first end

4222b: second end

423a: Pedestal

424a: water supply component

425a: The first collection component

426a: Orbit

427a: baffle

428b: The first closing plate

4281b: first opening

429b: second closing plate

430b: Backwash pump

4301b: The first water inlet pipe

4302b: The first outlet pipe

431b: storage tank

4311b: storage space

432b: Outlet pipe

433b: Sewage pipe

5: Mixed and concentrated structure

6: Anaerobic biological digestion structure

[Figure 1] is a block diagram of the present invention.

[Figure 2] is a perspective view of the first microfiltration structure of the present invention.

[Figure 3] is a side view of the first microfiltration structure of the present invention.

[Figure 4] is a schematic diagram of the first backwash jet structure of the present invention and the first support structure to cyclically backwash most or all of the first metal woven filter.

[Figure 5] is a perspective view of the second microfiltration structure of the present invention.

[Figure 6] is a schematic diagram of a first modified embodiment of the first microfiltration structure of the present invention.

[Figure 7] is a schematic diagram of a first modified embodiment of the second microfiltration structure of the present invention.

[Figure 8] is a schematic diagram of a second modified embodiment of the first microfiltration structure of the present invention.

[Figure 9] is a schematic diagram of a second modified embodiment of the second microfiltration structure of the present invention.

The sewage treatment method of the present invention includes the following steps: a1) the previous treatment structure treats sewage to produce first treated water; a2) uses a first microfiltration structure to filter the first treated water to produce second treated water and first sludge ; The first microfiltration structure contains a first metal woven filter screen and a first circulating backwash structure; a3) Treat the second treated water with an aerobic biological reaction structure to produce the third treated water; a4) Use a second The microfiltration structure filters the third treated water to produce fourth treated water and second sludge; the second microfiltration structure contains a second metal woven filter and a second circulating backwash structure; a5) is treated with a mixed and concentrated structure The first sludge and the second sludge produce the third sludge; a6) The third sludge is treated with an anaerobic biological digestion structure to produce methane and the fourth sludge; this method can achieve the discharge of the treated water Standard, convenient treatment water recycling, increase methane output, save land and save construction costs and other purposes. This will be explained in detail below.

Figures 1 to 5 show a sewage treatment device 100 that can perform the aforementioned sewage treatment method. The sewage treatment device 100 includes: a pre-treatment structure 1, connected to a sewage source 11, and capable of treating sewage from the sewage source 11 Produce the first treated water; a first microfiltration structure 2, connected to the pre-treatment structure 1 to receive the first treated water, has a first metal woven filter mesh 21 and a first circulating backwash structure 22, which can process the first treatment Water to produce the second treated water and the first sludge; an aerobic biological reaction structure 3, connected to the first microfiltration structure 2 to receive the second treated water, the second treated water can be treated by the aerobic biological reaction to produce the third Treated water; a second microfiltration structure 4. Connect the aerobic biological reaction structure 3 to receive the third treated water. It has a second metal woven filter 41 and a second circulating backwashing structure 42, which can treat the third treated water to produce fourth treated water and second treated water. Sludge; a mixing and thickening structure 5, connecting the first microfiltration structure 2 and the second microfiltration structure 4 to receive the first sludge and the second sludge, can mix and thicken the first sludge and the second sludge A third sludge is produced; and an anaerobic biological digestion structure 6, which is connected to the mixing and thickening structure 5 to receive the third sludge. The third sludge can be treated by anaerobic biological digestion to produce methane and the fourth sludge.

Step a1) is the treatment of sewage by the previous treatment structure 1 to produce first treated water. The pre-treatment structure 1 is connected to a sewage source 11, and can treat sewage from the sewage source to produce first treated water. The pre-treatment structure 1 may include one or more of such structures as coarse grating, fine grating, vortex grit structure and/or aeration grit structure, and is mainly used to filter large debris and heavier sewage in sewage. Gravel is a conventional technique, so I won’t repeat it.

Step a2) is to filter the first treated water with a first microfiltration structure 2 to produce second treated water and first sludge; the first microfiltration structure 2 contains a first metal woven filter mesh 21 and a first circulating reactor Rinse structure 22. The first microfiltration structure 2 is connected to the pretreatment structure 1 to receive the first treated water, which can process the first treated water by swept-flow filtration.

The first circulating backwash structure 22 may have a first backwash spray structure 221 and a first support structure 222. The first backwash injection structure 221 is mainly used to inject fluids such as gas or liquid. A fluid injection structure may be used, for example, there are many injection holes 2211 facing the first metal woven filter screen 21. The tube body may be composed of more than one spray head (not shown in the figure). The first backwash jet structure 221 is characterized by only backwashing a part of the first metal woven filter screen 21, and can cooperate with the first support structure 222 to cyclically backwash most or all of the first metal woven filter screen 21 (such as 4); With this structure, when the first metal woven filter 21 filters the first treated water, backwashing can be performed at the same time.

Step a3) is to treat the second treated water with an aerobic biological reaction structure 3 to produce the third treated water. The aerobic biological reaction structure 3 is connected to the first microfiltration structure 2 to receive the second treated water, and the aerobic organisms can be used to purify the dissolved organic matter in the water. This is a conventional technology, so it will not be repeated.

Step a4) is to filter the third treated water with a second microfiltration structure 4 to produce fourth treated water and second sludge. The second microfiltration structure 4 may adopt a structure substantially the same as that of the first microfiltration structure 2, which includes a second metal woven filter screen 41 and a second circulating backwashing structure 42, and the second circulating backwashing structure 42 may have At least one second backwash jet structure 421 and one second support structure 422 are structures. The second microfiltration structure 4 is connected to the aerobic biological reaction structure 3 to receive the third treated water, which can process the third treated water by swept-flow filtration to produce the fourth treated water. The fourth treated water produced through the foregoing steps can already meet the discharge standard, and can also be discharged after post-treatment such as disinfection if necessary, and it can also be recycled and reused.

The first woven metal filter mesh 21 and the second woven metal filter mesh 41 of the first microfiltration structure 2 and the second microfiltration structure 4 are both microfiltration grade membranes. Choose different meshes and apertures (not shown in the figure) in response to, for example, different sewage conditions.

As mentioned above, the second microfiltration structure 4 can adopt approximately the same structure as the first microfiltration structure 2. The difference is that the conditions of the first and third treated water to be filtered are different, so you can choose different The mesh and pore size (not shown in the figure), for example, the first metal woven filter with a mesh size of 400~500mesh (mesh) and a pore size of 30~38μm (micrometer) can be used, and the mesh size can be 200~ A second metal woven filter screen (not shown in the figure) with 500 mesh (mesh) and a pore size of 25~75 μm (micrometers).

Step a5) is to process the first sludge and the second sludge with the mixing and thickening structure 5 to produce the third sludge. The mixing and thickening structure 5 connects the first microfiltration structure 2 and the second microfiltration structure 4 to receive the first sludge and the second sludge. It can be composed of a mixing tank and a thickening tank (not shown in the figure), and is mainly used The mixing and dewatering of sludge is a conventional technique, so it will not be repeated here.

Step a6) is to treat the third sludge with an anaerobic biological digestion structure 6 to produce methane and the fourth sludge. The anaerobic biological digestion structure 6 is connected to the mixing and thickening structure 5 to receive the third sludge, which is used in biodegradable wastewater to produce methane, which is a conventional technology, so it will not be repeated.

The main feature of the present invention is that the first microfiltration structure 2 and the second microfiltration structure 4 are used to replace the conventional primary sedimentation tank and the secondary sedimentation tank. The first microfiltration structure 2 and the second microfiltration structure 4 use the first circulating backwashing structure 22 and the second circulating backwashing structure 42 to perform backwashing together during filtration. The first microfiltration structure 2 and Compared with the conventional primary sedimentation tank, secondary sedimentation tank or membrane filtration structure with backwashing structure, the second microfiltration structure 4 has the following advantages. 1. The first microfiltration structure 2 and the second microfiltration structure 4 adopt sweep-flow filtration, so there is no need to wait for slow natural precipitation, and the filtration efficiency is high. 2. The first microfiltration structure 2 and the second microfiltration structure 4 can filter suspended matter such as cotton wool, hair, etc., which can prevent subsequent processing structures such as motors from being blocked by suspended matter. 3. The first microfiltration structure 2 and the second microfiltration structure 4 can increase the amount of sludge, thereby increasing the methane output of the anaerobic biological digestion structure; furthermore, the first microfiltration structure 2 and the second microfiltration structure 4 The first metal woven filter 21 and the second metal woven filter 41 of different meshes and pore sizes can be selected according to the sewage conditions, so the amount of sludge can be increased. In addition, the first microfiltration structure 2 and the second microfiltration structure 4 It can filter suspended matter such as cotton wool and hair, and can also increase the amount of sludge. 4. The first microfiltration structure 2 and the second microfiltration structure 4 do not need to build a large-area sedimentation tank, which can save a lot of land and construction costs. 5. The first microfiltration structure 2 and the second microfiltration structure 4 do not have the problem of stopping filtration during backwashing, and filtering and backwashing can be performed at the same time, which can not only increase the filtration efficiency, but also save a lot of management costs.

Fig. 6 shows a first modified embodiment of the first microfiltration structure of the present invention. Fig. 7 shows a first modified embodiment of the second microfiltration structure of the present invention. As shown in Figures 6-7, the first microfiltration structure 2a and/or the second microfiltration structure 4a can also further constitute a solid-liquid separation device (the structure can be roughly the same as that of the applicant of the present invention in Taiwan Patent Application No. 109112091 The solid-liquid separation device disclosed in No. 109204173 is the same), so as to increase the efficiency of the first microfiltration structure and the second microfiltration structure.

As shown in Figure 6, the first metal woven filter of the first microfiltration structure 2a The mesh 21a may be a flat filter membrane; the first circulating backwash structure 22a may further include: a base 223a on which the first metal woven filter mesh 21a is arranged; the first metal woven filter mesh 21a is in an inclined state , Having a high side 211a and a low side 212a; and a water supply assembly 224a, connected to the pre-treatment structure to receive the first treated water, and then supply the first treated water to the high side 211a of the first metal woven filter 21a , The first treated water flows along the high side 211a of the first metal woven filter 21a to the low side 212a, and is separated by solid and liquid to form the second treated water and the first sludge. The second treated water passes through the first The metal woven filter 21a, the first sludge is separated from the lower side 212a of the first metal woven filter 21a; and a first collection component 225a for collecting the second treatment through the first metal woven filter 21a Water; and a track 226a, which is set on the base 223a; and a first support structure 222a, which is a seat that can slide along the track 226a, and is connected to a power component (not shown); and a first The backwash jet structure 221a is arranged on the first support structure 222a and is located below the first metal woven filter screen 21a; the first backwash jet structure 221a has at least one jet directed toward the first metal woven filter screen 21a Holes (not shown in the figure) to allow the sprayed fluid to pass through the first metal woven filter screen 21a; and a baffle 227a, which is provided on the first support structure 222a and is located on the first metal woven filter screen 21a and above the first backwash jet structure 221a.

As shown in FIG. 7, the second metal woven filter 41a of the second microfiltration structure 4a may be a flat filter membrane; the second circulating backwash structure 42a may further include: a base 423a on which the second Two metal woven filters 41a; the second metal woven filter 41a is in an inclined state and has a high side 411a and a low side 412a; and a water supply component 424a, connected to the aerobic biological reaction structure to receive the third treated water, and then supply the third treated water to the high side 411a of the second metal woven filter 41a, the third treated water follows The high side 411a of the second metal woven filter 41a flows to the low side 412a, and is separated by solid and liquid to form the fourth treated water and the second sludge. The fourth treated water passes through the second metal woven filter 41a, and the second The sludge is separated from the lower side 412a of the second metal woven filter 41a; and a first collection component 425a for collecting the fourth treated water passing through the second metal woven filter 41a; and a track 426a, provided On the base 423a; and a second support structure 422a, which is a seat that can slide along the rail 426a, and is connected to a power component (not shown in the figure); and a second backwash jet structure 421a, located at The second support structure 422a is located below the second metal woven filter screen 41a; the second backwash jet structure 421a has at least one jet hole (not shown) facing the second metal woven filter screen 41a, The sprayed fluid can pass through the second metal woven filter 41a; and a baffle 427a, which is arranged on the second support structure 422a, and is located on the second metal woven filter 41a and the second backwash jet structure Above 421a.

Fig. 8 shows a second modified embodiment of the first microfiltration structure of the present invention. Fig. 9 shows a second modified embodiment of the second microfiltration structure of the present invention. As shown in Figures 8-9, the first microfiltration structure 2b and/or the second microfiltration structure 4b can also further form a filter structure (the structure of which is roughly comparable to that of the applicant of the present invention in Taiwan Patent Application No. 109123504, 109208852 The disclosed filter structure and its application are the same), so as to increase the efficacy of the first microfiltration structure and the second microfiltration structure.

As shown in FIG. 8, the first metal woven filter 21b of the first microfiltration structure 2b may be tubular, with a first end 213b, a second end 214b, and a first space 215b; the first microfiltration structure 2b The first circulating backwash structure 22b may further include: a first closing plate 228b, which is provided at the first end 213b of the first metal woven filter screen 21b, and has a first opening 2281b; and a second closing plate 229b, which is provided with At the second end 214b of the first metal woven filter 21b; and a first support structure 222b, which is a tube body, having a first end 2221b and a second end 2222b, the first end 2221b of the first support structure 222b Rotatable pivotally arranged on the first closing plate 228b; and at least one first backwash spray structure 221b, which is composed of a first communication pipe 2212b and a first water spray pipe 2213b; the first communication pipe 2212b The first support structure 222b is connected with the first water spray pipe 2213b, and the first water spray pipe 2213b is arranged close to the first metal braided filter screen 21b; A first water outlet (not shown in the figure) of a metal braided filter screen 21b; and a backwash pump 230b having a first water inlet pipe 2301b and a first water outlet pipe 2302b, and the first water outlet pipe 2302b is connected to the first water outlet pipe 2301b. The support structure 222b is used for injecting pressurized water so that the pressurized water is sprayed from the first spray port of the first spray pipe 2213b; There is a storage space 2311b between a metal woven filter 21b. The storage space 2311b of the storage tank 231b is connected to the pretreatment structure to receive the first treated water, so that the first treated water is separated from solid and liquid to form the second treated water and The first sludge and the second treated water pass through the first metal woven filter 21b, and the first sludge settles at the bottom of the storage space 2311b of the storage tank 231b; and A water pipe 232b connected to the first opening 2281b of the first closing plate 228b and the outside of the storage tank 231b to discharge the second treated water; and a sewage pipe 233b connected to the bottom of the storage space 2311b of the storage tank 231b to discharge the first sludge.

As shown in FIG. 9, the second metal woven filter 41b of the second microfiltration structure 4b can be tubular, with a first end 413b, a second end 414b, and a first space 415b; the second microfiltration structure 4b The second circulating backwash structure 42b may further include: a first closing plate 428b, which is provided at the first end 413b of the second metal woven filter 41b, and has a first opening 4281b; and a second closing plate 429b, which is provided At the second end 414b of the second metal braided filter 41b; and a second support structure 422b, which is a tube body with a first end 4221b and a second end 4222b, the first end 4221b of the second support structure 422b Rotatable pivotally arranged on the first closing plate 428b; and at least one second backwash spray structure 421b, which is composed of a first communication pipe 4212b and a first water spray pipe 4213b; the first communication pipe 4212b The second support structure 422b is connected with the first water spray pipe 4213b, and the first water spray pipe 4213b is arranged close to the second metal woven filter 41b; The first water jets (not shown in the figure) of two metal braided filters 41b; and a backwash pump 430b having a first water inlet pipe 4301b and a first water outlet pipe 4302b, and the first water outlet pipe 4302b is connected to the second water outlet pipe 4302b. The support structure 422b is used for injecting pressurized water so that the pressurized water is sprayed from the first spray port of the first spray pipe 4213b; There is a storage space 4311b between the two metal woven filters 41b, and the storage space 4311b of the storage tank 431b is connected to the aerobic biological reactor. It should be structured to receive the third treated water so that the third treated water is separated from solid and liquid to form fourth treated water and second sludge. The fourth treated water passes through the second metal woven filter 41b, and the second sludge settles. At the bottom of the storage space 4311b of the storage tank 431b; and a water outlet pipe 432b that connects the first opening 4281b of the first closing plate 428b and the outside of the storage tank 431b to discharge the fourth treated water; and a sewage pipe 433b that communicates The bottom of the storage space 4311b of the storage tank 431b is used to discharge the second sludge.

The above are the embodiments of the present invention, which are provided for convenience of description only, and should not be used to limit the meaning of the present invention, that is to say, all the various design changes made in accordance with the scope of the listed patent applications should be included in the patent scope of the present invention. middle.

100: Sewage treatment plant

1: Pre-processing structure

11: Sewage source

2: The first microfiltration structure

3: Aerobic biological reaction structure

4: The second microfiltration structure

5: Mixed and concentrated structure

6: Anaerobic biological digestion structure

Claims (6)

A sewage treatment method, which includes the following steps: a1) The previous treatment structure treats sewage and produces the first treated water; a2) Filter the first treated water with a first microfiltration structure to produce second treated water and first sludge; the first microfiltration structure contains a first metal woven filter screen and a first circulating backwash structure; a3) Treat the second treated water with an aerobic biological reaction structure to produce third treated water; a4) Filter the third treated water with a second microfiltration structure to produce fourth treated water and second sludge; the second microfiltration structure contains a second metal woven filter screen and a second circulating backwash structure; a5) Treat the first sludge and the second sludge with a mixing and thickening structure to produce a third sludge; a6) Treat the third sludge with an anaerobic biological digestion structure to produce methane and the fourth sludge. A sewage treatment device, which includes: A pre-treatment structure, connected to a sewage source, can filter the sewage of the sewage source to produce the first treated water; A first microfiltration structure, connected to the pre-treatment structure to receive the first treated water, has a first metal woven filter screen and a first circulating backwash structure, which can filter the first treated water to produce second treated water And the first sludge; An aerobic biological reaction structure is connected to the first microfiltration structure to receive the second treated water, and the second treatment can be treated by an aerobic biological reaction Water to produce third treated water; A second microfiltration structure, connected to the aerobic biological reaction structure to receive the third treated water, has a second metal woven filter screen and a second circulating backwash structure, which can filter the third treated water to produce a fourth Treated water and second sludge; A mixing and thickening structure, connecting the first microfiltration structure and the second microfiltration structure to receive the first sludge and the second sludge, which can mix and thicken the first sludge and the second sludge to produce a third Sludge; and An anaerobic biological digestion structure is connected to the mixing and thickening structure to receive the third sludge, and the third sludge can be treated by anaerobic biological digestion to produce methane and fourth sludge. Such as the sewage treatment device of claim 2, wherein the first metal woven filter screen of the first microfiltration structure is a flat filter membrane; the first circulating backwash structure further includes: a base on which is provided There is the first metal woven filter screen, the first metal woven filter screen is in an inclined state and has a high side and a low side; The high side of the first metal woven filter screen supplies the first treated water. The first treated water flows along the high side of the first metal woven filter screen to the low side, and is separated by solid and liquid to form the second treated water and the first treated water. A sludge, the second treated water passes through the first metal woven filter, and the first sludge is separated from the lower side of the first metal woven filter; and a first collection component for collecting and passing through the The second treated water of the first metal braided filter; and a track arranged on the base; and a first supporting structure, which is a seat that can slide along the track, and is connected to a power Components; and a first backwash jet structure, provided on the first support structure, and located below the first metal woven filter screen, the first backwash jet structure has at least one facing the first metal woven filter screen Spray holes, which allow the sprayed fluid to pass through the first metal woven filter screen; and a baffle, arranged on the first support structure, and located above the first metal woven filter screen and the first backwash spray structure . Such as the sewage treatment device of claim 2, wherein the second metal woven filter screen of the second microfiltration structure is a flat filter membrane; the second circulating backwash structure may further include: a base on the base Provided with the second metal woven filter screen, the second metal woven filter screen is in an inclined state and has a high side and a low side; and a water supply component connected to the aerobic biological reaction structure to receive the third treated water, Furthermore, the third treated water is supplied to the high side of the second metal woven filter, and the third treated water flows along the high side of the second metal woven filter to the low side, and is separated by solid and liquid to form the fourth Treated water and second sludge, the fourth treated water passes through the second metal woven filter, and the second sludge is separated from the lower side of the second metal woven filter; and a first collection component for collecting The fourth treated water passing through the second metal woven filter screen; and a track, which is arranged on the base; and a second support structure, which is a seat that can slide along the track and is connected to a power component; and The second backwash spray structure is arranged on the second support structure and is located under the second metal woven filter; the second backwash spray structure has at least one spray hole facing the second metal woven filter, So that the sprayed fluid passes through the second metal braided filter; and a baffle is provided on the second supporting structure and is located on the second metal braided Above the woven filter screen and the second backwash jet structure. Such as the sewage treatment device of claim 2, wherein the first metal woven filter screen of the first microfiltration structure is tubular and has a first end, a second end and a first space; the first circulating backwash structure It may further include: a first closing plate disposed on the first end of the first metal woven filter screen and having a first opening; and a second closing plate disposed on the second end of the first metal woven filter screen End; and a first support structure, which is a tube body, has a first end and a second end, the first end of the first support structure is pivotally pivoted on the first closing plate; and at least one first The backwash spray structure is composed of a first communication pipe and a first water spray pipe. The first communication pipe communicates with the first support structure and the first water spray pipe, and the first water spray pipe is arranged close to At the first metal braided filter screen, the wall of the first water spray pipe has a plurality of first water spray ports facing the first metal braided filter screen; and a backwash pump with a first water inlet pipe and a first A water outlet pipe, the first water outlet pipe communicates with the first support structure to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank covered in the first metal braid Outside of the filter screen, there is a storage space between the first metal woven filter screen, and the storage space of the storage tank is connected to the pre-treatment structure to receive the first treated water so that the first treated water is separated from solid and liquid. The second treated water and the first sludge are formed, the second treated water passes through the first metal woven filter screen, and the first sludge settles at the bottom of the storage space of the storage tank; and an outlet pipe connected to the first sludge A first opening of the closing plate and the outside of the storage tank are used to discharge the second treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the first sludge. Such as the sewage treatment device of claim 2, wherein the second metal woven filter screen of the second microfiltration structure is tubular and has a first end, a second end and a first space; the second circulating backwash structure It may further include: a first closing plate disposed at the first end of the second metal woven filter screen and having a first opening; and a second closing plate disposed at the second end of the second metal woven filter screen ; And a second support structure, which is a tube body with a first end and a second end, the first end of the second support structure is pivotally pivoted on the first closing plate; and at least one second reverse The flushing and spraying structure is composed of a first connecting pipe and a first water spraying pipe; the first connecting pipe is connected to the second supporting structure and the first water spraying pipe, and the first water spraying pipe is arranged near the At the second metal braided filter; the wall of the first spray pipe has a number of first water spray ports facing the second metal braided filter; and a backwash pump with a first inlet pipe and a first outlet A water pipe, the first water outlet pipe is connected to the second support structure to inject pressurized water so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank covered on the second metal braided filter Outside of the net, there is a storage space between the second metal woven filter screen, and the storage space of the storage tank is connected to the aerobic biological reaction structure to receive the third treated water, so that the third treated water is separated from solid and liquid The fourth treated water and the second sludge are formed. The fourth treated water passes through the second metal woven filter screen, and the second sludge settles at the bottom of the storage space of the storage tank; and an outlet pipe connected to the The first opening of the first closing plate and the outside of the storage tank are used to discharge the fourth treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the second sludge.

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