CN103922527B - Integrated sewage water advanced treatment apparatus and technique thereof - Google Patents

Abstract

The invention relates to an integrated sewage advanced treatment device and its technology. A sludge return pipe is provided at the bottom of the sedimentation area of the device. One end of the sludge return pipe is connected to the flocculation area, and the other end is provided with a mud discharge pipe; The zones are arranged one above the other and adjacent to the settling zone. Sewage enters the mixing area through the water inlet pipe. After mixing, it enters the flocculation area through the first water hole. After flocculation, it enters the sedimentation area through the second water hole. After the grid, it enters the filter cloth filtration area. After filtration, the effluent enters the disinfection area through the sump and the bottom mesh. After disinfection, it passes through the third water hole and is discharged from the outlet pipe. The sludge part returns to the flocculation area through the sludge return pipe. , part of which is discharged through the mud discharge pipe. The technological process of the present invention is reasonable, the overall design of the device is compact, the occupied area is small, the water head loss is small and the dosing amount is small.

Description

Integrated sewage advanced treatment device and its process

technical field

The invention belongs to the field of sewage treatment and relates to a sewage treatment device, in particular to an integrated sewage advanced treatment device and a process thereof.

Background technique

With the continuous development of sewage treatment technology, the sewage after secondary biochemical treatment has basically met the discharge requirements, and only needs to carry out advanced treatment on some water quality indicators to meet the standard discharge or reuse. The selection of sewage advanced treatment process is very different due to the difference in treatment objectives and effluent water quality. In a broad sense, the scope includes denitrification and phosphorus removal, removal of suspended solids, removal of organic matter, and disinfection. In the selection of many advanced treatment processes, the "coagulation-sedimentation-filtration-disinfection" process combination is favored because of its stable operation and high removal efficiency. Especially for the removal of suspended solids and total phosphorus, it can achieve stable effluent standards.

For the advanced treatment of sewage treatment plants, there are often situations such as small reserved space and high water head requirements. This requires that the advanced treatment device must have the objective requirements of small footprint and low head loss, and at the same time reduce the amount of dosing and energy consumption as much as possible.

Contents of the invention

Technical problem to be solved: an object of the present invention is to provide an integrated sewage advanced treatment device, which solves the technical problems of saving floor space, reducing water head loss and reducing dosage.

Another object of the present invention is to provide an integrated sewage advanced treatment process with compact process and small water head loss.

Technical solution: the present invention achieves the above object through the following technical solutions.

The invention provides an integrated sewage advanced treatment device, including a mixing area, a flocculation area, a sedimentation area, a filter cloth filtration area and a disinfection area, wherein a water inlet pipe is provided on one side of the mixing area, and the mixing area is connected to the flocculation area through a first water hole The flocculation area is connected to the sedimentation area through the second water hole, and the upper part of the other side of the sedimentation area is provided with a water outlet weir, and a filter cloth filter area is provided under the water outlet weir, and a slot-type filter element is installed in the filter cloth filter area. There is a grid plate at the front end of the filter area, a sump at the back end of the filter cloth filter area, a mesh at the bottom of the sump, a disinfection area below the filter cloth filter area, and a vertical baffle inside the disinfection area. A third water passage hole is formed between the lower bottom surface of the disinfection zone, and an outlet pipe is provided in the middle of the disinfection zone. There is a mud discharge pipe; the filter cloth filter area is arranged above and below the disinfection area and adjacent to the sedimentation area.

The front end of the filter cloth filter area is provided with a grid plate, so as to intercept large particles such as floating mud that may be brought out of the sedimentation area, and avoid subsequent blockage of the filter cloth.

The grid gap of the grid plate is 1-2mm, and the material is stainless steel.

The back end of the filter cloth filter area is provided with a sump, and the bottom of the sump is provided with a mesh with an aperture of 3-6 mm. The sump is funnel-shaped and made of stainless steel plates.

The mixing zone, flocculation zone and sedimentation zone can be selected in various forms, and are not limited to one form. For example, the mixing zone can adopt tube mixing, partition mixing, water pump mixing or mechanical agitation mixing; the flocculation zone can adopt grid flocculation, folding plate flocculation or mechanical flocculation. The settling area can adopt the form of advection settling, inclined tube settling, inclined plate settling, radial flow settling or vertical flow settling.

The disinfection zone and the filter cloth filter zone are set up and down, and a disinfection device is arranged inside, and a submerged ultraviolet disinfection lamp tube is used for arrangement.

A slot-type filter element is set in the filter cloth filter area, and the slot-type filter element is composed of a stainless steel frame and a polyester fiber filter cloth. The thickness of the filter element is 40-60mm, and the length and width can be adjusted according to the size of the pool body. The backwashing of the polyester fiber filter cloth adopts an online reciprocating self-priming pump cleaning device, and the backwashing frequency is controlled by two parameters of liquid level and time. When backwashing, the suction cups of the reciprocating self-priming pumps on both sides of the guide rail are fitted with the same width as the surface of the filter cloth, and then reciprocating cleaning is performed, and one back and forth is counted. The operating conditions are set separately. The waste water produced by backwashing is discharged by the self-priming pump, and can be directly discharged into the sewer or returned to the front end to mix with raw water according to the demand.

The backwashing of the filter cloth adopts an online reciprocating self-priming pump cleaning device, and the backwashing frequency is controlled by two parameters of liquid level and time.

The operating parameters of the integrated sewage advanced treatment device are:

1) Sludge return ratio in the sedimentation area: 1% to 4%;

2) Liquid level load in the sedimentation zone: 15~20m ³ /(m ² ·h);

3) Filtration speed of filter cloth: 6~12m/h;

4) The selection of other parameters depends on comprehensive consideration of water quality and pool type.

The integrated sewage advanced treatment process is as follows: sewage enters the mixing area through the water inlet pipe, enters the flocculation area through the first water hole after mixing, and enters the sedimentation area through the second water hole after flocculation. After the muddy water is precipitated and separated in the sedimentation area, the supernatant The liquid overflows from the outlet weir and enters the filter cloth filter area after passing through the grid plate. After filtering, the outlet water enters the disinfection area through the bottom mesh through the sump. After disinfection, it passes through the third water hole and is discharged from the outlet pipe. The sludge part is passed through The sludge return pipe returns to the flocculation area, and part of it is discharged through the sludge discharge pipe.

Beneficial effect:

Advantage and effect of the present invention are:

1) Integrated structure: The integrated structure is adopted to arrange and organically combine the mixing area, flocculation area, sedimentation area, filter cloth filtration area and disinfection area according to the direction of water flow, saving the floor area of the device; the filter cloth filtration area The water outlet uses a water collection tank instead of a pipe outlet, which can effectively reduce the thickness of the filter element, thereby reducing the volume of the filter tank;

2) Small water head loss: The coagulation-sedimentation-filtration-disinfection process is organically combined according to the process, and each area is connected by water holes or outlet weirs, and the structure is more compact. The filter cloth filtration area and the disinfection area are arranged up and down together, structurally replacing the engineering measures required due to the height difference between the sedimentation area and the filter cloth filtration area, such as the semi-buried setting of the sedimentation area, etc. The integrated device not only saves the floor area, but also can make full use of its own water level difference, and the total head loss is only 0.7-0.9m;

3) Sludge reflux setting: By setting sludge reflux, part of the incompletely reacted flocculant can be subjected to a secondary reaction, which can effectively maintain a higher sludge concentration required for flocculation, making it easier for flocs to produce condensation nuclei. Increase the self-weight of the flocs, which is beneficial to the subsequent sedimentation and separation, and improves the removal efficiency. Compared with the traditional coagulation-sedimentation process, it can effectively save the dosage of 10% to 30%;

4) Improve the stability of the system: the grid plate can effectively intercept the floating sludge impurities in the sedimentation area and stabilize the filter cloth filtration cycle; the mesh can reduce the impact of the water flow on the disinfection area and play a role in uniform water distribution; the baffle plate The setting can form an effective water seal, so that the ultraviolet lamp can be completely submerged to ensure the contact time and effect of disinfection;

5) Guaranteed effluent water quality: "coagulation-sedimentation-filtration-disinfection" is considered in the process, which can well guarantee the effluent water quality, especially the removal of suspended solids and phosphorus. At the same time, the physical filtration of the filter cloth can further remove 5% to 15% of organic matter and nitrogen.

Description of drawings

Fig. 1 is the structural representation of integrated sewage advanced treatment device of the present invention;

Fig. 2 is a process flow chart of the integrated sewage advanced treatment device of the present invention.

Among them, 1-mixing area; 2-flocculation area; 3-sedimentation area; 4-filter cloth filter area; 5-disinfection area; 6-inlet pipe; 7-outlet pipe; 8-sludge discharge pipe; 9-sludge return Tube; 10-grid plate; 11-slot filter element; 12-ultraviolet disinfection lamp; 13-sink; 14-mesh; 15-reciprocating self-priming pump; 161-first water hole; The second water hole; 163-the third water hole; 17-baffle plate; 18-water outlet weir; 19-guide rail.

Detailed ways

The following examples can enable those skilled in the art to understand the present invention more fully, but do not limit the present invention in any way.

Example 1

An integrated sewage advanced treatment device, as shown in Figure 1, the device includes a mixing zone 1, a flocculation zone 2, a sedimentation zone 3, a filter cloth filtration zone 4 and a disinfection zone 5, wherein a water inlet pipe 6 is provided on one side of the mixing zone 1 , the mixing zone 1 communicates with the flocculation zone 2 through the first water hole 161, and the flocculation zone 2 communicates with the sedimentation zone 3 through the second water hole 162, and the upper part of the other side of the sedimentation zone 3 is provided with an outlet weir 18, and the outlet weir 18 below is provided with filter cloth filtering area 4, and slot type filter core 11 is arranged in the filter cloth filtering area 4, and the front end of filter cloth filtering area 4 is provided with grille plate 10, and the rear end of filter cloth filtering area 4 is provided with sump 13, collects A mesh 14 is provided at the bottom of the water tank 13, a disinfection zone 5 is provided below the filter cloth filter zone 4, a vertical baffle 17 is arranged inside the disinfection zone 5, and a third water hole is formed between the baffle 17 and the bottom surface of the disinfection zone 5 163, the central part of the disinfection zone 5 is provided with an outlet pipe 7, the bottom of the sedimentation zone 3 is provided with a sludge return pipe 9, one end of the sludge return pipe 9 is connected to the flocculation zone 2, and the other end is provided with a sludge discharge pipe 8; Zone 4 and disinfection zone 5 are arranged one above the other and adjacent to precipitation zone 3 .

A slot-type filter element 11 composed of stainless steel frame and polyester fiber filter cloth is installed in the filter cloth filter area 4, and a reciprocating self-priming pump 15 cleaning device is used for backwashing, and the liquid level and time are set to be controlled by dual parameters. During backwashing, the suction cups of the reciprocating self-priming pump 15 on both sides of the guide rail 19 are fitted with the same width as the surface of the filter cloth, and then reciprocating cleaning is carried out, one trip counts once, and two times during cleaning. The waste water produced by backwashing is discharged by the self-priming pump, and can be directly discharged into the sewer or returned to the front end to mix with raw water according to the demand.

Disinfection zone 5 and filter cloth filter zone 4 adopt upper and lower co-constructed arrangement, internally set disinfection device, adopt submerged ultraviolet disinfection lamp tube 12 to arrange.

Sewage enters the mixing zone 1 through the water inlet pipe 6. After mixing, it enters the flocculation zone 2 through the first water hole 161. After flocculation, it enters the sedimentation zone 3 through the second water hole 162. After the muddy water is precipitated and separated in the sedimentation zone 3, the supernatant The overflow from the outlet weir 18 passes through the grid plate 10 and enters the filter cloth filtration area 4. After filtration, the outlet water enters the disinfection area 5 through the sump 13 and the bottom mesh 14. After disinfection, it passes through the third water hole 163 and then flows out of the outlet pipe. 7 is discharged, and part of the sludge is returned to the flocculation zone 2 through the sludge return pipe 9, and part of it is discharged through the sludge discharge pipe 8.

The function of each functional area and main components will be described in detail below.

1) Mixing area: Mixing is one of the most important links in flocculation, and its main function is to complete the full mixing of chemicals and water. The hydrolyzate of the coagulant is quickly mixed into every detail of the water body, and destabilizes the colloidal particles in the water. At the same time, coagulation is the prerequisite for achieving a good flocculation effect, and it is also the key to saving the dosage. The essence of the mixing problem is the diffusion of the hydrolyzate of the mixture in water. There are many forms that can be used in this zone, such as tube mixing, partition mixing, water pump mixing and mechanical stirring mixing.

2) Flocculation zone: the main function is to make the flocculant react with suspended particles in water to form stable micelles. Raw water and flocculant are fully mixed in the mixing zone and then enter the flocculation zone. In the flocculation zone, destabilized impurities and sludge particles collide and coagulate to achieve better flocculation effect, forming heavy and large flocs. The flocculation growth process is a process in which tiny particles contact and collide. The quality of the flocculation effect depends on the connection ability of the polymer complex produced after the hydrolysis of the coagulant to form an adsorption bridge on the one hand, and on the other hand depends on the probability of contact and collision of tiny particles and how to control them for reasonable and effective collision. That is to say, it depends on the type of coagulant and dynamic conditions. There are various forms that can be used in this area, such as mesh flocculation, folded plate flocculation, mechanical flocculation and so on.

3) Sedimentation area: The mud and water are separated here. There is a mud discharge pipe at the bottom to discharge mud regularly, and a sludge return pipe to return the concentrated sludge to the flocculation area. There are many forms that can be used in this area, such as advection sedimentation, inclined tube (plate) sedimentation, radial flow sedimentation and vertical flow sedimentation.

4) Filter cloth filtration area: This area is next to the outlet weir of the sedimentation area, making full use of the water level difference to filter the filter cloth, which can further remove suspended solids in the water, and can also further remove certain organic matter and nitrogen and phosphorus through the filtering effect of the filter cloth .

5) Disinfection area: This area and the filter cloth filter area are jointly built up and down to make full use of the water level difference and reduce the occupied area. After being sterilized by ultraviolet disinfection lamps, it is discharged from the outlet pipe.

6) Sludge return pipe: The purpose of sludge return is to maintain a higher sludge concentration required for flocculation, so that the flocs can more easily produce condensation nuclei and increase the weight of the flocs, which is conducive to subsequent sedimentation and separation. In addition, some incompletely reacted flocculants are carried in the return sludge, which can also undergo secondary reactions in the flocculation zone, thus saving the amount of dosing.

8) Grid plate: the main function is to intercept large particles such as floating mud that may be brought out of the sedimentation area, so as to avoid the blockage of the subsequent filter cloth. In this embodiment, the grid gap of the grid plate is 1 mm, and the material is stainless steel;

9) Water collection tank: The functional water collection tank replaces the pipe outlet, which can effectively reduce the thickness of the filter element. Restricted by the requirement of the outlet water flow rate on the diameter of the outlet pipe, the thickness of the filter element for filter cloth filtration is generally 80-100mm. However, after the water collection tank is used in the present invention, water can be discharged from the bottom of the entire filter element, so it is not limited by the amount of water. The thickness of the filter element in the cloth filter area can be 40-60mm, thus reducing the volume of the filter tank;

10) Mesh: Usually relatively dense, the main function is to distribute water evenly and slow down the impact on the disinfection area. In this embodiment, the water collection tank is funnel-shaped, made of spliced stainless steel plates, and the bottom of the tank is a mesh 14 with a diameter of 5 mm.

The device adopts an integrated structure, and the mixing area, flocculation area, sedimentation area, filter cloth filtration area and disinfection area are arranged in an orderly manner according to the direction of water flow and organically combined. Each area is connected by a water hole or an outlet weir, and the structure is more compact. The filter cloth filtration area and the disinfection area are arranged up and down together, structurally replacing the engineering measures required due to the height difference between the sedimentation area and the filter cloth filtration area, such as the semi-buried setting of the sedimentation area, etc. The integrated device not only saves floor area, but also can make full use of its own water level difference, and the water head loss is significantly reduced, usually 0.7-0.9m.

The usual flocculation method does not use sludge return, and only relies on the optimization of its own tank body to improve the flocculation efficiency. There is sludge backflow in the high-density clarifier, but it is limited to the mechanical flocculation-inclined tube (plate) sedimentation method, and the present invention broadens the selection of the flocculation-sedimentation method.

The grid plate can effectively intercept the floating sludge impurities in the sedimentation area and stabilize the filter cycle of the filter cloth; the sump instead of the pipe outlet can effectively reduce the thickness of the filter element, thereby reducing the volume of the filter tank; the mesh can reduce the impact of water flow on the disinfection area The impact can play the role of uniform water distribution; the setting of the baffle can form an effective water seal to ensure the complete immersion of the ultraviolet lamp.

By setting the sludge backflow, part of the incompletely reacted flocculant can be subjected to a secondary reaction, which can effectively maintain a higher sludge concentration required for flocculation, making it easier for the flocs to produce condensation nuclei and increase the weight of the flocs, thereby It is beneficial to the subsequent precipitation separation and improves the removal efficiency. Compared with the traditional coagulation-sedimentation process, it can effectively save the dosage of 10% to 30%.

In this example, the secondary sedimentation effluent of a sewage treatment plant in eastern Zhejiang is taken as the research object, and the method of the present invention is tested and verified and implemented. The advanced treatment process of proportional sewage plant "mesh flocculation-incline tube sedimentation-filter cloth filter" process was compared simultaneously. See Table 1 for influent and effluent water quality.

Table 1 Test influent and effluent water quality

It can be seen from the above table that the concentration of suspended solids (SS) and total phosphorus (TP) of the examples of the present invention are lower than those of the comparative examples. Moreover, through the sludge reflux, part of the incompletely reacted flocculant can be subjected to a secondary reaction. Compared with the traditional coagulation-sedimentation process, the addition of flocculant is saved, and the dosage is saved by 25%.

It can also be seen from the above table that in the comparative example, there is sludge adhered to the filter cloth, and the backwash cycle is unstable, while in the embodiment of the present invention, there are obvious impurity particles intercepted by the grid plate, the filter backwash cycle is stable, and the effluent water quality is stable. Assure.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. integrated sewage water advanced treatment apparatus, it is characterized in that: comprise mixing zone, flocculation zone, settling region, filter-cloth filtering district and sterilizating area, wherein side, mixing zone is provided with water inlet pipe, mixing zone is connected with flocculation zone via the first water hole, flocculation zone is connected with settling region via the second water hole, opposite side top, settling region is provided with effluent weir, filter-cloth filtering district is provided with below effluent weir, insertion slot type filter core is set in filter-cloth filtering district, front end, filter-cloth filtering district is provided with flase floor, rear end, filter-cloth filtering district is provided with water leg, mesh is provided with bottom water leg, filter-cloth filtering is provided with sterilizating area below district, sterilizating area inside is provided with vertical baffle, the 3rd water hole is formed between baffle plate and sterilizating area bottom surface, rising pipe is provided with in the middle part of sterilizating area, mud return line is provided with bottom described settling region, mud return line one end is connected with flocculation zone, the other end is provided with shore pipe, described filter-cloth filtering district and described sterilizating area are arranged and adjacent with described settling region up and down.

2. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: the grid gap of described flase floor is 1 ~ 2mm.

3. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: the aperture of described mesh is 3 ~ 6mm.

4. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: described insertion slot type filter core is made up of stainless steel frame and trevira filter cloth.

5. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: the thickness of described insertion slot type filter core is 40 ~ 60mm.

6. integrated sewage water advanced treatment apparatus as claimed in claim 4, is characterized in that: the back flushing of described trevira filter cloth adopts online reciprocating self-priming pump washing unit, and back flushing frequency adopts liquid level and time two-parameter control.

7. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: arrange sterilizing unit in described sterilizating area.

8. integrated sewage water advanced treatment apparatus as claimed in claim 7, is characterized in that: described sterilizing unit is ultraviolet disinfecting tube.

9. integrated sewage water advanced treatment apparatus as claimed in claim 1, is characterized in that: settling region return sludge ratio: 0.01 ~ 0.04, settling region liquid level load 15 ~ 20m ³/ (m ²h); The filtering velocity of filter-cloth filtering: 6 ~ 12m/h.

10. one kind uses the treatment process of integrated sewage water advanced treatment apparatus as claimed in claim 1, it is characterized in that: sewage enters mixing zone through water inlet pipe, flocculation zone is entered through the first water hole after mixing, settling region is entered through the second water hole after flocculation, muddy water is after settling region precipitate and separate, supernatant liquor enters filter-cloth filtering district by effluent weir overflow after flase floor, after filtration, water outlet enters sterilizating area through water leg by bottom mesh, discharged by rising pipe after the 3rd water hole after sterilization, sludge part is back to flocculation zone through mud return line, part is discharged through shore pipe.