CN114716059A

CN114716059A - Modularized capacity-expanding and standard-extracting transformation method for water purification plant adopting advection pool process

Info

Publication number: CN114716059A
Application number: CN202210342903.2A
Authority: CN
Inventors: 毛士廉; 吴鹏鹏; 张宁东
Original assignee: Shandong Hotone Environment Technology Co ltd
Current assignee: Shandong Hotone Environment Technology Co ltd
Priority date: 2022-01-26
Filing date: 2022-03-31
Publication date: 2022-07-08

Abstract

The invention relates to a modular capacity-expanding and standard-upgrading transformation method for a water purification plant adopting an advection pool process, which comprises the following steps: dividing the advection pool into a first modification area and a second modification area along the extension direction of the advection pool, wherein the first modification area is communicated with a primary flocculation area positioned at the upstream of the advection pool; arranging a plurality of sedimentation modules in the first modification area in sequence along the extension direction of the advection pool to ensure that the sedimentation modules have a sedimentation treatment scale at least matched with the primary flocculation area, wherein each sedimentation module comprises a shell and a sedimentation device accommodated in the shell; and arranging a water treatment module with a non-precipitation function in the second modification area, or arranging an adjacent new flocculation area and a plurality of precipitation modules with precipitation treatment scales at least matched with the new flocculation area in the second modification area. Because the sedimentation efficiency of the sedimentation module is far higher than that of the original advection pool, the redundant space after the original advection pool is transformed can be used for arranging more sedimentation modules or other functional modules, and the capacity of the water plant or the quality of the effluent water can be greatly improved under the condition that the areas of the water plant are the same.

Description

Modularized capacity-expanding and standard-extracting transformation method for water purification plant adopting advection pool process

Technical Field

The disclosure relates to the field of water purification, in particular to a modular capacity expansion and upgrading transformation method for a water purification plant adopting an advection pool process.

Background

In the process of purifying raw water in a water purification plant, steps of flocculation, precipitation, filtration and the like are generally required, and the precipitation is mainly divided into a horizontal flow type and a vertical flow type. At present, the horizontal flow sedimentation tank of a water treatment plant is generally rectangular, a flocculation tank is arranged at the upstream of the horizontal flow sedimentation tank, raw water flows in from one end of the horizontal flow sedimentation tank, flows through the horizontal direction of the horizontal flow sedimentation tank and flows out from the other end of the horizontal flow sedimentation tank. The bottom of the inlet of the pond is provided with a mud storage hopper, the bottom of the pond at other parts has a slope and tends to the mud storage hopper, but the sedimentation efficiency of horizontal sedimentation is low, the corresponding sedimentation work can be completed by generally needing a large space, and the capacity cannot meet the requirement under the condition of limited field; on the other hand, some old water plants adopting the horizontal sedimentation tank cannot meet the current national standard requirements due to the early construction time, and cannot increase the standard extraction process under the condition of limited sites, so that the water quality cannot meet the requirements.

The Chinese patent application numbers are: 202111583428.X discloses a settling plate, a settling module and a water purification system for horizontal settling of lateral flow, the settling module can greatly improve settling efficiency and reduce the space required by the settling process, and the settling module is applied to a newly-built water purification plant.

Disclosure of Invention

The present disclosure is directed to a modular capacity expansion upgrading method for water treatment plants using advection pool process, so as to at least partially solve the problems of the related art.

In order to achieve the above object, the present disclosure provides a method for modular capacity expansion and upgrading reconstruction of a water treatment plant using a advection pool process, the method comprising: dividing the advection pool into a first reconstruction area and a second reconstruction area along the extension direction of the advection pool, wherein the first reconstruction area is communicated with a primary flocculation area positioned at the upstream of the advection pool; arranging a plurality of sedimentation modules in sequence in the first modification area along the extension direction of the advection pool, so that the first modification area has a sedimentation treatment scale at least matched with the primary flocculation area, wherein each sedimentation module comprises a shell and a sedimentation device accommodated in the shell; and arranging a water treatment module with a non-settling function in the second modification area, or arranging a new flocculation area adjacent to the second modification area and a plurality of settling modules with settling treatment scales at least matched with the new flocculation area in the second modification area.

Optionally, the water treatment module comprises an ozone activated carbon adsorption tank, or an air flotation module, or a manganese sand filtration module, or an ultrafiltration module, or a reverse osmosis module, or an arsenic removal module, wherein the ozone activated carbon adsorption tank comprises an ozone contact zone and an activated carbon filter, and preferably, the step of arranging the second reforming zone as an ozone activated carbon adsorption tank comprises: a plurality of inclined plates which form included angles with the bottom of the advection pool are sequentially arranged in the ozone contact zone from bottom to top at intervals, and two adjacent inclined plates are respectively fixedly connected with different side walls on two sides of the advection pool and are arranged at intervals with opposite side walls; arranging a top plate of the ozone contact zone into an inclined shape with an included angle with the bottom of the advection pool, and arranging an ozone reflux device at the higher end of the top plate; and arranging a waste carbon collecting device in the activated carbon filter to collect activated carbon particles carried by activated carbon backwashing water.

Optionally, when arranging an adjacent new flocculation zone and a plurality of sedimentation modules having a sedimentation treatment size at least matching the new flocculation zone in the second retrofit zone, the method further comprises: arranging a filtration zone in the first retrofit zone, the filtration zone being downstream of the plurality of precipitation modules and having a filtration process scale at least matching the preflocculation zone upstream thereof, preferably the step of arranging a filtration zone in the first retrofit zone comprises: a water outlet pipe, a back flushing pipe and a water discharge pipe of the filtering area are arranged between the water outlet end of the filtering area and the pool wall close to the water outlet end; a steel bracket or a concrete buttress is arranged at the bottom of the filtering area and is used for supporting the water outlet pipe, the back flushing pipe and the water discharge pipe; a plurality of through holes are formed in the wall of the pool, and the water outlet pipe, the backflushing pipe and the water discharge pipe respectively penetrate through the corresponding through holes; and sealing and waterproofing the gaps among the through holes, the water outlet pipe, the back flushing pipe and the water outlet pipe.

Optionally, prior to the step of sequentially arranging the plurality of sedimentation modules in the advection basin, the method further comprises: and removing the sedimentation structure in the advection pond, so that the removed pond body has a flat pond bottom and a flat pond wall, wherein the pond wall comprises a first end wall close to the flocculation zone, a second end wall opposite to the first end wall in the extending direction of the advection pond, and two side walls connected between the first end wall and the second end wall, and the first end wall is provided with water distribution holes.

Optionally, after the step of dismantling the construction for sedimentation inside the advection pool and before the step of arranging the plurality of sedimentation modules in sequence in the advection pool, the method further comprises: filling or shaving the mud collecting ditch flat according to the structure of the original mud collecting ditch of the advection pool; and a connecting piece is embedded in the bottom of the advection pool and is used for being fixedly connected with the precipitation module.

Optionally, the first reclamation area communicates with the primary flocculation area through a water distribution hole of the primary flocculation area, the plurality of sedimentation modules divide the first reclamation area into a water inlet side and a water discharge side in the first reclamation area, the water distribution hole being located on the water inlet side, the method further comprising: on the water inlet side, a water inlet channel is established between the water distribution hole and the water inlet of the precipitation module; on the drainage side, a drainage channel is established in communication with the drainage port of the precipitation module.

Optionally, the step of establishing the water inlet channel comprises: attaching and fixing one precipitation module to the first end wall, or fixing one precipitation module at a position close to the first end wall at intervals, and respectively arranging baffle plates at positions of two side surfaces of the precipitation module, which are close to the first end wall, wherein the baffle plates are hermetically attached to the side surfaces, the pool bottom and the pool wall and are flush with the precipitation module in height; sequentially connecting and arranging other precipitation modules along the extension direction of the advection pool, and attaching and sealing the adjacent precipitation modules to form a water distribution channel on the water inlet side; and providing an adjustable weir for controlling flow into the settling module proximate the water inlet of the distribution channel, wherein preferably the step of establishing the water inlet channel after the distribution channel is formed on the water inlet side further comprises: arranging a steel bracket or a concrete buttress at the bottom of the water distribution channel; arranging a distribution canal above the steel support or the concrete buttress, wherein the bottom surface of the distribution canal is configured to be inclined with an angle with the bottom of the advection pool, and the bottom surface and one side surface of the distribution canal form a V-shaped mud collecting groove, and preferably, the method further comprises the following steps: a mud collecting hopper is arranged at the end part of the water inlet channel, and a valve is arranged below the mud collecting hopper and connected with a mud discharging pipeline; a driving type mud scraper is arranged at the top of the water inlet channel, a mud level detector is arranged in the mud collecting groove, and the mud level detector is connected with the mud scraper; and connecting the sludge discharge pipeline to an original sludge discharge pipe of the advection pool, wherein preferably, the step of attaching and fixing one of the precipitation modules to the first end wall comprises: fixedly connecting and fixing the side edge of the sedimentation module extending along the extension direction of the advection pool on the first end wall through angle steel; coating waterproof paint on the angle steel and the joint of the angle steel, and performing waterproof treatment on the outer side of the waterproof paint by using waterproof mortar; and pouring a plugging material into a gap between the precipitation module and the first end wall, and wherein preferably the step of arranging a plurality of other precipitation modules in series comprises: fixedly connecting the adjacent surfaces of two adjacent precipitation modules; and after the fixed connection is finished, performing waterproof treatment on the connection gap.

Optionally, the step of establishing the water inlet channel comprises: leading out a water inlet main pipe from the water distribution holes; the water inlet main pipe is connected to the water inlets of the plurality of sedimentation modules in a bypassing manner through a water inlet branch pipe; installing a regulating valve in the water inlet pipe, wherein preferably, before the step of leading the water inlet main pipe out of the water distribution hole, the method further comprises the following steps: double-layer reinforcing steel bars are woven in the water distribution holes and fixedly connected with the original reinforcing steel bars of the tank body; a waterproof flexible sleeve is arranged in a gap of the double-layer steel bar and used for installing the water inlet main pipe; supporting a formwork on two sides of the water distribution hole and pouring concrete; and coating a silica gel waterproof layer on the junction of the newly poured concrete and the original pool wall and the surface of the newly poured concrete.

Optionally, the method comprises: before the water inlet channel is established, the water distribution holes are partially plugged, preferably, the step of partially plugging the water distribution holes comprises: the inner wall of the water distribution hole is provided with a mounting hole; implanting embedded bars into the mounting holes; and (5) supporting the formwork of the mounting hole implanted with the embedded steel bar and pouring concrete.

Optionally, the step of removing the settling structure inside the advection pool comprises: cutting off the original sludge discharge pipe of the advection pool at the position close to the pool wall, wherein the method also comprises the following steps: fixedly connecting a first flange on the section of the sludge discharge pipe; the sludge discharge ports of the sedimentation modules are communicated, and the communicated pipelines extend to the first flange and are fixedly connected with the second flange; and connecting the first flange and the second flange.

Through above-mentioned technical scheme, because the precipitation efficiency of deposiing the module is far higher than former advection pond, so can save the space in former advection pond under the same condition of productivity demand, unnecessary space can be used for arranging more sediment modules or other functional modules after former advection pond transformation, can promote water plant productivity or play water quality of water greatly under the same condition of water plant area.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a raw water plant section module provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic illustration of a raw water treatment plant after demolition of a precipitation structure provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic view of a conventional water treatment plant with a settling structure removed and a stationary base installed according to an exemplary embodiment of the present disclosure;

4-5 are schematic diagrams of partial plugging of water distribution holes provided according to exemplary embodiments of the present disclosure;

6-7 are schematic views of a mounting fixture base provided in accordance with exemplary embodiments of the present disclosure;

8-9 are schematic diagrams of a retrofitted water plant provided in accordance with exemplary embodiments of the present disclosure;

10-11 are schematic diagrams of establishing advection pool dividing walls provided in accordance with exemplary embodiments of the present disclosure;

12-13 are schematic views of installing pre-buried steel plates provided according to exemplary embodiments of the present disclosure;

FIG. 14 is a schematic illustration of a water intake channel after deployment provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 15 is a schematic view of an installation waterproof flexible boot provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 16 is a schematic view of a precipitation module and first end wall connection provided in accordance with an exemplary embodiment of the present disclosure;

figure 17 is a cross-sectional view of an ozone contact zone provided in accordance with an exemplary embodiment of the present disclosure.

Description of the reference numerals

10 flocculation zone 20 water distribution holes

21 mounting hole 22 planting bar

23-support plate 24 double-layer steel bar

30 base 31 embedded steel plate

41 water inlet side and 42 water outlet side

50 advection pond 60 deposits module

70 waterproof flexible sleeve 80 dividing wall

100 water delivery and distribution channels of 90 mud scraper

110 inclined plate 120 top plate

130 ozone reflux device

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of the directional terms "top, bottom", "inner" and "outer" should be understood based on the application environment of the relevant component, which may be defined based on the actual use direction of the relevant component or based on the profile of the component itself. For example: the advection pool is in a groove-shaped structure with an opening at the top, which means that the advection pool is in a groove-shaped structure with an open end surface far away from the ground; the structure for sedimentation is arranged in the 'inner part' of the horizontal flow pool, and the structure for sedimentation is arranged in the containing space in the groove of the horizontal flow pool.

In addition, in the present disclosure, the terms "first", "second", and the like are used for distinguishing one element from another, without order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

First, it should be noted that the sedimentation module 60 refers to a sedimentation plate for sedimentation, etc. integrated into a housing, which is provided with a water inlet, a water outlet and a sludge outlet, raw water flows in from the water inlet, and flows out from the water outlet after sedimentation, and the sedimentation module 60 may be constructed in any suitable configuration on the market, and the principle thereof is well known to those skilled in the art, and will not be explained herein.

In addition, the fixing and connecting method between the components described below may refer to welding, bolting, riveting, or bonding, and may be adaptively selected according to specific implementation scenarios and situations, and the disclosure is not limited thereto as long as the connecting method can meet the required standards such as fixing strength or sealing standard.

Referring to fig. 3, the present disclosure provides a modular capacity expansion and upgrading method for a water treatment plant using a advection pool process, the method comprising: dividing the advection pool 50 into a first modification area and a second modification area along the extension direction of the advection pool, wherein the first modification area is communicated with a primary flocculation area 10 positioned at the upstream of the advection pool 50; arranging a plurality of sedimentation modules 60 in sequence in a first reclamation area along the extension direction of the advection pool 50, so that the first reclamation area has a sedimentation treatment scale at least matched with that of the primary flocculation area 10, wherein each sedimentation module 60 comprises a shell and a sedimentation device accommodated in the shell; and arranging a water treatment module with a non-precipitation function in the second modification area, or arranging an adjacent new flocculation area and a plurality of precipitation modules with precipitation treatment scales at least matched with the new flocculation area in the second modification area. It should be noted here that the advection pond 50 before modification is equivalent to the treatment scale of the primary flocculation zone, the precipitation treatment scale of the first modification zone mentioned above is determined by the self-treatment capacity of the precipitation module, while the modular precipitation apparatus has a precipitation capacity stronger than that of the original open advection pond, as described in the application document with the application number of 202111583428.X, for example, the modular precipitation apparatus 60 has a treatment capacity far better than that of the primary advection pond 50, and the specific treatment scale depends on the structure of the internal precipitation plates and the like, which is not described herein too much. Similarly, a modular filtration module or other module also has greater processing power than a non-modular product due to its internal processing structure.

Referring to fig. 10 to 11, in the present embodiment, when the advection pool 50 is partitioned, the partition wall 80 may be poured into the advection pool 50, the partition wall 80 and the side wall of the advection pool 50 are fixed by angle steel, and waterproof glue, steel wire mesh, cement mortar and waterproof silica gel are applied to the outside of the angle steel to achieve the sealing and waterproofing of the joint.

It should be noted that, before the sedimentation module 60 is installed and fixed, connectors need to be embedded in the bottom of the tank, and the sedimentation module 60 needs to be arranged on the embedded connectors. In some embodiments, the embedded connector may be a steel base 30, and in other embodiments, the embedded connector may be an embedded steel plate 31, which is not limited by the present disclosure, and the embedded connectors in the two cases will be described in detail below.

Firstly, when the pre-buried connecting piece is a steel base 30, referring to fig. 6-7, specifically, before construction, impurity cleaning needs to be performed on the bottom plate of the advection sedimentation tank, algae and sludge on the tank wall are cleaned, clean water is adopted for washing and drying, then roughening treatment is performed on the construction area, ribs are planted on the bottom plate of the advection sedimentation tank, and the base 30 and the ribs leaked from the upper layer of the bottom plate are reliably and fixedly connected. After the base 30 is fixedly connected, concrete is poured at the bottom of the pool, the steel base 30 is completely covered, and only the top surface of the base 30 is left outside so as to be fixedly connected with the precipitation module 60. Before the precipitation module 60 is hoisted in place, the surface of the pre-buried base 30 is cleaned by derusting, after the precipitation module 60 is hoisted in place, the precipitation module 60 is fixedly connected with the pre-buried base 30, impurities at the connection position are cleaned, and anti-corrosion treatment is carried out. It should be noted that, in some embodiments, the length and the width of the base 30 need to be determined according to the scale and the width of the selected sedimentation module 60, and a construction distance of 1.5-2.0m may be reserved between the base 30 and the tank wall, and of course, according to the size of the original advection tank, the size of the sedimentation module 60, and the size of the target advection tank after modification, in other embodiments, 3m may be reserved between the base 30 and the tank wall, which is not limited by the present disclosure.

In addition, when the embedded connector is the embedded steel plate 31, referring to fig. 12-13, firstly, a bottom plate of the advection pool 50 needs to be supported and concrete is poured, steel plates need to be embedded at four corners of the supported mold before pouring, after the concrete is solidified and formed, the embedded steel plate 31 is fixed in the concrete, and it needs to be ensured that at least the top surface of the embedded steel plate 31 is exposed to be used for connecting the precipitation module 60.

Through above-mentioned technical scheme, during the use, because the sedimentation efficiency of deposiing module 60 is far higher than the advection pond that former only relies on silt dead weight to subside, so can save former advection pond's space under the same condition of productivity demand, unnecessary space after former advection pond is reformed transform can be used for arranging more sediment modules 60 or other functional modules, can promote water plant productivity or play water quality of water greatly under the same condition of water plant area.

Along with economic development and continuous improvement of the living standard of people, people put forward higher requirements on the quality of drinking water, but raw water is polluted by different degrees of life and production of people, wherein part of pollutants cannot be removed by adopting a conventional water purification treatment process, and part of old water plants have no redundant land to build an advanced treatment process. In order to solve the above problems, the water treatment module may include an ozone activated carbon adsorption tank, or an air flotation module, or a manganese sand filtration module, or an ultrafiltration module, or a reverse osmosis module, or an arsenic removal module, wherein the ozone activated carbon adsorption tank includes an ozone contact zone and an activated carbon filter. Of course, in some embodiments, the processing module may also be a combination of the above modules, or other functional modules capable of improving water quality, which is not limited in this disclosure.

Similarly to the configuration of the precipitation module 60 described above, the flotation module, manganese sand filtration module, ultrafiltration module, reverse osmosis module, and arsenic removal module each include a housing and a substance/structure disposed within the housing having a corresponding treatment function, with the modular structure having a higher treatment capacity than conventional non-modular products. The air flotation module is used for removing algae in water, the manganese sand filtering module is used for removing standard exceeding iron and manganese ions in the water, the ultrafiltration module is used for removing standard exceeding heavy metal ions and calcium and magnesium ions in the water, and the reverse osmosis module can be used for making direct drinking water.

The following detailed description will be given by taking the example of arranging the second modification area as an ozone activated carbon adsorption tank, and the modification specific steps are as follows: first, separate out a part space as ozone activated carbon adsorption pond in the second transformation district, concretely, refer to fig. 17, interval set up a plurality ofly in proper order from bottom to top in the ozone contact zone have the swash plate 110 of contained angle with the bottom of the pool of advection pond 50, in order to improve the absorption efficiency of water to ozone, two adjacent swash plates 110 respectively fixed connection advection pond 50 both sides different lateral walls and with relative lateral wall interval setting, in this embodiment, in order to increase the flow efficiency of ozone, the unsettled one end of swash plate 110 can be higher than its fixed connection's one end. In other embodiments, the floating end of the sloping plate 110 may be flush with the fixedly connected end, which is not limited by the present disclosure. In addition, the number of the inclined plates needs to be adaptively modified according to the actual field environment, for example, in the embodiment of the present disclosure, the number of the inclined plates may be eight. When the ozone generator is used, the ozone source is arranged at the bottom of the advection pool 50, and ozone rises in a snake-shaped path between the inclined plates from bottom to top, so that a water body can fully absorb the ozone.

Further, in order to recover and improve the utilization rate of the ozone flowing to the top of the ozone contact area, in the present embodiment, the top plate 120 of the ozone contact area is disposed to be inclined with an included angle with the bottom of the advection pool 50, and the higher end of the top plate 120 is disposed with the ozone backflow device 130. Due to the inclined design of the top plate 120 of the ozone contact area, the ozone flowing from bottom to top can be gathered at the highest position of the top plate 120 and collected by the ozone reflux device 130 to flow back to the ozone source at the bottom of the advection pool 50 for recycling.

In order to avoid that the back flushing water of the activated carbon filter flushes away the activated carbon particles, in the embodiment, a waste carbon collecting device can be arranged in the activated carbon filter to collect the activated carbon particles carried by the back flushing water of the activated carbon. The backwash water is water for washing the activated carbon with treated clean water.

Similarly, in order to reasonably utilize the space and increase the capacity of the water plant, the primary flocculation area 10 can only meet the requirements of using part of the sedimentation modules 60 and the concrete sedimentation tank, the advection tank 50 is long and narrow, the unused part is large, and the rest of the existing advection tank 50 can be used for realizing the scale of capacity expansion and transformation. For example, in some embodiments, the second modified zone is arranged with adjacent new flocculation zones and a plurality of sedimentation modules having a sedimentation treatment scale at least matching the new flocculation zones, at which time the portion of the second modified zone effluent is passed to the original filtration tank for filtration treatment.

In particular, with reference to figures 8-9, the second modified zone is modified to a flocculation basin and sedimentation module, in which case the flocculation basin may be of the same construction as the flocculation zone 10 upstream of the primary advection basin 50. The flocculation tank can be made of light materials, steel materials, concrete materials and the like. The lightweight material flocculation tank is a flocculation tank construction mode which adopts a steel material framework and utilizes lightweight materials as partition plates; the steel flocculation tank is a flocculation tank construction mode which adopts a steel framework and utilizes a metal plate as a partition plate. The concrete material flocculation tank is a mode of constructing the flocculation tank by adopting a concrete shear wall and utilizing reinforced concrete as a main material.

In addition, it should be further explained that the flocculation ponds constructed in the different manners are all constructed in the existing second reconstruction area, the pond walls on two sides of the original advection pond 50 are used as two side walls of the newly constructed flocculation pond, and the construction materials of the flocculation ponds such as light materials, steel materials, concrete materials and the like are used as the other pond walls on two sides of the flocculation pond. In order to ensure that the newly constructed flocculation tank does not leak water, the newly constructed flocculation tank needs to be hermetically connected with the original tank wall and the bottom plate.

In some embodiments, the specific construction method is as follows: firstly, cleaning impurities on the bottom plate and the wall of the advection pool 50 according to the construction position, removing algae and sludge on the wall of the advection pool, washing the impurities by using clean water and drying the impurities. Then, roughening treatment is carried out on the bottom and the surface of the tank wall of the advection tank, and partial concrete protective layers on the side wall and the bottom plate of the tank body are cleaned, so that the original structural steel bars of the tank body are exposed, and damaged concrete is cleaned. And then planting ribs on the bottom plate and the side wall of the advection pool 50, manufacturing a water stop steel plate, fixedly connecting the water stop steel plate with the ribs of the original structure of the pool body, and brushing waterproof silica gel on the joint. And (3) paving reinforcing steel bars in the formwork to form a reinforcing steel bar mesh, fixedly connecting the reinforcing steel bars with the reinforcing steel bars implanted into the bottom plate and the pool wall to ensure the connection strength, and pouring C30 concrete to form a concrete wall and maintaining the concrete wall. Here, it should be emphasized that the concrete of the flocculation basin constructed by the light material and the steel material is poured with a thickness not exceeding the thickness of the water stop steel plate, so as to ensure that the water stop steel plate can be reliably and fixedly connected with the flocculation basin frame constructed by the light material and the steel material. And after the concrete poured on the side wall and the tank bottom plate is constructed, maintaining and installing the light material side wall and the steel material side wall at two sides of the flocculation tank, uniformly installing large-head rivets on the installed side wall and the existing tank wall, spraying waterproof silica gel, inlaying and hanging a steel wire mesh, spraying special cement mortar and coating a waterproof silica gel layer at the next time.

In this case, to meet the filtration process of the first modified zone effluent, in some embodiments, when arranging an adjacent new flocculation zone and a plurality of sedimentation modules having a sedimentation treatment scale at least matching the new flocculation zone in the second modified zone, the method further comprises: a filtration zone is arranged in the first modification zone, downstream of the plurality of precipitation modules 60, and the filtration process scale of the filtration zone at least matches the primary flocculation zone 10 located upstream thereof.

The specific steps for constructing the filtering area are as follows: the improved filtering area is provided with a modularized filtering device, during the operation process, the filtering material in the modularized filtering device needs to be subjected to water backwashing (or air-water backwashing), the filtering area needs to discharge backwashing wastewater and flow the effluent of the filtering area to a clean water tank, and the side wall of the equipment is provided with a butt joint flange of each pipeline.

It should be noted that, for the filtration module, the effluent refers to filtered clean water, and the drain refers to waste water discharged from the backwashing.

Specifically, the water outlet pipe, the back flushing pipe, the drainage pipe of the filtering area and other pipelines of the modular filtering device are uniformly distributed between the water outlet end of the modular filtering device and the wall of the advection pool 50 close to the water outlet end to form a pipe gallery, wherein the back flushing pipe can be a back flushing water inlet pipe in the embodiment according to engineering requirements, and in addition, the back flushing pipe can be a back flushing air inlet pipe in other embodiments. Wherein, all pipelines are arranged close to the wall of the advection pool 50, and a steel bracket or a concrete buttress is arranged at the pool bottom of the filtering area and is used for supporting the water outlet pipe, the backflushing pipe and the water outlet pipe. Wherein, a water outlet pipeline, a water drainage pipeline, a backwashing water inlet pipeline and a backwashing air inlet pipeline are sequentially arranged from the bottom plate of the advection pool 50 to the upper part, and all the pipelines are connected with the modularized filtering device through a flange plate and sprayed with anticorrosive paint.

Furthermore, a plurality of through holes are required to be formed in the positions, corresponding to the pipelines, of the side walls of the advection pool 50, water stop rings (wall penetrating positions) are installed on the pipelines or wall penetrating sleeves are manufactured at the through holes, after the pipelines are installed, waterproof expansion concrete is used for plugging, and after plugging is completed, waterproof mortar is smeared inside and outside the side walls of the advection pool 50 for sealing. Of course, in some embodiments, concrete, steel, or lightweight materials may also be used to isolate the modular filtration devices from the side walls of the advection basin 50 to form individual tube lane areas.

Referring to fig. 1, an existing advection pool 50 is a groove-shaped structure with an open top, and a structure for precipitation is provided inside, the structure for precipitation may include a flow stabilizing grid, a water distribution facility such as a water distribution wall, a water collection facility such as a water collection tank, and a sludge discharge device according to different types of the advection pool, and the method provided by the present disclosure further includes: before arranging the plurality of settling modules 60 in sequence in the advection pool 50, removing the settling structure inside the advection pool 50; after the dismantling is finished, the pool bottom and the pool wall of the original advection pool 50 need to be cleaned, so that the dismantled pool body has a flat pool bottom and a flat pool wall, and the cleaning process mainly cleans dead corners which are neglected for a long time so as to facilitate the subsequent operation and construction. After the removal, in order to conveniently and subsequently install the sedimentation module 60 in the pond, the pond bottom needs to be leveled, because the original advection pond 50 has a sludge collecting ditch for collecting and discharging sludge, aiming at the advection pond 50 with the sludge collecting ditch, the sludge collecting ditch is shaved or filled according to different types of the sludge collecting ditch, specifically, aiming at the sludge collecting ditch sunken from the pond bottom, the sludge collecting ditch is filled, and aiming at the sludge collecting ditch formed by rising on the pond bottom, the sludge collecting ditch is shaved.

Referring to fig. 2, the removed, cleaned and leveled tank body has a flat and horizontal tank bottom and a tank wall, wherein the tank wall comprises a first end wall close to the flocculation zone 10, a second end wall opposite to the first end wall in the extending direction of the advection tank 50, and two side walls connected between the first end wall and the second end wall, and the first end wall is provided with water distribution holes 20. It should be explained that the first end wall refers to the end wall separating the flocculation basin 10 from the advection basin 50, and the first end wall can be present in the water purification plant before modification or in the water purification plant after modification. The second end wall is an end wall corresponding to the first end wall, and according to the following description, the second end wall may be an end wall of the original advection pool 50 in the extending direction, or an end face which is modified to correspond to the first end wall in the extending direction of the advection pool 50 and enclose a space for installing the precipitation module 60.

Further, referring to fig. 3, in the present embodiment, the first modified zone is communicated with the primary flocculation zone 10 through the water distribution holes 20 of the primary flocculation zone 10, in the first modified zone, the first modified zone is divided into a water inlet side 41 and a water outlet side 42 by a plurality of precipitation modules 60, the water distribution holes 20 are located on the water inlet side 41, and the modification method further includes: on the water inlet side 41, a water inlet channel is established between the water distribution holes 20 and the water inlet of the precipitation module 60; on the drain side 42, a drain passage is established that communicates with the drain port of the precipitation module 60.

In order to make the water treated in the flocculation zone 10 flow into each of the sedimentation modules 60, the water inlet passage and the water discharge passage can be realized by connecting pipelines, or by newly building a canal. For example, in some embodiments, the step of establishing a water intake channel may include: the sedimentation module 60 is attached and fixed on the first end wall, or the sedimentation module 60 is fixed at a position close to the first end wall at intervals, the positions of the two side surfaces of the sedimentation module 60 close to the first end wall are respectively provided with a baffle, the baffle is attached to the side surfaces, the bottom of the tank and the wall of the tank in a sealing manner, and the height of the baffle is parallel to the sedimentation module 60, and at the moment, a new water distribution hole is required to be formed in the baffle to communicate the original flocculation area 10 with the advection tank 50. Then, the other precipitation modules 60 are sequentially connected and arranged along the extension direction of the advection pool 50, and the adjacent precipitation modules 60 are sealed in a fitting manner, so that a water distribution channel is formed on the water inlet side; an adjustable weir is provided in the settling module 60 near the inlet of the distribution canal for controlling the flow into the settling module 60. Here, the precipitation modules 60 are connected in sequence, and in order to isolate the water inlet channel from the water outlet channel, the adjacent precipitation modules 60 and the second end wall are both sealed in a fitting manner, so as to prevent the water which is not precipitated from directly flowing into the water outlet channel or the water of the water outlet channel from flowing back to the water inlet channel.

Further, to snugly and sealingly attach precipitation module 60 to the first end wall, in some embodiments, the step of snugly securing precipitation module 60 to the first end wall comprises: the side edges of the sedimentation modules 60 extending in the extension direction of the advection basin are fixedly connected to the first end wall by angle steel.

Referring to fig. 16, specifically, the tank body at the joint to be connected is cleaned, algae and sludge on the tank wall of the first end wall are removed, then the tank body is roughened, subsequent construction of waterproof mortar and a waterproof layer is facilitated, and after roughening, the tank body is grooved along the joint surface of the angle steel and the tank body, so that a concrete protective layer is broken. The main steel bars on the first end wall are fixedly connected with one part of the angle steel, and the other part of the angle steel is fixedly connected with the precipitation module 60 so as to fix the precipitation module 60 on the first end wall.

After the channel is fixed, a reinforcing mesh is laid inside the formed channel, the reinforcing mesh is connected with the original tank embedded bars, then special silica gel concrete is sprayed, a liner coiled material, ECB (electronic control bus) and other waterproof coiled materials are laid inside the channel, finally, the channel is built by adopting the compensation shrinkage concrete, and ceramic tiles are attached.

Further, to seal the precipitation module 60 from the first end wall, in some embodiments, the method further comprises: coating waterproof paint on the angle steel and the joint of the angle steel, and performing waterproof treatment on the outer side of the waterproof paint by using waterproof mortar; and the gap between the precipitation module 60 and the first end wall is filled with lost circulation material.

Specifically, in some embodiments, it is desirable to control the irregular gap between the settling module 60 and the first end wall to be between 10-30mm, so that after the settling module 60 is in place, a plugging king is poured between the Russian gaps by means of high pressure grouting. In addition, a layer of waterproof mortar with the thickness of 20mm is coated on the outer side of the angle steel coated with the polyurethane waterproof paint for waterproof treatment.

Similarly, in order to provide a sealed connection between adjacent precipitation modules 60, in some embodiments, the step of sequentially connecting the other plurality of precipitation modules 60 comprises: fixedly connecting the adjacent surfaces of two adjacent precipitation modules 60; and after the fixed connection is finished, performing waterproof treatment on the connection gap.

In the above case, the water inlet channel is an open water distribution channel composed of the sedimentation module 60 and the wall of the horizontal flow tank 50.

Further, in the actual operation process of the advection pool 50, in order to ensure the flocculation effect of the water in the flocculation area, the flowing speed of the water in the water distribution channel is slow, and the sludge at the bottom of the water distribution channel is serious. In order to ensure that the water distribution channel can work normally, in some embodiments, the specific modification method further includes: and (3) cleaning the deposited sludge from the flocculation area 10 to the water distribution channel of the sedimentation module 60.

Referring to fig. 14, specifically, a steel bracket or a concrete buttress is disposed at the bottom of the distribution canal, a distribution canal 100 is disposed above the steel bracket or the concrete buttress, the cross section of the distribution canal 100 is configured as a right trapezoid, further, the bottom surface of the distribution canal 100 is configured as an inclined shape having an angle with the bottom of the advection pool 50, and the bottom surface forms a V-shaped mud collecting groove with one side surface of the distribution canal 100, so that the mud accumulated inside the distribution canal 100 can be settled together for convenient cleaning. To prevent water in the delivery raceway 100 from flowing directly from the top of the settling module 60 to the drain side 42, in some embodiments, the top height of the delivery raceway 100 is the same as the top height of the settling module 60. Furthermore, in other embodiments, the delivery raceway 100 is at a lower elevation than the settling module 60.

In order to discharge accumulated mud in the mud collecting groove regularly, in some embodiments, a mud collecting hopper can be arranged at the end part of the water inlet channel, and a valve is arranged below the mud collecting hopper and connected with a mud discharging pipeline. In addition, a driving type mud scraper 90 can be arranged at the top of the water inlet channel, a mud level detector is arranged in the mud collecting groove and connected with the mud scraper 90, and the mud scraper 90 is controlled to scrape away the accumulated mud in the mud collecting groove according to set mud level operation parameters. And opening or closing the valve of the sludge discharge pipeline of the sludge collection hopper at regular time to discharge accumulated sludge at proper time, wherein the sludge discharge pipeline may be connected to the sludge discharge pipeline of the precipitation module 60, and of course, in some other embodiments, the sludge discharge pipeline may discharge sludge alone, which is not limited in this disclosure.

Specifically, the transportation and distribution water channel 100 can be fixed by a steel structure support fixedly connected with a square pipe, a channel steel or an angle steel or a concrete buttress cast by concrete, before the support or the buttress is installed, the place where the support or the buttress is arranged under the transportation and distribution water channel 100 needs to be cleaned, the steel structure support needs to clean a concrete protective layer on a bottom plate at four feet of the support, and the position of the concrete buttress needs to be roughened on the surface of the bottom plate. The steel structure support carries out fixed connection with the bottom plate reinforcing bar after the clearance, and the concrete buttress draws the within range formwork and fixed of hair at the bottom plate of the pool, concreting, the roughness of the upper surface of support and buttress need be guaranteed simultaneously.

In order to establish a connection between the water distribution holes 20 and the water inlet of the precipitation module 60, in addition to the open type delivery water channel 100 described above, in some embodiments, the step of establishing the water inlet channel may further include: leading out a water inlet main pipe from the water distribution holes 20; the water inlet main pipe is connected to the water inlets of the plurality of precipitation modules 60 by the water inlet branch pipes; and a regulating valve is arranged in the water inlet pipe.

To achieve the sealing between the water distribution holes 20 and the water inlet header, in some embodiments, referring to fig. 15, the specific operations may be: firstly, impurity cleaning is carried out on the wall of the pool around the water distribution hole 20, algae and sludge on the wall of the pool are swept, the pool body is napped, subsequent waterproof mortar and waterproof layer construction is facilitated, then a concrete protective layer in the water distribution hole 20 is broken, double-layer steel bars 24 are woven in the water distribution hole 20, the double-layer steel bars 24 are fixedly connected with original main steel bars of the pool body, and a waterproof flexible sleeve 70 is arranged in a gap of the double-layer steel bars 24. After the work is finished, the two sides of the water distribution hole 20 are supported and fixed to be filled with the expansive impermeable concrete, after the concrete is cured, a silica gel waterproof layer is coated at the junction of the newly-poured concrete and the original pool wall and on the surface of the newly-poured concrete, and finally, the water inlet header pipe of the precipitation module 60 is installed in the waterproof flexible sleeve 70.

Since the original water distribution holes 20 have too large apertures, in some embodiments, the water distribution holes 20 are usually partially plugged before the water inlet channel is established. Specifically, referring to fig. 4-5, firstly, according to the project scale, installing holes 21 are arranged at the positions where the water distribution holes 20 need to be plugged, the hole pitch is 150mm, and the hole depth is not less than 150mm, on the basis of the previous step, the steel bars are planted in the installing holes 21 of the water distribution holes 20, the diameter of the steel bars is 10mm, the pitch is 150mm, and the steel bars 22 are not less than 150mm deep into the original structure. And after the steel bars are planted, formwork supporting operation is carried out by utilizing the formwork 23, and finally concrete is poured.

To discharge the settled sludge of the settling module 60, in some embodiments, the step of removing the settling structure inside the advection basin 50 comprises: cutting off the original sludge discharge pipe of the advection pool 50 at a position close to the pool wall, wherein the method further comprises fixedly connecting a first flange on the cutting surface of the sludge discharge pipe; the sludge discharge ports of the plurality of sedimentation modules 60 are communicated, and the communicated pipeline extends to the first flange and is fixedly connected with the second flange; the first flange and the second flange are connected.

Specifically, in some embodiments, a sludge discharge pipe is arranged in the original advection pool 50 which needs to be modified for capacity expansion, when accumulated sludge and impurities in the advection pool 50 are cleaned, the sludge discharge pipe in the pool body needs to be kept complete within a length of 500mm close to the pool wall, the inner surface and the outer surface of the sludge discharge pipe are cleaned, the sludge discharge pipe is exposed out of the natural color of the material, the sludge discharge pipe is cut at a position 350mm away from the pool wall, and a steel flange or a glued plastic flange is fixedly connected. Then, spraying anticorrosive material on the inner and outer surfaces of the sludge discharge pipe part close to the pool wall and the flanges, communicating the sludge discharge pipes of the plurality of sedimentation modules 60 close to the sludge discharge pipes, wherein the diameter of the communicated pipeline is equivalent to the specification of the existing sludge discharge pipe of the advection pool 50 and extends to the first flange, installing another flange on the communicated pipeline, and connecting the two flanges. Of course, the cut-off of the original sludge discharge pipe needs to be adaptively designed according to the specific parameters of the water plant, and is not limited here.

It is emphasized that some advection basins 50 in earlier-built water purification plants are typically comprised of two or more basins, and during the modification of one of them, protection during construction of the non-modified basin is required in order for the other basin to continue working.

Specifically, firstly, the sequence of reforming the advection pool 50 needs to be determined, the pool body on one side or two sides of the advection pool is constructed and protected according to the established construction pool body, and a construction safety distance is reserved on the walking platforms on two sides or one side of the top end of the constructed pool body. In addition, it is necessary to install expansion bolts or guide rail brackets on the deck and the ceiling above the deck, and to install fixing rods and support brackets for fixing dust-proof materials. Then, plastic cloth, dustproof cloth, light material partition and other facilities which can play a role in dust isolation are installed. In addition, a ventilation and dust removal device is required to be installed outside the windows on two sides or one side of the expansion and transformation pool body. It is noted that the advection basin 50 is strictly prohibited from destroying installed field construction protection equipment during the expansion reconstruction.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.

Claims

1. A modular capacity-expanding and standard-upgrading reconstruction method for a water treatment plant adopting an advection pool process is characterized by comprising the following steps:

dividing the advection pool (50) into a first modification area and a second modification area along the extension direction of the advection pool, wherein the first modification area is communicated with a primary flocculation area (10) positioned at the upstream of the advection pool (50);

arranging a plurality of sedimentation modules (60) in sequence in the first reclamation area along the extension direction of the advection pool (50) so that the first reclamation area has a sedimentation treatment scale at least matched with the primary flocculation area (10), wherein each sedimentation module (60) comprises a shell and a sedimentation device accommodated in the shell; and

and arranging a water treatment module with a non-settling function in the second modification area, or arranging a new flocculation area adjacent to the second modification area and a plurality of settling modules with settling treatment scales at least matched with the new flocculation area in the second modification area.

2. The retrofitting method of claim 1, wherein said water treatment module comprises an ozone activated carbon adsorption tank, or an air flotation module, or a manganese sand filtration module, or an ultrafiltration module, or a reverse osmosis module, or an arsenic removal module,

wherein, the ozone activated carbon adsorption pond includes ozone contact zone and active carbon filtering pond, preferably, arrange the step of ozone activated carbon adsorption pond into in the second transformation district includes:

a plurality of inclined plates (110) which form included angles with the bottom of the advection pool (50) are sequentially arranged in the ozone contact zone from bottom to top at intervals, and two adjacent inclined plates (110) are respectively fixedly connected with different side walls on two sides of the advection pool (50) and are arranged at intervals with opposite side walls;

arranging a top plate (120) of the ozone contact zone into an inclined shape with an included angle with the bottom of the advection pool (50), and arranging an ozone reflux device (130) at the higher end of the top plate (120); and

and a waste carbon collecting device is arranged in the activated carbon filter to collect activated carbon particles carried by activated carbon backwashing water.

3. The retrofitting method according to claim 1, characterized in that when arranging in said second retrofitting zone an adjacent new flocculation zone and a plurality of precipitation modules having a precipitation treatment scale at least matching said new flocculation zone, said method further comprises:

-arranging a filtration zone downstream of the plurality of precipitation modules (60) and having a filtration process scale at least matching the preflocculation zone (10) upstream thereof in the first upgrading zone, preferably the step of arranging a filtration zone in the first upgrading zone comprises:

a water outlet pipe, a back flushing pipe and a water discharge pipe of the filtering area are arranged between the water outlet end of the filtering area and the pool wall close to the water outlet end;

a steel bracket or a concrete buttress is arranged at the bottom of the filtering area and is used for supporting the water outlet pipe, the back flushing pipe and the water discharge pipe;

a plurality of through holes are formed in the wall of the pool, and the water outlet pipe, the backflushing pipe and the water discharge pipe respectively penetrate through the corresponding through holes; and

and sealing and waterproofing the gaps among the through holes, the water outlet pipe, the back flushing pipe and the water discharge pipe.

4. The retrofitting method according to claim 1, characterized in that, prior to the step of arranging said plurality of settling modules (60) in sequence in said advection basin (50), said method further comprises:

and removing the sedimentation structure in the advection pond (50) to ensure that the removed pond body has a flat pond bottom and a flat pond wall, wherein the pond wall comprises a first end wall close to the flocculation zone (10), a second end wall opposite to the first end wall in the extension direction of the advection pond (50), and two side walls connected between the first end wall and the second end wall, and the first end wall is provided with water distribution holes (20).

5. The retrofitting method according to claim 4, characterized in that, after the step of dismantling the construction for sedimentation inside said advection basin (50), and before the step of arranging in sequence said plurality of sedimentation modules (60) in said advection basin (50), said method further comprises:

filling or shaving the mud collecting ditch flat according to the structure of the original mud collecting ditch of the advection pool (50);

and a connecting piece is embedded at the bottom of the advection pool (50) and is used for being fixedly connected with the sedimentation module (60).

6. The retrofitting method according to claim 5, wherein said first retrofitting zone communicates with said primary flocculation zone (10) through a water distribution aperture (20) of said primary flocculation zone (10), wherein said plurality of settling modules (60) divide said first retrofitting zone into a water inlet side (41) and a water discharge side (42), said water distribution aperture (20) being located on said water inlet side (41), said method further comprising:

establishing a water inlet channel between the water distribution holes (20) and the water inlet of the precipitation module (60) on the water inlet side (41);

on the drainage side (42), a drainage channel is established which communicates with the drainage opening of the precipitation module (60).

7. The retrofitting method of claim 6, wherein said step of establishing said water inlet channel comprises:

attaching and fixing one sedimentation module (60) to the first end wall, or alternatively, fixing one sedimentation module (60) at a position close to the first end wall at intervals, and arranging baffle plates close to the first end wall on two side surfaces of the sedimentation module (60), wherein the baffle plates are hermetically attached to the side surfaces, the bottom of the tank and the wall of the tank and are flush with the sedimentation module (60) in height;

sequentially connecting and arranging other sedimentation modules (60) along the extension direction of the advection pool (50), and attaching and sealing the adjacent sedimentation modules (60) to form a water distribution channel on the water inlet side; and

an adjustable weir is arranged on the sedimentation module (60) near the water inlet of the water distribution channel for controlling the flow rate flowing into the sedimentation module (60),

preferably, after the water distribution channel is formed on the water inlet side, the step of establishing the water inlet channel further comprises:

arranging a steel bracket or a concrete buttress at the bottom of the water distribution channel;

arranging a distribution canal (100) above the steel support or the concrete buttress, wherein the bottom surface of the distribution canal (100) is configured to be inclined with an angle with the bottom of the advection pool (50), and the bottom surface and one side surface of the distribution canal (100) form a V-shaped mud collecting groove, and preferably, the method further comprises the following steps:

a mud collecting hopper is arranged at the end part of the water inlet channel, and a valve is arranged below the mud collecting hopper and connected with a mud discharging pipeline;

a driving type mud scraper (90) is arranged at the top of the water inlet channel, a mud level detector is arranged in the mud collecting groove, and the mud level detector is connected with the mud scraper (90); and

connecting the sludge discharge pipeline to the original sludge discharge pipe of the advection pool (50),

wherein preferably the step of snugly securing one of said precipitation modules (60) to said first end wall comprises:

fixedly connecting the side edge of the sedimentation module (60) extending along the extension direction of the advection pool (50) to the first end wall through angle steel;

painting waterproof paint on the angle steel and the joint of the angle steel, and performing waterproof treatment on the outer side of the waterproof paint by using waterproof mortar; and

-pouring a plugging material in the gap between the precipitation module (60) and the first end wall.

And wherein preferably the step of arranging a further plurality of said precipitation modules (60) in series comprises:

fixedly connecting the adjacent surfaces of two adjacent precipitation modules (60); and

and after the fixed connection is finished, performing waterproof treatment on the connection gap.

8. The retrofitting method of claim 6, wherein said step of establishing said water inlet channel comprises:

leading out a water inlet main pipe from the water distribution holes (20);

the water inlet main pipe is connected to the water inlets of a plurality of sedimentation modules (60) in a bypassing manner through a water inlet branch pipe;

a regulating valve is arranged in the water inlet pipe,

wherein preferably, before the step of leading out the water inlet main from the water distribution holes (20), the method further comprises the following steps:

double-layer steel bars (24) are woven in the water distribution holes (20), and the double-layer steel bars (24) are fixedly connected with the original steel bars of the tank body;

installing a waterproof flexible sleeve (70) in a gap of the double-layer steel bar (24), wherein the waterproof flexible sleeve (70) is used for installing the water inlet main pipe;

supporting a formwork on two sides of the water distribution hole (20) and pouring concrete; and

and coating a silica gel waterproof layer on the junction of the newly poured concrete and the original pool wall and the surface of the newly poured concrete.

9. The retrofitting method according to claim 6, characterized in that it comprises:

before the water inlet channel is established, the water distribution holes (20) are partially blocked, and preferably, the step of partially blocking the water distribution holes (20) comprises the following steps:

the inner wall of the water distribution hole (20) is provided with a mounting hole (21);

implanting a planting bar (22) in the mounting hole (21); and

and (3) erecting the formwork of the mounting hole (21) in which the planting bar (22) is implanted and pouring concrete.

10. The retrofitting method according to claim 1, wherein the step of dismantling the settling structure inside the advection basin (50) comprises: cutting off the original sludge discharge pipe of the advection pool at the position close to the pool wall, wherein the method also comprises the following steps:

fixedly connecting a first flange on the section of the sludge discharge pipe;

the sludge discharge ports of the sedimentation modules (60) are communicated, and the communicated pipeline extends to the first flange and is fixedly connected with the second flange; and

connecting the first flange and the second flange.