WO2021098731A1

WO2021098731A1 - Wastewater interception centralized treatment system and treatment method for river channel regulation

Info

Publication number: WO2021098731A1
Application number: PCT/CN2020/129824
Authority: WO
Inventors: 祝栋林; 刘文杰; 胥瑞晨; 陈海涛
Original assignee: 江苏易域经环境科技有限公司
Priority date: 2019-11-22
Filing date: 2020-11-18
Publication date: 2021-05-27
Also published as: CN110862191A

Abstract

A wastewater interception centralized treatment system and treatment method for river channel regulation. Said treatment system comprises a wastewater interception pipe network (1), an integrated strengthened treatment assembly (2), and an ecological restoration assembly (3). Said treatment system converts non-point source pollution into point source pollution by means of the wastewater interception pipe network (1), performs centralized, high-efficiency, and strengthened treatment by means of the integrated strengthened treatment assembly (2) to remove a large amount of sludge sediment, ammonia nitrogen, chemical oxygen demand, total phosphorus, and biochemical oxygen demand from wastewater, performs primary sedimentation and filtration by means of flow diverting weirs (301) in the ecological restoration assembly (3), and enables wastewater to flow through artificial ecological floating islands (302) and artificial aquatic weeds (303), and uses developed root systems of aquatic plants (302b) and biofilm carriers (303a-22) to perform secondary biodegradation on wastewater, so as to realize wastewater purification. Said treatment system and treatment method use wastewater interception and centralized treatment, achieving thorough direct discharge control of wastewater and a good scale effect, and combine a biological filter bed process and ecological restoration techniques, further effectively preventing spread of pollutant from discharge ports by means of an ecological effect while ensuring the efficient and strengthened treatment.

Description

Sewage interception centralized treatment system and treatment method for river treatment

Technical field

The invention relates to a sewage treatment system and a treatment method, in particular to a sewage interception centralized treatment system and a treatment method for river treatment, and belongs to the technical field of river water treatment.

Background technique

The water ecological environment has always been an important part of the entire ecological environment. The report of the 19th National Congress of the Communist Party of China pointed out that “the modernization we want to build is the modernization of the harmonious coexistence of man and nature. It is necessary to create more material wealth and spiritual wealth to satisfy the growing people. In order to meet the needs of the people for a better life, we must also provide more high-quality ecological products to meet the people’s growing demand for a beautiful ecological environment.” Therefore, responding to the voice of the majority of the people, improving the urban and rural water environment, and creating a beautiful China and beautiful villages have become important One of the themes of the times.

However, with the development of social economy and the advancement of urban and rural industrialization, most cities and towns in the southeast coastal areas have appeared in the black and odor that it is difficult to eradicate small and medium rivers and small watersheds. For this reason, water affairs and water conservancy departments in many places all hope to thoroughly solve the black and odor problem of such rivers through ordinary water conservancy projects such as river dredging, ecological bank protection, and municipal projects such as sewage interception and pipe management, but the actual effect is not satisfactory. Although river dredging and ecological bank protection can solve the problems of black and odor and siltation of rivers in a short period of time, over time, the phenomenon of rivers returning to black and odor is still not rare. The reason is that in the process of treating black and odorous rivers, we only focus on the reconstruction of bank protection and silt "hardware facilities", while ignoring the restoration of the "software facilities" of the overall ecological function of the river water body. The water ecological restoration project can greatly improve the river's own reoxygenation and self-purification capabilities, and solve the black and odor of the river. The management experience of many river projects has told us that interception of pollution is the first step in river management, but the difficulty of interception is also the most difficult in the process of river management. How to deal with the difficult engineering situation of pollution interception on the shore in the current existing technology, so as to realize the pollution interception and treatment in the river has become a problem that needs to be solved at present.

In addition, the research team of this application project conducted a series of investigations on the causes and pollution sources of the black and odorous rivers, and found that the drainage outlets on both sides of the river are the main point source pollution. Because the black and odorous rivers are often formed in urban areas, the urban sewage interception and pipeline project It is often difficult to achieve, or cannot be completed completely, and gray-black domestic sewage is often discharged from the drain, which is also the main reason for the deterioration of water quality. Pollution comes from the accumulation of pollution sources at discharge outlets, precipitation and fish farming deposits, and the release of pollutants in the bottom sludge to the water body. However, most of the pollution comes from the drainage outlets. Therefore, the above-mentioned pollution discharge outlets pollute the river. The same problem as the above-mentioned difficulty of onshore pollution interception has become a current problem to be solved.

Summary of the invention

In order to solve the above technical problems, the present invention provides a centralized sewage interception treatment system and treatment method for river treatment.

The technical scheme of the present invention is:

The invention discloses a sewage interception centralized treatment system for river treatment, the treatment system includes

The sewage interception pipe network is arranged on the side of the current river mouth line facing the land area, and the inlet of the sewage interception pipe network is connected with the sewage outlets along the river and can take the sewage discharged from the sewage outlets along the river into the Inside the sewage interception pipe network;

Integrated enhanced treatment component, the integrated enhanced treatment component is positioned and buried under the ground on one side of the land direction at the front line of the primary revetment of the centralized sewage treatment area, and the sewage inlet of the integrated enhanced treatment component and the sewage interception pipe The outlet of the net is connected, and the drainage outlet of the integrated enhanced treatment component opens into the river; the integrated enhanced treatment component includes a hydrolysis acidification tank, a contact oxidation tank, a secondary sedimentation tank and a disinfection tank which are arranged and connected in sequence along the sewage inlet direction Pool; and

The ecological restoration component includes a number of diversion weirs located near the outlet of the integrated enhanced treatment component in the river channel. Based on the flow direction of the sewage body, a number of artificial ecological floats float on the surface of the water body in front of the diversion weir. Island, and artificial aquatic plants are located on the river bed in front of the diversion weir.

Its further technical solutions are:

The interception pipe network is composed of interconnected interception pipes, and the diameter of the interception pipe is not greater than 800mm; each interception pipe includes an inner pipe for collecting and transporting sewage and a coaxial positioning sleeve The casing set on the inner tube is based on the state of use. On the upper surface of the outer wall of the casing, a number of hoisting hooks for hoisting are spaced and fixed in the axial direction, and the lower surface of the outer wall of the casing is arranged along the axis. A number of positioning brackets for fixing the sleeve on the mounting substrate are fixed to the space.

Its further technical solutions are:

The hydrolysis and acidification tank, the contact oxidation tank, the secondary sedimentation tank and the disinfection tank all include a tank body connected via a water passage located in the upper middle and upper part of the common side wall, wherein the bottom of the hydrolysis and acidification tank and the contact oxidation tank are both positioned at the bottom of the tank body. A microporous aeration device inflated into the water body, and the two types of tanks above the microporous aeration device are both positioned and arranged along the vertical direction with several rows of elastic fillers; the bottom of the second settling tank is a cone Shaped structure, the included angle between the bus bar of the tapered structure and the axis is not greater than 40°, and an annular water collection device is positioned in the secondary sedimentation tank; the top of the disinfection tank is positioned with a reagent dispensing device for dispensing disinfectant .

A sludge pump for pumping sludge from the bottom of the hydrolysis and acidification tank or the contact oxidation tank is positioned in the tank body, and the discharge port of the sludge pump is connected with the feed port of a sludge drying bed; the disinfection At least one sewage pump for extracting treated sewage is positioned in the tank, and the water outlet of the sewage pump is connected with the river channel through a water outlet pipe.

Its further technical solutions are:

A number of the diversion weirs are sequentially arranged on the river slope on the side of the water area with the front line of the first-level revetment, and each of the diversion weirs consists of a diversion channel and a filter stone filled in the diversion channel Filling composition, the longitudinal section of the diversion weir is a trapezoidal structure.

Its further technical solutions are:

The artificial ecological floating island includes an island body that is positioned and floated on the surface of the water body by a heavy object method and is located near the center line of the river. The island body is planted with aquatic plants with well-developed roots at a planting density of ^{15-20 trees/m 2} Plants, and the roots of the aquatic plants are lower than the lowest water level of the river.

Its further technical solutions are:

The artificial waterweed includes a number of artificial waterweed units, each of the artificial waterweed units includes a tether, one end of the tether is fixed with an artificial aquatic body, and the other end of the tether is fixed in a submerged block; The artificial aquatic herb includes a sinker fixedly connected to one end of the tether and in a strip shape. A plurality of fibrous biofilm carriers are fixedly arranged on the sinker, and each biofilm carrier is A float is formed on the top.

A number of the artificial aquatic plants are ^{arranged on the river bed of the natural base material at a density of 9-12 roots/m 2} ; or the submerged blocks of a number of the artificial aquatic plants are arranged at a density of 9-12 roots/m ² The density interval is embedded in the geogrid, and other compartments backfilled with planting soil in the geogrid are fixedly provided with a number of anchor rods that can be inserted into the river bed of the flexible soil foundation.

The present invention also discloses a centralized sewage interception treatment method for river treatment based on the above-mentioned sewage interception centralized treatment system. The treatment method mainly includes the following steps:

S1: Analyze the pollution source, and investigate the sewage outlets along the river course and analyze the collected water volume of the sewage outlets; based on the above-mentioned pollution source analysis and the results of the sewage collection water quantity analysis, a sewage interception pipe network is arranged on the side of the current river mouth towards the land area to make The water inlet of the sewage interception pipe network is connected with the sewage outlets along the river, and the sewage discharged from the sewage outlets along the river is included in the sewage interception pipe network;

S2: The sewage from the outlet of the sewage interception pipe network enters the integrated enhanced treatment module through the sewage inlet of the integrated enhanced treatment module, and flows through the hydrolysis acidification tank, contact oxidation tank, secondary sedimentation tank and disinfection tank in sequence. The treated sewage is discharged into the river channel from the outlet of the integrated enhanced treatment module by the sewage pump, and the bottom sludge extracted by the sludge pump is treated by the sludge drying bed;

S3: The sewage discharged from the drainage outlet of the integrated enhanced treatment component flows through the diversion weir of the ecological restoration component in turn. After the sewage is settled and filtered by the filter stone filler filled in the diversion weir, it flows through the water body located in the river. The artificial ecological floating island in the upper half and the artificial aquatic plants located in the lower half of the river water body use the developed root system of aquatic plants planted on the artificial ecological floating island and the biofilm carrier set on the artificial aquatic plants to carry out the secondary biodegradation process of the sewage. , To complete the centralized treatment process of sewage discharge to the river.

Its further technical solutions are:

In step S1, the pipe diameter of each sewage outlet along the river connected with the sewage interception pipe network is not greater than 800mm; the inner pipe of the sewage interception pipe in the sewage interception pipe network is a PVC pipe with a diameter not greater than 800mm, and the inner pipe is The water velocity is 5-5.5m/s, the water fullness of the inner pipe is 0.7-0.8, and the hourly variation coefficient is 6-6.5.

The beneficial technical effect of the present invention is: the treatment system of the present invention includes a sewage interception pipe network, an integrated enhanced treatment component and an ecological restoration component, which converts dispersed non-point source pollution into controllable point source pollution through the sewage interception pipe network. Then go through the integrated enhanced treatment module for centralized, efficient and enhanced treatment to efficiently remove a large amount of sludge precipitation, ammonia nitrogen, chemical oxygen demand, total phosphorus and biochemical oxygen demand in the sewage, and then go through the ecological restoration module. After the initial settlement and filtration of the weir, it flows through artificial ecological floating islands and artificial aquatic plants. The developed roots of aquatic plants and biofilm carriers are used to carry out secondary biodegradation of sewage to achieve sewage purification. The treatment system and treatment method intercept sewage and concentrate treatment. , The direct sewage discharge control is more thorough and the centralized treatment has a good scale effect, and it combines the biological filter process and the ecological restoration technology. On the basis of ensuring efficient and enhanced treatment, it further effectively controls the diffusion of pollutants at the outlet through ecological effects. The effects and environmental effects are good.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the centralized sewage interception treatment system of the present invention;

Figure 2 is a schematic diagram of the structure of the sewage interception pipe of the present invention;

3 is a schematic top view of the structure of the integrated strengthening processing assembly of the present invention;

Fig. 4 is a schematic structural view of the A-A section in Fig. 3;

Figure 5 is a schematic structural view of the B-B section in Figure 3;

Figure 6 is a schematic diagram of the front view of the artificial ecological floating island of the present invention;

7 is a schematic diagram of the top view structure of the island body of the artificial ecological floating island of the present invention;

Figure 8 is a schematic diagram of the structure of the artificial aquatic plant unit of the present invention;

Fig. 9 is a schematic structural diagram of one of the layout modes of the artificial waterweed unit of the present invention;

Fig. 10 is a schematic structural diagram of the second arrangement method of the artificial aquatic plant unit of the present invention;

among them:

1 Sewage interception pipe network;

101 Sewage interception pipe; 101a Inner pipe; 101b Casing; 102 Lifting hook; 103 Positioning bracket;

2 Integrated enhanced processing components;

201 Hydrolysis and acidification tank; 202 Contact oxidation tank; 203 Secondary sedimentation tank; 204 Disinfection tank; 205 Microporous aeration device; 206 Elastic packing; 207 Annular water collection device; 208 Sludge pump; 209 Sewage pump; 210 Inspection window; 211 Support frame

3 Ecological restoration components;

301 Diversion weir;

302 Artificial ecological floating island; 302a Island body; 302b Aquatic plants; 302c Stainless steel ropes; 302d Counterweight stones; 302e Plant planting holes;

303 Artificial aquatic plants;

303a Artificial aquatic plants unit;

303a-1 Tether;

303a-2 Artificial aquatic herb; 303a-21 sink; 303a-22 biofilm carrier; 303a-23 float;

303a-3 Submerged block;

303b Geocell;

303c Backfill soil;

303d Anchor rod;

5 The front line of the first-level revetment

6 River center line;

7 The lowest water level;

8 Conventional water level;

9 The highest water level;

The dotted arrow in the figure points to the water and land area, and the solid arrow is the direction of sewage flow.

Detailed ways

In order to be able to understand the technical means of the present invention more clearly and implement it in accordance with the content of the specification, the specific implementation of the present invention will be described in further detail with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but not To limit the scope of the present invention.

The following is a detailed description of the sewage interception centralized treatment system for river treatment described in the present application. The treatment system mainly includes a sewage interception pipe network 1, an integrated enhanced treatment component 2 and an ecological restoration component 3.

The sewage interception pipe network 1 is arranged on the side of the current estuary line of the river course facing the land area, and is usually buried under the ground or at the bottom of the river course. The water inlet of the sewage interception pipe network is connected with the sewage outlets along the river and can incorporate the sewage discharged from the sewage outlets along the river into the sewage interception pipe network. The sewage interception pipe network adopts the sewage interception treatment technology, which is to collect the sewage from the sewage outlets along the river into the sewage interception pipe network through the sewage interception centralized treatment method, and transport the sewage through the sewage interception pipe network Choose a suitable area downstream for centralized treatment, or directly send the sewage into the municipal sewage pipe network through a pumping station. The former is used in the specific embodiment of the application for centralized treatment.

The above-mentioned interception pipe network 1 is composed of interception pipes 101 connected with each other. Each interception pipe 101 includes an inner pipe 101a for collecting and transporting sewage and a sleeve 101b coaxially positioned and sleeved on the inner pipe. , See Figure 2. When designing the inner pipe of the interceptor pipe, it is necessary to consider the pollution source of the sewage entering the inner pipe and the amount of water collected along the sewage outlet along the river. In this specific embodiment, the interceptor pipe network (especially the inner pipe of the interceptor pipe) is suitable for When the pipe diameter of each sewage outlet of the river is not greater than 800mm. When specifically designing the inner pipe, the inner pipe adopts a PVC pipe with a diameter not greater than 800mm, which is convenient to match with the sewage outlets along the river, and the water velocity in the inner pipe is 5-5.5m/s, most preferably 5m/s; The water body fullness is 0.7-0.8, the best is 0.7; the hourly variation coefficient is 6-6.5, and the best is 6.

In the installation process of the above-mentioned sewage interception pipe network, it is also necessary to consider the safety issues along the river of the sewage interception pipe network, river seepage problems, pipeline protection measures during flood seasons, and pipelines that are prone to hollowing and floating. Therefore, conventional pipelines are used as internal Tube 101a, and a sleeve 101b is coaxially positioned and sleeved outside the inner tube. And based on the state of use, a number of hoisting hooks 102 for hoisting are fixed on the upper surface of the outer wall of the casing 101b at intervals along the axial direction, so that the pipe can be placed in the corresponding position by hoisting; the outer wall of the casing 101b A number of positioning brackets 103 for fixing the sleeve on the mounting substrate are fixedly spaced along the axial direction on the lower surface. Refer to Figure 2. The above-mentioned installation substrate varies according to the installation position of the sewage interception pipe network. The corresponding positioning bracket can be selected according to the actual situation. When buried under the ground or installed at the bottom of a river with a soft foundation, a bracket with an anchor can be used. Mounted on the bottom of the river channel on the hard base, a bracket with steel brazing can be used. The sewage interception pipe network is fixed at the bottom of the river or under the ground by using inner pipes and sleeves. The advantage is that it does not affect the flood and navigation in the river when the river is at the bottom. The water level does not need to be lowered during construction and can be operated with water; on the ground It does not occupy ground space; and after the technical scheme of the sewage interception pipe network intercepts the pollution source, the phenomenon of direct sewage discharge is relatively thoroughly controlled, and the large-scale benefit of centralized treatment is good.

The device for centralized sewage treatment in this application includes two parts, namely, an integrated enhanced treatment component 2 and an ecological restoration component 3. The device uses a combination of biological filter process technology and ecological restoration technology, and optimizes the A/O method, Based on various processes and methods of traditional sewage treatment such as A ² /O method and SBR method, after long-term practice and application of river management, the successful design of intensification, integration, functionalization, motor integration, automation, and ecological A device with a completely new concept.

The integrated enhanced treatment module 2 is positioned and buried in the first-level revetment front line 5 of the centralized sewage treatment area under the ground on one side of the land direction. The sewage inlet of the integrated enhanced treatment module is connected with the outlet of the sewage interception pipe network 1. , And the drainage outlet of the integrated strengthening treatment component opens into the river. The integrated enhanced treatment assembly 2 includes a hydrolysis acidification tank 201, a contact oxidation tank 202, a secondary sedimentation tank 203, and a disinfection tank 204 arranged and connected in sequence along the sewage inlet direction, see FIGS. 3 to 5.

The hydrolysis and acidification tank, the contact oxidation tank, the secondary sedimentation tank and the disinfection tank all include a tank body connected via a water inlet located in the upper middle of the common side wall, and the sewage water inlet of the integrated enhanced treatment component is opened on the side wall of the hydrolysis acidification tank On the upper part, the water outlet of the integrated strengthening treatment component is opened on the upper part of the side wall of the disinfection tank. The bottom of the hydrolysis acidification tank and the contact oxidation tank are both positioned with a microporous aeration device 205 that can inflate into the water body, as shown in Figure 3, the microporous aeration device includes an air branch pipe for conveying air and an air branch pipe. A microporous aerator connected to the air branch pipe, air or oxygen is distributed to the microporous aerator located on the air branch pipe, and the water is filled with air or oxygen through the microporous aerator to increase the water body. The oxygen content can also disturb the water body.

The hydrolysis and acidification tank and the contact oxidation tank are located above the microporous aeration device in the tank body. A number of rows of elastic fillers 206 are positioned along the vertical direction. The rows of elastic fillers are positioned in the tank body through a filler bracket. The elastic fillers are Change the plastic disc press button into a double-circle large plastic ring, press the aldehyde fiber or polyester filament on the ring of the ring, so that the fiber bundles are evenly distributed. The inner ring is made of snowflake-shaped plastic branches, which can not only hang the film but also effectively Cut the air bubbles, improve the oxygen transfer rate and utilization rate, so that the water and gas biofilm can be fully exchanged, so that the organic matter in the water can be efficiently processed. The bottom of the secondary settling tank has a conical structure, and the angle between the generatrix of the conical structure and the axis is not more than 40°, which is convenient for the sludge at the bottom of the secondary settling tank to be discharged, and the secondary settling tank is positioned with an annular collector. Water device 207; the top of the disinfection tank is positioned with a reagent dispensing device for dispensing disinfectant. A sludge pump 208 for pumping sludge from the bottom of the hydrolysis and acidification tank or the contact oxidation tank is positioned in the tank body, and the discharge port of the sludge pump is connected with the feed port of a sludge drying bed; in the disinfection tank At least one sewage pump 209 for extracting the treated sewage is positioned. The outlet of the sewage pump is connected to the river through a water outlet pipe. In this specific embodiment, two sewage pumps are provided. The water drains into the river in the alternate operation mode, and the start and stop of the sewage pump are automatically controlled according to the water level when the pump is turned on and when the water level is stopped. In addition, an inspection window 210 for manual inspection is provided on the top cover of each processing tank in the integrated enhanced processing assembly 2. When burying the integrated strengthening treatment component, a support frame 211 for supporting the integrated strengthening treatment component can be buried underground at the land area close to the front line of the first-level dock.

The integrated enhanced treatment component is after the sewage interception treatment technology, the sewage is concentrated in one area, and the scattered non-point source pollution is transformed into a controllable point source sewage treatment, that is, the polluted sewage can be effectively treated through a complete set of devices. The main function of this component is biological filtration. The four-chamber cavity of hydrolysis acidification tank, contact oxidation tank, secondary sedimentation tank and disinfection tank is designed. It is compatible and equipped with physicochemical, biochemical, chemical methods, UV/Fenton (Fenton reagent) The strong oxidation method and other treatment processes are integrated, and the sewage can effectively remove the ammonia nitrogen, chemical oxygen demand, total phosphorus and biochemical oxygen demand in the sewage after passing through the treatment module.

The ecological restoration component 3 includes a number of diversion weirs 301 in the river channel located near the outlet of the integrated enhanced treatment component 2, and based on the flow direction of the sewage body, a number of artificial ecological floating islands float on the surface of the water body in front of the diversion weir 302, and artificial aquatic plants 303 are located on the river bed in front of the diversion weir.

This particular embodiment is provided with two deflector weir 301, which are sequentially laid on the two weirs flow channel located on a slope on one side of the front line of water revetment direction, and each of the flow by the baffle weir The channel and the filter stone filler filled in the diversion canal, the filter stone filler is preferably cobblestone filler, the diversion weir is arranged so that its length direction is consistent with the length of the river channel, and the diversion weir and the cross section of the river channel The parallel longitudinal section is a trapezoidal structure, which is equivalent to setting two diversion weirs at intervals along the length of the river at the drainage outlet of the integrated enhanced treatment module, and the sewage is preliminarily settled by the filter stone filler filled in the diversion weir. And filter.

The artificial ecological floating island 302 includes an island body 302a that is positioned and floated on the surface of the water body by the heavy object method and is located near the center line 6 of the river. The island body is planted with a well-developed root system at a planting density of ^{15-20 trees/m 2} An aquatic plant 302b, and the bottom end of the root system of the aquatic plant is lower than the lowest water level 7 of the river course. See Figure 6 and Figure 7. The island body 302a is a plate-like structure woven with polyester fibers and natural plant fibers. In this specific embodiment, the size of the plate-like structure can be designed to be 2000×1000×160mm, the porosity is 96%, and the specific surface area is 2000m ² /m ³ , and its average load-bearing capacity is 50kg/m ² ; the specific method of fixing the island body by the weight method is: connecting the island bodies of adjacent artificial ecological floating islands through 8mm diameter stainless steel rope 302c, and at the same time in the rope The end is fixedly connected with a counterweight 302d, and the gravity of the counterweight and the traction of the stainless steel rope are used to locate the island body. The specific weight of the counterweight, suspension point, and length of the stainless steel rope should be based on the site survey of the artificial ecological floating island. The result, the artificial ecological floating island shape and other factors are comprehensively determined. The island body is formed with plant planting holes 302e arranged at intervals. In this specific embodiment, the aperture of the plant planting holes is preferably 90-100 mm. Aquatic plants are planted in the plant planting holes, and the number of plant planting holes is 16 holes. /m ² , if one aquatic plant is planted in each hole, the planting density of aquatic plants is also 16 plants/m ² , and the root system of the aquatic plant is well developed and can extend through the bottom of the woven plant planting hole and extend into the water body. The lush and developed plant roots can achieve secondary biodegradation when passing through this part of the water body. The design method of the artificial ecological floating island can realize the growth of plant ramets and fallen seeds on 100% of the surface area of the artificial ecological floating island.

The artificial waterweed 303 includes a number of artificial waterweed units 303a. Referring to Fig. 8, each artificial waterweed unit includes a tether 303a-1. In this specific embodiment, the tether uses a nylon rope with a diameter of 8 mm. One end of the tether is fixedly provided with an artificial water herb body 303a-2. In this specific embodiment, the length of the artificial water herb body is designed to be 80 cm; the artificial water herb body includes a strip-shaped sinker 303a- which is fixedly connected to one end of the tether rope. 21. A number of fibrous biofilm carriers 303a-22 arranged in parallel and upright are fixed on the sink, and a float 303a-23 is formed on the top of each biofilm carrier, and the artificial aquatic herb is in the water body. At this time, under the action of buoyancy, sinking and floats, the fibrous biofilm carrier can be made upright; the artificial aquatic herb is formed by polymer composite materials, imitating the branches and leaves of aquatic plants, and can float freely in the water to form an upper center. The lower three-dimensional structure layer has a porous structure and therefore has a high specific surface area. Microbes can be enriched on the surface of artificial aquatic plants to form a micro-environment of "aerobic-facultative-anaerobic" composite structure, which can realize nitrification and denitrification. The other end of the tether is fixed in a submersible block 303a-3. The submersible block can be formed from a material with a heavier weight or a higher density. In this specific embodiment, concrete is poured into 200×200×200. The other end of the tether is fixed in the concrete pier during the pouring process.

When the artificial aquatic plants are deployed, they are uniformly ^{deployed at the bottom of the river channel at a deployment density of 9-12 roots/m 2. In} this specific embodiment, the deployment density is most preferably 9 roots/m ² . During the layout, different fixing methods are adopted according to the different substrate conditions of the river bed at the bottom of the river. When the river bed at the bottom of the river is a natural base material, the artificial aquatic plants can be directly placed on the river bed at the bottom of the river at intervals, using submerged blocks ( The gravity of the concrete pier) fixes the artificial aquatic plant unit, see Figure 9; when the river bed at the bottom of the river channel is a flexible soil substrate, a geocell 303b can be used to divide the submerged blocks of several artificial aquatic plant units according to 9-12 roots. /m ² (in this specific embodiment, 9 roots/m ^{2 are} preferred). The layout density is embedded in the geocell at intervals, and then the other cells of the geocell are backfilled with planting soil 303c, and a few pieces of planting soil are backfilled at every interval. An anchor rod 303d is fixed in the geocell. The anchor rod can be inserted into the river bed of the soil flexible base to locate the geocell at the bottom of the river.

When the sewage discharged through the drainage outlet of the integrated enhanced treatment module enters the ecological restoration module, it first flows through two diversion weirs in sequence. The diversion weirs extend the length and time of the drainage process into the river channel and can pass through the pebbles. The filler is settled and filtered to complete the preliminary purification; after passing through the diversion weir, it comes into contact with the artificial ecological floating island and artificial aquatic plants, using the developed root system of aquatic plants planted on the artificial ecological floating island and the biofilm carrier set on the artificial aquatic plants to realize sewage The secondary biodegradation process. The ecological restoration component is essentially a biological interception zone, which is set in the waters of the river channel near the sewage outlet and the river bank zone where the sewage outlet is located. It can intercept the water from the outlet biologically, delay the time for drainage to enter the river, and play an ecological role. The buffer zone protects the ecosystem in the waters near the discharge. The ecological restoration component has good ecological benefits, can effectively control the diffusion of pollutants at the outlet, and make it settle quickly, is suitable for the control of point source pollution in a river section with small flow and multiple outlets, and has high landscape benefits.

This specific embodiment also describes in detail a centralized sewage interception treatment method for river treatment based on the above-mentioned sewage interception centralized treatment system, and the treatment method mainly includes the following steps:

The treatment system of the present invention includes a sewage interception pipe network, an integrated enhanced treatment component and an ecological restoration component, which converts dispersed non-point source pollution into a controllable point source pollution through the sewage interception pipe network, and then undergoes an integrated enhanced treatment component. Centralized, efficient and enhanced treatment to efficiently remove a large amount of sludge precipitation, ammonia nitrogen, chemical oxygen demand, total phosphorus and biochemical oxygen demand in the sewage, and then through the diversion weir in the ecological restoration module for preliminary settlement and filtration, Flowing through artificial ecological floating islands and artificial aquatic plants, the developed roots of aquatic plants and biofilm carriers are used to carry out secondary biodegradation of sewage to achieve sewage purification. The treatment system and treatment method intercept sewage and concentrate treatment, and the direct discharge of sewage is controlled thoroughly and The large-scale effect of centralized treatment is good, and it combines biological filter technology and ecological restoration technology. On the basis of ensuring efficient and enhanced treatment, it further effectively controls the diffusion of discharge pollutants through ecological effects, and has good ecological and environmental effects.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements can be made without departing from the technical principles of the present invention. And variants, these improvements and variants should also be regarded as the protection scope of the present invention.

Claims

A centralized sewage interception treatment system for river treatment, which is characterized in that:

The sewage interception pipe network is arranged on the side of the current river mouth line facing the land area, and the inlet of the sewage interception pipe network is connected with the sewage outlets along the river and can take the sewage discharged from the sewage outlets along the river into the Inside the sewage interception pipe network;

Integrated enhanced treatment component, the integrated enhanced treatment component is positioned and buried under the ground on one side of the land direction at the front line of the primary revetment of the centralized sewage treatment area, and the sewage inlet of the integrated enhanced treatment component and the sewage interception pipe The outlet of the net is connected, and the drainage outlet of the integrated enhanced treatment component opens into the river; the integrated enhanced treatment component includes a hydrolysis acidification tank, a contact oxidation tank, a secondary sedimentation tank, and a disinfection tank, which are sequentially arranged and connected along the sewage inlet direction Pool; and

The ecological restoration component includes a number of diversion weirs located near the outlet of the integrated enhanced treatment component in the river channel. Based on the flow direction of the sewage body, a number of artificial ecological floats float on the surface of the water body in front of the diversion weir. Island, and artificial aquatic plants are located on the river bed in front of the diversion weir.
The sewage interception centralized treatment system for river treatment according to claim 1, characterized in that: the interception pipe network is composed of interconnected interception pipes, and the diameter of the interception pipe is not greater than 800mm; The interception pipes all include an inner pipe for collecting and transporting sewage and a sleeve coaxially positioned and sleeved on the inner pipe. Based on the use state, the upper surface of the outer wall of the sleeve is axially spaced apart. A plurality of hoisting hooks for hoisting are provided, and a plurality of positioning brackets for fixing the sleeve on the mounting substrate are fixedly spaced along the axial direction on the lower surface of the outer wall of the sleeve.
The sewage interception centralized treatment system for river treatment according to claim 1, characterized in that: the hydrolysis acidification tank, contact oxidation tank, secondary sedimentation tank and disinfection tank all include a water outlet located in the upper middle of the common side wall Connected tank bodies, in which the hydrolysis acidification tank and the bottom of the tank body contacting the oxidation tank are both positioned with a microporous aeration device capable of inflating the water body, and the two types of tank bodies located above the microporous aeration device are both located along the bottom Several rows of elastic fillers are arranged in the vertical direction; the bottom of the second settling tank has a tapered structure, and the angle between the generatrix of the tapered structure and the axis is not greater than 40°, and the second settling tank is positioned with Annular water collection device; the top of the disinfection tank is positioned with a reagent dispensing device for dispensing disinfectant.
The centralized sewage interception treatment system for river treatment according to claim 3, characterized in that: a sludge pump for pumping sludge from the bottom of the pond is positioned in the hydrolysis acidification tank or the contact oxidation tank. The discharge port of the sludge pump is in communication with the feed port of a sludge drying bed; at least one sewage pump for extracting the treated sewage is positioned in the disinfection tank, and the outlet of the sewage pump is through a water outlet pipe Connected with the river.
The sewage interception centralized treatment system for river treatment according to claim 1, characterized in that: a plurality of the diversion weirs are sequentially arranged on the river slope on the side of the first-level barge front line in the direction of the water area, and each Each of the diversion weirs is composed of a diversion channel and a filter filler filled in the diversion channel, and the longitudinal section of the diversion weir is a trapezoidal structure.
The sewage interception centralized treatment system for river treatment according to claim 1, wherein the artificial ecological floating island comprises an island body that is positioned and floated on the surface of the water body by a heavy object method and is located near the center line of the river. The island body is planted with aquatic plants with a well-developed root system at a planting density interval of 15-20 trees/m 2 , and the bottom end of the root system of the aquatic plant is lower than the lowest water level of the river channel.
The sewage interception centralized treatment system for river treatment according to claim 1, wherein the artificial waterweed includes a plurality of artificial waterweed units, and each artificial waterweed unit includes a tether, and one end of the tether is fixed. An artificial aquatic herb body is provided, and the other end of the tether is fixed in a submerged block; the artificial aquatic herb includes a sinker fixedly connected to one end of the tether and in a strip shape, and the sinker is fixedly provided with Several fibrous biofilm carriers are arranged in parallel and upright, and a float is formed on the top of each biofilm carrier.
The sewage interception centralized treatment system for river treatment according to claim 7, characterized in that: a plurality of said artificial aquatic plants are arranged on the river bed of the natural substrate at a density of 9-12 roots/m 2; the artificial plants or several unit blocks submerged in accordance 9-12 root / m 2, a density interval laid embedded in geogrid chamber, the geocell other cultivated soil backfill solid septal cells can be provided with a plurality Anchor rods inserted on the river bed of the flexible soil foundation.
A centralized sewage interception treatment method for river treatment based on the sewage interception centralized treatment system according to any one of claims 1 to 8, characterized in that it comprises the following steps:

S1: Analyze the pollution source, and investigate the sewage outlets along the river course and analyze the collected water volume of the sewage outlets; based on the above-mentioned pollution source analysis and the results of the sewage collection water quantity analysis, a sewage interception pipe network is arranged on the side of the current river mouth towards the land area to make The water inlet of the sewage interception pipe network is connected with the sewage outlets along the river, and the sewage discharged from the sewage outlets along the river is included in the sewage interception pipe network;

S2: The sewage from the outlet of the sewage interception pipe network enters the integrated enhanced treatment module through the sewage inlet of the integrated enhanced treatment module, and flows through the hydrolysis acidification tank, contact oxidation tank, secondary sedimentation tank and disinfection tank in sequence. The treated sewage is discharged into the river channel from the outlet of the integrated enhanced treatment module by the sewage pump, and the bottom sludge extracted by the sludge pump is treated by the sludge drying bed;

S3: The sewage discharged from the drainage outlet of the integrated enhanced treatment component flows through the diversion weir of the ecological restoration component in turn. The sewage is settled and filtered by the filter stone filler filled in the diversion weir, and then flows through the water body located in the river. The artificial ecological floating island in the upper half and the artificial aquatic plants located in the lower half of the river water body use the developed root system of aquatic plants planted on the artificial ecological floating island and the biofilm carrier set on the artificial aquatic plants to carry out the secondary biodegradation process of the sewage. , To complete the centralized treatment process of sewage discharge to the river.
The sewage interception centralized treatment method for river treatment according to claim 9, characterized in that: the diameter of each sewage outlet along the river connected with the sewage interception pipe network in step S1 is not greater than 800 mm; The inner pipe of the sewage interception pipe is a PVC pipe with a diameter of no more than 800mm, and the water velocity in the inner pipe is 5-5.5m/s, the water fullness of the inner pipe is 0.7-0.8, and the hourly variation coefficient is 6-6.5.