CN-121974498-A - Assembled composite constructed wetland system and method

CN121974498ACN 121974498 ACN121974498 ACN 121974498ACN-121974498-A

Abstract

The invention discloses an assembled composite constructed wetland system and method in the technical field of water treatment, wherein the assembled composite constructed wetland system comprises a main body frame, a subsurface wetland module, an up-flow deep-bed composite biological filter and an integrated process intelligent water distribution system, the main body frame comprises a supporting structure, a grid and a bottom supporting structure, the grid divides the interior of the main body frame into an upper layer and a lower layer, the subsurface wetland module and the up-flow deep-bed composite biological filter are respectively arranged on the upper layer and the lower layer of the main body frame, the up-flow deep-bed composite biological filter forms a multi-level structure along the water inlet direction, the integrated process intelligent water distribution system is arranged in the main body frame, the main body frame adopts a structural ecological design, compared with the traditional concrete/steel-concrete tank structure, the energy consumption in the construction process is lower, the treatment system adopts novel environment-friendly functional materials, and is suitable for ecological restoration of river/landscape water, municipal tail water extraction and recycling, cultivation wastewater and agricultural non-point source pollution treatment.

Inventors

SUN YONGJIAN
CHENG FANG
LUO QIAOLING

Assignees

南京领先环保技术股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260324

Claims (9)

1. An assembled composite constructed wetland system, which is characterized in that: comprises a main body frame (1), a subsurface flow wetland module (2), an upward flow deep bed composite biological filter (3) and an integrated process intelligent water distribution system (4); the main body frame (1) comprises a supporting structure (11), a grid (12) and a bottom supporting structure (13), the grid (12) divides the interior of the main body frame (1) into an upper layer and a lower layer, and the bottom supporting structure (13) is arranged to be an inclined structure along the water inlet direction; The subsurface flow wetland module (2) and the upstream deep flow bed composite biological filter (3) are respectively arranged on the upper layer and the lower layer of the main body frame (1), are longitudinally overlapped and are separated by the grid (12); the up-flow deep-bed composite biological filter (3) sequentially forms a multi-level hierarchical structure along the water inlet direction; The integrated process intelligent water distribution system (4) is positioned inside the main body frame (1) and comprises a water inlet distribution system (41), a grading water distribution system (5) in the subsurface flow wetland module (2) and an integrated process pipeline system (6) for microbial agent supplementation, carbon source supplementation, aeration, back flushing and sludge discharge systems in the up-flow deep-bed composite biological filter (3).
2. The assembled composite constructed wetland system according to claim 1, wherein said supporting structure (11) comprises, in order from inside to outside, a plastic-wood board (111), an impermeable layer (112) and a plastic-steel sheet pile (113); square pipe steel piles (114) are arranged on the surface of the plastic-wood board (111); The grid (12) is a glass fiber reinforced plastic grid plate, and the periphery of the grid is anchored on the supporting structure (11); the bottom supporting structure (13) is a plastic bottom plate, a glass fiber reinforced plastic bottom plate or a pouring bottom plate, an impermeable layer is arranged on the outer side of the bottom supporting structure, and the impermeable layer is welded with the impermeable layer in the supporting structure (11); A compact sand cushion layer is arranged below the bottom supporting structure (13) and the outer impermeable layer; The bottom supporting structure (13) is arranged to be 5-10 degrees inclined angle along the water flow direction, and the lower end of the bottom supporting structure is positioned at the water outlet end of the assembled composite constructed wetland system so as to be beneficial to realizing the water collecting and backflow functions of the assembled composite constructed wetland system.
3. The assembled composite constructed wetland system according to claim 1, wherein the interior of the subsurface flow wetland module (2) is filled with an environment-friendly functional material, namely a modified biomass charcoal dephosphorization filler; The paving thickness of the packing layer is 40-80 cm; The filler layer is composed of a plurality of layers of modified biomass charcoal dephosphorization fillers, and the particle size of each layer of filler is gradually reduced from bottom to top.
4. The assembled composite constructed wetland system according to claim 1, wherein the height of the tank body of the up-flow deep-bed composite biological filter (3) is 3-4m, the water depth in the tank is 2-3m, and a plurality of treatment units are separated from the filter by a plurality of partition walls (31); The inside of the up-flow deep-bed composite biological filter (3) is filled with biological synergistic biomass charcoal-based filler serving as a slow-release carbon source and a microorganism growth carrier, and sewage sequentially flows through the multistage treatment units along the water inlet direction; the multistage treatment unit at least comprises an aerobic tank and 2-3 denitrification tanks or comprises 3-4 synchronous nitrification and denitrification tanks.
5. The assembled composite constructed wetland system according to claim 1, wherein the water inlet distribution system (41) is positioned at the water inlet end of the assembled composite constructed wetland system and is respectively communicated with the water inlet pipelines of the subsurface flow wetland module (2) and the up-flow deep-bed composite biological filter (3).
6. The assembled composite constructed wetland system according to claim 1, wherein the grading water distribution system (5) is arranged inside the subsurface flow wetland module (2) and above the upflow deep bed composite biological filter (3), and comprises a bottom supporting layer (51), a bottom water distribution layer (52), a water distribution power device and a top water collection layer (54); A grading water distribution pipe is arranged in the bottom water distribution layer (52), and comprises a main pipe and a plurality of branch pipes; the main pipe is arranged along the length direction of the wetland unit, and the plurality of branch pipes are connected with the main pipe and are distributed along the transverse direction; The bottom supporting layer (51) consists of a plurality of layers of gravels, and the particle size of each layer of gravels gradually decreases from bottom to top; the top water collecting layer (54) comprises a perforated water collecting pipe and a water level regulator, and is communicated with an upstream deep-bed composite biological filter water inlet pipeline (7) through a pipeline; the water distribution power device comprises a lifting pump and a pulse generator, and continuous or intermittent water distribution is realized.
7. The assembled composite constructed wetland system according to claim 1, wherein said integrated process piping system (6) comprises a water inlet pipe (7), a dosing pipe (61), an aeration pipe (62) and a sludge discharge pipe (63); The water inlet pipeline (7) and the dosing pipeline (61) are arranged above the upstream deep-bed composite biological filter (3); the dosing pipeline (61) of each stage of processing unit is communicated with the water inlet pipeline (7); The aeration pipeline (62) and the sludge discharge pipeline (63) are arranged at the bottom of the up-flow deep-bed composite biological filter (3) and are positioned above the bottom supporting structure (13).
8. The assembled composite constructed wetland system according to claim 1, wherein said up-flow deep-bed composite biological filter (3) comprises a 3-4-stage biological filter; The water inlets of the biological filters of each level are provided with a flow-through pipe (8); One end of a flow pipe (8) of the first-stage biological filter is communicated with a water inlet pipe (7), and the other end of the flow pipe is communicated with the bottom of the first-stage biological filter; One end of a flow pipe (8) of the second-stage biological filter is communicated with the upper end of the first-stage biological filter, and the other end of the flow pipe is communicated with the bottom of the second-stage biological filter; the third-stage biological filter and the fourth-stage biological filter are internally provided with a flow-through pipe (8); The main body frame (1) is provided with a water outlet (9) at one side of the final biological filter.
9. A method of assembling a composite constructed wetland, applied to the assembled composite constructed wetland system of any one of claims 1 to 8, comprising: pumping sewage to be treated into an artificial wetland system through a water inlet distribution system (41), and dividing the sewage into two paths by the water inlet distribution system (41); The first path of sewage enters the subsurface flow wetland module (2) through the grading water distribution system (5) of the subsurface flow wetland module (2), and enters the water inlet pipeline (7) of the upstream deep-bed composite biological filter through the top water collecting layer (54); the sewage of the second path directly enters an upstream deep-bed composite biological filter water inlet pipeline (7); the two paths of sewage flow through each level of biological filter after being converged in the upstream deep-bed composite biological filter (3) in sequence, and the water flow direction of each level of biological filter is from bottom to top; The treated water flows out from the final biological filter and is discharged through a water outlet (9).

Description

Assembled composite constructed wetland system and method Technical Field The invention relates to an assembled composite constructed wetland system and method, and belongs to the technical field of water treatment. Background Along with the acceleration of the urban process and the continuous improvement of the intensity of industrial and agricultural activities, the problems of accumulation of organic pollutants, nitrogen and phosphorus nutritive salts and heavy metals in river, lake and landscape water bodies are commonly caused, the environmental problems of eutrophication, black and odorous water bodies and the like are easily caused, the stability of an ecological system is influenced, and the living environment of residents and the safety of water resources are also adversely affected. Compared with the traditional sewage treatment technology, the artificial wetland technology has the advantages of strengthening the natural restoration process, being small in environmental disturbance, being capable of cooperatively removing suspended particles, being easy to biodegrade and degrade various pollutants such as organic pollution and pathogens, being lower in energy consumption compared with a centralized sewage treatment system, and being widely applied to the technical field of water treatment in recent decades. The traditional constructed wetland technology comprises a single-flow-state constructed wetland technology and a combined constructed wetland technology, wherein the single-flow-state constructed wetland adopts a single structure such as a horizontal subsurface flow wetland, a vertical subsurface flow wetland or a surface flow wetland, has the characteristics of simple structure and low construction cost, but has short plates with large occupied area, low decontamination efficiency and poor dephosphorization/denitrification capability, and the system has weak adjustability and impact load resistance and is not suitable for high-standard treatment of complex water bodies. The combined constructed wetland generally adopts a combined configuration of vertical flow, horizontal flow, subsurface flow, surface flow, wetland and biological filter series/parallel connection, can realize the deep cooperative removal of pollutants, saves a part of occupied area compared with the single-flow constructed wetland, enhances the adjustability and impact load resistance of the system to a certain extent, and is suitable for deep treatment projects with complex water quality, large fluctuation and high requirement. The existing combined deep-bed (more than 2 meters) constructed wetland system is generally a concrete/steel-concrete tank body, and has the defects of long construction period, high construction cost, high energy consumption, independent operation of multiple units, poor coordination and complex operation and maintenance, so that higher investment cost is required in engineering construction and operation and maintenance management processes. In addition, the problems of low total nitrogen removal efficiency, large occupied area, unstable water output and short service life exist in both the single-flow-state constructed wetland technology and the combined constructed wetland technology. Along with the development of social economy, the water environment pollution problem is characterized by more complexity and severity, the problem of ecological degradation of river and lake water bodies caused by nitrogen and phosphorus and refractory organic pollutants frequently occurs, and the traditional constructed wetland technology has difficulty in meeting the requirement of ecological restoration of water bodies due to higher requirements on the water treatment technology of ecological restoration of polluted water bodies. The composite constructed wetland is designed in an integrated way, so that multiple purification processes can cooperate in a single structure or an integrated module, and the coupling of multiple purification mechanisms can be realized compared with the traditional constructed wetland technology. The existing composite constructed wetland technology has been proved to have better water quality purification effect, and the following steps are listed: the Chinese patent CN117228851A discloses a multistage composite constructed wetland system for purifying watershed water, which is used for improving sediment precipitation rate, purification efficiency and diapause flood peak capacity of the system in ecological ponds and constructed wetland areas formed by connecting three stages of ecological ponds in series. The invention patent CN 116375208A discloses an autotrophic denitrification constructed wetland system, which can solve the problems of insufficient carbon source and lower denitrification efficiency of the traditional constructed wetland system in rural small micro water body treatment through a filtering area, a first constructed wetland area and a second constructed wetland are