CN213924213U - Constructed wetland filler structure for reducing TP and BOD - Google Patents

Constructed wetland filler structure for reducing TP and BOD Download PDF

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Publication number
CN213924213U
CN213924213U CN202021473887.3U CN202021473887U CN213924213U CN 213924213 U CN213924213 U CN 213924213U CN 202021473887 U CN202021473887 U CN 202021473887U CN 213924213 U CN213924213 U CN 213924213U
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regeneration aggregate
concrete
aggregate layer
brick
layer
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王淼
李岩凌
周红波
何强
周少剑
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Bceg Resources Recycling Co ltd
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Bceg Resources Recycling Co ltd
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Abstract

The utility model relates to an artificial wetland filler structure for reducing TP and BOD, which comprises a water storage base layer, a concrete regeneration aggregate layer and a brick regeneration aggregate layer from bottom to top in sequence, wherein the sum of the thicknesses of the concrete regeneration aggregate layer and the brick regeneration aggregate layer is not less than 1000mm, and the thickness ratio of the concrete regeneration aggregate layer to the brick regeneration aggregate layer is 0.5-1.5; the concrete regeneration aggregate layer is made of processed and crushed building waste concrete, and the particle size of the concrete regeneration aggregate layer is 8-16 mm; the brick regeneration aggregate layer is prepared by directly processing and crushing building waste bricks without cleaning, and the particle size of the brick regeneration aggregate layer is 16-32 mm. The utility model discloses make the regeneration aggregate with concrete and brick in the building waste, with its filler structure layer as constructed wetland, make full use of concrete, brick regeneration aggregate filtering quality are good, the strong characteristics of adsorption capacity, effectively reduce the phosphorus-containing total amount and the biological oxygen demand in the sewage, reduce constructed wetland's construction and maintenance cost, realize treating waste with the waste.

Description

Constructed wetland filler structure for reducing TP and BOD
Technical Field
The utility model relates to an artificial wetland packs technical field, concretely relates to artificial wetland filler structure for reducing TP and BOD.
Background
In the process of urban rapid development, due to rapid development of industrial and agricultural production and continuous increase of population, the amount of waste water required to be discharged is continuously increased, and in addition, due to imperfection in supervision, a large amount of waste water is discharged into a river without being treated, so that the water quality in the river is seriously polluted, the ecological environment of a city is influenced, and the image of the city is greatly influenced. In recent years, the strength of urban water treatment is increased in all parts of China. The treatment of the water environment is mainly divided into two aspects, firstly, sewage and sludge are treated by building water environment facilities such as artificial wetlands, ecological parks and the like and utilizing the physical, chemical and biological synergistic effects of soil, artificial media, plants and microorganisms, and the other aspect is the comprehensive treatment of urban black and odorous water. The mechanism of artificial wetland cycle treatment and black and odorous water body treatment can not be separated from the processes of adsorption, detention, filtration, oxidation reduction, precipitation, microbial decomposition and conversion, and the use of the filler for water treatment is one of the common methods. The filler method is mainly used for water treatment engineering and plays two roles, namely the role of a medium for microorganisms and the filtering role of the filler. For sewage treatment, the action of microorganisms is mainly relied on, the rough surface of the filler is used as a medium for the growth of the microorganisms, and the larger the specific surface area is, the more beneficial the growth of the microorganisms is.
The water treatment is carried out by using the filler, and the common filler types comprise limestone broken stone, zeolite, ceramsite, volcanic rock and the like, wherein the specific surface area of the limestone broken stone is relatively small, and the zeolite, the ceramsite and the volcanic rock have the larger specific surface area. The fillers are mostly natural fillers, are limited by the reasons of large mining, processing and transportation costs of the natural fillers and large water treatment consumption, and cannot be used for large-scale construction of water environment facilities such as artificial wetlands.
The construction waste recycled aggregate has rich porous structure, compared with natural filler with higher price, the recycled aggregate has low price, rich pore structure, high porosity, large specific surface area, rich iron and aluminum elements and volcanic ash components, and the advantages make the recycled aggregate have application potential in the field of water treatment. The total amount of construction waste in our country can reach about 15.5 to 24 billions of cubic meters per year according to statistics, and the increase rate is continuously increased by more than 10% per year. At present, most of the construction wastes in China are directly transported to the outskirts for open-air stacking or landfill without treatment, and the stacking of ten thousand tons of construction wastes occupies about 670 and 1340 square meters of land. The disposal mode of the landfill type construction waste not only occupies a large amount of precious cultivated land for a long time, but also consumes a large amount of construction expenses such as expropriated land expenses, garbage clearing and transporting expenses and the like, and meanwhile, the loose and ash flying dust generated in the clearing and transporting process seriously influences the appearance environment of the city. The building waste recycled aggregate mainly comprises waste red bricks and waste concrete, the waste red bricks are mainly formed by high-temperature sintering, the internal structure is loose, the porosity is high, the specific surface area is large, and the waste concrete is used as a secondary forming material and also has the characteristic of large porosity. The construction waste recycled aggregate is used for the wetland system, so that the wetland filler cost is reduced, and a new direction is developed for the resource utilization of the construction waste. However, the construction waste recycled aggregate still has some differences from the traditional natural filler in the aspects of components, porosity and strength, and the research and study on the specific application mode, the engineering scale application and compounding scheme and the pollutant control efficiency of the practical engineering project of the construction waste recycled aggregate are lacked at present. In view of this, the utility model provides an artificial wetland filler structure for reducing TP and BOD.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it is anticipated that a constructed wetland filler structure for reducing TP and BOD is provided to solve the not enough that exists among the prior art, the to-be-solved technical problem of the utility model is realized through following technical scheme.
The artificial wetland filler structure for reducing TP and BOD is improved in that: the water storage base layer, the concrete regeneration aggregate layer and the brick regeneration aggregate layer are sequentially arranged from bottom to top, the thickness sum of the concrete regeneration aggregate layer and the brick regeneration aggregate layer is not less than 1000mm, and the thickness ratio of the concrete regeneration aggregate layer to the brick regeneration aggregate layer is 0.5-1.5; the concrete regeneration aggregate layer is made of processed and crushed building waste concrete, and the particle size of the concrete regeneration aggregate layer is 8-16 mm; the brick regeneration aggregate layer is prepared by directly processing and crushing building waste bricks without cleaning, and the particle size of the brick regeneration aggregate layer is 16-32 mm.
Preferably, the thickness of the water storage base layer is 100-300 mm.
Preferably, the crushing value of the concrete recycled aggregate layer is not more than 15%, the concrete recycled aggregate with the particle size of less than 8mm is not more than 2.5%, and the concrete recycled aggregate with the particle size of more than 16mm is not more than 0.3%.
Preferably, the porosity of the concrete regeneration aggregate layer is 40-60%, and the specific surface area is 4.5-5.5 multiplied by 104cm2/g。
Preferably, the apparent density of the concrete regeneration aggregate layer is 1.5-2.1g/cm3The bulk density is 0.5-1.0g/cm3
Preferably, the needle-shaped content of the concrete regeneration aggregate layer and the brick regeneration aggregate layer is not more than 5.7 percent, and the impurity content is not more than 0.21 percent.
The utility model discloses utilize concrete regeneration aggregate layer and brick regeneration aggregate layer TP (the total amount of containing phosphorus) and BOD (biological oxygen demand) that can purify the aquatic betterly, its leading cause lies in: the concrete regeneration aggregate layer and the brick regeneration aggregate layer have high void ratio and obvious adsorption effect, and the total phosphorus content and the biological oxygen demand in water are reduced by self adsorption of phosphorus-containing ions and biodegradable pollutants; second, the aggregate particles in the concrete regenerated aggregate layer and the brick regenerated aggregate layer containRich in Mg2+、Ca2+Plasma, which is easy to generate precipitation reaction with phosphorus-containing ions in water, thereby reducing the total phosphorus content in the water; and thirdly, the porous structures of the concrete regeneration aggregate layer and the brick regeneration aggregate layer provide more growth sites for microorganisms, and are beneficial to the exertion of the biological dephosphorization effect.
The utility model discloses make the regeneration aggregate with concrete and brick in the building waste, with its filler structure layer as constructed wetland, make full use of concrete, brick regeneration aggregate filtering quality are good, the strong characteristics of adsorption capacity, effectively reduce the phosphorus-containing total amount and the biological oxygen demand in the sewage, reduce constructed wetland's construction and maintenance cost, realize treating waste with the waste.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the drawings are, in order: 1. water storage base layer, 2, concrete regeneration aggregate layer, 3, brick regeneration aggregate layer, 4, water surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1:
referring to fig. 1, the improved artificial wetland filler structure for reducing TP and BOD is as follows: the water storage base layer comprises a water storage base layer 1, a concrete regeneration aggregate layer 2 and a brick regeneration aggregate layer 3 from bottom to top in sequence, the sum of the thicknesses of the concrete regeneration aggregate layer 2 and the brick regeneration aggregate layer 3 is not less than 1000mm, and the thickness ratio of the concrete regeneration aggregate layer 2 to the brick regeneration aggregate layer 3 is 0.5-1.5; the concrete regeneration aggregate layer 2 is made of processed and crushed building waste concrete, and the particle size of the concrete regeneration aggregate layer is 8-16 mm; the brick regeneration aggregate layer 3 is prepared by directly processing and crushing building waste bricks without cleaning, and has a particle size of 16-32 mm.
The TP purification test is carried out on the embodiment, the water quality of inlet water is poor in class V, the average concentration of TP inlet water is 0.43mg/L, and the concentration of TP in outlet water is 0.07mg/L on days 4-38; in a comparative test, the concentrations of TP in effluent of the ceramsite, the limestone and the volcanic rock are 0.23mg/L, 0.18mg/L and 0.32mg/L respectively. On the 39 th-55 th day, the quality of the inlet water is first-grade B, the average concentration of TP inlet water is 1.04mg/L, and the concentration of TP in the outlet water is 0.26 mg/L; in a comparative test, the concentrations of TP in effluent of the ceramsite, the limestone and the volcanic rock are 0.81mg/L, 0.78mg/L and 0.86mg/L respectively. Therefore, the total phosphorus content in the water can be well reduced by the embodiment.
The BOD purification test is carried out on the embodiment, the inlet water quality is poor V type on days 4-38, the average BOD inlet water concentration is 13.39mg/L, and the BOD concentration in the outlet water is 4.01 mg/L; in a comparative test, the BOD concentrations of the effluent of the ceramsite, the limestone and the volcanic rock are respectively 4.72mg/L, 6.19mg/L and 7.76 mg/L. On the 39 th-55 th day, the inlet water quality is first grade B, the average BOD inlet water concentration is 15.55mg/L, and the BOD concentration in the outlet water is 1.00 mg/L; in a comparative test, the BOD concentrations of the effluent of the ceramsite, the limestone and the volcanic rock are respectively 0.94mg/L, 1.20mg/L and 1.56 mg/L. Therefore, the embodiment can better reduce the biological oxygen demand in water.
The present embodiment can reduce TP and BOD in water well, and the main reasons for this are: the concrete regeneration aggregate layer and the brick regeneration aggregate layer have high void ratio and obvious adsorption effect, and the total phosphorus content and the biological oxygen demand in water are reduced by self adsorption of phosphorus-containing ions and biodegradable pollutants; secondly, aggregate particles in the concrete regeneration aggregate layer and the brick regeneration aggregate layer contain rich Mg2+、Ca2+Plasma, which is easy to generate precipitation reaction with phosphorus-containing ions in water, thereby reducing the total phosphorus content in the water; and thirdly, the porous structures of the concrete regeneration aggregate layer and the brick regeneration aggregate layer provide more growth sites for microorganisms, and are beneficial to the exertion of the biological dephosphorization effect.
In the present embodiment, the brick-recycled aggregate layer 3 is prepared by directly processing and pulverizing waste building bricks, and has a particle size of 16 to 32mm without being subjected to a cleaning treatment. The reason for this is that in the comparative test, under the same conditions, the BOD effluent concentrations of the brick regeneration aggregate layer without being cleaned are respectively 4.11mg/L and 1.12mg/L, while the BOD effluent concentrations of the brick regeneration aggregate layer after being cleaned are respectively 4.60mg/L and 1.35mg/L, the BOD effluent concentrations of the brick regeneration aggregate layer with the grain diameter of 16-32mm are respectively 5.90mg/L and 2.27mg/L, and the BOD effluent concentrations of the brick regeneration aggregate layer with the grain diameter of 8-16mm are respectively 9.08mg/L and 3.02 mg/L. Namely, the comparison experiment can show that the effect of no cleaning is obviously better than the cleaning effect, and the effect of the particle size of 16-32mm is obviously better than the effect of the particle size of 8-16 mm.
When this embodiment uses, thereby lay retaining basic unit 1, the concrete regeneration aggregate layer 2, the brick regeneration aggregate layer 3 and form constructed wetland structure in proper order, 3 tops on the brick regeneration aggregate layer are the surface of water 4, the in-process of infiltration downwards of water, and concrete regeneration aggregate layer 2, the brick regeneration aggregate layer 3 begin to purify, adsorb to TP and BOD in the reduction aquatic.
Example 2:
on the basis of the embodiment 1, the thickness of the water impoundment base layer 1 is 100-300 mm.
Furthermore, the crushing value of the concrete recycled aggregate layer 2 is not more than 15%, the concrete recycled aggregate with the particle size of less than 8mm is not more than 2.5%, and the concrete recycled aggregate with the particle size of more than 16mm is not more than 0.3%.
Further, the porosity of the concrete regeneration aggregate layer 2 is 40-60%, and the specific surface area is 4.5-5.5 multiplied by 104cm2/g。
Further, the apparent density of the concrete regeneration aggregate layer 2 is 1.5-2.1g/cm3The bulk density is 0.5-1.0g/cm3
Furthermore, the needle-shaped content in the concrete regeneration aggregate layer 2 and the brick regeneration aggregate layer 3 is not more than 5.7 percent, and the impurity content is not more than 0.21 percent.
It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways, such as by rotating it 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.
In the foregoing detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a constructed wetland filler structure for reducing TP and BOD which characterized in that: the water storage base layer (1), the concrete regeneration aggregate layer (2) and the brick regeneration aggregate layer (3) are sequentially arranged from bottom to top, the thickness sum of the concrete regeneration aggregate layer (2) and the brick regeneration aggregate layer (3) is not less than 1000mm, and the thickness ratio of the concrete regeneration aggregate layer (2) to the brick regeneration aggregate layer (3) is 0.5-1.5; the concrete regeneration aggregate layer (2) is made of processed and crushed building waste concrete, and the particle size of the concrete regeneration aggregate layer is 8-16 mm; the brick regeneration aggregate layer (3) is prepared by directly processing and crushing building waste bricks without cleaning, and the particle size is 16-32 mm.
2. The constructed wetland packing structure for reducing TP and BOD of claim 1, wherein: the thickness of the water storage base layer (1) is 100-300 mm.
3. The constructed wetland packing structure for reducing TP and BOD of claim 1, wherein: the crushing value of the concrete recycled aggregate layer (2) is not more than 15%, the concrete recycled aggregate with the particle size of less than 8mm is not more than 2.5%, and the concrete recycled aggregate with the particle size of more than 16mm is not more than 0.3%.
4. The constructed wetland packing structure for reducing TP and BOD of claim 1, wherein: the porosity of the concrete regeneration aggregate layer (2) is 40-60%, and the specific surface area is 4.5-5.5 multiplied by 104cm2/g。
5. The constructed wetland packing structure for reducing TP and BOD of claim 1, wherein: the apparent density of the concrete regeneration aggregate layer (2) is 1.5-2.1g/cm3The bulk density is 0.5-1.0g/cm3
6. The constructed wetland packing structure for reducing TP and BOD of claim 1, wherein: the needle-shaped content of the concrete regeneration aggregate layer (2) and the brick regeneration aggregate layer (3) is not more than 5.7 percent, and the impurity content is not more than 0.21 percent.
CN202021473887.3U 2020-07-23 2020-07-23 Constructed wetland filler structure for reducing TP and BOD Active CN213924213U (en)

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CN202021473887.3U CN213924213U (en) 2020-07-23 2020-07-23 Constructed wetland filler structure for reducing TP and BOD

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Application Number Priority Date Filing Date Title
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