CN112358056A - Artificial wetland system for treating wastewater containing antibiotics - Google Patents
Artificial wetland system for treating wastewater containing antibiotics Download PDFInfo
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- CN112358056A CN112358056A CN202011240304.7A CN202011240304A CN112358056A CN 112358056 A CN112358056 A CN 112358056A CN 202011240304 A CN202011240304 A CN 202011240304A CN 112358056 A CN112358056 A CN 112358056A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/20—Total organic carbon [TOC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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Abstract
The invention discloses an artificial wetland system for treating wastewater containing antibiotics, which comprises a water distribution area, a matrix area and a water outlet area, wherein the water distribution area and the water outlet area are respectively arranged at two sides of the matrix area; cobblestones are arranged in the water distribution area and the water outlet area. The constructed wetland system has the advantages of simple structure, low cost and low energy consumption, has good denitrification and dephosphorization effects, and has better treatment effect on livestock and poultry wastewater containing sulfonamide antibiotics.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to an artificial wetland system for treating wastewater containing antibiotics.
Background
In recent years, artificial wetlands as an ecological treatment mode have been widely applied to rural domestic sewage treatment. Considering that the concentration of organic matters is a main limiting factor of the COD removal effect of the tidal flow, a novel tidal flow artificial wetland small test is constructed by simulating the intermittent discharge characteristic of rural domestic sewage in the prior art, and the influence of the hydraulic load on the treatment efficiency of typical artificial wetland purification river sewage is researched.
Meanwhile, the abuse problem of antibiotics is increasingly serious, and a large amount of antibiotics and derivatives thereof are left in the environment and enter a food chain, so that the food safety is influenced, and the human health is harmed.
The patent document of application No. 201820211192.4 discloses a simulated surface flow wetland reactor, which comprises a tank body, a water collection partition plate and a water distribution partition plate, wherein the water collection partition plate separates the tank body and enables one end of the tank body to form a water collection tank, a water outlet and a water collection pipe are arranged outside the water collection tank, the water distribution partition plate is perpendicular to the water collection partition plate, the water distribution partition plate divides the tank body into a plurality of communicated galleries, two adjacent galleries form a U-shaped flow pool at the communicated part, the water collection partition plate is provided with a water inlet at the water inlet end, the water inlet is connected with a water distribution pipe, the water collection partition plate is provided with an overflow trough surface at the water outlet end, and a bottom substrate easily forms short flow; the technology belongs to a surface flow constructed wetland, the COD value of sewage treated by the system cannot be too high, pretreatment is needed, blockage is easy to cause, and the occupied area is large.
Patent document No. 201510929927.8 discloses an alternative anti-blocking constructed wetland and application thereof in organic rice irrigation, and specifically discloses a regulating pond for collecting rainwater and agricultural decentralized sewage and an artificial wetland reactor, wherein: the regulating pond for collecting rainwater and agricultural dispersed sewage is built at the upstream of the pipe arranging system of the organic rice planting area, and the organic planting area is built at the downstream of the artificial wetland reactor. The alternating anti-blocking constructed wetland reactor which enables water inlet and water outlet to alternately operate under the control of the gate valve is developed for avoiding the problem that the constructed wetland filler is easily blocked due to layered arrangement, but the reactor has the defects of complex equipment, complicated and unstable control and extremely limited antibiotic removal amount in wastewater.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an artificial wetland system for treating wastewater containing antibiotics, and solves the problems that the artificial wetland system in the prior art has poor antibiotic treatment effect, needs pretreatment, is easy to block and the like.
The technical scheme of the invention is as follows:
an artificial wetland system for treating wastewater containing antibiotics comprises a water distribution area, a substrate area and a water outlet area, wherein the water distribution area and the water outlet area are respectively arranged at two sides of the substrate area, a water inlet baffle is arranged between the water inlet area and the substrate area, a water outlet baffle is arranged between the substrate area and the water outlet area, the substrate area is of a layered structure and is respectively a first substrate area, a second substrate area and a third substrate area, and the first substrate area, the second substrate area and the third substrate area are sequentially arranged from top to bottom; cobblestones are arranged in the water distribution area and the water outlet area; canna plant is planted in the substrate area.
Preferably, the substrate zones are stacked to form a reactor having an overall height equal to the sum of the height of the first substrate zone, the height of the second substrate zone and the height of the third substrate zone.
Preferably, the height of the water distribution area is equal to that of the first substrate area, the length of the water distribution area is equal to the width of the reactor, and the width of the water distribution area is half of the length of the water distribution area.
Preferably, the water inlet baffle and the water outlet baffle both adopt a triangular weir overflow form.
Preferably, the water inlet baffle is arranged between the first matrix area and the water distribution area of the reactor, the water outlet baffle is arranged between the first matrix area and the water outlet area of the reactor, and preferably, the height of the water inlet baffle and the height of the water outlet baffle are both arranged between 5cm and 8 cm.
Preferably, the artificial wetland system is a horizontal subsurface flow artificial wetland, wherein the first substrate area, the second substrate area and the third substrate area adopt quartz sand with different grain diameters as fillers.
Preferably, the first matrix region has a particle size in the range of 0.2 to 0.4 mm; the particle size of the second matrix area ranges from 0.4mm to 0.6 mm; the third matrix region has a particle size in the range of 0.9 to 2.0 mm.
Preferably, the permeability coefficient of the first matrix region, the second matrix region and the third matrix region is 26md in sequence-1、36m-1And 64md-1。
Preferably, canna is planted on the upper surface of the first substrate area, namely in the upper quartz sand, with the planting interval being 20 +/-3 cm.
Compared with the prior art, the invention has the advantages that:
the constructed wetland system for treating the wastewater containing the antibiotics belongs to a horizontal subsurface flow constructed wetland, adopts a layered structure, makes a flow field uniform, improves the purification effect of the system, and is not easy to block; the canna is used as vegetation, under the structure designed by the invention, the antibiotic-containing wastewater is effectively treated, and the phenomenon that the antibiotic directly flows into the water outlet from the surface layer without passing through the intermediate filler does not occur, so that the nitrogen and phosphorus removal effect is good, the treatment effect on the livestock wastewater containing sulfonamide antibiotics is better, and the removal rate of the sulfonamide antibiotics reaches more than 95 percent; the constructed wetland system for treating the wastewater containing the antibiotics has the advantages of simple structure, low cost and low energy consumption; the construction and operation cost is low, the maintenance is simple and easy, and the impact on the hydraulic power and pollution load can be buffered; can produce environmental benefit and landscape value.
Drawings
Fig. 1 is a schematic structural view of an artificial wetland system for treating wastewater containing antibiotics according to an embodiment of the invention.
In the figure: 1. the water distribution area 2, the first substrate area 3, the second substrate area 4, the third substrate area 5, the water outlet area 6, canna, 7, a sewage source 8 and cobblestones.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the constructed wetland system device for treating wastewater containing antibiotics comprises a water distribution area 1, a substrate area and a water outlet area 5, wherein the water distribution area 1 and the water outlet area 5 are respectively arranged at two sides of the substrate area, a water inlet baffle is arranged between the water distribution area 1 and the substrate area, a water outlet baffle is arranged between the substrate area and the water outlet area 5, the substrate area is of a layered structure and is divided into an upper layer, a middle layer and a lower layer, and the layered structure is formed to be beneficial to uniform water flow. Specifically, the substrate area includes a first substrate area 2, a second substrate area 3, and a third substrate area 4, and the first substrate area 2, the second substrate area 3, and the third substrate area 4 are sequentially disposed from top to bottom. Wherein, canna 6 vegetation is planted in the substrate area. The substrate zones are stacked to form a reactor having an overall height equal to the sum of the height of the first substrate zone 2, the height of the second substrate zone 3 and the height of the third substrate zone 4. Wherein, the height of the water distribution area 1 is equal to that of the first substrate area 2, the length of the water distribution area 1 is equal to the width of the reactor, and the width of the water distribution area 2 is half of the length of the water distribution area.
The phenomena of channeling, short flow and dead zones commonly exist in the application process of the conventional artificial wetland system, the hydraulic characteristics in the artificial wetland matrix are reduced, the utilization rate of the matrix is low, and the application effect of the artificial wetland system is further limited. According to the invention, the three-layer structure of the substrate area is arranged from the arrangement of the water distribution area, the water outlet area and the substrate area of the artificial wetland system, the length, height and width ratios among the structures and the optimization of the thickness of the substrate area improve the hydraulic characteristics in the artificial wetland substrate.
In the layered structure of this embodiment, the third substrate zone 4 is further provided with aeration pipes (not shown), and aeration holes are arranged every 20 cm, so that the arrangement is more favorable for preventing the system from being blocked, and the phenomenon that water flows into the water outlet position directly from the surface layer without passing through the intermediate filler can be avoided, and pollutants such as antibiotics can be taken away. The arrangement of the aeration pipe enables the flow field distribution to be more uniform, and the effect of removing antibiotics is improved.
In the constructed wetland system, the vegetation is an important component, canna has tenacious vitality and is suitable for the environmental survival of the constructed wetland system, canna is adopted as the vegetation in the embodiment, and a matrix structure and a filler which are suitable for the growth and development of the root system are adopted, so that the canna has favorable influence on the hydraulic characteristic of the constructed wetland system, antibiotics in wastewater are effectively removed under the structural arrangement of the constructed wetland system, and the removal effect is obviously higher than that of the constructed wetland system taking canna as the vegetation in the prior art.
Before and after canna is planted in the artificial wetland system, the tracer tests in the artificial wetland system show that the artificial wetland system with the layered filling structure can improve the hydraulic characteristic, effectively reduce the existence of short flow channels and 'dead zones', and improve the hydraulic efficiency of the system; the artificial wetland system with the single-layer filling structure has more short flow channels and dead zones, the utilization rate of the matrix is low, and the effective volume ratio of the artificial wetland system without plants is 49 percent and is far lower than 87 percent of the effective volume ratio of a reasonable grading layered filling mode.
Furthermore, the water inlet baffle and the water outlet baffle both adopt a triangular weir overflow form. The water inlet baffle is arranged between the first matrix area 2 and the water distribution area 1 of the reactor, the water outlet baffle is arranged between the first matrix area 2 and the water outlet area 5 of the reactor, and the height of the water inlet baffle and the height of the water outlet baffle are both 5cm-8 cm. The baffle that intakes adopts triangle weir overflow form to play the cushioning effect, avoids rivers impact to cause destruction to the matrix layer, and the baffle that goes out adopts triangle weir overflow form also can reach the cushioning effect, prevents that the matrix layer from running off along with rivers.
Furthermore, the artificial wetland system is a horizontal subsurface flow artificial wetland, wherein the first substrate area 2, the second substrate area 3 and the third substrate area 4 adopt quartz sand with different grain diameters as filler, canna 6 is planted on the upper surface of the first substrate area 2, namely in the upper layer of quartz sand, and the planting interval is 20 +/-3 cm; the first matrix region 2 has a particle size in the range of 0.2-0.4mm, the second matrix region 3 has a particle size in the range of 0.4-0.6mm, and the third matrix region 4 has a particle size in the range of 0.9-2.0 mm. The filling degree of the canna root system in the artificial wetland system is favorable for improving the hydraulic conductivity of the artificial wetland system.
Preferably, the permeability coefficient of each matrix layer is 26md from top to bottom-1、36m-1And 64md-1The layered structure forms a uniform flow field, and the treatment effect of the system is improved.
Preferably, cobblestones 8 are arranged in the water distribution area 1 and the water outlet area 5, and water inlet is buffered by the cobblestones 8, so that the reactor is prevented from being greatly impacted; the reactor may be referred to as a system of reactors. The cobblestones 8 arranged in the water outlet area 5 also have the function of reducing impact, and meanwhile, the discharged water is filtered through the cobblestones 8. Preferably, the cobblestones 8 have a diameter of 3-5cm, and further, the cobblestones 8 have a diameter of 4 cm.
The detection of the wastewater treatment effect of the constructed wetland system for treating wastewater containing antibiotics comprises the following steps:
detecting the quality of inlet water from a sewage source 7 at the water inlet end of the system, wherein the total organic carbon TOC is 120mg/L, the total nitrogen TN is 30mg/L and the total phosphorus TP is 6mg/L in the wastewater; the water quality after the treatment of the water outlet end is detected and calculated, and the removal rates of the constructed wetland system to the total organic carbon, the total nitrogen and the total phosphorus are respectively 88.7 percent, 94.1 percent and 98.4 percent. Through analysis and comparison, the constructed wetland system adopting the structure of the invention has generally higher removal capability on conventional pollutants.
Through the detection of the purification effect of the artificial wetland system, the concentration of pollutants from the water inlet end to the water outlet end is as follows: the concentration of the water inlet end is equal to the concentration of the middle sampling port, and the concentration of the water outlet end is equal to the concentration of 80%, the concentration of the visible pollutants is gradually decreased along the way, and the system purification mode mainly adopts horizontal plug-flow type degradation from the change law of the various conventional pollutants along the way, and has the advantages of uniform and smooth layering and good removal effect. The uniform flow field formed by the layered structure of the artificial wetland system plays a decisive role in the removal effect of antibiotics, and compared with an unstratified wetland system, the treatment effect of the uniform flow field on three antibiotics of quinolones, sulfonamides and tetracyclines is good. Furthermore, the system has the highest treatment effect of the sulfonamide antibiotics on three antibiotics of quinolone type, sulfonamide type and tetracycline type, and the treatment effect reaches more than 95%, but the treatment effect which is not seen in the prior art can reach more than 90%.
The artificial wetland system which takes canna as vegetation in the prior art but is different from the layered structure of the invention is taken as a comparative example, the same sewage is introduced from the water inlet end for treatment as the artificial wetland system of the embodiment, the effluent water at the water outlet end is collected and detected, the antibiotic removal of the comparative example is less than 90%, and the antibiotic removal of the embodiment reaches 98%.
In the prior art, emergent aquatic plants such as reed, zizania latifolia, cattail, phyllostachys edulis, pennisetum hydridum, scirpus purpureus, scirpus tabescens and the like are taken as vegetation, the same layered structure and the filler of the artificial wetland system are taken as a comparative example, the artificial wetland system is introduced with the same sewage from the water inlet end for treatment, the effluent from the water outlet end is collected and detected, the optimal effect of removing antibiotics in each proportion can reach 92-95%, and the removal rate is generally lower than that of 98% in the embodiment.
The device disclosed by the invention has the advantages of simple structure, low cost and low energy consumption, has a good nitrogen and phosphorus removal effect, and has a better treatment effect on livestock and poultry wastewater containing the sulfonamide antibiotics, for example, in a slaughterhouse, the device not only can treat the wastewater containing the sulfonamide antibiotics, but also can improve the landscape value of the system.
The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
Claims (9)
1. The constructed wetland system for treating wastewater containing antibiotics is characterized by comprising a water distribution area, a matrix area and a water outlet area, wherein the water distribution area and the water outlet area are respectively arranged at two sides of the matrix area, a water inlet baffle is arranged between the water inlet area and the matrix area, a water outlet baffle is arranged between the matrix area and the water outlet area, the matrix area is of a layered structure and is respectively a first matrix area, a second matrix area and a third matrix area, and the first matrix area, the second matrix area and the third matrix area are sequentially arranged from top to bottom; cobblestones are arranged in the water distribution area and the water outlet area; canna plant is planted in the substrate area.
2. The constructed wetland system for treating wastewater containing antibiotics of claim 1, wherein each substrate zone is stacked to form a reactor, and the total height of the reactor is equal to the sum of the height of the first substrate zone, the height of the second substrate zone and the height of the third substrate zone.
3. The constructed wetland system for treating wastewater containing antibiotics of claim 2, wherein the height of the water distribution zone is equal to the height of the first substrate zone, the length of the water distribution zone is equal to the width of the reactor, and the width of the water distribution zone is half of the length of the water distribution zone.
4. The constructed wetland system for treating wastewater containing antibiotics of claim 3, wherein the water inlet baffle and the water outlet baffle are both in a triangular weir overflow form.
5. The constructed wetland system for treating wastewater containing antibiotics of claim 4, wherein the water inlet baffle is arranged between the first substrate area and the water distribution area of the reactor, the water outlet baffle is arranged between the first substrate area and the water outlet area of the reactor, and the height of the water inlet baffle and the height of the water outlet baffle are both arranged between 5cm and 8 cm.
6. The constructed wetland system for treating wastewater containing antibiotics of claim 5, which is a horizontal subsurface constructed wetland, wherein the first substrate area, the second substrate area and the third substrate area adopt quartz sand with different grain diameters as fillers.
7. The constructed wetland system for treating wastewater containing antibiotics according to claim 6, characterized in that the particle size of the first substrate zone is in the range of 0.2-0.4 mm; the particle size of the second matrix area ranges from 0.4mm to 0.6 mm; the third matrix region has a particle size in the range of 0.9 to 2.0 mm.
8. The constructed wetland system for treating wastewater containing antibiotics of claim 7, wherein the permeability coefficient of the first substrate area, the second substrate area and the third substrate area is 26md in sequence-1、36m-1And 64md-1。
9. The artificial wetland system for treating wastewater containing antibiotics according to claim 8, characterized in that canna is planted on the upper surface of the first substrate area, i.e. in the upper quartz sand, at intervals of 20 ± 3 cm.
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2020
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