Modular constructed wetland for treatment of biogas slurry

Abstract

The application discloses a kind of modular constructed wetland for treating biogas slurry, comprising: total pool body, algal membrane processing unit and filtration processing unit;Wherein, algal membrane processing unit is arranged in the front half pool body in total pool body;Plant processing unit is arranged in the back half pool body in total pool body, the rear end outlet of algal membrane processing unit is communicated with the front end bottom inlet of filtration processing unit;The front end of total pool body is provided with water inlet pipe, and the water inlet pipe is communicated with the front end of algal membrane processing unit;The rear end of total pool body is provided with water outlet pipe, and the water outlet pipe is communicated with the rear end outlet of filtration processing unit.By algal membrane processing unit and filtration processing unit in turn in total pool body, modular design, facilitate construction and use, by algal membrane processing unit adsorption Mn, Mo, Ni, Gu, Co, Sn and other heavy metals and other organic pollutants, facilitate recovery algal strain;Filtering processing unit can play a good filtering effect, avoid to block constructed wetland.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of artificial wetlands, in particular to a modular artificial wetland for treating eutrophic sewage. BACKGROUND

[0002] Current biochemical treatment processes for biogas slurry include anoxic-oxic (A / O) activated sludge method, sequencing batch activated sludge (SBR) method, membrane bioreactor (MBR), and artificial wetland process. Among them, the biological membrane of the membrane bioreactor is a consumable and cannot recycle nutrients, and the artificial wetland process mainly adopts a mode simulating an ecological system to treat biogas slurry by using fillers, plants, microorganisms, and other complex wetland systems. This includes physical (adsorption, sedimentation, filtration), chemical (ion exchange), microbial (metabolism), and plant (plant growth) reactions, which can effectively remove pollutants and absorb excess nutrients in biogas slurry. Because of its low cost, the artificial wetland is often used as a common facility for treating rural sewage, but the artificial wetland usually adopts a brick or concrete structure, which requires a special construction team for construction, has a long construction period, poor flexibility, and difficult to solve the problem of clogging. The effect of ordinary artificial wetland plants and microorganisms on the treatment of eutrophic sewage such as biogas slurry is slightly insufficient.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] The present application provides a modular artificial wetland for treating biogas slurry, which is modular, easy to build, avoids clogging, and can effectively treat biogas slurry or microalgae sewage, thereby solving the above technical problems in the prior art.

[0005] The present application is achieved by the following technical solutions:

[0006] The present application provides a modular artificial wetland for treating biogas slurry, comprising:

[0007] a total pool body, an algae membrane treatment unit, and a filtration treatment unit; wherein,

[0008] the algae membrane treatment unit is arranged in the front half of the total pool body;

[0009] the plant treatment unit is arranged in the rear half of the total pool body, and the rear end outlet of the algae membrane treatment unit is in communication with the front end bottom inlet of the filtration treatment unit;

[0010] a water inlet pipe is arranged at the front end of the total pool body, and the water inlet pipe is in communication with the front end of the algae membrane treatment unit;

[0011] The rear end of the total pool body is provided with a water outlet pipe, which is communicated with the rear end outlet of the filtering treatment unit.

[0012] Compared with the prior art, the modular constructed wetland for treating biogas slurry has the following beneficial effects:

[0013] The algal membrane treatment unit and the filtering treatment unit are arranged in sequence in the total pool body, the modular design facilitates construction and use, the algal membrane treatment unit can adsorb heavy metals such as Mn, Mo, Ni, Gu, Co and Sn and other organic pollutants, and the algal strains (such as Scenedesmus and Chlorella) can be recycled, the algal strains can be used as raw materials for biodiesel and plant protein due to high contents of oil, protein and polysaccharide, the algal membrane treatment unit can be produced in a factory and cultivated in a laboratory, the constructed wetland is convenient to construct, does not leak and has small construction quantity, and the filtering treatment unit can play a good filtering role and avoid clogging the constructed wetland. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0015] Figure 1 The figure shows the schematic diagram of the modular constructed wetland for treating biogas slurry.

[0016] In the figure, 10 is a total pool body, 20 is an algal membrane treatment unit, 30 is a filtering treatment unit, 1 is a water inlet pipe, 2 is an algal membrane support, 3 is a lifting outlet, 4 is a plant water storage layer, 5 is a second filter layer, 6 is a first filter layer, and 7 is a water outlet pipe. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the specific contents of the present application; obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments, which does not constitute a limitation to the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without any creative effort are within the protection scope of the present application.

[0018] Firstly, the terms possibly used in the present application are explained as follows:

[0019] The term "and / or" means either one or both, for example, X and / or Y means three cases including "X", "Y" or "X and Y".

[0020] The terms "comprising", "containing", "including", "having" or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, the inclusion of a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article, etc.) should be interpreted as including not only the explicitly listed technical feature element, but also other technical feature elements not explicitly listed but known in the art.

[0021] The term "consisting of" means excluding any technical feature element not explicitly listed. If this term is used in a claim, the term will make the claim closed so that it contains no technical feature element other than those explicitly listed, except for impurities ordinarily associated with the recited technical feature element. If the term is only present in a certain clause of the claim, it only limits the explicitly listed elements in that clause, and the elements recited in other clauses are not excluded from the overall claim.

[0022] Unless otherwise defined or limited, the terms "mounting", "connected", "connecting", "fixed", and the like should be interpreted broadly, for example, as being either fixedly connected, or removably connected, or integrally connected; as being either mechanically connected, or electrically connected; as being directly connected, or indirectly connected via intervening medium; as being internal communication between two elements. The specific meaning of the above terms in this document can be understood by those of ordinary skill in the art according to the specific circumstances.

[0023] When a concentration, temperature, pressure, size, or other parameter is expressed as a numerical range, the numerical range should be understood to specifically disclose all ranges formed from any upper limit value, lower limit value, preferred value within the numerical range, regardless of whether the range is explicitly recited; for example, if the numerical range "2-8" is recited, the numerical range should be interpreted as including "2-7", "2-6", "5-7", "3-4 and 6-7", "3-5 and 7", "2 and 5-7", etc. Unless otherwise stated, the numerical ranges recited in this document include all integers and fractions within the numerical range, both the end values.

[0024] The terms "central", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of description and simplification of description, and do not mean that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting herein.

[0025] The modular constructed wetland for treating biogas slurry provided by the present application is described in detail below. The contents not described in detail in the embodiments of the present application belong to the prior art known to those skilled in the art. The specific conditions not specified in the embodiments of the present application are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. The reagents or instruments used in the embodiments of the present application are not specified by the manufacturer, and are all conventional products that can be purchased on the market.

[0026] As shown in Figure 1 The present application provides a modular constructed wetland for treating biogas slurry, comprising:

[0027] a total pool body, an algal membrane treatment unit and a filtration treatment unit; wherein,

[0028] The algal membrane treatment unit is arranged in the front half of the total pool body;

[0029] The filtration treatment unit is arranged in the back half of the total pool body, and the rear end outlet of the algal membrane treatment unit is in communication with the front end bottom inlet of the filtration treatment unit;

[0030] The front end of the total pool body is provided with a water inlet pipe, which is in communication with the front end of the algal membrane treatment unit;

[0031] The rear end of the total pool body is provided with a water outlet pipe, which is in communication with the rear end outlet of the filtration treatment unit.

[0032] In the above modular constructed wetland, the algal membrane treatment unit comprises:

[0033] a plurality of algal membrane supports and a pull-up type water outlet; wherein,

[0034] The plurality of algal membrane supports are arranged in the front half of the total pool body from front to back, and each algal membrane support is fixed on the front half of the total pool body by an anti-corrosion sealing rubber strip;

[0035] The pull-up type water outlet is arranged at the rear end of the front half of the total pool body.

[0036] The algae membrane support in the modular constructed wetland comprises:

[0037] A plate frame support on which algae membranes are arranged, the algae membranes being membranes formed by adherent culture of Scenedesmus and / or Chlorella;

[0038] The plate frame support is composed of a support arranged in a plastic plate frame.

[0039] The algae membrane support thus formed is convenient for factory production and installation in the total pool body, and can divide the total pool body into multiple treatment spaces, facilitating construction, shortening the construction period, reducing the cost, and facilitating replacement.

[0040] The filtration treatment unit in the modular constructed wetland comprises:

[0041] A first filter layer, a second filter layer, and a plant water storage layer; wherein,

[0042] The first filter layer, the second filter layer, and the plant water storage layer are sequentially arranged in the back half of the total pool body from bottom to top;

[0043] The front end of the first filter layer is provided with the front end bottom inlet;

[0044] The back end of the plant water storage layer is provided with the back end outlet.

[0045] The first filter layer in the modular constructed wetland is formed by volcanic rock particles with a particle size of 40-50 mm.

[0046] The second filter layer in the modular constructed wetland is sequentially arranged from bottom to top by a zeolite layer, a straw particle layer, and an oyster shell particle layer;

[0047] In the second filter layer, the raw materials in each layer are in a volume ratio of 70% zeolite, 20% straw particles, and 10% oyster shells; the particle size of the zeolite is 5-8 mm, the particle size of the straw particles is 8-10 mm, and the particle size of the oyster shell particles is 3-5 mm.

[0048] The first filter layer and the second filter layer thus formed cooperate to sequentially filter wastewater treated by the algae membrane treatment unit to different finenesses, remove different sizes of sundries, and avoid clogging the constructed wetland.

[0049] The plant water storage layer in the modular constructed wetland is composed of a light nutrient soil layer arranged on the second filter layer and a plurality of aquatic wetland plants planted in the light nutrient soil layer.

[0050] As can be seen from the above, the modular constructed wetland for treating biogas slurry in the embodiment of the application adopts the algal membrane treatment unit and the filtration treatment unit in sequence in the total pool body, adsorbs heavy metals such as Mn, Mo, Ni, Gu, Co and Sn and other organic pollutants through the algal membrane treatment unit, recycles algal strains (such as desmodesmus sp. and chlorella sp. due to high content of oil, protein and polysaccharide, which can be used as raw materials for biodiesel and plant protein), and the algal membrane treatment unit can be conveniently produced in a factory and batch produced in a laboratory for directional culture, so that the constructed wetland is convenient for overall construction, does not leak, and has small construction quantity. Specifically, the algal membrane support and the algal membrane support constituting the algal membrane treatment unit can be conveniently produced in a factory and batch produced in a laboratory for directional culture, so that the constructed wetland is convenient for overall construction, does not leak, and has small construction quantity. In terms of treatment effect, the removal rates of ammonium ions and phosphate ions in the biogas slurry can reach 95% and above 99% within four days, and the algal membrane treatment unit has very good adsorption effect on heavy metal ions such as Mn, Mo, Ni, Gu, Co and Sn in the biogas slurry. The N and P elements can be recycled by replacing the algal membrane, and the replaced algal membrane can be processed into algal protein additives for feed and extracted biodiesel. The overall constructed wetland can face high-nitrogen and high-phosphorus wastewater such as biogas slurry, and play a role in deep degradation and purification.

[0051] In order to more clearly show the technical solutions provided by the application and the technical effects generated, the modular constructed wetland for treating biogas slurry provided by the embodiment of the application is described in detail below with specific embodiments.

[0052] Embodiment

[0053] As shown in Figure 1 , the embodiment of the application provides a modular constructed wetland for treating biogas slurry, which is convenient for construction, fast, can recycle nutrients, and can deeply treat eutrophic wastewater such as biogas slurry, and the modular constructed wetland comprises:

[0054] The total pool body 10 is constructed by impervious pouring cement plus an impervious coating, and a composite plastic frame plate is arranged at the middle part of the total pool body 10 to divide the total pool body 10 into a front half pool body and a rear half pool body, a water inlet pipe 1 is arranged at the front end of the front half pool body, and a water outlet pipe 7 is arranged at the rear end of the rear half pool body;

[0055] The algae membrane processing unit 20 is arranged in the front half of the total pool body 10, and an inlet is arranged at the bottom of the algae membrane processing unit 20, which is communicated with the water inlet pipe 1 arranged at the front end of the total pool body. The algae membrane processing unit 20 is provided with a plurality of algae membrane supports which are arranged in the total pool body 10 by a plurality of plastic plate frames. The plastic plate frames are fixed in the total pool body 10 by being surrounded by corrosion-proof sealing rubber strips. The algae membrane supports 2 are formed by the supports arranged in each plastic plate frame. The algae membrane supports 2 can be pulled out to replace the algae membrane. Specifically, the algae membrane pieces (mainly composed of mixed adherent culture membrane pieces of desmodesmus and chlorella) are fixed on the supports. A pull-out type water outlet 3 is arranged at the rear end of the algae membrane processing unit 1. In order to facilitate the display of the internal structure, the pool body where the algae membrane processing unit 10 is arranged can be made into a perspective structure.

[0056] The filtration processing unit 30 is arranged in the rear half of the total pool body 10. The filtration processing unit 20 is sequentially provided with a first filter layer 6, a second filter layer 5 and a plant water storage layer 4 from bottom to top. An inlet is arranged at the front end of the first filter layer 6, which is communicated with the pull-out type water outlet 3 of the algae membrane processing unit 10. The first filter layer 6 is composed of volcanic rock particles with a particle size of 40-50 mm which are arranged at the bottom of the rear half of the pool body, serving as a base layer to ensure its excellent water permeability.

[0057] Zeolite layer, straw particle layer and oyster shell particle layer are arranged on the first filter layer 6 as the base layer to serve as the second filter layer 5. According to the volume ratio of the raw materials of each layer, the zeolite accounts for 70%, the straw particle accounts for 20% and the oyster shell accounts for 10%. The particle size of the zeolite is 5-8 mm, the particle size of the straw particle is 8-10 mm, and the oyster shell particle is obtained by crushing oyster shells and has a particle size of 3-5 mm.

[0058] Light nutrient soil layer is arranged on the second filter layer 5, and a plurality of aquatic wetland plants are planted in the light nutrient soil layer to serve as the plant water storage layer 4. A water outlet is arranged at the rear end of the plant water storage layer, which is communicated with the water outlet pipe 7 arranged at the rear end of the total pool body.

[0059] The above-mentioned modular constructed wetland for treating biogas slurry is characterized in that the biogas slurry enters the algae membrane processing unit 10 through the water inlet pipe 1, and the pull-out type outlet 3 is in a closed state. The biogas slurry is immersed in the algae membrane supports 2 to fully react for four days. After four days, the pull-out type outlet 3 is pulled open, so that the biogas slurry flows into the filtration processing unit 20 through the outlet. The biogas slurry treated by the algae membrane is sequentially filtered by the first filter layer 6 for preliminary filtration, the second filter layer 5 for further filtration and nitrogen and phosphorus removal, and finally immersed in the second filter layer 5 to immerse the roots of the wetland plants and stay in the plant water storage layer 4, and then flows out through the water outlet pipe 7.

[0060] The working principle of the modular constructed wetland for treating biogas slurry is that the adherent cultured algal membrane can fully absorb N, P and other nutrient elements in the biogas slurry in a submerged manner, adsorb Mn, Mo, Ni, Gu, Co, Sn and other heavy metals and other organic pollutants, and the algal strains with high content of oil, protein, polysaccharide and fast growth rate such as Scenedesmus and Chlorella can be recycled and treated through the algal membrane treatment unit to recover biodiesel and plant protein (as a feed additive); the biogas slurry can be removed by 95% of ammonium and 99% of phosphate after staying in the algal membrane treatment unit 10 for three days, and the adsorption and absorption treatment through the constructed wetland type filtration treatment unit 20 can greatly improve the final treatment efficiency, supplement the short board of single constructed wetland treatment of high-concentration nitrogen and phosphorus wastewater, and make up the subsequent deficiency of single microalgae treatment of biogas slurry. The constructed wetland treatment load in the module is small, and the service life can be prolonged.

[0061] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, and should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. The information disclosed in the background section of the present application is merely intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes the prior art known by those skilled in the art.

Claims

1. A modular constructed wetland for treating biogas slurry, characterized in that, The application relates to a total pool body, an algal membrane treatment unit and a filtering treatment unit. The algal membrane treatment unit is arranged in the front half of the total pool body; the algal membrane treatment unit comprises a plurality of algal membrane supports and a pulling type water outlet; the algal membrane supports are arranged in the front half of the total pool body from front to back, and each algal membrane support is fixed on the front half of the total pool body through an anti-corrosion sealing rubber strip; the pulling type water outlet is arranged at the rear end of the front half of the total pool body. The filtering treatment unit is arranged in the rear half of the total pool body, and the rear end outlet of the algal membrane treatment unit is communicated with the front end bottom inlet of the filtering treatment unit; the algal membrane treatment unit absorbs Mn, Mo, Ni, Gu, Co and Sn heavy metals and other organic pollutants, and recovers algal strains; The front end of the total pool body is provided with a water inlet pipe which is communicated with the front end of the algal membrane treatment unit; The rear end of the total pool body is provided with a water outlet pipe which is communicated with the rear end outlet of the filtering treatment unit; The algal membrane support comprises a plate frame support on which an algal membrane sheet is arranged; the algal membrane sheet is a mixed adherent culture membrane sheet of Scenedesmus and / or Chlorella vulgaris; The filtering treatment unit comprises a first filtering layer, a second filtering layer and a plant water storage layer. The first filtering layer, the second filtering layer and the plant water storage layer are sequentially laid in the rear half of the total pool body from bottom to top; The front end of the first filtering layer is provided with the front end bottom inlet; The rear end of the plant water storage layer is provided with the rear end outlet; The first filtering layer is laid by volcanic rock particles with a particle size of 40-50 mm; The second filtering layer is sequentially laid by a zeolite layer, a straw particle layer and an oyster shell particle layer from bottom to top. The plate frame support is arranged in a plastic plate frame.

2. The modular constructed wetland for treatment of biogas slurry according to claim 1, characterized in that, In the second filtering layer, the volume ratio of the raw materials of each layer is 70% of zeolite, 20% of straw particles and 10% of oyster shells; the particle size of the zeolite is 5-8 mm, the particle size of the straw particles is 8-10 mm, and the particle size of the oyster shell particles is 3-5 mm.

3. The modular constructed wetland for treatment of biogas slurry according to claim 1, characterized in that, The plant water storage layer is composed of a light nutrient soil layer laid on the second filtering layer and a plurality of aquatic wetland plants planted in the light nutrient soil layer.

4. The modular constructed wetland for treatment of biogas slurry according to claim 1, characterized in that, ​

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