CN111348749A - Denitrification slow-release carbon source material for leaching type superposed wetland and preparation method thereof - Google Patents

Denitrification slow-release carbon source material for leaching type superposed wetland and preparation method thereof Download PDF

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Publication number
CN111348749A
CN111348749A CN202010183728.8A CN202010183728A CN111348749A CN 111348749 A CN111348749 A CN 111348749A CN 202010183728 A CN202010183728 A CN 202010183728A CN 111348749 A CN111348749 A CN 111348749A
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carbon source
source material
denitrification
slow
wetland
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柯凡
刁飞
潘成荣
张浏
孙宇
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Nanjing Institute of Geography and Limnology of CAS
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Nanjing Institute of Geography and Limnology of CAS
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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
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biotechnology (AREA)
  • Botany (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention discloses a denitrification slow-release carbon source material for a leaching type superposed wetland and a preparation method thereof, wherein the carbon source material comprises fruit shells and polycaprolactone, and the volume ratio of the fruit shells to the polycaprolactone is 2: 1. According to the preparation method, the shells and the polycaprolactone are mixed to serve as the components of the external carbon source material, the components are processed, the particle size of the prepared spherical carbon source material is uniformly distributed, and the shells are added into the polycaprolactone, so that the volume ratio of the shells to the polycaprolactone is 2:1, the production cost is greatly reduced, the practicability of the product is improved, the carbon source material can be widely applied to various working conditions, and the application prospect is high. The invention has reasonable component design and simple and optimized structure, the obtained carbon source material not only can provide a carbon source for the denitrification biochemical process, but also fully ensures the water permeation efficiency of the wetland according to the special structure, and has low cost and higher practicability.

Description

Denitrification slow-release carbon source material for leaching type superposed wetland and preparation method thereof
Technical Field
The invention relates to the field of constructed wetlands, in particular to a denitrification slow-release carbon source material for a leaching type superposed wetland and a preparation method thereof.
Background
The constructed wetland has better water quality purification effect and ecological benefit, but the urban and surrounding land is generally short and is not beneficial to large-scale application of the wetland, at present, a subject group constructs a composite leaching type superposed wetland for purifying the water quality of low-pollution urban rivers, the wetland vertically superposes and combines two stages of wetland structures, the land utilization rate can be improved, but the TN removal effect is still not ideal due to the lack of carbon source materials in raw water. In order to solve the problem, the carbon-nitrogen ratio is improved by considering the mode of adding carbon source materials, and the denitrification of microorganisms is enhanced, so that the denitrification effect of the leaching type superposed wetland is improved.
The materials of the external carbon source commonly used in the artificial wetland can be mainly divided into three types: 1) traditional low molecular carbon source material, such as methanol, sodium acetate, ethanol [6], etc. Although the carbon source material is easily degraded by microorganisms and has high utilization rate of denitrifying bacteria, the carbon source material is usually added along with inlet water in a solution form, and the CODCr concentration of outlet water is increased if the carbon source material is not well matched with the inlet water.
2) Cellulose natural biomass material organic matter, such as reed, straw and the like. However, the material is wide in source and low in price, the main organic matter is cellulose, the cellulose is difficult to degrade, the required retention time is long, the release of the organic matter in the material cannot be effectively controlled, the mechanical strength is not high, and the denitrification of some plant carbon source materials can generate more N2O (greenhouse gas), so that the application range of the material is limited.
3) Biodegradable polymers such as polycaprolactone, polylactic acid, polybutylene succinate, poly β -hydroxybutyrate valerate PHBV and the like are expensive and have low market prospect.
As the additional carbon source materials used in the prior art have the defects, no excellent carbon source material exists so far, which brings inconvenience to the research of people; therefore, in order to solve the problem, a denitrification slow-release carbon source material for the leaching type superposed wetland is required to be designed, wherein the denitrification slow-release carbon source material has excellent performance and low cost.
Disclosure of Invention
The invention aims to provide a denitrification slow-release carbon source material for a leaching type superposed wetland and a preparation method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a denitrification slow-release carbon source material for a leaching type superposed wetland comprises fruit shells and polycaprolactone, wherein the volume ratio of the fruit shells to the polycaprolactone is 2: 1.
In an optimized scheme, the shells are walnut shells or macadamia nut shells.
The invention discloses a denitrification slow-release carbon source material for a leaching type superposed wetland, which comprises fruit shells and polycaprolactone, wherein in the prior art, the fruit shells are usually added as an external carbon source material, but the grain sizes of the fruit shells are different, and after the fruit shells are added into a filler layer, the fruit shells with larger grain sizes can block gaps among metric stones in the filler layer, so that the denitrification effect and the water flow are influenced, and the purification efficiency is reduced; the polycaprolactone is very expensive, and the polycaprolactone is used as an external carbon source material, so that the application prospect is low, large-scale feeding cannot be realized, and the cost is high.
Therefore, the shell and the polycaprolactone are mixed to serve as the components of the external carbon source material and are processed, the particle size of the prepared spherical carbon source material is uniformly distributed, the shell is added into the polycaprolactone, the volume ratio of the shell to the polycaprolactone is 2:1, the production cost is greatly reduced, the practicability of the product is improved, and the carbon source material can be widely applied to various working conditions and has a high application prospect.
According to an optimized scheme, the carbon source material is processed into a spherical structure, a plurality of through holes are arranged in the spherical structure, and the through holes are arranged in a staggered mode.
When the carbon source material is prepared, the carbon source material is processed into the spherical structure, the plurality of through holes are arranged in the spherical structure and are staggered with each other, and when the carbon source material is actually applied, water can directly flow through the through holes, so that the influence of the carbon source material on the flow velocity of the water is avoided, the hydraulic resistance of the packing layer is not influenced, the water permeation efficiency of the wetland can be ensured, and the water is contacted with the through holes in the carbon source material, so that the contact area is increased, and the purification efficiency is further improved.
In an optimized scheme, the through holes are arranged in an orthogonal mode.
In the actual preparation of the invention, the through holes can be arranged to be mutually orthogonal and staggered, and also can be arranged to be mutually oblique and staggered.
In an optimized scheme, the aperture of the through hole is 7-9mm, and the particle size of the spherical structure is 30-50 mm.
In the spherical structure prepared by the method, the aperture of the through hole is 7-9mm, so that the removal efficiency of the carbon source material can be ensured to be highest while the mechanical property of the carbon source material is ensured, and when the aperture is larger, the larger the contact area between the water flow and the carbon source material is, the larger the aperture is, the influence on the mechanical property of the carbon source material can be caused, so that the aperture is set to be 7-9mm, the stable existence of the spherical structure, the through hole and other structures can be ensured, and the use effect of the carbon source material can also be improved.
During actual preparation, the aperture of the through hole of the spherical structure of the carbon source material is optimally 8 mm.
According to an optimized scheme, the preparation method of the denitrification slow-release carbon source material for the leaching type superposed wetland comprises the following steps of:
1) weighing the fruit shell and the polycaprolactone in proportion, stirring and mixing for 3-6min to obtain a mixture;
2) melting the mixture at 60-80 deg.C, and stirring until the material is completely melted to obtain molten material;
3) and injecting the obtained molten material into a mold, and performing injection molding to obtain the carbon source material with a spherical structure.
According to the optimized scheme, the denitrification slow-release carbon source material is applied to the leaching type superposed wetland.
According to the optimized scheme, the denitrification slow-release carbon source material is applied to the leaching type superposed wetland, the prepared carbon source material is stirred and mixed with the centimeter stone, and then the mixture is added into a filler layer of a denitrification section of the wetland.
According to the optimized scheme, the denitrification slow-release carbon source material is applied to the leaching type superposed wetland, and the adding amount of the carbon source material is determined according to the COD concentration, TN concentration and inflow flow of inflow water.
The optimized scheme is the application of the denitrification slow-release carbon source material in the aerobic denitrification process.
When the carbon source material prepared by the scheme is actually put in, the putting amount can be determined according to the water inlet condition in the wetland, the putting working condition is not limited to leaching type superposed wetland, and the carbon source material can be screened for other types of wetlands, sewage plants, aerobic culture denitrification and other processes, so that the application prospect is wider.
Compared with the prior art, the invention has the beneficial effects that:
the carbon source material is in a spherical structure, staggered through holes are formed in the spherical structure, the three-dimensional pore channel is constructed, so that the carbon source material has a stacking porosity of up to 69%, the hydraulic resistance of a filler layer is not influenced even if abundant microorganisms grow, and the water permeability efficiency of the wetland can be ensured.
The invention optimizes and selects the material structure, so that the effective components can be slowly released under the action of microorganisms, the service life of the carbon source is prolonged by 5-8 years, meanwhile, due to the selection of the raw material components, the cost is greatly reduced, and the application field and the prospect are further expanded.
The invention discloses a denitrification slow-release carbon source material for a leaching type superposed wetland and a preparation method thereof.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic view of a spherical structure of a denitrification slow-release carbon source material for a leaching type superposed wetland, which is disclosed by the invention;
FIG. 2 is a cross-sectional view of a spherical structure of the denitrification slow-release carbon source material for the leaching type stacked wetland.
In the figure: 1-spherical structure, 2-through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
weighing the fruit shell and the polycaprolactone in proportion, stirring and mixing for 3min to obtain a mixture; taking the mixture, melting at 60 ℃, and continuously stirring until the material is completely melted to obtain a molten material; and injecting the obtained molten material into a mold, and performing injection molding to obtain the carbon source material with a spherical structure.
In this example, the volume ratio of the fruit shell to the polycaprolactone was 2: 1; the shell is walnut shell; the carbon source material is processed into a spherical structure 1, the through holes 2 are mutually orthogonally arranged, the aperture of each through hole 2 is 7mm, and the grain diameter of the spherical structure 1 is 30 mm.
Example 2:
weighing the fruit shell and the polycaprolactone in proportion, stirring and mixing for 5min to obtain a mixture; taking the mixture, melting at 70 ℃, and continuously stirring until the material is completely melted to obtain a molten material; and injecting the obtained molten material into a mold, and performing injection molding to obtain the carbon source material with a spherical structure.
In this example, the volume ratio of the fruit shell to the polycaprolactone was 2: 1; the fruit shell is a macadamia nut shell; the carbon source material is processed into a spherical structure 1, the through holes 2 are mutually orthogonally arranged, the aperture of each through hole 2 is 8mm, and the grain diameter of the spherical structure 1 is 40 mm.
Example 3:
weighing the fruit shell and the polycaprolactone in proportion, stirring and mixing for 6min to obtain a mixture; taking the mixture, melting at 80 ℃, and continuously stirring until the material is completely melted to obtain a molten material; and injecting the obtained molten material into a mold, and performing injection molding to obtain the carbon source material with a spherical structure.
In this example, the volume ratio of the fruit shell to the polycaprolactone was 2: 1; the shell is walnut shell; the carbon source material is processed into a spherical structure 1, the through holes 2 are mutually orthogonally arranged, the aperture of each through hole 2 is 9mm, and the grain diameter of the spherical structure 1 is 50 mm.
The structure is as follows: the carbon source materials prepared in examples 1 to 3 were observed to have particle sizes of 30 to 50mm, and the diameter of the through-hole 2 of the spherical structure 1 was 7 to 9mm, with uniform particle size distribution.
Detection experiment:
1. preparing raw materials: taking the carbon source material prepared in the example 2 as an experimental group;
mixing cortex Choerospondiatis shell and walnut shell, crushing to particle size of about 3-5mm, washing with clear water, removing shell with dark color and small density, and oven drying at 45 deg.C to obtain fruit shell group;
taking polycaprolactone (PCL2200) purchased from Suwei company in America, the particle size is about 5mm, elutriating with clear water, and drying at 45 ℃ to obtain polycaprolactone group;
collecting polylactic acid with particle size of about 5mm from Suwei of America, elutriating with clear water, and oven drying at 45 deg.C to obtain polylactic acid group;
selecting peat soil purchased in nearby flower and plant farms with a particle size range of 0-10mm, picking out impurities with larger volume in the peat soil, enabling the particle size range to be 0-10mm, and naturally drying the peat soil to obtain a peat soil group.
2. Preparation of experimental apparatus:
5 organic glass columns are arranged, and 5 carbon sources (an experimental group, a fruit shell group, a polycaprolactone group, a peat soil group and a polylactic acid group) are respectively filled into the organic glass columns so as to simulate a leaching type stacked wetland matrix layer.
The columnar model is made of transparent organic glass material, the change of the packing layer can be observed, the inner diameter is 80mm, the height is 1200mm (the height of the packing layer is 800mm, and the bottom bearing layer is 150mm), the matrix of the bearing layer is common calcareous centimeter stone, and the particle size is about 5-15 mm.
Raw water is stored in the water inlet tank and is pumped into the organic glass column through the peristaltic pump, the columnar model adopts an upper water inlet mode, a spray head is installed at the top end of the organic glass column and is distributed to the packing layer through the water distribution hole disc, water flows downwards through the matrix layer by layer under the action of gravity and is filtered, and a water outlet is formed at a position 30mm away from the bottom of the organic glass column.
3. The experimental method comprises the following steps:
during operation, artificial inoculation and biofilm formation are adopted, and the strain is derived from activated sludge in an aeration tank of a sewage treatment plant in Jincun village, Nanjing City. Diluting a proper amount of granular activated sludge in a 1L big beaker by adding water, stirring for 6 hours on a magnetic stirrer, standing for 1 hour for precipitation, taking supernatant, adding the supernatant containing the strain into self-prepared water, and inputting the supernatant into columnar models by using an electromagnetic metering pump, wherein the flow rate of each columnar model is 0.8L/h.
The first 30 days after water operation is carried out is a film forming period of filler, the experimental period is carried out after film forming is finished, the water inlet flow of each organic glass column is 18mL/min, the treated water amount is 25.92L/d, and the average hydraulic load is 0.86m3/(m2D) average total nitrogen volume loading of 7.69 g/(m)3·d)。
During the experiment, the inlet water and the outlet water of each group of columnar models are respectively sampled and monitored once every 7 days, and the monitoring indexes are Dissolved Oxygen (DO), chemical oxygen demand (CODCr), Total Nitrogen (TN) and nitrate Nitrogen (NO)3 -)。
Wherein DO of the water sample is measured by a Hash HQ40d water quality analyzer; the TN is measured by an alkaline potassium persulfate digestion-ultraviolet spectrophotometry; NO3 -The determination is that a water sample is subjected to low-pressure suction filtration by a 0.45um acetate fiber membrane, and filtrate is taken and determined by a continuous flow analyzer (Skalarsan + +); the CODCr is determined by a rapid oil bath method.
① As for dissolved oxygen index (DO), the average DO concentration of raw water is 7.36 + -0.23 mg/L, while the average DO concentration of the test group is 2.89 + -0, 31mg/L, the average DO concentration of the fruit shell group is 4.81 + -0.68 mg/L, the average DO concentration of the PCL group is 2.22 + -0.34 mg/L, the average DO concentration of the polylactic acid group is 6.78 + -0.61 mg/L, and the average DO concentration of the peat soil group is 3.15 + -0.32 mg/L.
From the above, the average DO concentration of the effluent is: the polylactic acid group, the fruit shell group, the peat soil group, the experimental group and the polycaprolactone group.
② until the experiment is finished, the CODCr concentration of the effluent of the fruit shell group, the polycaprolactone group and the experimental group is below 25mg/L, and meets the IV-class water standard of the quality standard of surface water environment (GB 3838-2002);
the CODCr concentration of the effluent of the polylactic acid group and the peat soil group is below 15mg/L, which reaches the I-class water standard of the environmental quality standard of surface water (GB 3838-2002).
③ it can be seen from the test data that the total nitrogen removal effect of the hull group, polycaprolactone group and experimental group is better, the buffer capacity is stronger, the average removal rate is above 75%, the TN concentration of the discharged water of the polylactic acid group and peat soil group is slightly lower than that of the inlet water, the average removal rate is 13.66% and 25.60%, and the removal rate is lower.
④ Hull group, polycaprolactone group and experimental group which are substantially free from NO in the feed water3 -Influence of concentration fluctuations, NO3 -The removal rate is always kept above 90%, and the effluent quality is stable.
And (4) conclusion: as can be seen from the above detection experiment, the total nitrogen removal rate and NO of the slow-release carbon source material prepared by the method3 -The removal rate is excellent, the carbon source can be completely utilized by denitrifying microorganisms to provide a carbon source for a denitrifying biochemical process, and the use effect is excellent when the carbon source is applied to the leaching type superposed wetland.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A denitrification slow-release carbon source material for a leaching type superposed wetland is characterized in that: the carbon source material comprises a fruit shell and polycaprolactone, and the volume ratio of the fruit shell to the polycaprolactone is 2: 1.
2. The denitrification slow-release carbon source material for the leaching type superposed wetland according to claim 1, which is characterized in that: the shell is walnut shell or macadamia nut shell.
3. The denitrification slow-release carbon source material for the leaching type superposed wetland according to claim 1, which is characterized in that: the carbon source material is processed into a spherical structure (1), a plurality of through holes (2) are arranged in the spherical structure (1), and the through holes (2) are arranged in a staggered mode.
4. The denitrification slow-release carbon source material for the leaching type stacked wetland according to claim 3, which is characterized in that: the aperture of the through hole (2) is 7-9mm, and the particle size of the spherical structure (1) is 30-50 mm.
5. The denitrification slow-release carbon source material for the leaching type stacked wetland according to claim 3, which is characterized in that: the through holes (2) are arranged in an orthogonal mode.
6. A preparation method of denitrification slow-release carbon source material for a leaching type superposed wetland is characterized by comprising the following steps: the preparation steps of the carbon source material comprise:
1) weighing the fruit shell and the polycaprolactone in proportion, stirring and mixing for 3-6min to obtain a mixture;
2) melting the mixture at 60-80 deg.C, and stirring until the material is completely melted to obtain molten material;
3) and injecting the obtained molten material into a mold, and performing injection molding to obtain the carbon source material with a spherical structure.
7. The application of the denitrification slow-release carbon source material in the leaching type superposed wetland according to the claims 1-5.
8. The application of the denitrification slow-release carbon source material in the leaching type superposed wetland according to claim 7 is characterized in that: and stirring and mixing the carbon source material and the centimeter stone, and adding the mixture into a filler layer of the wetland denitrification section.
9. The application of the denitrification slow-release carbon source material in the leaching type superposed wetland according to claim 8 is characterized in that: the adding amount of the carbon source material is determined according to the COD concentration, TN concentration and inflow flow of water.
10. The use of the denitrification slow-release carbon source material according to the claims 1-5 in an aerobic denitrification process.
CN202010183728.8A 2020-03-16 2020-03-16 Denitrification slow-release carbon source material for leaching type superposed wetland and preparation method thereof Pending CN111348749A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110182947A (en) * 2019-06-24 2019-08-30 南京泽辉环保科技有限公司 A kind of wetland denitrification filler and its application
CN110407333A (en) * 2019-07-23 2019-11-05 中国科学院南京地理与湖泊研究所 A kind of horizontal subsurface flow wetland denitrification denitrogenation Enhancement Method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110182947A (en) * 2019-06-24 2019-08-30 南京泽辉环保科技有限公司 A kind of wetland denitrification filler and its application
CN110407333A (en) * 2019-07-23 2019-11-05 中国科学院南京地理与湖泊研究所 A kind of horizontal subsurface flow wetland denitrification denitrogenation Enhancement Method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
贾丽娜: "新型淋滤式复合湿地对低碳氮比河水深度净化研究", 《中国优秀硕士学位论文全文数据库电子期刊 工程科技I辑》 *

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