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Denitrification slow-release carbon source material for leaching type superimposed wetland and preparation method of denitrification slow-release carbon source material

A slow-release carbon source and denitrification technology, which is applied in chemical instruments and methods, anaerobic digestion treatment, special compound water treatment, etc., can solve the problems that the release cannot be effectively controlled, the scope of use is limited, and the mechanical strength is not high. , to achieve the effect of ensuring the water permeability efficiency of the wetland, ensuring the water permeability efficiency, and increasing the contact area

Pending Publication Date: 2020-06-30
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of material has a wide range of sources and is cheap. The main organic matter is cellulose, which is relatively difficult to degrade and requires a long residence time, and the release of organic matter in it cannot be effectively controlled, but the mechanical strength is not high, and there are some plant carbon. Denitrification of source materials will produce more N2O (greenhouse gas), thus limiting its use
[0005] 3) Biodegradable polymers, such as polycaprolactone, polylactic acid, polybutylene succinate, poly-β-hydroxybutyrate valerate PHBV, etc., but the price is expensive and the market prospect is low
[0006] Due to the disadvantages of the external carbon source materials used in the prior art, no superior carbon source material has appeared so far, which brings inconvenience to our research; therefore, we need to design an excellent, Low-cost denitrification slow-release carbon source materials for leaching superimposed wetlands

Method used

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  • Denitrification slow-release carbon source material for leaching type superimposed wetland and preparation method of denitrification slow-release carbon source material
  • Denitrification slow-release carbon source material for leaching type superimposed wetland and preparation method of denitrification slow-release carbon source material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh the fruit shell and polycaprolactone in proportion, stir and mix, and the mixing time is 3 minutes to obtain a mixture; take the mixture, melt it at 60 ° C, continue stirring until the material is completely melted, and obtain a molten material; The molten material is poured into the mold and molded into a spherical structure to obtain the carbon source material.

[0040] In this embodiment, the volume ratio of the fruit shell and polycaprolactone is 2:1; the fruit shell is walnut shell; the carbon source material is processed into a spherical structure 1, and the through holes 2 are arranged orthogonally to each other, and the through holes 2 The pore size of the spherical structure 1 is 7 mm, and the particle size of the spherical structure 1 is 30 mm.

Embodiment 2

[0042] Weigh the fruit shell and polycaprolactone in proportion, stir and mix, and the mixing time is 5min to obtain a mixture; take the mixture, melt it at 70°C, continue stirring until the material is completely melted, and obtain a molten material; The molten material is poured into the mold and molded into a spherical structure to obtain the carbon source material.

[0043] In this embodiment, the volume ratio of the shell and polycaprolactone is 2:1; the shell is macadamia husk; the carbon source material is processed into a spherical structure 1, and the through holes 2 are arranged orthogonally to each other, and the through holes 2 has a pore size of 8 mm, and the spherical structure 1 has a particle size of 40 mm.

Embodiment 3

[0045] Weigh the fruit shell and polycaprolactone in proportion, stir and mix, and the mixing time is 6 minutes to obtain a mixture; take the mixture, melt it at 80 ° C, continue stirring until the material is completely melted, and obtain a molten material; The molten material is poured into the mold and molded into a spherical structure to obtain the carbon source material.

[0046] In this embodiment, the volume ratio of the fruit shell and polycaprolactone is 2:1; the fruit shell is walnut shell; the carbon source material is processed into a spherical structure 1, and the through holes 2 are arranged orthogonally to each other, and the through holes 2 The pore size of the spherical structure 1 is 9 mm, and the particle size of the spherical structure 1 is 50 mm.

[0047]Structure: Observe that the carbon source materials prepared in Examples 1-3 have a particle size of 30-50 mm, the diameter of the through hole 2 of the spherical structure 1 is 7-9 mm, and the particle si...

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Abstract

The invention discloses a denitrification slow-release carbon source material for a leaching type superimposed wetland and a preparation method of the denitrification slow-release carbon source material. The components of the carbon source material comprise fruit shells and polycaprolactone, and the volume ratio of the fruit shells to the polycaprolactone is 2: 1. According to the invention, the fruit shells and polycaprolactone are mixed to be used as an external carbon source material component, and are processed; the particle size of the prepared spherical carbon source material is uniformly distributed, and the fruit shells are added to the polycaprolactone, and the volume ratio of the fruit shell to the polycaprolactone is 2: 1, such that the production cost is substantially reduced,the practicality of the product is improved, and the carbon source material can be widely used in a variety of working conditions, and has good application prospects. The component design is reasonable, the structure is simple and optimized, the obtained carbon source material can provide a carbon source for the denitrification biochemical process, the wetland water permeation efficiency is fullyguaranteed according to the special structure of the carbon source material, the cost is low, and the practicability is high.

Description

technical field [0001] The invention relates to the field of artificial wetlands, in particular to a denitrification slow-release carbon source material for leaching superimposed wetlands and a preparation method thereof. Background technique [0002] Constructed wetlands have good water purification effect and ecological benefits, but the land shortage in cities and surrounding areas is not conducive to the large-scale application of wetlands. Now, a research group has constructed a composite leaching superimposed wetland for low-pollution urban rivers. For water purification, the wetland is vertically superimposed and combined with two-level wetland structure, which can improve the land utilization rate. However, due to the lack of carbon source materials in the raw water, the removal effect of TN is still not very satisfactory. In order to solve this problem, the method of adding carbon source materials to increase the carbon-nitrogen ratio and strengthen the denitrificat...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/28C02F101/16
CPCC02F3/28C02F3/32C02F2101/16C02F2305/06
Inventor 柯凡刁飞潘成荣张浏孙宇
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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