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Ecological slow-release carbon source, and preparation method and application thereof

A slow-release carbon source and ecological technology, applied in chemical instruments and methods, biological water/sewage treatment, special compound water treatment, etc. and other problems, to achieve the effect of long-term release, reduced degree of polymerization, and increased surface area

Inactive Publication Date: 2020-06-26
BEIJING DRAINAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make up for the deficiencies of the prior art, aiming at the problem that the natural cellulose-based solid slow-release carbon source has a short release period and a large amount of release in the early stage is likely to cause secondary pollution. As well as the optimization of conditions, an ecologically efficient slow-release carbon source material was prepared to improve the removal efficiency of nitrogen in the water environment

Method used

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  • Ecological slow-release carbon source, and preparation method and application thereof
  • Ecological slow-release carbon source, and preparation method and application thereof
  • Ecological slow-release carbon source, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example provides an ecological slow-release carbon source and its preparation method.

[0041] Step 1: Preliminary pretreatment and cutting of corn stalks, with a diameter screening specification of 2 ± 0.2 cm, cleaned and air-dried, to be processed;

[0042] Step 2, take 10 parts by weight of the sample, and the heating rate is 8°C·min -1 Medium and low temperature dry distillation treatment (temperature is 165°C), and then pyrolysis in water for 60 minutes (pyrolysis temperature is 200°C);

[0043] Step 3, cool the sample after the pyrolysis treatment in step 2 to room temperature, dry to constant weight, obtain the basic slow-release carbon source, fix 3 parts by weight of denitrifying bacteria liquid in the basic slow-release carbon source, and obtain the ecological slow-release carbon source. release carbon source.

[0044] figure 1 A scanning electron micrograph showing the organizational structure of unmodified corn stalks, figure 2 Shown is the scanni...

Embodiment 2

[0046] This example provides an ecological slow-release carbon source and its preparation method.

[0047] Step 1: Preliminary pretreatment and cutting of the reed stalks, with a diameter screening specification of 1 ± 0.2 cm, cleaned and air-dried, to be processed;

[0048] Step 2, take 20 parts by weight of the sample, and the heating rate is 12°C·min -1 Medium and low temperature dry distillation treatment (temperature is 160°C), and then pyrolysis in water for 30min (pyrolysis temperature is 200°C);

[0049] Step 3, cool the sample after the pyrolysis treatment in step 2 to room temperature, dry to constant weight, obtain the basic slow-release carbon source, fix 5 parts by weight of denitrifying bacteria liquid in the basic slow-release carbon source, and obtain the ecological slow-release carbon source. release carbon source.

[0050]The prepared slow-release carbon source is fine and compact, and the structure of cellulose, hemicellulose and lignin is stable. The stru...

Embodiment 3

[0052] This example provides an ecological slow-release carbon source and its preparation method.

[0053] Step 1: Preliminary pretreatment and cutting of corn stalks, with a diameter screening specification of 0.5 ± 0.2 cm, cleaned and air-dried, to be processed;

[0054] Step 2, take 15 parts by weight of the sample, and the heating rate is 8°C·min -1 Medium and low temperature dry distillation treatment (temperature is 170°C), and then pyrolysis in water for 40min (pyrolysis temperature is 194°C);

[0055] Step 3, cool the sample after the pyrolysis treatment in step 2 to room temperature, dry to constant weight, obtain the basic slow-release carbon source, fix 4 parts by weight of denitrifying bacteria liquid in the basic slow-release carbon source, and obtain the ecological slow-release carbon source. release carbon source.

[0056] The prepared slow-release carbon source is fine and compact, and the structure of cellulose, hemicellulose and lignin is stable. The struct...

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Abstract

The invention discloses an ecological slow-release carbon source, and a preparation method and an application thereof. The preparation method comprises the following steps: carrying out destructive distillation treatment and pyrolysis on a straw material, and then drying to a constant weight to obtain a basic solid-phase slow-release carbon source; and immobilizing a denitrifying bacteria liquid on the basic solid-phase slow-release carbon source to obtain the ecological slow-release carbon source. In the preparation process of the ecological slow-release carbon source, medium-low temperaturedestructive distillation treatment and pyrolysis treatment destroy a lignocellulose structure, reduce the length of a cellulose molecular chain, reduce the polymerization degree and improve the availability of microorganisms for cellulose and hemicellulose, and meanwhile, the treated structure has porosity, the surface area is increased, and the carbon source is beneficial to long-term release. The ecological slow-release carbon source provided by the invention can maintain release of the carbon source for a long time, the average removal rate of nitrate nitrogen is maintained at about 92% andis far higher than the rate of release of the carbon source of a natural straw material, and secondary pollution to a water environment cannot be caused after long-term use of the ecological slow-release carbon source.

Description

technical field [0001] The invention belongs to the technical field of nitrogen removal for water environment treatment, and more specifically relates to an ecological slow-release carbon source and its preparation method and application. Background technique [0002] At present, the sources of urban rivers, park water bodies and landscape water bodies in large cities are mainly reclaimed water from water plants, but most of the effluent from urban reclaimed water plants has a low carbon-to-nitrogen ratio, while nitrate nitrogen is the main source of total nitrogen, and nitrate is present in water bodies. Long-term existence will cause additional risk factors to the water environment, such as excessive nitrates, which will lead to aggravated nitrate pollution in water bodies. For the same denitrification and denitrification, it is necessary to add an additional organic carbon source as the electron donor, and nitrate as the final electron acceptor, and reduce the nitrate to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C02F101/16
CPCC02F3/2806C02F3/34C02F2101/16C02F2305/06
Inventor 李魁晓王军静蒋勇白宇朱昱豪
Owner BEIJING DRAINAGE GRP CO LTD
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