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Double-layer carbon source microsphere and preparation and application thereof

A technology of microspheres and carbon sources, applied in the direction of microsphere preparation, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of easy corrosion, large gel pore size, low mechanical strength, etc., and achieve enhanced mechanical strength and prolongation Time, the effect of improving the enrichment ability

Active Publication Date: 2019-11-29
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easy to corrode, has low mechanical strength and strong hydrophilicity, and the formed gel has a large pore size, so the release rate of the content is fast and burst release is easy to occur.

Method used

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  • Double-layer carbon source microsphere and preparation and application thereof
  • Double-layer carbon source microsphere and preparation and application thereof
  • Double-layer carbon source microsphere and preparation and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0033]The preparation method of gelatin-sodium alginate microspheres is as follows: a specific proportion of sodium alginate, gelatin, activated carbon, and carbon source are blended and dissolved to obtain a hydrogel, and then the hydrogel is dropped into the cross-linking agent calcium chloride with a syringe and glutaraldehyde to form microspheres. After the spherical shape of the microspheres is stable, rinse them with pure water three times repeatedly, and put them in the refrigerator at 4°C to mature overnight. The specific preparation method of the microspheres is described in detail below:

[0034] 1. Preparation method of monolayer blank microspheres:

[0035] (1) Add 0.3-0.5g of gelatin into 100ml of pure water, and stir evenly with a glass rod in a water bath at 40°C to fully dissolve it, then raise the temperature of the water bath to 80°C, then add 2-2.5g of sodium alginate, and continue to stir evenly When the sodium alginate is fully dissolved and the solution ...

Embodiment 1

[0046] Example 1: Demonstration of the slow-release ability of carbon sources of various microspheres

[0047] In the effluent of sewage reaching the standard, this test pays more attention to the changes of four indicators, namely: TN (total nitrogen concentration), TP (total phosphorus concentration), COD (chemical oxygen demand) and NH 3 -N (ammonia nitrogen concentration); the slow-release test of various microspheres is to verify that the four indicators will not increase after the microspheres are added to the water body, that is, no pollutants are introduced, or the pollutants introduced The concentration is within the range of microsphere treatment, and the microsphere can remove the pollutants introduced by itself during the final discharge; the second is that the microsphere is used as the carrier material of the slow-release carbon source, and it is necessary to measure the concentration of COD of the microsphere in water over time. To prove that the microspheres ca...

Embodiment 2

[0053] Example 2: Demonstration of the effects of various types of microspheres in treating domestic sewage

[0054] 1. Prepare the same groups of microspheres as in Example 1 (and the abbreviation of the microspheres in the figure below is also the same as in Example 1). Take the effluent from the secondary sedimentation tank in the integrated domestic sewage treatment device. After the effluent is treated by the front end, the C / N is low, which affects the normal progress of biological denitrification and requires advanced treatment. The effluent was measured, and the initial concentration of TN was 42.95mg / L, the initial COD of effluent was 31.33mg / L, the concentration of TP was 0.9mg / L, and the concentration of ammonia nitrogen was 14.46mg / L, which was used as the test sewage. Weigh 6g of microspheres from each group and add them to 3L of domestic sewage. All test groups are cultured anaerobically, and the test sewage without microspheres is set as the control group. Meas...

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Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a double-layer carbon source microsphere with a function for advanced treatment of low C / N ratio domestic sewage andpreparation and application of the double-layer carbon source microsphere, in particular to a double-layer microsphere built by gelatin and sodium alginate. A macromolecule carbon source is embeddedwith an inner layer of the microsphere, and a microsphere carbon source is embedded with an outer layer of the microsphere. When the low C / N ratio domestic sewage is deeply treated, a certain amount of the microspheres are directly put into the domestic sewage. The preparation method of the double-layer carbon source microsphere is simple, reaction conditions are mild, and used carrier materials are degradable materials. The microspheres are directly put into the domestic sewage, the carbon sources are released, the appropriate carbon sources can be provided to enable biological denitrification to be carried out normally, pollutants cannot be introduced, the carrier materials can naturally degrade after treatment, and secondary pollution cannot be caused to the environment.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a double-layer carbon source microsphere capable of advanced treatment of domestic sewage with a low C / N ratio, a preparation method and application thereof. Background technique [0002] In recent years, the discharge of low C / N sewage, that is, sewage with high nitrogen concentration and relatively low organic matter concentration has been paid more and more attention by people. If such sewage is directly discharged into the water body without proper treatment, the eutrophication of the water body will become more and more serious, the ecosystem will be degraded, and the ecological service function will decline. [0003] At present, the water purification technology realized by biological denitrification and denitrification is a common way to treat low C / N sewage denitrification. The traditional denitrification theory believes that in order to achieve complete denit...

Claims

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Application Information

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IPC IPC(8): C02F3/34B01J13/02
CPCB01J13/02C02F3/34C02F2305/06
Inventor 谢翼飞邢云霄兰书焕李旭东刘咏蔡莉
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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