A kind of composite biological filler that promotes rapid start-up and stable operation of anaerobic ammonium oxidation and its preparation method and application

An anaerobic ammonium oxidation and quick-start technology, which is applied in anaerobic digestion treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of destroying the packing structure, affecting water quality, system instability, etc., to improve the reaction Efficiency, promoting rapid growth, promoting electron transfer effects

Active Publication Date: 2020-06-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the Anammox reaction has many advantages, there are still many problems in practical application: the doubling rate of Anammox bacteria is slow, and the enrichment time of bacteria is long, so the start-up time of Anammox reactor often takes more than one year
However, since the sponge iron, activated carbon and polyurethane foam in the filler rely on the adhesive bonding of the polyurethane foam itself, the bonding force is weak. packing structure
At the same time, when the particles of activated carbon and sponge iron are large, the specific surface area is small, and the efficiency is low. Even if the activated carbon and sponge iron are ground into small particles, the problem of activated carbon and iron powder flowing out with the effluent due to their weak binding force will also cause the system. Stable, but there are certain limitations in practical applications

Method used

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  • A kind of composite biological filler that promotes rapid start-up and stable operation of anaerobic ammonium oxidation and its preparation method and application
  • A kind of composite biological filler that promotes rapid start-up and stable operation of anaerobic ammonium oxidation and its preparation method and application
  • A kind of composite biological filler that promotes rapid start-up and stable operation of anaerobic ammonium oxidation and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh the granular activated carbon, and use a small grinder to grind the laboratory granular activated carbon into a powder of 5 μm. Add the obtained powdered activated carbon into NaCl solution with a mass concentration of 5% to soak for 1 hour, rinse and dry it for later use. Weigh 60g of polyvinyl alcohol, 40g of glucomannan gum, 10g of calcium chloride and 10g of 0.1mm iron powder into 500mL of distilled water, then put 20g of the prepared activated carbon powder into the solution, stir and dissolve to form a cross-linking mixed solution, and stir evenly.

[0051] Add 50g polyester polyol, 50g polyisocyanate, 100g water, 20g tetramethylethylenediamine catalyst, 35g surfactant and 15g foaming agent into the container, stir at high speed for 2s, then add the prepared crosslinking mixed solution, After continuing to stir for 2 minutes, pour it into a mold for molding, and then put it in a refrigerator at 0° C. for 48 hours to obtain 200 g of composite polyurethane fil...

Embodiment 2

[0053] Weigh the granular activated carbon, and use a small grinder to grind the laboratory granular activated carbon into a powder of 20 μm. Add the obtained powdered activated carbon into NaCl solution with a mass concentration of 5% to soak for 1 hour, rinse and dry it for later use. Weigh 60g of polyvinyl alcohol, 20g of glucomannan gum, 10g of calcium chloride and 10g of 0.25mm iron powder into 500mL of distilled water, then put 10g of the prepared activated carbon powder into the solution, stir and dissolve to form a cross-linking mixed solution, and stir evenly.

[0054] Add 50g polyester polyol, 50g polyisocyanate, 100g water, 20g tetramethylethylenediamine catalyst, 35g surfactant and 15g foaming agent into the container, stir at high speed for 3s, then add the prepared crosslinking mixed solution, After continuing to stir for 2 minutes, it was poured into a mold for molding, and then stored in a refrigerator at 0° C. for 48 hours to obtain 179 g of composite polyuret...

Embodiment 3

[0056] Weigh the granular activated carbon, and use a small grinder to grind the laboratory granular activated carbon into a powder of 50 μm. Add the obtained powdered activated carbon into NaCl solution with a mass concentration of 5% to soak for 1 hour, rinse and dry it for later use. Weigh 60g of polyvinyl alcohol, 30g of glucomannan gum, 10g of calcium chloride and 10g of 0.2mm iron powder into 500mL of distilled water, then put 15g of the prepared activated carbon powder into the solution, stir and dissolve to form a cross-linking mixed solution, and stir evenly.

[0057] Add 50g of polyester polyol, 50g of polyisocyanate, 100g of water, 20g of tetramethylethylenediamine catalyst, 35g of surfactant and 15g of foaming agent into the container, stir at high speed for 2.5s, and then add the prepared crosslinking mixed solution , after continuing to stir for 2 minutes, pour it into a mold for molding, then put it in a refrigerator and store it at 0°C for 48 hours to obtain 18...

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Abstract

The invention discloses a composite biological filler for promoting rapid start-up and stable operation of anaerobic ammonium oxidation and a preparation method and application thereof, and belongs tothe field of water treatment. According to the biological filler, polyurethane foams, activated carbon and iron dust which are connected through a crosslinking agent are included, and the biologicalfiller is prepared by a method in which the activated carbon and the iron dust are added directly during the foaming process when the polyurethane foams are prepared. By means of the method, the activated carbon and the iron dust are firmly connected with the surfaces of the polyurethane foams, and the start-up efficiency of anaerobic ammonium oxidation can be effectively improved by applying thefiller to a UASB reactor.

Description

technical field [0001] The invention belongs to the field of water treatment, and more specifically relates to a composite biological filler for promoting fast startup and stable operation of anaerobic ammonium oxidation and its preparation method and application. Background technique [0002] Since Anammox was discovered, it has been given great attention by the scientific community. It is produced by anammox bacteria under anaerobic conditions to ammonia nitrogen NH 4 + -N as electron donor, nitrite nitrogen NO 2 - -N is the electron acceptor converted to N 2 Reaction. Unlike the traditional ammonia oxidation-denitrification process, Anammox does not require an external organic carbon source and does not require aeration, which greatly reduces energy consumption and costs during the treatment process. [0003] Although the Anammox reaction has many advantages, there are still many problems in practical application: the doubling rate of Anammox bacteria is slow, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/34C02F101/16
CPCC02F3/2846C02F3/34C02F2101/16C02F2101/166
Inventor 刘波盛世雄杜凌峰程绍举侯玉倩孙信伯梁子
Owner NANJING UNIV
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