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Preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification

A composite particle and denitrification technology, applied in the field of water treatment, can solve the problems of easy collapse and poor controlled release, and achieve the effects of simple steps, increased adhesion area and excellent mechanical properties

Active Publication Date: 2015-01-21
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of poor controlled-release effect and easy collapse of natural solid-phase carbon sources at present, the invention discloses a preparation method of controlled-release carbon source composite particles for biological denitrification and denitrification

Method used

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  • Preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification
  • Preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The controlled-release carbon source composite particles for biological denitrification and denitrification were prepared according to the following method:

[0019] (1) Each component of following mass ratio: polylactic acid 400g, walnut shell 1000g, high-density polyethylene 592g, maleic anhydride 4g, sodium carbonate 1g, isoascorbic acid 1g, trace element mixture 2g are mixed in mechanical stirrer uniform.

[0020] (2) The mixture in step (1) was injected into the twin-screw extruder through the feeding port for melt blending, the extrusion temperature was 160° C., and cut into granules by a granulator.

[0021] (3) Cook the granules prepared in step (2) in boiling water for 10 minutes, and set aside.

[0022] Next, the denitrification performance of the controlled-release carbon source composite particles prepared in the above steps is tested through experiments.

[0023] Put the controlled-release carbon source composite particles and activated sludge into the fl...

Embodiment 2

[0025] The controlled-release carbon source composite particles for biological denitrification and denitrification were prepared according to the following method:

[0026] (1) each component of following mass ratio: polybutylene succinate 1400g, hemp fiber 200g, polystyrene 391g, maleic anhydride 2g, sodium carbonate 1g, erythorbic acid 1g, trace element mixture 5g in Mix well in a mechanical mixer.

[0027] (2) The mixture in step (1) is injected into the twin-screw extruder through the feeding port for melt blending, the extrusion temperature is 180° C., and cut into granules by a granulator.

[0028] (3) Cook the granules prepared in step (2) in boiling water for 10 minutes, and set aside.

[0029] Next, the denitrification performance of the controlled-release carbon source composite particles prepared in the above steps is tested through experiments.

[0030] Put the controlled-release carbon source composite particles and activated sludge into the fluidized bed reacto...

Embodiment 3

[0032] The controlled-release carbon source composite particles for biological denitrification and denitrification were prepared according to the following method:

[0033] (1) Each component of following mass ratio: polybutylene succinate 800g, walnut shell 400g, polystyrene 790g, maleic anhydride 2g, sodium bicarbonate 2g, erythorbic acid 1g, trace element mixture 5g Mix well in a mechanical mixer.

[0034] (2) The mixture in step (1) is injected into the twin-screw extruder through the feeding port for melt blending, the extrusion temperature is 180° C., and cut into granules by a granulator.

[0035] (3) Cook the granules prepared in step (2) in boiling water for 10 minutes, and set aside.

[0036] The denitrification performance of the controlled-release carbon source composite particles prepared by the above steps is tested by experiment below, see figure 1 , figure 2 .

[0037] Put the controlled-release carbon source composite particles and activated sludge into t...

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Abstract

Aiming to solve the problems that harm to human health is caused due to drinking of underground water with high nitrate content and that an existing carbon source material in use has the defects of poor controlled release effect, easiness in causing secondary pollution, easiness in collapse and the like during application, the invention discloses a preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification. Solid-phase controlled-release carbon source composite particles can be taken as a filling medium in in-situ or ex-situ remediation of underground water nitrate pollution. When the solid-phase controlled-release carbon source composite particles are taken as a denitrification bacteria carrier, long-acting controllable organic carbon source release is provided. A degradable polymer and a natural plant are taken as carbon source releasing components, and a non-degradable polymer is taken as a framework material, so that a preparation process is relatively simple, and high mechanical performance and high efficiency of nitrogen removal by denitrification are achieved.

Description

technical field [0001] The invention relates to a preparation method of controlled-release carbon source composite particles for biological denitrification and denitrification, and belongs to the technical field of water treatment. Background technique [0002] Groundwater in most areas of my country suffers from nitrate nitrogen pollution to varying degrees. Because the soil lacks the ability to absorb nitrates, these nitrates will seep into the groundwater. Surveys in recent years have shown that groundwater is polluted by nitrates at home and abroad, and in some areas, the pollution has been very serious. [0003] At present, there are many methods for treating nitrate nitrogen in water bodies, mainly divided into physical and chemical methods and biological denitrification methods. Compared with physical and chemical methods, biological denitrification method has the characteristics of low energy, high efficiency, and no secondary pollution. It does not simply concentra...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L97/02C08L23/06C08L23/12C08L25/06C08K13/02C08K5/1535C08K3/32C08K3/30C08K3/16C02F3/34
Inventor 张以河张锐余黎王鹤立
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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