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Dual-immobilized rapid-starting functional carbon source filler and preparation method thereof

A fast-starting and functional technology, applied in the field of repairing fillers, can solve the problems of not giving full play to the advantages of agricultural waste, inability to adjust flexibly, and slow start-up of the repairing process, so as to achieve good cation exchange and adsorption capacity, and avoid ammonia nitrogen concentration and chroma Elevated effect

Pending Publication Date: 2018-05-18
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Agricultural waste can be used as a carbon source material for nitrate removal, but the current carbon source filler based on agricultural waste has the disadvantages of low production output, low content of effective repair matrix, and slow start-up of the repair process. Practical engineering application of agricultural waste as filling matrix to remediate nitrate pollution in groundwater
[0005] Chinese patent CN102627822B discloses a modified PVA-starch controlled-release carbon source material and its preparation method, wherein the raw materials of the modified PVA-starch controlled-release carbon source material are composed of: 23-52 parts of PVA, corn starch 27-49 parts, 3-17 parts of boric acid, 8-30 parts of attapulgite, but because PVA material is a polymer plastic material, it has potential environmental hazards. At the same time, using PVA as a carbon source raw material does not fully utilize agricultural waste Advantages as an organic carbon source; in addition, this method has certain operability in the laboratory, but in practice there are still problems such as cumbersome material production and high preparation costs, and the freezing technology cannot be produced in batches, so it is not suitable for large-scale promotion and use
[0006] Chinese patent CN104098083A discloses a method for preparing porous nano-carbon materials using biomass as a carbon source. This material relates to a method for preparing nano-carbon materials using biomass loofah as a carbon source. The material has a good denitrification effect, but the The technical solution requires multi-step preparation under conditions such as inert gas, ultra-high temperature environment, and acidic environment. The production environment has high requirements and the process is difficult to control. This will lead to high timeliness and cost of material production, and ultra-high temperature environment, The ultrasonic environment is difficult to realize in field application, which is not conducive to large-scale promotion and application
However, the biochar in the above materials is anaerobically pyrolyzed at 300-700 °C, which easily leads to a decrease in the available biomass of the filler, which is not conducive to the enrichment of protists.
Furthermore, the filler has a single shape and size, and cannot be flexibly adjusted according to actual needs.
Finally, during the preparation of the filler, the biological suspension needs to be ground to 200um, which must be carried out under laboratory conditions, which is difficult to control in practical applications
[0008] The existing filler manufacturing process is cumbersome, the output rate is low, and the production cost is high. The shape and size of the filler cannot be flexibly adjusted according to actual needs. The effective utilization rate of waste is not high

Method used

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  • Dual-immobilized rapid-starting functional carbon source filler and preparation method thereof
  • Dual-immobilized rapid-starting functional carbon source filler and preparation method thereof
  • Dual-immobilized rapid-starting functional carbon source filler and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]In this example, the fast-start double-immobilized quick-start functional packing used for adsorption and immobilization of groundwater pollution remediation and enhanced by indigenous efficient denitrification microorganisms is as follows:

[0037] (1) Rinse the peanut shells and walnut shells twice with clean water, ventilate and dry for 3-4 days, and set aside;

[0038] (2) pulverizing the natural cellulose raw material obtained in step (1) to 20 orders for subsequent use;

[0039] (3) Sponge iron is crushed to 80 orders for subsequent use;

[0040] (4) Mix the mixture of peanut shells and walnut shells, zeolite, safflower powder, sponge iron, attapulgite, and ordinary Portland cement in proportion and mix well, add an appropriate amount of water until the raw materials are viscous, and start extrusion Compression molding machine, the raw materials are gradually put into the feeding port, wherein the composition and mass percentage of the filler are as follows: 55% m...

Embodiment 2

[0047] In this example, the preparation process of the fast-start dual-immobilization functional filler for adsorption and immobilization of groundwater pollution remediation and enhancement of indigenous high-efficiency denitrification microorganisms is as follows:

[0048] (1) Rinse the mixture of peanut shells and walnut shells with clean water twice, ventilate and dry for 3-4 days, and set aside;

[0049] (2) pulverizing the natural cellulose raw material obtained in step (1) to 16 orders for subsequent use;

[0050] (3) Sponge iron is crushed to 70 orders for subsequent use;

[0051] (4) According to the proportion of fillers, mix peanut shell and walnut shell powder, zeolite, safflower powder, sponge iron, attapulgite, and ordinary Portland cement in proportion and mix them well, and add appropriate amount of water until the raw materials are Viscous, start the extrusion molding machine, and gradually put the raw materials into the feeding port. Among them, the composit...

Embodiment 3

[0059] In this example, the preparation process of the fast-start dual-immobilization functional filler for adsorption and immobilization of groundwater pollution remediation and enhancement of indigenous high-efficiency denitrification microorganisms is as follows:

[0060] (1) Rinse the mixture of peanut shells and walnut shells with clean water twice, ventilate and dry for 3-4 days, and set aside;

[0061] (2) pulverizing the natural cellulose raw material obtained in step (1) to 16 orders for subsequent use;

[0062] (3) Sponge iron is crushed to 90 orders for subsequent use;

[0063] (4) According to the proportion of fillers, mix peanut shell and walnut shell powder, zeolite, safflower powder, sponge iron, attapulgite, and ordinary Portland cement in proportion and mix them well, and add appropriate amount of water until the raw materials are Viscous, start the extrusion molding machine, and gradually put the raw materials into the feeding port. Among them, the composi...

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Abstract

The invention relates to a dual-immobilized rapid-starting functional carbon source filler and a preparation method thereof. The filler comprises, by weight, 45 to 55% of rigid cellulose-like agricultural wastes, 12 to 14% of sponge iron, 10 to 15% of raw mineral materials, 3 to 5% of a natural binder, 10 to 20% of attapulgite and 6 to 10% of Portland cement and is extruded and molded through an extruding machine. Compared with the existing filler, the dual-immobilized rapid-starting functional carbon source filler realizes combination of physical absorption, chemical reduction and bioremediation so that the filler has a dual-immobilization function of adsorption immobilization and indigenous microorganism enhancement, nutrient salts, electron donors and microbial immobilization carriers satisfying the microbial growth demands are provided, the denitrification reaction is fast started and secondary pollution is prevented. The preparation method is convenient, moldability is good, economic feasibility, safety and no pollution are realized, the problem of groundwater bioremediation is effectively solved, the resource recycling is realized and a wide application prospect is realized.

Description

technical field [0001] The invention relates to a repair filler, in particular to a double-immobilized quick-start function carbon source filler and a preparation method thereof. Background technique [0002] Nitrate pollution of groundwater is universal. In response to this problem, in addition to ex-situ treatment, adding chemical reducing agents and organic carbon to the groundwater, and then reducing nitrate to nitrogen from the groundwater, is also one of the methods commonly used in academia and engineering. . Sponge iron as a filler has been successfully used in the in-situ remediation of nitrate pollution in groundwater, but ammonia nitrogen is easily generated during the process, causing secondary pollution, and it is easy to agglomerate, resulting in blockage of the filling reaction zone and unstable nitrate removal efficiency. External carbon source is an important factor affecting the efficiency and feasibility of in-situ treatment of groundwater nitrate. Some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F103/06C02F101/16
CPCC02F1/281C02F1/283C02F1/42C02F3/00C02F2001/425C02F2101/163C02F2103/06
Inventor 张雯周念清夏学敏
Owner TONGJI UNIV
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