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

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...

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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

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