Carbon release material for remedying underground water nitrate nitrogen pollution and preparation method of carbon release material
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A nitrate nitrogen and groundwater technology, applied in water pollutants, polluted groundwater/leachate treatment, chemical instruments and methods, etc. The effect of good carbon stability, good biocompatibility and high compressive strength
Inactive Publication Date: 2017-06-09
HEBEI UNIV OF ENG
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Problems solved by technology
Disadvantages: It cannot convert nitrate into harmless substances, so it requires post-treatment of concentrated nitrate, and has low efficiency, poor selectivity, high investment and high operating costs
Disadvantages: The problem is that while the nitrate is reduced to nitrogen molecules, part of the nitrate is reduced to ammonium ions, the product is difficult to control, and is greatly affected by environmental factors, and the operating cost is high
The product N produced by biological denitrification 2 Stable, non-toxic, relatively low treatment cost, and good treatment effect; however, the heterotrophic denitrification process requires sufficient organic carbon sources as electron donors to occur. Insufficient organic carbon sources have always plagued biochemical denitrification treatment.
In view of this problem, modern researchers set out to solve it from the following two aspects: one is to use autotrophic denitrification that does not require organic carbon sources, and use the hydrogen produced by the cathode of the electrode biofilm reactor as the electron donor Nitrate in water is used as an electron acceptor for autotrophic denitrification. This method has a very limited ability to remove nitrate nitrogen. The second is to add natural carbon sources, such as sawdust, newspapers, straw, etc., but such carbon sources are easy to Blockage, uncontrollable carbon release rate and easy to cause excessive organic matter in the effluent, resulting in secondary pollution
The unsustainable and stable supply of these carbon sources seriously affects the effect of groundwater bioremediation
Method used
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preparation example Construction
[0040] Preparation technique of the present invention comprises the steps:
[0041] A. 3 parts by weight of the carbon source material are pulverized into fine powder with a pulverizer, dried to constant weight, and sealed for storage.
[0042] Among them, the carbon source material is one or more of corn starch, wheat starch, newspaper, wheat straw, corn straw, straw, dead branches and leaves, sawdust, cotton, loofah, bagasse, degradable lunch box, and wood chips .
[0043] B. Put 1-5 parts by weight of the skeleton material at a temperature above 80° C., and keep stirring until it dissolves.
[0044] Wherein, the skeleton material is one or more of insoluble skeleton materials, waxy skeleton materials, and hydrophilic gel skeleton materials.
[0045] Preferably, commonly used insoluble skeleton materials include: ethyl cellulose, polyethylene, polypropylene, polysiloxane and polyoxyethylene, etc.;
[0046] Commonly used waxy skeleton materials are: beeswax, hydrogenated v...
Embodiment
[0054] In this experiment, the choice of carbon release components is cheap and easy to obtain corn stalks; the skeleton material is used to improve the mechanical properties of the slow-release material, and polyvinyl alcohol (PVA) is used; during the preparation of the material, a certain amount of Amylase can significantly change its carbon release rate. In this study, five amylases, α-amylase, β-amylase, γ-amylase, cellulase, and xylanase, were used as additives for experiments. The mechanical properties, structural properties, carbon release properties, and denitrification performance of each group of experimental products were analyzed and studied experimentally.
[0055] According to the specific gravity of straw and PVA, the amylase added and the amount of amylase added, the prepared slow-release carbon material was divided into No. 25 material, which was divided into five groups according to the ratio of straw to PVA, and the specific material ratio as follows:
[00...
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Abstract
The invention discloses a carbon release material for remedying underground water nitrate nitrogen pollution and a preparation method of the carbon release material, and relates to the technical field of underground water remediation. The carbon release material comprises the following substances in parts by weight: 100 parts of water, 3 parts of a carbon source material, 1-5 parts of a framework material and 0-0.1 part of enzymes, wherein the carbon source material is wrapped by the framework material; the enzymes are used for controlling carbon release of the carbon release material. The invention provides the novel, efficient and economically feasible controlled carbon release material and the preparation method thereof, and the carbon release material can be also used as a carrier of microorganisms when used in in-situ underground water remediation of a permeable reactive barrier, meanwhile has technical advantages of being good in carbon release stability, high in pressure-resistance strength, good in biocompatibility, low in raw material price and the like and is applicable to various types of underground water polluted by pollutants; together with microorganisms, the purpose of continuously and stably removing underground water nitrate nitrogen can be achieved, and meanwhile a sustainable green and environmental-friendly way can be provided for solving the problem of straw in rural areas.
Description
technical field [0001] The invention relates to the technical field of groundwater remediation, in particular to a carbon-releasing material used in the remediation of nitrate nitrogen pollution in groundwater and a preparation method thereof Background technique [0002] Due to the rapid development of modern industrial technology, the pollution of nitrate in groundwater has become an environmental problem that has attracted much attention in today's society. After nitrate is ingested by the human body, it can cause some cancers and seriously affect the healthy life of human beings. [0003] At present, the methods for removing nitrate nitrogen pollution mainly include the following three technologies: [0004] Physical remediation technology: intercept nitrate in the water body through osmosis, adsorption and exchange, without changing the existing form of nitrogen in the water body, mainly including distillation, membrane separation and ion exchange methods. Disadvantage...
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Application Information
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