Method for removing heavy metal impurities in biogas slurry
A technology for heavy metals and biogas slurry, which is applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., and can solve the problems of restricted application and separation difficulties.
Inactive Publication Date: 2021-06-15
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology
It can be seen that HA is an efficient and reversible heavy metal adsorbent, but the difficulty of separation restricts its application.
Method used
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Embodiment 1
[0052] A method for removing heavy metal impurities in biogas slurry, comprising the following steps:
[0053] S1 Preparation of Humic Acid Encapsulated Fe with Different Molecular Weights 3 o 4 Nanoparticles, and count the characterization of each nanoparticle;
[0054] S2 establishes the regulatory rules of different nanoparticles for characterization, and screens out efficient nanoparticle groups;
[0055] S3 For the screened high-efficiency nanoparticle group, Cu(II) and Zn(II) in the biogas slurry concentrate with a determined concentration are used as standard compounds to construct an adsorption model for Cu(II) and Zn(II) by nanoparticles;
[0056] S4 For the obtained adsorption model, use Cu(II) and Zn(II) in the biogas slurry concentrate with a certain concentration as standard compounds to construct a desorption model for nanoparticles, and determine that the high-efficiency nanoparticles in the nanoparticle group can be recovered;
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Abstract
The invention discloses a method for removing heavy metal impurities in biogas slurry. The method comprises the following steps: S1, preparing different nanoparticles, and carrying out statistical characterization; S2, establishing a regulation and control rule, and screening a nanoparticle group; S3, constructing an adsorption model of the nanoparticles; S4, constructing a desorption model of the nanoparticles, and judging efficient nanoparticles; and S5, carrying out an amplification experiment, counting an adsorption rate and a recovery rate, and recovering the high-efficiency nanoparticles. The method of the invention has the beneficial effects that the nanoparticles with different molecular weights are prepared firstly, then the regulation and control rule is constructed according to the characterization of the nanoparticles, the efficient nanoparticle group is screened out, and then the efficient nanoparticle group is screened through the adsorption model and the desorption model in sequence, so the efficient nanoparticles are accurately screened out; and moreover, the feasibility of recovering the nanoparticles is provided by the desorption model, and finally, impurities can be efficiently removed and the adsorbent can be recovered in practical application through an amplification experiment.
Description
technical field [0001] The invention relates to the field of nano particle purification, in particular to a method for removing heavy metal impurities in biogas slurry. Background technique [0002] Biogas slurry is the liquid part of the solid-liquid separation of the residue after biogas engineering fermentation, and is an ideal raw material for the preparation of liquid organic fertilizer. However, the biogas slurry has a high water content, low fertilizer components, and contains a variety of heavy metals, resulting in a waste rate of up to 70% of the biogas slurry. Through the membrane concentration of biogas slurry, the nutrient content can be increased to 4-7 times that of the original solution, while the volume is only 1 / 10-1 / 8 of the original solution, and the membrane-produced water meets the "Discharge Standard for Pollutants in Livestock and Poultry Breeding Industry GB18956-2001" 》, which is an important direction of resource utilization of biogas slurry. [0...
Claims
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IPC IPC(8): C02F1/28B01J20/24B01J20/28B01J20/30C02F101/20
CPCC02F1/286B01J20/24B01J20/28009B01J20/28004B01J20/3085B01J20/3071C02F2101/20
Inventor 杨郭邢波周倩刘兴勇袁基刚
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING