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A zeolite-magnetite composite material, its preparation method and its application method for biological nitrogen and phosphorus removal

A composite material and biological denitrification technology, applied in the field of environmental protection materials and biological wastewater treatment, can solve problems such as increasing treatment costs and chemical pollution, and achieve the effects of eliminating carbon source addition, good biocompatibility, and efficient synthesis

Active Publication Date: 2021-08-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing sewage biological denitrification and phosphorus removal process represented by A2 / O is difficult to meet the increasingly stringent discharge requirements, and the denitrification and phosphorus removal by adding carbon sources will increase the treatment cost and introduce new chemical pollution. Therefore, It is imperative to develop a new type of biological carrier filler to improve the technical level of biological nitrogen and phosphorus removal in sewage

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  • A zeolite-magnetite composite material, its preparation method and its application method for biological nitrogen and phosphorus removal
  • A zeolite-magnetite composite material, its preparation method and its application method for biological nitrogen and phosphorus removal
  • A zeolite-magnetite composite material, its preparation method and its application method for biological nitrogen and phosphorus removal

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Embodiment 1

[0032] The preparation method of the present embodiment zeolite-magnetite composite material comprises the following steps:

[0033] 1) The zeolite and the ferrous sulfate solution that the weight volume ratio is 1g:1mL are fully stirred and mixed to react, so that the Na on the zeolite + Fe in solution 2+ Complete replacement, the concentration of ferrous sulfate solution used is 3mol / L, and the reaction time is 2h to obtain iron-based zeolite;

[0034] 2) Slowly add 1mL of hydrogen peroxide solution to the mixture obtained in step 1) under the ice-bath condition of the ice-water mixture at 0°C, and keep stirring the above-mentioned mixed system to make the Fe 2+ Fully react with hydrogen peroxide to generate ferric oxide and deposit on the surface of the zeolite and in the inner pores, wherein the mass fraction concentration of the hydrogen peroxide solution is 30%, and the iron-based zeolite leached Fe 2+ The reaction time with hydrogen peroxide is 2h;

[0035] 3) After ...

Embodiment 2

[0038] The preparation method of the present embodiment zeolite-magnetite composite material comprises the following steps:

[0039] 1) The cation-exchange zeolite and ferrous sulfate solution with a weight-to-volume ratio of 1g:3mL are fully stirred and mixed for reaction, so that the Na on the zeolite + Fe in solution 2+ complete replacement, the concentration of ferrous sulfate solution is 1mol / L, and the reaction time is 5h to obtain iron-based zeolite;

[0040] 2) Slowly add 3mL of hydrogen peroxide solution to the mixture obtained in step 1) under the ice-bath condition of ice-water mixture at 0°C, and keep stirring the above-mentioned mixed system to make the Fe 2+ It fully reacts with hydrogen peroxide to generate ferric oxide and deposits on the surface of zeolite and in the inner pores, wherein the mass fraction concentration of hydrogen peroxide solution is 15%, and the Fe leached from iron-based zeolite 2+ The reaction time with hydrogen peroxide is 5h;

[0041]...

Embodiment 3

[0044] The preparation method of the present embodiment zeolite-magnetite composite material comprises the following steps:

[0045] 1) The cation-exchange zeolite and ferrous sulfate solution with a weight-to-volume ratio of 1g:2mL are fully stirred and mixed for reaction, so that the Na on the zeolite + Fe in solution 2+ complete replacement, the concentration of ferrous sulfate solution is 2mol / L, and the reaction time is 3.5h to obtain iron-based zeolite;

[0046] 2) Slowly add 2 mL of hydrogen peroxide solution to the mixture obtained in step 1) under the condition of an ice-water mixture at 0° C. 2+ It fully reacts with hydrogen peroxide to generate ferric oxide and deposits on the surface of zeolite and in the internal pores. Among them, the mass fraction concentration of hydrogen peroxide solution is 25%, and the Fe 2+ The reaction time with hydrogen peroxide is 3.5h;

[0047] 3) After the reaction is fully completed, use a magnetic field strength of 0.2T to magneti...

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Abstract

The invention provides a zeolite-magnetite composite material, a preparation method and a use method for biological nitrogen and phosphorus removal. The preparation method comprises the following steps: fully stirring and mixing zeolite and ferrous sulfate solution; under the condition of ice bath at 0°C, slowly adding hydrogen peroxide solution to the above mixed solution, and continuously stirring, the obtained iron-based zeolite leached Fe 2+ Fully react with hydrogen peroxide to generate nano-ferric oxide and deposit on the surface of the zeolite and in the internal pores; after the reaction is completed, magnetically separate and wash with ethanol and then vacuum-dry to obtain a zeolite-magnetite composite material. The present invention also provides a method for using the above-mentioned zeolite-magnetite composite material for biological denitrification and dephosphorization. Microorganisms can attach to the composite material, and the difference in oxygen concentration between the inner and outer membranes produced by the film formation can realize synchronous nitrification and denitrification, anaerobic The synchronous characteristics of phosphorus release and aerobic excess phosphorus absorption can also further recover composite materials through magnetic separation, reducing operating costs.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials and biological wastewater treatment thereof, and in particular relates to a zeolite-magnetite composite material, a preparation method and a use method for biological nitrogen and phosphorus removal. Background technique [0002] With the rapid development of my country's economic construction and urbanization level, the amount of sewage generated and the collection and treatment rate are increasing year by year. Since the 1990s, with the rapid development of my country's economic construction and urbanization level, the amount of sewage production has increased day by day, and the corresponding sewage collection and treatment rate has also gradually increased, resulting in a large amount of sludge. According to the "National Urban and Rural Construction Statistical Yearbook" issued by the Ministry of Housing and Urban-Rural Development in 2019 and other relevant statist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F101/16C02F101/10
CPCC02F3/30C02F3/302C02F3/308C02F2101/105C02F2101/16
Inventor 柴晓利戴晓虎陆斌
Owner TONGJI UNIV
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