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Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge

A technology for urban domestic sewage and activated sludge, which is applied in water/sludge/sewage treatment, biological water/sewage treatment, chemical instruments and methods, etc. High cost, complex management and other problems, to achieve the effect of excellent physical adsorption and flocculation capacity, low cost and low energy consumption

Active Publication Date: 2013-01-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the extensive application of activated sludge sewage treatment technology in actual projects, people have found that there are some shortcomings in the AS method sewage treatment process. Complex, prone to sludge bulking, process equipment cannot meet the requirements of high efficiency and low consumption; the remaining sludge needs to be treated harmlessly, which increases investment
With the increasingly stringent sewage discharge standards, there are higher requirements for the discharge of nitrogen, phosphorus and other nutrients in sewage. The traditional sewage treatment process with the function of nitrogen and phosphorus removal is mainly based on activated sludge method, which is difficult to meet the standard, and the The process is not suitable for water quality with large changes in water quality
However, the cost of replacement process and reconstruction and expansion is high, and it is difficult to realize in a short time. Therefore, it is of great application value to improve and strengthen the existing activated sludge process to meet the increasingly high environmental protection requirements.

Method used

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  • Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge
  • Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge
  • Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take FeCl 3 Dissolve 6.5g and 2.0g of sodium citrate in 200mL of ethylene glycol, then add 10.0g of sodium acetate while stirring, stir for 30 minutes, then seal it in a 500mL Teflon-lined reactor and heat to 200°C, After continuing for 10 hours, cool to room temperature, take out the reactants, rinse with ethanol and deionized water for 3 times, dry and sieve to obtain particles with a particle size of 80-400nm, that is, MN magnetic nanomaterials. Scanning electron microscope photos as figure 1 As shown, the appearance of the obtained material is circular and nanoscale; the XRD spectrum is as follows figure 2 As shown, the main components of MN magnetic nanomaterials are iron and oxygen, and iron mainly exists in the form of ferric iron; the obtained MN magnetic nanomaterials are used for the sewage treatment in the next step.

[0043] (2) Take 20L of urban domestic wastewater from the sewage treatment plant every day and add it to the R2 reactor. The pollutant...

Embodiment 2

[0049] (1) Take FeCl 3 Dissolve 7.5g and 2.0g of sodium citrate in 200mL of ethylene glycol, then add 11.0g of sodium acetate while stirring, stir for 30 minutes, then seal it in a Teflon-lined reactor, heat to 220°C, and continue After 10h, cool to room temperature, take out the reactant, and wash with ethanol and deionized water several times to obtain MN magnetic nanomaterial particles;

[0050] (2) Take 20L of domestic wastewater from the sewage treatment plant every day and add it to the reactor. Add 0.1g / (L·week) MN magnetic nanomaterial particles to the solution at room temperature; use an air compressor to aerate and maintain at 0.1m 3 / h, the HRT is 12 hours at room temperature, and the efficiency of pollutants in wastewater is improved. After the completion of the reaction, it was tested and calculated that the removal rate of COD in the R2 reactor finally reached more than 95%, and the removal rate of R1 was relatively low.

[0051] In order to have a better con...

Embodiment 3

[0053] (1) Take FeCl 3 Dissolve 6.5g and 2.2g of sodium citrate in 240mL of ethylene glycol, then add 12.0g of sodium acetate while stirring, stir for 30 minutes, then seal it in a polytetrafluoroethylene-lined reactor, heat to 180°C, and continue After 12 hours, cool to room temperature, take out the reactant, and wash with ethanol and deionized water several times to obtain MN magnetic nanomaterial particles;

[0054] (2) Take 20L of domestic wastewater from the sewage treatment plant every day and add it to the reactor. Add 0.12g / (L·week)MN magnetic nanomaterial particles into the solution at room temperature; use an air compressor to aerate to maintain at 0.1m 3 / h, the HRT is 6 hours at room temperature, and the efficiency of pollutants in wastewater is improved. After the reaction, it was tested and calculated that the removal rate of COD in the R2 reactor finally reached more than 89%, which was higher than the removal rate of R1.

[0055] In order to have a better ...

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Abstract

The invention relates to a method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge, which comprises the steps of: adding a magnetic iron oxide nanomaterial into an activated sludge system used for treating the urban domestic sewage, wherein the dosage of the magnetic iron oxide nanomaterial is 0.05-1.0g / (L. week); and under the conditions of room temperature and 4-12hours of hydraulic retention time, fully carrying out aeration and completely mixing so as to lead the activated sludge in a reactor to fully react with pollutants. The experimental result proves that after the magnetic nanomaterial is added into the sewage, the treatment efficiency of the pollutants can be effectively improved, and the microbial activity of the activated sludge is remarkably increased. The method is simple in technology and mild in reaction conditions, and can be carried out at the room temperature and normal pressure; and the method is safe and harmless to the environment, and is convenient for engineering application.

Description

technical field [0001] The invention relates to a method for using magnetic nanometer materials to strengthen activated sludge to treat urban domestic sewage, and belongs to the technical field of environmental chemistry and waste water treatment. Background technique [0002] Activated Sludge (Activated Sludge, AS) is an aerobic biological treatment of sewage, invented by Clark and Gage in England in 1912, which refers to the use of artificially domesticated and cultivated microbial populations. It grows in a suspended state in an artificially enhanced environment, decomposes and oxidizes the biodegradable organic substances in the sewage, thereby purifying the sewage. Today, the activated sludge process and its derivative improvement processes are the most widely used methods for treating municipal sewage. It can remove dissolved and colloidal biodegradable organic matter, suspended solids and other substances that can be adsorbed by activated sludge from sewage, and can ...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/30
CPCY02W10/10
Inventor 倪寿清
Owner SHANDONG UNIV
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