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Preparation method and application of attapulgite/nano-iron composite material-microorganism coupled body

A technology of attapulgite and composite material, which is applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of preventing agglomeration and forming agglomerates and improving the adsorption performance

Active Publication Date: 2014-04-30
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] According to the defects of the prior art, the present invention provides a preparation and application of attapulgite / nano-iron composite material-microbial coupling body. The attapulgite / nano-iron composite material-microbial coupling body prepared by the method solves the problem of poor stability of nano-iron, It is easy to condense during the reaction, the proportion of ammonia nitrogen in the denitrification product is too high, and the autotrophic denitrification bacteria need electron donors during denitrification, which can effectively control the nitrate pollution in the water body

Method used

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  • Preparation method and application of attapulgite/nano-iron composite material-microorganism coupled body
  • Preparation method and application of attapulgite/nano-iron composite material-microorganism coupled body

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Embodiment

[0040] Embodiment: a method for preparing attapulgite / nanometer iron composite material-microbial coupling body, the specific steps are as follows:

[0041] (1) Grind and sieve untreated attapulgite (200 mesh) to obtain attapulgite with a particle size of ≤200 mesh, weigh 10.0g of attapulgite with a particle size of ≤200 mesh, and use 100mL of distilled water to make 10wt % suspension, add 0.3g sodium hexametaphosphate dispersant to the suspension, magnetically stir for 0.5h, 60~80℃ ultrasonic treatment for 0.5h, after standing for 2h, take out the upper milky white suspension at a speed of 3000~3500r / min Centrifuge for 10 to 20 minutes, then dry at 105°C for 3 hours, and pass through a 200-mesh sieve to obtain nano-sized attapulgite crystals with a particle size of ≤200 mesh;

[0042] (2) Weigh 10.0 g of nano-scale attapulgite crystals purified in step (1), modify them with 100 mL of hydrochloric acid with a concentration of 2 mol / L, stir them magnetically for 2 h, and ultras...

Embodiment 1

[0051] The application of the attapulgite / nano-iron composite material-microbial coupling body prepared in Example 1 in the treatment of polluted groundwater is specifically to apply the attapulgite / nano-iron composite material-denitrifying bacteria coupling body to the existing available In permeable reaction wall technology, sewage extraction treatment technology and injection repair method technology, the specific operations are as follows:

[0052] (1) Permeable reactive wall technology

[0053] Removing groundwater nitrate pollution The permeable reaction wall is a passive reaction zone filled with attapulgite / nano-iron composite material-microbial coupling material. When the polluted groundwater passes through the reaction zone, the physical, chemical and biological effects of the reaction materials The nitrate is adsorbed and degraded by the material. Specifically, the attapulgite / nanometer iron composite material-microbial coupling body and soil are fully mixed at a r...

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Abstract

The invention provides a preparation method and an application of an attapulgite / nano-iron composite material-microorganism coupled body. The preparation method comprises the following steps: purifying attapulgite with distilled water and sodium hexametaphosphate, modifying by hydrochloric acid, conducting a centrifugal process, washing, drying, putting into a FeSO4 solution, soaking for 24-72 hours, conducting the centrifugal process, adding ethanol into a solid after the centrifugal process under the protection of argon gas, uniformly mixing, dropwise adding KBH4 for full reaction of Fe<2+>, conducting the centrifugal process, washing and drying deposits after the centrifugal process, and producing a coupling reaction with alcaligenes eutrophus to obtain a solid matter as the attapulgite / nano-iron composite material-microorganism coupled body. According to the coupled body, the shortcomings of poor nano-iron stability, poor dispersity, high possibility of conglomeration and the like are overcome, the defect of secondary pollution on a water body due to ammonia nitrogen generated during reaction of an attapulgite / nano-iron composite material with nitrate is avoided, and microorganisms basically cannot be poisoned.

Description

technical field [0001] The invention relates to sewage treatment materials in environmental protection, specifically a method for preparing attapulgite / nano-iron composite material-microbial coupling body by using attapulgite / nano-iron composite material and microorganisms for water bodies polluted by nitrates, And the application of the prepared attapulgite / nanometer iron composite material-microbial coupling body in sewage treatment. Background technique [0002] The harm to human health caused by excessive nitrate concentration in the water body is mainly manifested in the following aspects: (1) Nitrate generates nitrite through the action of nitrate reductase in the human body, and nitrite reacts with hemoglobin in the blood, which has the function of transmitting oxygen The formation of methemoglobin will cause the human body to suffer from methemoglobinemia, and even lead to suffocation and death in severe cases; (2) Nitrate and nitrite will form under the action of ni...

Claims

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Application Information

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IPC IPC(8): C02F3/34
Inventor 冯雪李青云林莉吴敏谢雯静
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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