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Immobilized microbial material for treating wastewater containing heavy metal ions and preparation method

A technology for immobilizing microorganisms and microorganisms, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of easily destroying the structure of indigenous microbial communities and affecting the restoration effect

Pending Publication Date: 2021-09-10
佛山市南海区苏科大环境研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the introduction of exogenous microorganisms into the restored water and soil can easily destroy the structure of the native microbial community, cause competition between the native microorganisms and the exogenous microorganisms, affect the restoration effect, and bring potential environmental risks

Method used

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  • Immobilized microbial material for treating wastewater containing heavy metal ions and preparation method
  • Immobilized microbial material for treating wastewater containing heavy metal ions and preparation method
  • Immobilized microbial material for treating wastewater containing heavy metal ions and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The immobilized microbial material provided in this embodiment includes an embedding framework and urease-producing microorganisms embedded in the embedding framework, urea and a buffer.

[0041] The immobilized microbial material also includes biochar, which is embedded on the embedding framework and embedded in the embedding framework.

[0042] The embedding matrix is ​​cross-linked with sodium alginate and calcium salts.

[0043] In this example, the buffer is dipotassium hydrogen phosphate (KH 2 PO 4 ).

[0044] Urease-producing microorganisms are fed with indigenous urease-producing microorganisms, and the OD in the bacteria solution is 600 =1.5.

[0045] Biochar was prepared by pyrolysis of rice straw at 300 °C for 3 h in an anaerobic environment after natural air drying, with a mesh size of 300 mesh.

[0046] The viscosity-average molecular weight of sodium alginate is 185,000.

[0047] The immobilized microbial material of this example is prepared by the f...

Embodiment 2

[0053] This example provides immobilized microbial materials. The difference from Example 1 is that in the suspension in step (2), 1% sodium alginate, 3% biochar, 8% urea, KH 2 PO 4 1% and 5% of the indigenous urease-producing microorganism bacterial solution and the balance is deionized water. All the other are with embodiment 1.

Embodiment 3

[0055] This example provides immobilized microbial materials. The difference from Example 1 is that in the suspension in step (2), 3% sodium alginate, 1% biochar, 5% urea, KH 2 PO 4 2%, 10% of the indigenous urease-producing microorganism bacterial liquid and the balance are deionized water. All the other are with embodiment 1.

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Abstract

The invention relates to an immobilized microbial material for treating wastewater containing heavy metal ions and a preparation method. The immobilized microbial material comprises an embedding skeleton, and urease-producing microorganisms, urea and a buffering agent which are embedded in the embedding skeleton. According to the immobilized microbial material, the urea and the urease-producing microorganisms are embedded in the embedding skeleton, so that the problem that the urea is prone to hydrolyzing when being added into the acid wastewater is effectively solved, meanwhile, the buffer agent is introduced and embedded in the embedding skeleton, so that the stable existence of the urea is effectively achieved, and the MICP process can be smoothly carried out. When being used for treating wastewater containing heavy metal ions, the immobilized microbial material is high in heavy metal ion removal rate, has good desorption-adsorption capacity, can be repeatedly used for multiple times, reduces the treatment cost of the heavy metal wastewater, and has good engineering application value.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an immobilized microbial material for wastewater containing heavy metal ions and a preparation method. Background technique [0002] Cadmium (Cd) is a very harmful heavy metal element. At present, cadmium pollution mainly comes from mining, electroplating, battery and other production processes. Animals and plants endanger human health through the food chain. At present, small electroplating companies still use the hydroxide precipitation method to remove heavy metals in the water after the network is broken. 2+ 、Cr 2+ and other heavy metal ions fail to reach the standard, and secondary treatment is required. In addition, Ca in the water body 2 + , Fe 2+ The ion concentration is too high, which has potential ecological hazards. [0003] Among the existing remediation methods for heavy metal-contaminated water bodies, biological methods have signific...

Claims

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Application Information

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IPC IPC(8): C12N11/14C12N11/10C12N11/04C02F3/34C02F101/20
CPCC12N11/14C12N11/10C12N11/04C02F3/34C02F2101/20
Inventor 胡嘉源史广宇李尚珂余志强
Owner 佛山市南海区苏科大环境研究院