A method for separating and enriching Pb2+ in biogas slurry by using lead ion imprinted membrane

A technology for separation and enrichment of lead ions, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of non-recyclable heavy metals, complicated process, secondary pollution, etc., and achieve labor cost saving and operation Simple, easy-to-maintain effects

Active Publication Date: 2016-01-06
INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this treatment method has a good treatment effect, the process is complicated, and it is easy to generate a large amount of waste residue, causing secondary pollution, and the heavy metals treated cannot be recycled.

Method used

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  • A method for separating and enriching Pb2+ in biogas slurry by using lead ion imprinted membrane
  • A method for separating and enriching Pb2+ in biogas slurry by using lead ion imprinted membrane
  • A method for separating and enriching Pb2+ in biogas slurry by using lead ion imprinted membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of embodiment 1 lead ion imprinted membrane

[0028] With dibenzo-18-crown-6 as porogen, Pb(NO 3 ) 2 As the template molecule, the lead ion imprinted membrane was prepared with sodium carboxymethylcellulose (CMC) as the substrate; figure 2 Electron scanning electron micrograph of lead ion imprinted membrane; CMC does not add porogen dibenzo-18-crown ether-6 and template molecule Pb(NO 3 ) 2 When , the membrane has a compact structure (a); when the porogen dibenzo-18-crown-6 and the template molecule Pb(NO 3 ) 2 When the viscosity of the system decreases, the diffusion speed of the solvent is accelerated to form a loose (figure b) and ravine-like membrane structure (figure c), and the radius of the hole is about 0.130~0.170nm. Since the template molecule Pb(NO) in the lead ion imprinted membrane 3 ) 2 Self-assembly with the porogen dibenzo-18-crown-6, the inner cavity is formed according to the imprinted ion Pb 2+ The size and shape of the format...

Embodiment 2

[0039] Example 2 Experimental analysis of the removal effect of heavy metal Pb in the anaerobic digestion solution of livestock and poultry breeding sewage

[0040] The experiment was carried out at 298K, the lead ion imprinted membrane was used as the diaphragm between the two electrolytic cells, the left chamber was the pretreated anaerobic digested biogas slurry, and the right chamber was 0.01mol L -1 lead-containing solution, the volume of the solution in the two electrolytic cells is 100mL, and the effective membrane area of ​​the lead ion imprinted membrane is 10cm 2 , take the biogas fluid of the left ventricle every 10 minutes of infiltration (the liquid volume is 5mL), take a total of 5 times, and measure the heavy metal Pb in the left ventricle respectively 2+ The content is shown in Table 3.

[0041] Table 3 The small-scale test data of the imprinted membrane on the heavy metal Pb imprinting effect in the anaerobic digestion stock solution

[0042]

[0043] (No...

Embodiment 3

[0045] The lead ion imprinted membrane after the cleaning of embodiment 3 is to Pb in the anaerobic digestion liquid 2+ Pilot test analysis of imprinting effect

[0046] The experiment was carried out at 298K, and the lead ion imprinted membrane after chemical cleaning was used as the diaphragm between the two pools. The left pool was taken from pretreated biogas slurry from different farms, and the right pool was 0.01mol· L -1 lead-containing solution, the solution volume in the two pools is 100m 3 , the effective membrane area of ​​the lead ion imprinted membrane is 7m 2 , take the biogas slurry from the left pond every 10 minutes (the volume of liquid taken is 5mL), take a total of 5 times, and measure the heavy metal Pb in the left pond respectively 2+ The data are shown in Table 4. The schematic diagram of the separation operation of lead ion imprinted membrane is as follows: figure 1 shown.

[0047] Table 4 Effect of lead ion imprinted membrane on Pb in anaerobi...

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Abstract

The invention belongs to the field of removing heavy metal lead ions in biogas slurry, and in particular relates to a method for separating and enriching Pb2+ in biogas slurry by using a lead ion imprinted membrane. It specifically includes the following steps: 1) Preparation of lead ion-imprinted membrane: using dibenzo-18-crown-6 as a porogen and Pb(NO3)2 as a template molecule, an ion-imprinted film with a pore size equivalent to the diameter of lead ions is prepared. Membrane; 2) Pretreatment of biogas slurry: After anaerobic digestion of livestock and poultry pollutants to produce biogas, the residual biogas slurry is filtered through quartz sand and mixed fiber filter membrane to remove suspended solids in the biogas slurry, and the pretreated 3) Removal of lead ions: the pretreated biogas slurry is "sieved" and "dissolved and diffused" by the lead ion imprinted membrane, and the lead ions in the biogas slurry can selectively enter through the imprinted membrane. The permeate is separated from the biogas slurry. The technology provided by the invention is simple, less investment, good effect, easy to be accepted by breeding enterprises, and promotes the development of safe resource utilization of biogas slurry.

Description

technical field [0001] The invention belongs to the field of removal of heavy metals in biogas slurry, in particular to a method for separating and enriching Pb in biogas slurry by using lead ion imprinted membrane 2+ Methods. Background technique [0002] According to the National Statistical Yearbook, in 2012, the total number of pigs raised in the country exceeded 480 million heads, and the annual livestock and poultry farming waste discharge exceeded 600 million tons. The content of heavy metals in livestock and poultry manure is closely related to the content of heavy metals in feed. In the process of large-scale breeding, in order to prevent livestock and poultry diseases, promote livestock growth and improve feed utilization, a large amount of copper, iron, zinc, and manganese are used in feed additives. , selenium, iodine, arsenic and other medium and trace elements. Most of these trace metals are excreted with the excrement of livestock and poultry, resulting in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C02F1/62B01D65/06B01D71/22
Inventor 陈彪肖艳春黄婧魏云华林香信
Owner INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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