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A method and device for removing heavy metal ions in seaweed extract based on electrodialysis technology

A seaweed extract and electrodialysis technology, applied in the field of membrane separation, can solve the problems of slow reproduction speed and reaction rate of functional bacteria, strict requirements on reaction conditions, unfavorable recovery of heavy metal ions, etc., achieving good selectivity, compact and durable equipment, The effect of low energy consumption

Active Publication Date: 2019-10-29
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0003] There are obvious deficiencies in the traditional heavy metal treatment methods: the chemical precipitation method has a large dosage of chemicals, high cost of chemicals, and there is a risk of secondary pollution; the removal of heavy metals by the adsorption method is generally more efficient, but the requirements for the reaction conditions are relatively strict. It is usually difficult to regenerate the agent, and there are problems of solid-liquid separation and disposal of the adsorbent, which is not conducive to the recovery of heavy metal ions; biological treatment of heavy metal ions has the disadvantages of slow reproduction speed and reaction rate of functional bacteria, and difficult reuse of the treated material liquid. And when the concentration of heavy metal ions is very high, the reproduction of microorganisms will be inhibited; in addition, the patent CN107497502 also discloses the use of strongly acidic ion exchange resins to remove heavy metal ions in seaweed, but the regeneration and elution of ion exchange resins require a large amount of chemicals and water

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  • A method and device for removing heavy metal ions in seaweed extract based on electrodialysis technology

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Effect test

Embodiment 1

[0041] The relevant parameters of the electrodialysis membrane stack are: the assembly method of the membrane stack device is vertical assembly, the membrane stack has a total of 15 pairs of membranes, the cation exchange membrane is a sulfonic acid type homogeneous cation exchange membrane, and the anion exchange membrane is a quaternary ammonium type homogeneous Anion exchange membrane, the anode electrode material is titanium coated with ruthenium, the cathode electrode material is stainless steel, and the separator is polypropylene non-loop separator. The seaweed extract solution is sodium alginate solution, in which the heavy metal ion is copper ion, and the copper ion concentration is 4.5 mg / L.

[0042] The solution adopts the above steps 1-4 to remove heavy metal copper ions, wherein the water tank 7 of the desalination chamber and the water tank 16 of the concentration chamber are fed with 2 L, and the circulation flow rate of the desalination chamber, the concentration...

Embodiment 2

[0044] The relevant parameters of the electrodialysis membrane stack are: the assembly method of the membrane stack device is vertical assembly, the membrane stack has a total of 20 pairs of membranes, the cation exchange membrane is a sulfonic acid type homogeneous cation exchange membrane, and the anion exchange membrane is a quaternary ammonium type homogeneous phase Anion exchange membrane, the anode electrode material is titanium coated with ruthenium, the cathode electrode material is stainless steel, and the separator is polypropylene non-loop separator. The seaweed extract solution is sodium alginate solution, in which the heavy metal ion is lead ion, and the lead ion concentration is 4.2 mg / L.

[0045] The solution adopts the above steps 1-4 to remove heavy metal copper ions, wherein the water tank 7 of the desalination chamber and the water tank 16 of the concentration chamber are fed with 2 L, and the circulation flow rate of the desalination chamber, the concentrati...

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Abstract

The invention discloses a method and a device for removing heavy metal ions in seaweed extract based on electrodialysis technology, specifically, the pretreated seaweed extract is transported to a desalination chamber by a raw material liquid storage tank, and then passed through an electrodialysis device The operation makes the heavy metal ions in the seaweed extract directional migrate to the concentration chamber of the electrodialysis device in the membrane stack, thereby realizing the removal of heavy metal ions in the seaweed extract. The whole process is fully automated through the PLC automatic control device. At the same time, it is disclosed Apparatus related to this method. The invention has the advantages of simple process flow, high removal rate, low energy consumption, small occupied area and high degree of automation.

Description

technical field [0001] The invention belongs to the field of membrane separation, and specifically relates to a method for removing heavy metal ions in seaweed extracts based on electrodialysis technology and a device thereof. The removal of heavy metal ions in seaweed extracts is realized through the electrodialysis technology. Background technique [0002] Seaweed extract is a pure natural marine biological product, which contains alginic acid, crude protein, multivitamins, enzymes and trace elements. After such nutrients are absorbed by the skin, it can reduce surface blood lipids and improve surface skin hematopoietic function , but also has the function of losing weight, keeping warm and thickening. Seaweed extract has a wide range of uses. In agricultural applications, it can promote plant growth, improve soil water retention capacity, promote the growth of beneficial microorganisms and strengthen soil health; in medical applications, it has anti-tumor and anti-cancer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F1/42C02F101/20
CPCC02F1/42C02F1/4693C02F2101/20C02F2201/46Y02A20/124
Inventor 马准孙久义孙永超徐冬梅高军许玉婷王小濛冯军军
Owner SHANDONG UNIV OF SCI & TECH