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Application of polyglutamic acid or its salt in processing heavy metal in water

A polyglutamate, polyglutamic acid technology, applied in water/sewage treatment, water/sludge/sewage treatment, ion-exchanged water/sewage treatment, etc., can solve the problem of high treatment cost and incapable of large-scale applications , the limited processing capacity of ion exchange resin, etc., to achieve the effect of simple use, less dosage, and safe discharge

Active Publication Date: 2010-12-22
臼井义雄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional ion exchange resins have been widely used to recover heavy metals or to remove heavy metals from high-quality water. However, due to the limited processing capacity and high processing costs of ion exchange resins, the removal of heavy metals in ordinary water systems cannot be promoted. Be applicable
Polymer microporous filtration membranes also have similar defects, and cannot be applied on a large scale

Method used

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  • Application of polyglutamic acid or its salt in processing heavy metal in water
  • Application of polyglutamic acid or its salt in processing heavy metal in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]In Example 1, the water in the landscape pool was used as the experimental water body. After testing, the pH value of the water body was 7.8. Under this pH value condition, a commercially available gamma-polyglutamic acid coagulant with the brand name "PG a21" was added Coagulation treatment is carried out, and the technical indicators of the treated water body are as follows:

[0027] pH value 6.9, chromaticity100 degrees, total nitrogen 0.14mg / L, total phosphorus2+ 2.69mg / L.

[0028] It can be seen that the heavy metal ion Cd in the treated water 2+ The concentration is still very high, unable to meet the GB8978-1996 "Integrated Wastewater Discharge Standard".

[0029] The commercially available gamma-polyglutamic acid coagulant with the brand name "PG a21" was used to remove heavy metals from the water body. First, take part of the water body and put it into NaOH or NaOH aqueous solution. Under the two pH values, put in different concentrations of the γ-polyglutamic...

Embodiment 2

[0033] Example 2 The experimental method of this example is the same as in Example 1, except that the coagulant used is a biochemical polymer of gamma-polyglutamate prepared by a biological method, and the gamma-polyglutamate is Na + Forms of γ-polyglutamate and K + A mixture of forms of gamma-polyglutamate. After testing, the gamma-polyglutamic acid salt can obtain the same heavy metal removal effect as in Example 1, Cd 2+ All ≤0.03mg / L, which is far below the discharge concentration of the national standard, and the treated water is acidic and adjusted to neutral conditions, and the plants and fish in the water have no abnormalities.

Embodiment 3

[0034] Embodiment 3 uses the water body discharged into the adjustment pool in the industrial area as the experimental water body. The water body is disinfected and purified by hypochlorite, and then reduced by sulfite. At this time, the pH value of the water body is 8.4, and the water body in the water body Cu 2+ 、Ni 2+ , Fe 2+ 、Cr 3+ The detection concentration is shown in Table 3 before the treatment concentration. Add commercially available γ-polyglutamic acid to the water body in two cases. The first case is to directly inject commercially available γ-polyglutamic acid with a concentration of 200ppm. The second case is to use KOH or NaOH to adjust the water body first. The pH value was between 11 and 12, and then the commercially available γ-polyglutamic acid with a concentration of 200ppm was added. The concentration detection results of the above four ions in the water body are shown in Table 3.

[0035] Table 3 Concentration comparison table of metal ions in water...

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Abstract

The invention provides the application of the heavy metal in poly-glutamic acid or salt treating water, which is characterized in that the application includes removing the heavy metal ions in water or water system by poly-glutamic acid or salt or agglutination agent taking poly-glutamic acid as the material in the alkalescence condition. The invention, which expands the application range of poly-glutamic acid and salt as well as agglutination agent containing poly-glutamic acid or salt, effective removes the heavy metal in water or water system by changing the acid-alkali condition of water and water system, and realizes safe discharge of treated water; besides, with simple structure and few poly-glutamic acid and salt, the invention can remove the heavy metal in large-volume water system, and is applicable to remove various heavy metals in industrial water, landscape water and domestic water system.

Description

technical field [0001] The invention relates to the application of polyglutamic acid or its salts in water treatment, in particular to the application of using polyglutamic acid or its salts to treat water or water systems containing heavy metal ions to remove heavy metal ions. Background technique [0002] γ-polyglutamic acid (Poly glutamic acid, γ-PGA) and its Na + 、K + , Mg 2+ , Ca 2+ and NH 4 + The salts in various forms are all degradable biopolymers and can be obtained by microbial polymerization. This type of polymer has high safety and biodegradability, and can be safely used in various industrial fields. With the large-scale production of gamma-polyglutamic acid and its salts, it has been widely used as a water purifier. It can be used in various sewage and water systems to effectively coagulate the dirt in the water system. It can be applied not only to fresh water, but also to sea water. [0003] γ-polyglutamic acid and its salts, compared with the current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/62C02F101/20
Inventor 臼井义雄
Owner 臼井义雄
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