Method for removing heavy metals from and dissolving calcium and/or magnesium scales in water or aqueous system

A method for removing a heavy metal from and/or dissolving calcium and/or magnesium scales in water or an aqueous system comprising using γ-polyglutamate hydrogel as a chelating agent for removing a heavy metal and/or as a dissolving agent for removing calcium and/or magnesium scales from water or the aqueous system, wherein said γ-polyglutamate hydrogel is prepared from γ-polyglutamate in Na+form, γ-polyglutamate in K+ form, or γ-polyglutamate in NH4+ form, or a mixture thereof cross-linked with diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, polyoxyethylene sorbitol polyglycidyl ether, polysorbitol polyglycidyl ether, or polyethylene glycol diglycidyl ether, or a mixture thereof, wherein said water or aqueous system has a pH ranging from 6.0 to 8.0.

A method for removing a heavy metal from and/or dissolving calcium and/or magnesium scales in water or an aqueous system comprising using γ-polyglutamic acid (γ-PGA, H form), γ-polyglutamate in Na+ form, γ-polyglutamate in K+ form, or y-polyglutamate in NH4+ form, or a mixture thereof in combination with a γ-polyglutamate hydrogel as a chelating agent for removing a heavy metal and/or as a dissolving agent for removing calcium and/or magnesium scales from water or the aqueous system, wherein said γ-polyglutamate hydrogel is prepared from γ-polyglutamate in Na+ form, γ-polyglutamate in K+ form, or γ-polyglutamate in NH4+ form, or a mixture thereof cross-linked with diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, polyoxyethylene sorbitol polyglycidyl ether, polysorbitol polyglycidyl ether, or polyethylene glycol diglycidyl ether, or a mixture thereof, wherein said water or aqueous system has a pH ranging from 6.0 to 8.0.

A method for removing a heavy metal from and/or dissolving calcium and/or magnesium scales in water or an aqueous system comprising using a γ-polyglutamate hydrogel as a chelating agent for removing a heavy metal and/or as a dissolving agent for removing calcium and/or magnesium scales from water and the aqueous system, wherein said γ-polyglutamate hydrogel is prepared from γ-polyglutamate in Na+ form, γ-polyglutamate in K+ form, or γ-polyglutamate in NH4+ form, or a mixture thereof cross-linked by irradiation with gamma ray or electron beams, wherein said water or aqueous system has a pH ranging from 6.0 to 8.0.

A method for removing a heavy metal from and/or dissolving calcium and/or magnesium scales in water or an aqueous system comprising using γ-polyglutamic acid (γ-PGA, H form), γ-polyglutamate in Na+ form, γ-polyglutamate in K+ form, or γ-polyglutamate in NH4+ form, or a mixture thereof in combination with a γ-polyglutamate hydrogel as a chelating agent for removing a heavy metal and/or as a dissolving agent for removing calcium and/or magnesium scales from water or the aqueous system, wherein said γ-polyglutamate hydrogel is prepared from γ-polyglutamate in Na+ form, γ-polyglutamate in K+ form, or γ-polyglutamate in NH4+ form, or a mixture thereof cross-linked by irradiation with gamma ray or electron beams, wherein said water or aqueous system has a pH ranging from 6.0 to 8.0.