초록 ▼

A method is disclosed for reducing the amount of a first contaminant and second contaminant in a solution to environmentally safe levels, said solution having a substantially greater amount of the first contaminant than the second contaminant. The method comprises: contacting the solution with an ac

A method is disclosed for reducing the amount of a first contaminant and second contaminant in a solution to environmentally safe levels, said solution having a substantially greater amount of the first contaminant than the second contaminant. The method comprises: contacting the solution with an activated or calcined product of a compound having the formula A6B2(OH)16C.4H2O, wherein A is a divalent metal cation, B is a trivalent metal cation and C is a mono- to tetravalent anion. The method further comprises separating the solution from the contacted product. The method is particularly useful for removing both selenium and sulfate, arsenic and sulfate, or arsenic and phosphate from a waste water stream. An unpredicted preference for selenium and arsenic, in the presence of other contaminants including sulfate and phosphate, was also shown herein.

대표청구항 ▼

A method for reducing the amount of first contaminant and second contaminant in a solution, said first contaminant selected from phosphate, sulfate and mixtures thereof, said second contaminant selected from arsenic, selenium and mixtures thereof, said solution having a greater amount of the first c

A method for reducing the amount of first contaminant and second contaminant in a solution, said first contaminant selected from phosphate, sulfate and mixtures thereof, said second contaminant selected from arsenic, selenium and mixtures thereof, said solution having a greater amount of the first contaminant than the second contaminant and said method selectively reducing the level of second contaminant in solution to below about 0.01 ppm, said method comprising: (a) contacting the solution with an activated or calcined product of a compound having the formula AwBw(OH)yCz.nH2O, wherein A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to tetravalent anion, and w, x, y, z, and n satisfy the following: 0≤z≤x≤4≤w≤½y and 3/2w≤n≤12, said product adsorbing first contaminant and selectively adsorbing second contaminant from the solution; and (b) separating the solution and the contacted product.