Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1980-11-03
1982-02-09
Novosad, Stephen J.
Hydraulic and earth engineering
Earth treatment or control
Chemical
166266, 166271, 299 4, E21B 4327, E21B 4328
Patent
active
043147798
ABSTRACT:
A method is disclosed for restoring a clay rich aquifer which has been solution mined with ammonium ions. Calcium carbonate is precipitated from a solution pumped through the aquifer by the addition of calcium oxide, calcium hydroxide, or a mixture thereof in quantities sufficient to raise the pH to at least about 9.5. The precipitated calcium carbonate is separated from the solution and the ammonium ion is then removed from the solution by standard techniques. The solution is recycled through the aquifer and these steps are repeated until the bicarbonate ion concentration has been reduced to such an extent that the addition of at least one soluble salt of calcium, magnesium, or potassium to the solution does not result in precipitation of calcite underground, plugging the aquifer. Recycling with the addition of the soluble salt is continued until the ammonium ion concentration is reduced to a desired level. Finally, residual amounts of the salt are removed from the aquifer using standard techniques.
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patent: 2818240 (1957-12-01), Livingston
patent: 3278232 (1966-10-01), Fitch et al.
patent: 4079783 (1978-03-01), Snavely et al.
patent: 4114693 (1978-09-01), Foster et al.
patent: 4134618 (1979-01-01), Kossack
patent: 4155982 (1979-05-01), Hunkin et al.
Sundar Parameschwaran S.
Tiepel Erich W.
Fuerle R. D.
Novosad Stephen J.
Wyoming Mineral Corp.
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