Method of purification of polluted underground water

Details Method of purification of polluted underground water Method of purification of polluted underground water

1997-02-13

1998-04-14

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210614, 210747, C02F 334

Patent

active

057387893

ABSTRACT:
A method of purifying underground water in a pollution zone comprises determining the rock components of the pollution zone and the flow velocity of the underground water; taking samples of the underground water from a plurality of wells without admitting air and determining their sulfate ion (SO.sub.4.sup.2.sbsp.-) concentration and pH value to reveal the acidity/alkalinity of the environment, a pH less then 4 or greater than 11 being changed to one in a range of values from about 4 to about 11. Then, sulfate-reducing bacteria are selected and a biomass of them is accumulated. The resulting biomass is introduced into the underground water through those wells whose water samples have a pH value lying within the range of values from about 4 to about 11. And then, the biomass is introduced into the underground water through the remaining wells. The biomass input depends on the sulfate ion concentration, the higher the sulfate ion (SO.sub.4.sup.2.sbsp.-) concentration, the higher the input of the indicated biomass, and the frequency at which the biomass is introduced depends on the flow velocity of the underground water, the higher the flow velocity of the underground water, the more frequently the above-mentioned biomass is introduced. As a result of introducing the biomass, the sulfate ion concentration falls to a value which is correspondingly up to/below its maximum permissible concentration.

REFERENCES:
patent: 5006250 (1991-04-01), Roberts et al.
patent: 5302287 (1994-04-01), Losack
patent: 5384048 (1995-01-01), Hazen et al.
patent: 5393426 (1995-02-01), Raskin et al.
patent: 5449460 (1995-09-01), Buisman

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