Method of precipitating protein at the time of removal of heavy

Details Method of precipitating protein at the time of removal of heavy Method of precipitating protein at the time of removal of heavy

1997-08-01

1999-09-28

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210710, 210727, 210738, 210905, 210912, 210913, 530421, 530857, 530859, C02F 156

Patent

active

059582480

ABSTRACT:
A method and a system which enable simple and inexpensive removal of heavy metals from a heavy-metal-containing substance. In this method, a substance containing heavy metals and water are introduced into a mixing bath in proportions by weight of 1:3 to 1:6. A strong acid is added to the mixture, and the mixture is stirred while its pH is maintained at a pH lower than 4. As a result of stirring of the substance at a pH 4, heavy metals are extracted into the liquid as metal ions. The metal-ion-containing liquid is input to a heavy metal precipitation bath, and the pH of the liquid is increased to a pH higher than 10 by addition of alkali to the liquid. Gas bubbles of carbonic acid gas are input to the liquid from a lower portion of the heavy metal precipitation bath, and they are broken into a large quantity of small gas bubbles of carbonic acid gas by turbine blades. The large quantity of gas bubbles of carbonic acid are brought into contact with the metal-ion-containing liquid having a pH higher than 10. As a result, metal ions are precipitated in the heavy metal precipitation bath as carbonates. If the substance is fish or shellfish, alkali and polymer are added to the heavy-metal-removed liquid in the heavy metal precipitation bath, and the liquid is stirred, whereby protein is precipitated.

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