When using ammonium bicarbonate to precipitate cobalt, the cobalt is not precipitated completely; currently the concentration is 100 ug/l. How can it be reduced to below 10 ug/l?
Thread Content
This post was last edited by xwtsq on 2011-7-3 07:09. Cobalt does not get precipitated completely during the use of ammonium bicarbonate for its removal; the current concentration is 100 μg/L. How can it drop to below 10 μg/L by the end?
Our company also uses a similar process to treat wastewater; you can try adding alkali to adjust the pH – it should work/
To completely precipitate cobalt, heat retention and aging are necessary; by controlling the heat retention time and temperature, as well as the pH at the end of the process, this issue can be resolved.
It is difficult to reduce the cobalt content to below 10 ug/g solely through reaction-based precipitation. For hydrogen-ammonia precipitation of cobalt, the pH is generally maintained at 7–8; a higher pH results in less free cobalt, but this still does not achieve the target level of below 10 ug/g. Additional wastewater treatment is necessary, and it is recommended to use S2- for further cobalt precipitation, which can help achieve a level of below 1 ug/g! After using S2 for cobalt precipitation, simply carry out flocculation and filtration with PAM!