Treatment of phosphorus-containing wastewater
Thread Content
After treatment with lime and flocculants, the phosphorus content in the wastewater still remains at 50 ppm, which is far from meeting the standards. What treatment methods can be used to bring it up to standard?
PH is increased with lime to make the alkalinity above 11, followed by filtration; the portion of TP that cannot be removed is likely organic phosphorus, which cannot be eliminated using simple precipitation methods.
The phosphorus in phosphating wastewater is likely to be in the form of orthophosphorus. Wouldn’t it be more effective to treat it in separate tanks? First, add lime to adjust the pH to 9-11 in order to remove phosphorus, and then use PAC/PAM for coagulation to eliminate any remaining phosphorus.
I agree with you; reaction time must be ensured, otherwise incomplete reactions will also affect the removal efficiency.
Looking at what you said below, you’re not using the intermittent method, are you? Then isn’t precipitation separation done at all? Also, does your phosphating wastewater contain any metaphosphoric acid or similar substances? Some phosphorus-containing wastewaters fail to form calcium phosphate precipitates
It would be best to filter again after coagulation, because at low concentrations the solid crystals formed are small and cannot be separated by simple sedimentation; filtering should yield good results
We have encountered the same problem: high-concentration phosphorus-containing wastewater cannot be brought to the required standards through lime neutralization treatment; secondary treatment is necessary, which is costly, and the results do not meet environmental regulations. I wonder if there are any better solutions
In Sichuan, you can get in touch with me and we’ll help you handle it;P
It’s not in Sichuan, it’s in Anhui – could you give us some suggestions or work with us?
There is a way, but it involves technical secrets so it’s not convenient to discuss
This post was last edited by Gorou’s Eight Trigrams Staff on 2015-12-11 08:16. Can we work together? Is it easy to get in touch?