Some questions regarding chemical phosphorus removal; seeking advice
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The issue of phosphorus removal from domestic wastewater: If the A/O + coagulation-sedimentation process (PAC/PAM) meets the required standards, there is a risk that the phosphorus levels will not meet the specifications. What are the appropriate chemicals to be used for phosphorus removal after the treatment, and what methods can be employed to remove the resulting sediment? MBR membrane process. Chemicals for chemical phosphorus removal and methods for removing precipitates. Could everyone please advise me? Our colleagues are using not only PAC/PAM but also ferric chloride for phosphorus removal. I’m not sure how they plan to achieve color removal and the elimination of precipitates.
Isn’t PAC/PAM sufficient? After flocculation, the mixture can be settled and separated; there’s a concern that the concentration of suspended solids might not meet the standards, so a sand filter can be used after sedimentation
The chemical method involves adding lime or calcium chloride, followed by the use of coagulants and flocculants to see what works
This post was last edited by Bagua Lu on 2015-10-14 09:07. There are many methods available, such as using iron salts, aluminum salts, calcium salts, magnesium salts, and so on; however, it is essential to develop a suitable plan based on the specific circumstances, in order to achieve good results at a low cost.
The A/O process has limited effectiveness in phosphorus removal; the removal rate generally varies depending on the organic matter concentration in the influent water. The A2/O process, on the other hand, exhibits a better ability to remove phosphorus.
The conventional treatment process for domestic wastewater is A2/O, which takes into account both nitrogen and phosphorus removal.
If the aerobic tank is large, it can be converted to an A2/O process, which will meet the discharge requirements.
The common post-treatment phosphorus removal process is coagulation sedimentation; however, it requires a large amount of chemicals, and different chemicals have specific pH requirements, with the removal efficiency varying significantly under different pH conditions.