At which point, chemical addition for phosphorous removal can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be carried out?#

Prior to primary sedimentation tank

At which point, chemical addition for phosphorous removal can‚Äö�

1.	At which point, chemical addition for phosphorous removal can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be carried out?#
A.	Preliminary treatment
B.	Prior to primary sedimentation tank
C.	Prior to secondary treatment
D.	After secondary treatment
Answer» B. Prior to primary sedimentation tank