Help with Civil Engineering Chemistry Homework

[niz]

Hi everyone!
First of all let me say how happy i am that there is such a place where i can ask help with homework.
I am studing civil engineering and i am having problems with chemistry :shy:
I got homework to do and i finished all the tasks except this one and i would reallllyyyy be so gratefull for your help
Here is the task:

How much Al2(SO4)3 do you need for the process of sedimentation (to get residuum) of PO4 out of 25000L of waste water ?
Concentration of PO4 is 15mg/L

thanks again so much for your help

 

[Gokul43201]

niz, please read the rules for posting homework questions. You agreed to the rules before entering this sub-forum, but if you weren't paying attention then, click the links in my signature line.