make a tank which capcity of ...

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make a tank which capcity of tank you need fill the water which contain so2 and bottow surface of tank fixs the air inventor(air diffuser).

And if your is water is black treat the water by cogulatants and remove s04 by below decribe procedure

1.cogulants- lime alum and poly electrolyte.

lime is use to increase the pH which helps to settle the suspend particle

alum is as some but it helps to reduces pH and remove color from water

and poly for quick settling .

 

and if you need in cheap 

just to remove so2 you may bulit a tank and in botttom surface fix the air diffuser.