STP water yellowish when it moves from aeration tank to clarifier tank - Why does this happen? What is the solution?

Hello all,

We have 20,000 ltrs p/day Sewage Treatment Plant (STP) installed. The output water is odourless however the water color is slightly yellowish, when the water moves from aeration tank to clarifier tank. Can you tell me why is that happening and what is the way to fix it?

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