Slimy effluent present in the ETP aeration tank

Slimy effluent present in the ETP aeration tank

Hi,

We are a pharmaceutical based company. We have an ETP which is designed for 30 KLD. In the aeration tank, we have observed slimy nature of the effluent when the sample is drawn. If we stir the effluent from the aeration tank in a 1 L beaker, we observe that the contents are slightly thick. The effluent in the aeration tank is light brown in color. We have never observed this in the past. Would like to know what can cause this.

Thanks

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