Wastewater Microorganisms: Where, When and Why, 2017PEERS

Microorganisms are a key factor in treating wastewater that is generated during the pulping/papermaking process. Microorganisms play an important role in the bioremediation of wastewater, but it is essential that mill wastewater plant operators understand how this biological system functions, as well as when and where microorganisms function within the system to ensure proper treatment of the mill’s effluent. A basic understanding of what types of microorganisms exist, what roles they play, and how to affect their processes in their ecosystem will greatly improve the effectiveness and sustainability of a healthy treatment system.

The consequences of neglecting the state of the microorganisms can be significant. Signs of oncoming problems include sludge bulking, foaming, poor settleability, inefficient removal of suspended solids, excess sludge, and inefficient removal of BOD or COD. For example, many foaming and sludge‐bulking issues are due to excessive filamentous bacteria that thrive in systems that are out of balance. It is important to understand how, when, and where the systems’ microbes are relied on to purify the contaminants in the wastewater to ensure stable and efficient wastewater treatment processes. 

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