Venturi Injection for Pulp and Paper Mills, 2018 PEERS
Venturi aeration systems are being installed at pulp and paper mills for a variety of reasons. One common application is to combat anaerobic conditions in a mill’s process water system. By aerating/mixing whitewater chests and other storage tanks inside a mill, problematic anaerobic byproducts can be avoided—specifically, Volatile Fatty Acids (VFA) which can be retained in the final product and surface later as a rotten odor. Other byproducts, such as hydrogen sulfide and hydrogen gas, can present a grave explosion risk if they are allowed to accumulate in a system. After installing a venturi aeration system at one mill, VFA compounds were reduced from 1,600mg/l (Acetic), 600mg/l (Propionic), and 400mg/l (Butyric) down to 590mg/l, 30mg/l, and 15mg/l respectively.
At mills, venturis are also being utilized in wastewater treatment processes in a variety of capacities ranging from in-basin aeration for BOD reduction to in-line post treatment oxygenation, and in some cases, concentrated oxygen injection. Regardless of the application, venturis provide a low maintenance solution to help mill personnel produce a higher quality product, ensure a safe working environment, and reduce operational costs associated with wastewater treatment.
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