What is the maximum percentage of change allowed when adjusting the wasting rate?

The maximum percentage of change allowed when adjusting the wasting rate is commonly set at 10%. This figure is established to ensure that adjustments are made in a controlled manner, minimizing shock to the biological treatment processes within wastewater treatment systems. A sudden or excessive change could disrupt the microbial population and overall treatment efficiency, leading to potential violations of discharge permits or a decline in effluent quality.

Adjusting within a 10% range allows operators to monitor the effects of the change closely and make additional adjustments if necessary. It strikes a balance between flexibility in operations and stability in treatment performance, ensuring that the system remains effective while allowing for needed adjustments based on variations in influent characteristics or operational goals.