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If a wastewater treatment plant (WWTP) is NOT functioning properly, why might the oxygen levels in downstream water bodies decrease?

How does increasing the concentration of a disinfectant affect the CT value?

Fill the blanks about the types of organic carbon.

What is the typical unit used to express cell yield in wastewater treatment?

Substrate utilization rate curve is provided as below. The substrate utilization rate is approaching to its maximum, 1000 g/d/m3 as substrate concentration increases. Using the information provided, determine Ks in mg bsCOD/L. X = 100 mg VSS/L k = 10 mg bsCOD/mg VSS/d    

Which type of solid represent the cells in secondary treatment process the best? 

What is NOT the primary characteristic of the lag phase in the bacterial growth curve?

I hope you still remember this slide about the VSS production rate. Why is the item marked in red (see the illustration) excluded from VSS production?

Based on the breakpoint chlorination, determine sodium hypochlorite (purity is 7%) dosage rate (kg/day) to apply free chlorine residual of 1.0 mg/L to disinfection of 150,000 m3/day of drinking water.

Which is NOT the primary target in secondary and tertiary wastewater treatment processes to minimize its environmental impact?