CEE 4502 Exam 1

In communities with separate sewers, the sanitary sewers

may receive infiltration and may receive sanitary and pretreated industrial wastewater.

Water quality-based standards

are specific to the body of water receiving the wastewater
established to ensure the designated or best uses of the water body are met

Total maximum daily loads (TMDLs) are enacted

the designated uses of a water body are not being met or are threatened

A subset of toxic pollutants that are routinely monitored by wastewater treatment plants using specific analytical methods are known as

priority pollutants

What is/are abundant in untreated wastewater?

NH3 & Organic N & Phosphorus

What is/are toxic to aquatic organisms?

NH3

What is exert(s) an oxygen demand

NH3 & Organic N

What can cause eutrophication?

NH3, NO3, phosphorus

What is responsible for oxidizing organic matter and ammonia in wastewater, but some strains are pathogens.

Bacteria

The presence of what may be indicative of a stable biological treatment process because some strains graze on bacteria, but other strains are waterborne pathogens

protozoa

Particles that become coated with surface active agents (SAA) in sewers are problematic because

They have a low settling velocities compared to sand particles of the same size and are not captured in grit chambers
they may settle in biological treatment process tanks when the SAA are degraded

The UBOD is

is equal to the exerted BODt as t→ infinity
is equal to the total amount of O2 needed to oxidize carbonaceous BOD to CO2

You are given the UBOD, ThOD, and COD of a wastewater. To obtain an estimate of the UBODn you should,

subtract the UBOD from the ThOD

To obtain the estimate of the non-biodradable carboniouase material in the wastewater, you should

subtract UBOD from COD