Wastewater Engineering and Academic Integrity Concepts

Flashcards covering key terms and definitions from the wastewater treatment and academic integrity exam questions.

Volatile Suspended Solids (VSS)

The organic fraction of total suspended solids that combusts and volatilizes upon ignition at $550\,^\circ\text{C}$, calculated by subtracting the residue mass remaining after ignition at $550\,^\circ\text{C}$ from the residue mass after drying at $105\,^\circ\text{C}$.

Fixed Suspended Solids (FSS)

The inorganic or mineral portion of suspended solids that remains as residue on a filter paper after ignition at $550\,^\circ\text{C}$.

CBOD

Carbonaceous Biochemical Oxygen Demand; the amount of dissolved oxygen consumed by microorganisms to oxidize carbonaceous organic matter, such as in the stoichiometric oxidation of acetic acid ($\text{CH}_3\text{COOH} + 2\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$).

NBOD

Nitrogenous Biochemical Oxygen Demand; the amount of dissolved oxygen required by microorganisms to biologically oxidize nitrogenous matter (such as ammonia) into nitrite and nitrate.

Hydraulic Detention Time

The average length of time a volume of water or wastewater resides within a reactor or settling tank, calculated as total tank volume divided by volumetric flowrate.

Horizontal Velocity

The mean horizontal speed of fluid flowing through a settling tank, equal to the volumetric flowrate divided by the cross-sectional area perpendicular to the flow.

Deoxygenation Rate Constant

A parameter quantifying the rate at which dissolved oxygen is depleted in a receiving water body due to microbial decomposition of organic matter.

Reaeration Rate Constant

A parameter quantifying the rate at which oxygen from the atmosphere is transferred into a water body to replenish dissolved oxygen toward saturation.

Lakehead University Academic Integrity Code

The policy requiring students to act ethically in academic matters, complete examinations without unauthorized assistance or materials, respect copyright protections on exam contents, and refrain from providing false or misleading information.