Water and Wastewater Treatment Mock Exam Preparation

A comprehensive set of question-and-answer flashcards covering the stages of wastewater treatment, the mechanics of filtration and adsorption, and specific research findings regarding Zinc removal.

Which process removes large floating materials from wastewater?

Screening

What materials are specifically removed during the Grit Removal stage?

Sand, silt, and grit

What is the function of the Coagulation process?

It neutralizes particle charges so they can combine.

What is the term for gentle stirring that encourages particle agglomeration?

Flocculation

What occurs during the Sedimentation process?

Suspended particles settle due to gravity.

What is the name for the sediment collected during water treatment?

Sludge

What materials are commonly used to compose water treatment filters?

Sand and gravel

What is the term for the process used to clean filters?

Backwashing

Aerobic digestion occurs in the presence of which substance?

Oxygen

What is the primary purpose of the disinfection step?

To kill pathogenic microorganisms

Which chemical is listed as a common disinfection method?

$$Cl_2$$

What are the three common types of grit chambers?

Aerated, Vortex, and Horizontal

How does the process of adsorption remove contaminants?

By adhering them to a solid surface

Which specific contaminant was studied in the adsorption research?

Zinc ($Zn^{2+}$)

What was the optimal pH identified for $Zn^{2+}$ adsorption?

$$5$$

Which specific biochar performed better in the adsorption research?

SH-SCBB

What was the dominant adsorption mechanism identified in the research?

Chemisorption

What is the average processing time for wastewater treatment?

$1$ to $3$ days

What is the definition of mine tailings?

Residual waste after mineral extraction

Between coagulation and flocculation, which process occurs first?

Coagulation

True or False: Adsorption occurs inside the material rather than on the surface.

FALSE

What happens during the Aeration process?

Water and air are brought into close contact.