Treated Effluent Disposal Methods Quiz

What is one of the challenges associated with the natural evaporation method of effluent disposal?

Minimal storage requirements
Low risk of groundwater pollution
The need for large impoundments (correct)
Reduced evaporation rates

What is a concern when considering groundwater recharge as an effluent disposal method?

Decreased percolation rates
High recovery rates
Low treatment costs
Potential for groundwater pollution (correct)

Which crops are typically irrigated with wastewater effluent according to the text?

Field crops like cotton and sugar beets (correct)
Wheat and maize
High-value cash crops
Crops consumed by humans

What is a disadvantage of the direct injection method for effluent disposal?

High costs associated with effluent treatment (A) Signup and view all the answers

Why is irrigation with effluent commonly practiced in arid areas?

Due to the scarcity of natural water resources (A) Signup and view all the answers

In the context of effluent disposal, what does 'rapid infiltration' refer to?

Fast percolation of effluent into the ground (B) Signup and view all the answers

What are some factors that affect pond design?

Solar radiation and algal growth patterns (B) Signup and view all the answers

How does the depth of the aerobic layer in a facultative pond change with increased organic loading?

Decreases due to insufficient oxygen production (C) Signup and view all the answers

What is the consequence of an imbalance between methane bacteria and acid formers in gasification of organic matter?

Decrease in methane production (B) Signup and view all the answers

How does temperature affect the activity of methane bacteria compared to acid formers?

Methane bacteria are more affected by temperature changes (A) Signup and view all the answers

What is the relationship between algal growth and oxygen production?

Oxygen production occurs concurrently with algal growth (B) Signup and view all the answers

What affects the permissible areal organic loading for a pond?

Incidence of sunlight and percentage of influent BOD that needs aerobic satisfaction (A) Signup and view all the answers

How is the efficiency of treatment in a pond described when BOD exertion follows a first order reaction?

By plug flow efficiency equation Le/Li = e-k1t (A) Signup and view all the answers

What is recommended for achieving a conservative pond design?

Assuming complete mixing or selecting larger dispersion number values (C) Signup and view all the answers

In terms of depth, what is considered the optimum range for facultative ponds?

1.0 - 1.5 m (D) Signup and view all the answers

What is the purpose of using lagoons in aquaculture?

To cultivate aquatic organisms for various purposes (D) Signup and view all the answers

What is a key concern associated with the uncontrolled spread of water hyacinths in aquaculture?

Preventing the clogging of waterways and water bodies (A) Signup and view all the answers

In industrial effluent reuse decisions, what is NOT a deciding factor mentioned in the text?

Presence of marine life in the receiving waters (B) Signup and view all the answers

What is the primary function of stabilization ponds in wastewater treatment?

To provide long detention periods for treatment (A) Signup and view all the answers

What distinguishes anaerobic stabilization ponds from aerobic ones in wastewater treatment?

Anaerobic ponds have a shallow depth with BOD loading (A) Signup and view all the answers

What is the primary mechanism of sewage purification in a facultative stabilization pond?

Oxidation of organic matter by algal photosynthesis (B) Signup and view all the answers

Why is it important for aerobic stabilization ponds to maximize light penetration throughout the liquid depth?

To facilitate intense algal growth (A) Signup and view all the answers