30 Questions
What is the main cause of eutrophication as mentioned in the text?
Nitrogen and phosphorus
Why does eutrophication occur faster when nutrients are contributed by anthropogenic sources?
Accelerates the eutrophication cycle
How does fertilization impact water quality according to the text?
Raises bacteria concentration to hazardous levels
What does the term 'eutrophic' mean based on its etymology as described in the text?
'Well fed or nutrient rich'
How can eutrophication be controlled, according to the text?
Encourage effective disposal of sludge
What contributes to polluting water by mixing toxic substances with the water supply?
Cultivating land
What is the term used to describe the attached biomass responsible for metabolizing organic matter in sewage?
Biological film
What happens to microorganisms in the lower portion of the slime layer when the microbial population increases significantly?
Slough off from the media surface
Which component of an activated sludge treatment process accelerates the removal of biological oxygen demand (BOD)?
Sludge recirculation system
What is the main function of the aerobic bacteria present in the biological film in a sewage treatment system?
Oxidize organic matter in sewage
What characterizes the endogenous phase of growth for microorganisms in a sewage treatment system?
Detachment from media surface
In an activated sludge treatment process, what is the purpose of the secondary sedimentation tank?
Recycle biological floc to aeration tank
What is turbidity in water samples caused by?
Sand, silt, mud, chemical precipitates, germs, and bacteria
What does alkalinity in water help determine?
Amount of acid that can be neutralized
Why is dissolved oxygen important in lakes and rivers?
For supporting aquatic life
What damage can turbidity cause to water pipes and valves?
Blockage and impairment
Which ions are primarily responsible for alkalinity in water?
OH-, HCO3 -, CO3 -2
How is turbidity in water samples determined?
Using a turbidity meter
What is the principal purpose of sludge digestion in wastewater treatment?
Removing pathogens
Which substances are employed as disinfectants for removing pathogens in sewage treatment?
Bleaching powder
What gases are produced during the sludge digestion process?
Hydrogen sulphide and ammonia
What type of tank is a septic tank useful for in wastewater treatment?
Sedimentation and digestion
Which process leads to the death of microbes when disinfectants are used in sewage treatment?
Deactivating metabolic activities
What is the main goal of using chlorine in sewage treatment?
Deactivating microbial metabolic activities
What is the purpose of the gas vent in an Imhoff tank?
To prevent gases from escaping during the sewage treatment process
What distinguishes an Oxidation Ditch from other treatment methods mentioned?
It involves introducing raw sewage directly into aeration units
In an Imhoff tank, what happens in the sedimentation chamber?
Solids from the sewage settle down
What is the primary role of the rotor in an Oxidation Ditch?
Agitation and oxygenation of the sewage
How do Oxidation Ponds primarily stabilize organic matter?
Through the symbiotic relationship between bacteria and algae
What distinguishes an Imhoff Tank from a Septic Tank?
It has two chambers - a sedimentation and a digestion chamber
Test your knowledge on the pollution of water bodies due to nitrogen, toxic chemicals from fertilizers and pesticides, as well as the phenomenon of eutrophication. Learn about the harmful effects of water pollution and how excess nutrients can lead to the imbalance in aquatic ecosystems.
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