Water Purification Question Preview (ID: 49639)
What And How Is Water Purified By Nature And By Man.
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What happens to the waste after the digester?
a) organic matter settles to the bottom and is removed
b) bacteria using oxygen break organic matter into carbon dioxide and water
c) bacteria, without oxygen, break down organic matter releasing methane
d) organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
What happens in settling tanks?
a) organic matter settles to the bottom and is removed
b) bacteria using oxygen break organic matter into carbon dioxide and water
c) bacteria, without oxygen, break down organic matter releasing methane
d) organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
What happens in the digester tanks?
a) organic matter settles to the bottom and is removed
b) bacteria using oxygen break organic matter into carbon dioxide and water
c) bacteria, without oxygen, break down organic matter releasing methane
d) organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
What happens in the clarifier tanks?
a) organic matter settles to the bottom and is removed
b) bacteria using oxygen break organic matter into carbon dioxide and water
c) bacteria, without oxygen, break down organic matter releasing methane
d) organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
Which agent for purifying water, does not kill bacteria but makes them unable to reproduce?
a) chlorine
b) ozone
c) UV radiation
d) all of these
What can be used to kill disease-causing bacteria in treated wastewater?
a) chlorine
b) ozone
c) UV radiation
d) all of these
What is the first step in cleaning wastewater?
a) grit tank
b) bar screens
c) clarifier tanks
d) digesters
What step in the treatment of wastewater produces methane gas that can be used for electricity and heat?
a) bar screens
b) settling tanks
c) digesters
d) clarifier tanks
What process removes virtually all dissolved materials from water?
a) sedimentation
b) infiltration
c) bacterial and plant action
d) evaporation
What process easily removes large particles from water as the movement of water slows?
a) sedimentation
b) infiltration
c) bacterial and plant action
d) evaporation
What breaks down organic matter into carbon dioxide and water
a) sedimentation
b) bacterial and plant action
c) infiltration
d) evaporation
What is the removal of particles by passing water through materials with smaller and smaller holes?
a) sedimentation
b) filtering
c) bacterial and plant action
d) evaporation
What is the dropping of particles from water due to slowing of water movement?
a) sedimentation
b) filtering
c) evaporation
d) bacterial and plant action
What naturally removes most of the smaller particles from water?
a) sedimentation
b) bacterial and plant action
c) infiltration
d) evaporation
How do plants help clean water?
a) they help the water to slow and allow for sedimentation
b) they remove contaminants from the water
c) they perform transpiration that releases clean water vapor
d) all of the above
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