Stage 1-screening
---------------
Here, the water will enter the system and is screened in order to remove any _____ _____ e.g. twigs?
large solids
4 of 25
Here there will also be a ______ _____ which will remove any ____ from the water?
grit channel
grit
5 of 25
Stage 2-sedimentation
--------------------------
Here there will be a settlement _____ and the _____ will settle into the tank separating it from the _____?
tank
solid
liquid
6 of 25
What are the key terms for solid and liquid?
sludge
effluent
7 of 25
Stage 3-aerobic digestion
-------------------
Here, what will be undergoing this?
the effluent
8 of 25
The effluent will be put into a?
biofilter
9 of 25
Containing small _____ to allow _____ to enter?
pores
oxygen
10 of 25
This will allow ______ _____ digestion to occur?
aerobic biological
11 of 25
Then the water can flow out?
into a river
12 of 25
An optional stage for the effluent is what?
sterilisation
13 of 25
Here the water can be sterilised by what three things?
chlorine
ozone
uv light
14 of 25
This will make?
potable water
15 of 25
The sludge from the ________ _____ ?
settlement tank
16 of 25
Will then undergo?
anaerobic biological digestion
17 of 25
This releases what gas?
methane
18 of 25
And produces _______ sludge?
digested
19 of 25
USES OF SLUDGE
-----------------------
What are four ways?
fertilisers
biogas
methane
electricity
20 of 25
How can sludge be used as a fertiliser?
help improve fertility of soil
21 of 25
Biogas is a mixture of ______ _______ and hydrogen _____?
methane
CO2
Hydrogen sulphide
22 of 25
It is used as a ?
fuel
23 of 25
Methane is also?
used as a fuel
24 of 25
Electricity since if the sludge is _____ it can be _____ to generate electricity?
dried
incinerated
25 of 25
Other cards in this set
Card 2
Front
Sewage and agricultural waste water require removal
of _______ matter and harmful _______
Back
organic
microbes
Card 3
Front
What are the 5 main stages of waste water treatment?
Back
Card 4
Front
Stage 1-screening
---------------
Here, the water will enter the system and is screened in order to remove any _____ _____ e.g. twigs?
Back
Card 5
Front
Here there will also be a ______ _____ which will remove any ____ from the water?
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