What happens to the sludge produced during the first two phases of sewage processing? (Select all that apply)
A) It is used as agricultural fertilizer since it contains high levels of NPK and organic material
B) It is converted into biofuels because of its high CO2 levels
C) It can be converted into biogases such as methane
D) It can be heat-treated and used to make construction materials
Correct Answer:
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