Figure 4. The

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Figure 4. The cascadeof nitrogen through
the Environment and the associated environmental
impacts. The red dots Indicate denitrification
potential.
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Internal recirculation
Effluent
Influent
Anaerobic
Anoxic
Aerobictank
Secondary
tank
tank
clarifier
Waste sludge
Return sludge
Alum
Mixing
Secondary
Grey water
UF
Effluent
tank
clarifier
Gravel
Waste sludge
Injection
H
SO
CH
CO
H
2
4
4
2
2
B
rown
water
Stripping
Absorbing
Sieve
Digester
tower
tower
Yellow water
(NH
)
SO
RO
Fertilizer
UF
4
2
4
Effluent
Grey water
Secondary
Aerobic
Effluent
clarifier
tank
B
rown
water
Return sludge
Waste sludge
MgO
NaOH
H
SO
2
4
Struvite
Stripping
Absorbing
Yellow water
Hydrolyser
reactor
tower
tower
Mg(NH
)PO
4
4
(NH
)
SO
4
2
4
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