Engineering & Materials Science
Air
7%
Ammonia
7%
Biogas
7%
Cellulose
7%
Drying
6%
Fertilizers
17%
Gases
7%
Membranes
11%
Nitrogen
86%
Phosphorus
16%
Recovery
63%
Sustainable development
11%
Vacuum
5%
Wastewater
100%
Wastewater treatment
39%
Earth & Environmental Sciences
air
7%
ammonia
5%
atmosphere
8%
biogas
7%
cellulose
6%
digester
7%
drying
6%
energy use
7%
fertilizer
12%
fixation
7%
food production
7%
gas
7%
infrastructure
5%
membrane
9%
nitrogen
56%
nitrogen cycle
8%
phosphorus
10%
policy making
7%
resource
52%
sludge
5%
struvite
9%
sustainability
10%
urine
7%
wastewater
62%
wastewater treatment
18%
wastewater treatment plant
13%
Social Sciences
air
21%
demand
9%
energy
18%
food
9%
infrastructure
9%
interaction
6%
interference
12%
maturity
13%
resources
40%
sustainability
19%
uncertainty
10%
Wastewater treatment
96%
water
10%