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