12.9.- ( VD.07 ) → River systems.

Watsan matters
12.9.- ( VD.06 ) → Run-off generation - ( 2 ).
12.9.- ( VD.05 ) → Run-off generation - ( 1 ).
12.9.- ( VD.04 ) → Precipitation.
12.9.- ( VD.03 ) → Evaporation.
12.9.- ( VD.02 ) → Water cycle.
12.9.- ( VD.01 ) → Teaser.
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12.8.- ( VD.32 ) → Sludge treatment - sewage digestion - anaerobic treatment.
12.8.- ( VD.31 ) → Sludge treatment - dewatering.
12.8.- ( VD.30 ) → Sludge treatment - digestion.
12.8.- ( VD.29 ) → Sludge treatment - thickening.
12.8.- ( VD.28 ) → Resource factory.
12.8.- ( VD.27 ) → Biological phosphorus removal.
12.8.- ( VD.26 ) → Chemical phosphorus removal.
12.8.- ( VD.25 ) → Nitrogen removal.
12.8.- ( VD.24 ) → The phosphorus problem.
12.8.- ( VD.23 ) → Aeration.
12.8.- ( VD.22 ) → Bulking sludge.
12.8.- ( VD.21 ) → Dimensioning of secondary clarifier.
12.8.- ( VD.20 ) → Dimensioning of return sludge.
12.8.- ( VD.19 ) → Aeration tank loading and dimensioning.
12.8.- ( VD.18 ) → Feedback module.
12.8.- ( VD.17 ) → Trickling filters.
12.8.- ( VD.16 ) → Nitrogen cycle.
12.8.- ( VD.15 ) → Carbon cycle.
12.8.- ( VD.14 ) → Oxidation fundamentals and kinetics.
12.8.- ( VD.13 ) → Carbon cycle and You.
12.8.- ( VD.12 ) → Feedback module.
12.8.- ( VD.11 ) → Primary sedimentation.