Purification of inlet water

Purification of inlet water includes measures that act as buffer systems between highly productive agricultural areas and the water. Such systems using ecological principles are, for example, pre dams, macrophyte belts, and ponds. A phosphorus elimination plant (PEP) at the main inflow of a lake is the costlier technical alternative.

Increasing phosphorus retention

Phosphorus retention can be increased by enhancing P sedimentation into the sediment (P inactivation) or by

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Figure 3 Macrophyte-dominated clear-water conditions (left) and phytoplankton-dominated turbid conditions (right) in shallow lakes.

Import

Export

Export

□ Temporary P s Permanent P

Figure 4 Phosphorus balance and main P fluxes in a lake, with potential possibilities to control the P concentration in the lake water (PLake). I indicates reduction of P load; R indicates increase of P retention, and E indicates increase of P export.

□ Temporary P s Permanent P

Figure 4 Phosphorus balance and main P fluxes in a lake, with potential possibilities to control the P concentration in the lake water (PLake). I indicates reduction of P load; R indicates increase of P retention, and E indicates increase of P export.

reducing P release from the sediment (aeration and oxygenation, nitrate addition, or sediment capping).

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