removal mechanisms
TRANSCRIPT
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Removal mechanisms
Suspendedsolids
Organic matter
Heavymetals
Nutrients
- Phosphorus
- Nitrogen
- Aerobic- Anoxic
- Anaerobic
PrecipitationFiltration
Biochemicaloxidation
Adsorption
Vegetable assimilation
SolubilitationDegradation of organic matter
Biologic:
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Removal mechanismsAerobic:Degradation of organic matter; biochemical oxidation
Anaerobic:Degradation of persistent organic matter
Anoxic:Reduction of nitrates
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► Organic matter
Removal mechanisms
Bacterial activity and vegetable assimilation• Carbohydrates
(aerobic)
• Persistent organic compounds (anaerobic)
• Phenols
• Pesticides/Insectisides
• Greases and Oils
• Hydrocarbons
• Surfactants
• 1012 bacteria per gramm of soil
• 5000 different types of bacteria
Anaerobiczones:
Aerobiczones:
Oxidation zone Energy
Energy
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• Reduced filtering speeds
• Shallow depths
• Filtration through vegetable matter and plant’s roots
• Interaction with organic bed (soil)
►Suspended solids
Removal mechanisms
Filtration andprecipitation
Oxigeno
Zona de reducciónZona de oxidación
Aerobiczone
Oxygen
Oxidation zone
Reduction zone
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► NutrientsSolubilitation through bacterial activity and vegetable assimilation
• Absorption in clayey minerals
• Chemical precipitation:
Alkaline (Ca): Ca5(PO4)3OH
Acid (Fe / Al): FePO4 / AlPO4
Phosphorus
• Reduction of NO3 (nitrate) to N2 (free nitrogen) by anoxic processes
Nitrogen
2NO3 + 2H N2 + H20 +2,5 02 (Desnitrificación)
Removal mechanisms
Aerobiczone
Anoxic zone
Oxygen
(Denitrification)
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► Heavy metals
Removed by adsorption andvegetableassimilation
• in acid pH: solubilized in anoxic zones
• in alkaline pH: precipitation in aerobic zones
• Retained and assimilated by plant’s roots
Removal mechanisms