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The recycling effect in the nitrification-denitrification process in vertical flow constructed wetlands
Martí Zapater, Estanislao
Arias, Carlos; Brix, Hans; García, Joan; Universitat Politècnica de Catalunya. Departament d'Enginyeria Hidràulica, Marítima i Ambiental
Uncontrolled discharge of nutrient rich wastewater to the environment is a common source of pollution and itis partly responsible for the eutrophication of surface water, as well as degradation of the quality ofgroundwater. Constructed wetlands have proven to be an effective and affordable alternative to reduce BOD,suspended solids and even to reduce the concentration of nutrients from domestic wastewater, if the design,operation and establishment of the system meet certain conditions.Two of the most important nutrients are nitrogen and phosphorus. To remove nitrogen it is necessary thatfirst nitrification and then denitrification occurred. The first process is aerobic and autotrophic bacteria carryit out whereas denitrification happens in anoxic conditions by heterotrophic bacteria. Phosphorus is removedbasically by precipitation with aluminium, iron and calcium.This paper shows the removal processes of these nutrients as well as the removal of undesirable wastewaterparameters through a system made up of the following components: (i) a 2-m3 three chamber sedimentationtank; (ii) a first stage 10-m2 vertical flow constructed wetland; (iii) three P-filter units; and (iv) a second stage5-m2 vertical flow CW. The pilot plant is placed in the vicinity of Århus (Østjylland, Denmark), and thestudy took place between October 2002 and January 2003. Furthermore, these results have been validated inan operational single household autonomous system.
Àrees temàtiques de la UPC::Enginyeria civil
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària
Aigües residuals -- Depuració -- Eliminació de nitrogen
Aigües residuals -- Depuració -- Eliminació de fosfats
Residus orgànics -- Reciclatge -- Zones humides
Aigües residuals -- Depuració
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Bachelor Thesis
Universitat Politècnica de Catalunya

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