Characterization of rice husk and cork as waste materials and its integration in a WETWALL system
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hdl:2117/111014
Correu electrònic de l'autoralexander.loehr.degmail.com
Tipus de documentProjecte Final de Màster Oficial
Data2017-06-16
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Abstract
Wastewater effluents from soilless crop cultivation contain high loads of nutrients and are poor in
organic carbon, what makes its purification with conventional treatment methods challenging and
expensive. Constructed Wetlands (CWs) have been proven to be a promising technology for the
treatment of hydroponic wastewaters, as nutrients can be removed mainly by adsorption, precipitation
and biological denitrification/nitrification processes. However, the provision of sufficient organic
carbon to maintain a continuous nutrient removal by microorganisms is still a key challenge. Moreover,
there is a lack of research on the potential of organic substrates that provide appropriate adsorption
capacities and can serve simultaneously as a source of carbon matter for denitrification. The aim of the
study is the investigation of untreated rice husk as possible substrate in CWs. In particular, the provision
of organic carbon and its removal potential for nutrients out of synthetic hydroponic wastewater is going
to be examined in greater detail. Therefore, an initial characterization of rice husk is carried out,
performing a Fourier-transform-infrared-spectroscopy (FTIR) and determining the point of zero charge
(pzc) by immersion technique. Subsequently, batch studies were performed to examine the influence of
pH and adsorbent dosage (Ad) on the release of organic carbon and the removal of nutrients. The study
shows that the rice husk surface contains mainly silica groups. In addition, it is a promising material in
the liberation of organic matter. An Ad of 100 g/L and a pH of 10 are found to be the optimum conditions
to release 508 mg/L of organic carbon after 24 hours. Moreover, batch studies reveal its capability in
the removal of nitrates. Under pH 4 and with an Ad of 100 g/L, a nitrate removal of 55% is observed.
MatèriesConstructed wetlands, Volatile organic compounds -- Environmental aspects, Zones humides artificials, Compostos orgànics volàtils -- Aspectes ambientals
TitulacióMÀSTER UNIVERSITARI EN CIÈNCIA I TECNOLOGIA DE LA SOSTENIBILITAT (Pla 2013)
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170320_Tesis_Master_v9jc.pdf | 1,273Mb | Accés restringit |