Lemna gibba (Lemnaceae) had been experimented in Morocco to develop macrophyte-based wastewater treatment
systems adapted to the local climatic and socio-economic circumstances. This species growing on pre-treated
urban wastewater, in a lagoon (Lemna bioreactor) operating in fed-batch, generates a net productivity of
28.39 t dw.ha 1.yr 1, through regular harvest of the biomass produced. In wet seasons the roots of this
macrophyte generally exceed 10 cm. The Lemna lagoon clearly reduces plankton production, especially during
the vegetative period, when compared to the bioreactor without macrophytes (lagoon; chlorophyll-a concentration
of 86.4 � 168 μg. l 1). The Lemna bioreactor also removes more particulate nitrogen (N) and phosphorus
(P), and shows a highly significant total P and significant non-particulate P retention, in comparison with the
lagoon. L. gibba can export daily the equivalent of 13.2% of N and 19.9% of P entering the bioreactor. The algal
flora is dominated throughout the year by phytoplanktonic populations of Euglenophyceae and Chlorophyceae.
Branchiopoda (Daphniidae), Insecta (Dytiscidae Chironomidae, Culicidae and Heteroptera), and Gastropoda are the
main taxa of animalia developing in the Lemna bioreactor. In the Mediterranean climate, the L. gibba bioreactors
would be more profitable in the tertiary wastewater treatment, especially P removal, provided regularly collect
of the biomass produced.
تاريخ النشر
04/10/2019
الناشر
Journal of Environmental Management
رقم المجلد
252
رقم العدد
رابط DOI
https://doi.org/10.1016/j.jenvman.2019.109627
الكلمات المفتاحية
Lemna gibba L. Wastewater Nitrogen Phosphorus Biomass Bioreactor
عبد السلام النبيلي | Abdeslam Ennabili | 5748