Effects of pH on nitrogen transformations in media-based aquaponics
2016; Elsevier BV; Volume: 210; Linguagem: Inglês
10.1016/j.biortech.2015.12.079
ISSN1873-2976
AutoresYina Zou, Zhen Hu, Jian Zhang, Huimin Xie, Christophe Guimbaud, Yingke Fang,
Tópico(s)Solar-Powered Water Purification Methods
ResumoTo investigate the effects of pH on performance and nitrogen transformations in aquaponics, media-based aquaponics operated at pH 6.0, 7.5 and 9.0 were systematically examined and compared in this study. Results showed that nitrogen utilization efficiency (NUE) reached its maximum of 50.9% at pH 6.0, followed by 47.3% at pH 7.5 and 44.7% at pH 9.0. Concentrations of nitrogen compounds (i.e., TAN, NO2(-)-N and NO3(-)-N) in three pH systems were all under tolerable levels. pH had significant effect on N2O emission and N2O conversion ratio decreased from 2.0% to 0.6% when pH increased from 6.0 to 9.0, mainly because acid environment would inhibit denitrifiers and lead to higher N2O emission. 75.2-78.5% of N2O emission from aquaponics was attributed to denitrification. In general, aquaponics was suggested to maintain pH at 6.0 for high NUE, and further investigations on N2O mitigation strategy are needed.
Referência(s)