Effects of pH on nitrogen transformations in media-based aquaponics

Bioresource Technology
Yina ZouYingke Fang

Abstract

To 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.

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Citations

Aug 31, 2016·Bioresource Technology·Brunno da Silva Cerozi, Kevin Fitzsimmons
May 15, 2020·Food Science & Nutrition·Sunday Abraham OladimejiAnuar Hassan
May 27, 2017·Environmental Science and Pollution Research International·Dongyun RuZhenting Lv
Jan 12, 2017·Archives of Microbiology·Zala SchmautzTheo H M Smits
Apr 21, 2018·Environmental Science and Pollution Research International·Mariel Gullian KlanianCarolina Rosales Juárez
Jun 12, 2017·Environmental Science and Pollution Research International·Juan WuJingwei Hu
Nov 8, 2020·Journal of Hazardous Materials·Jiaxiong WuShungui Zhou
May 9, 2021·Bioresource Technology·M K ManuJonathan W C Wong
Jun 22, 2021·Frontiers in Plant Science·Liliana Cifuentes-TorresLeopoldo G Mendoza-Espinosa
Sep 29, 2018·Environmental Science & Technology·Sumeth WongkiewSamir Kumar Khanal
Aug 29, 2021·Applied Microbiology and Biotechnology·Peyman DerikvandLisa Y Stein

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