Direct Greenhouse Gas Emissions From a Pilot-Scale Aquaponics System

Highlights Direct greenhouse gas (GHG) emissions were measured in a decoupled aquaponics system. Solids concentration predicted methane the clarifier Lower pH plant system increased N 2 O emissions. Higher fish feeding rate CO and production Roughly half of direct GHG offset by carbon uptake during growth. Abstract. Agricultural systems are known to be large contributors global many studies have focused on mitigation from open-field other traditional crop practices. Little attention has been given non-traditional such as aquaponics. Here we determine (CO2, CH4, N2O) pilot-scale biofloc, facility. We also how unit operations differ based set environmental operational parameters e.g. temperature, rate, suspended solids, height, water flow nitrate levels. Major included biofloc tank stocked with tilapia, solids settling clarification system, climate-controlled which cucumber plants grown substrate culture. The study was separated into three seasons. In summer 2019, different treatments for irrigation tested. fall 2019 winter 2020, perlite versus pine bark substrates tested production. Measurements indicated that aerial intensively aerated areas 4.7 46.8 times higher than those low-intensity aeration. High (up 44.8 g m-2 d-1) anaerobic activity. Results showed negative relationship between N2O efflux (p=0.0001) while choice growth had no significant effect Overall, sequestration could 40% 62% This provides insight affect data support life cycle assessments. Keywords: Aquaculture, Carbon dioxide, Hydroponics, Methane, Nitrous oxide.