Optimizing Nitrate and Nitrite Recovery from Aquaculture Wastewater Using Coffee Ground Biosorbent: Adsorption Mechanisms and Its Potential as Soil Conditioner
IF 4.3 3区 材料科学Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
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Abstract
Aquaculture wastewater (AW) is contaminated with nitrate (NO3−) and nitrite (NO2−), which can cause eutrophication if discharged without treatment. This study explores using coffee grounds biosorbent (CGB) to recover NO3− and NO2− ions from AW and reutilize the spent sorbent as a soil conditioner. The process study, adsorption isotherms and kinetics of the adsorption of NO3− and NO2− were deduced using several parameters and models. Spent sorbents were also compared with the commercial potting soil based on Okra plant growth metrics. The highest recovery efficiency for NO3− and NO2− was 98.6% and 95.0%, respectively, using 5 g/L of CGB with a 2-h contact time at pH 11. Adsorption followed the Freundlich isotherm and pseudo-first-order model, indicating multilayer adsorption on a heterogeneous surface. Optimal Okra growth was observed with 10% spent CGB (SCGB). This study highlights the potential of waste biosorbents for nutrient recovery and subsequent use as soil conditioners.
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