Effect of Mangrove Biochar Residue Amended Shrimp Pond Sediment on Nitrogen Adsorption and Leaching

Sokkeang Be, Soydoa Vinitnantharat and Anawat Pinisakul
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Sokkeang Be: Chemistry for Green Society and Healthy Living Research Unit (ChGSH), Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology, Bangkok 10140, Thailand
Soydoa Vinitnantharat: Environmental Technology Program, School of Energy, Environment and Materials, King Mongkut’s University of Technology, Bangkok 10140, Thailand
Anawat Pinisakul: Chemistry for Green Society and Healthy Living Research Unit (ChGSH), Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology, Bangkok 10140, Thailand

Sustainability, 2021, vol. 13, issue 13, 1-19

Abstract: Mangrove biochar residue was used for nitrogen adsorption and retention in sediment, which is beneficial for plant germination. The present study investigated the effect of contact time (5–360 min), biochar dosage (0.2–2 g L −1 ), pH (5–6), and initial concentration (2–10 mg L −1 ) on NH 4 + -N and NO 3 − -N adsorption. Three different adsorption isotherm models were used to fit the experimental data. Column leaching experiments were conducted to investigate the effect of biochar with sediment from a shrimp pond on nitrogen leaching at varying biochar dosages (0–8% w / w ). The results showed that the maximum percentage of both NH 4 + -N and NO 3 − -N adsorption was achieved at an equilibrium contact time of 240 min, with an adsorbent dosage of 2 g L −1 , and pH at 5.5 and 5, respectively. The adsorption of NH 4 + -N and NO 3 − -N were fitted to the Freundlich model and the adsorption process followed the physisorption and ion exchange. The addition of 8% biochar reduced both cumulative water volume and nitrogen leaching from the sediment. The biochar amendment increased the relative abundance of nitrifying and denitrifying bacteria in the sediment. This result suggested that biochar amended with sediment could be useful for nitrogen loss reduction.

Keywords: adsorption isotherm; biochar; nitrogen leaching; nitrogen retention; pond sediment; shrimp farm (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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