Study on phosphorus releasing and releasing kinetics of sediments in Dongping Lake

Li, Yang; Zhang, Chuanxing; Li, Pengfei; Wang, Jingjing; Zhou, Wenlu; Zhang, Yanhao

doi:10.1016/j.hazadv.2023.100234

Cited by 3 publications

(1 citation statement)

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“…Phosphorus (P) in sediment has the potential to be released, leading to continued eutrophication [1][2][3][4][5]. Even after using remediation techniques to reduce external P loadings, internal P release resulting from iron (Fe) reduction in sediment has been determined to be a primary issue against lake restoration [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Release from Agricultural Drainage Sediments with Iron-Added Sediment Microbial Fuel Cells

Perera,

Maeda,

Akao

et al. 2024

J. of Wat. & Envir. Tech.

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This study investigated the long-term performance of iron-added sediment microbial fuel cells (SMFCs) in suppressing phosphorus (P) release from agricultural drainage sediments. Sediment samples were collected from two drainage canals in livestock farming (LS) and pasture-grown (PS) areas in Kasaoka, Japan. Iron-added sediments were prepared by mixing FeCl 3 •6H 2 O at 0.05% (wt/wt). A graphite-felt anode and a carbon rod cathode were used in a dual-chamber SMFC (height: 146 mm, diameter: 45 mm), which was operated under open (OC) or closed circuit (CC) conditions at 25°C. The experiments consisted of 8 treatments in triplicate: LS and PS sediments × Fe or no-Fe × OC or CC. Phosphorus release from LS sediment was higher than from PS with a lower total P content. Under the SMFC operation, P release was reduced until day 42. Afterward, P concentrations became similar between OC and CC conditions, and iron addition increased P release from sediment, probably because of P mineralization. Our study suggested that SMFCs effectively reduced P through Fe precipitation until day 42, when the resistor was reduced. However, SMFC operation or iron addition would increase organic matter decomposition in sediment, which in turn enhanced P release from sediment.

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