Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Nitrogen and Phosphorus Release Characteristics of Pipeline Sediments on Entering Different Water Bodies

Version 1 : Received: 18 April 2023 / Approved: 23 April 2023 / Online: 23 April 2023 (02:56:37 CEST)

A peer-reviewed article of this Preprint also exists.

Sun, J.; Xue, C.; Li, J.; Wang, W. Nitrogen and Phosphorus Release Characteristics of Pipeline Sediments on Entering Different Water Bodies. Water 2023, 15, 1903. Sun, J.; Xue, C.; Li, J.; Wang, W. Nitrogen and Phosphorus Release Characteristics of Pipeline Sediments on Entering Different Water Bodies. Water 2023, 15, 1903.

Abstract

Differences in the physical and chemical properties of reclaimed water (RW) and natural surface water (SW) lead to the differences in terms of nitrogen and phosphorus release when pipeline sediments enter these water bodies. The nitrogen and phosphorus release kinetics from pipe sediments with different particle sizes have been investigated. The results demonstrated that both SW and RW had a pH buffering effect after sediment addition, and the final pH (approximately 8.1) of RW was lower. The release of total phosphorus (TP) and ammonia nitrogen ( NH4+-N) fitted the first-order kinetic model where the release of TP reached equilibrium; TP release was inhibited in both SW and RW, where RW exhibited the lowest (by a factor of 1.23~2.44) release (0.002 mg/g). The release of NH4+-N was promoted in both SW and RW; the maximum release in RW was 0.0188 mg/g. The amounts of NH4+-N released in SW and RW were 1.02-1.40 and 1.30-1.80 times that of the control group (CG), respectively. The percentage of TP and NH4+-N release in the three groups was highest in 75-154 μm pipe sediment, reaching 34.53% and 43.51% in SW and RW, respectively. These results can assist in the development of water quality evolution models for specific urban scenarios, and provide important guidance for the precise regulation of recharge water quality during and after rainfall.

Keywords

pipeline sediment; reclaimed water; surface water; release of TP and NH4+-N

Subject

Environmental and Earth Sciences, Environmental Science

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