Highly efficient removal of phosphorus from agricultural runoff by a new akadama clay barrier-vegetated drainage ditch system (VDD) and its mechanism

TY - JOUR

T1 - Highly efficient removal of phosphorus from agricultural runoff by a new akadama clay barrier-vegetated drainage ditch system (VDD) and its mechanism

AU - He, Yan

AU - Zhou, Xueqiu

AU - Zhang, Qiongyue

AU - Gu, Ji Dong

AU - Zhang, Yanzong

AU - Liu, Yan

AU - Wang, Lilin

AU - Xiao, Yinlong

AU - Shen, Fei

AU - Deng, Shihai

AU - Zhang, Shirong

AU - Luo, Ling

N1 - Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/7/15

Y1 - 2021/7/15

N2 - A vegetated drainage ditch (VDD) system is an effective management practice for removing excess phosphorus (P) from agricultural runoff. However, the maximization of P removing efficiency by VDD remains a challenge. In this study, new VDDs with akadama clay barriers (particle size of clay: 1–6 mm; height of barrier: 5–15 cm and length of barrier: 10–90 cm) were designed in lab scale, and the mechanism of phosphate removal by akadama clay was investigated. It was found that a new VDD with akadama clay barriers (particle size:1 mm; height:10 cm and length: 90 cm) exhibited the highest removal efficiency of total P (TP) (97.1%), particulate P(PP) (96.9%), and dissolved P (DP) (97.4%), respectively. The retained P was mainly adsorbed in akadama clay barrier sections, and a low concentration of P was observed in soil sections in the new VDD. The maximum adsorption capacity of phosphate to akadama clay was 5.06 mg/g at 298 K, and XPS analysis indicated that phosphate was adsorbed by the inner-sphere complexation formation with the metal elements (Al, Fe). This study indicates that the new VDD with akadama clay barriers is a promising technique to efficiently remove P from agricultural runoff and significantly minimize the risk of P release into streams through runoff.

AB - A vegetated drainage ditch (VDD) system is an effective management practice for removing excess phosphorus (P) from agricultural runoff. However, the maximization of P removing efficiency by VDD remains a challenge. In this study, new VDDs with akadama clay barriers (particle size of clay: 1–6 mm; height of barrier: 5–15 cm and length of barrier: 10–90 cm) were designed in lab scale, and the mechanism of phosphate removal by akadama clay was investigated. It was found that a new VDD with akadama clay barriers (particle size:1 mm; height:10 cm and length: 90 cm) exhibited the highest removal efficiency of total P (TP) (97.1%), particulate P(PP) (96.9%), and dissolved P (DP) (97.4%), respectively. The retained P was mainly adsorbed in akadama clay barrier sections, and a low concentration of P was observed in soil sections in the new VDD. The maximum adsorption capacity of phosphate to akadama clay was 5.06 mg/g at 298 K, and XPS analysis indicated that phosphate was adsorbed by the inner-sphere complexation formation with the metal elements (Al, Fe). This study indicates that the new VDD with akadama clay barriers is a promising technique to efficiently remove P from agricultural runoff and significantly minimize the risk of P release into streams through runoff.

KW - Adsorption of phosphorus

KW - Akadama clay barrier

KW - Phosphorus removal efficiency

KW - Vegetated drainage ditch

UR - http://www.scopus.com/inward/record.url?scp=85103969181&partnerID=8YFLogxK

U2 - 10.1016/j.jenvman.2021.112575

DO - 10.1016/j.jenvman.2021.112575

M3 - 文章

C2 - 33862319

AN - SCOPUS:85103969181

SN - 0301-4797

VL - 290

JO - Journal of Environmental Management

JF - Journal of Environmental Management

M1 - 112575

ER -