SPECIFIC SELECTION OF FILLERS OF SUBSURFACE FLOW WETLAND AND THE REMOVAL EFFECT OF PO<sub>4</sub><sup>3-</sup>-P

WANG Ruo-fan; WANG Wen-fei; WANG Yu-jun; SHENG Yang; YANG Si-yu; LI Hai-chao

doi:10.13205/j.hjgc.202003015

Volume 38 Issue 3

Jun. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(3): 87-91

WANG Ruo-fan, WANG Wen-fei, WANG Yu-jun, SHENG Yang, YANG Si-yu, LI Hai-chao. SPECIFIC SELECTION OF FILLERS OF SUBSURFACE FLOW WETLAND AND THE REMOVAL EFFECT OF PO43--P[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 87-91. doi: 10.13205/j.hjgc.202003015

Citation:

WANG Ruo-fan, WANG Wen-fei, WANG Yu-jun, SHENG Yang, YANG Si-yu, LI Hai-chao. SPECIFIC SELECTION OF FILLERS OF SUBSURFACE FLOW WETLAND AND THE REMOVAL EFFECT OF PO₄^3--P[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 87-91. doi: 10.13205/j.hjgc.202003015

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SPECIFIC SELECTION OF FILLERS OF SUBSURFACE FLOW WETLAND AND THE REMOVAL EFFECT OF PO₄^3--P

doi: 10.13205/j.hjgc.202003015

School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Received Date: 2019-03-04

Abstract

Abstract

In order to solve the problem of non-point source pollution of domestic sewage in rural area of western China, adsorption kinetics and thermodynamics tests were carried out to determine the adsorption characteristics of PO₄^3--P in 6 kinds of natural and artificial subsurface flow wetland fillers. The results showed that the adsorption equilibrium time of the fillers were 24 h, and the kinetic adsorption process of PO₄^3--P was in accordance with the Elovich model. The equilibrium concentration of gravel, concrete, red tile, ceramic tile and biochar to PO₄^3--P were 40 mg/L, when the temperatures were in 15~35 ℃. The adsorption process of PO₄^3--P to gravel and biochar accorded with Langmuir model, and that of concrete, ceramic tile, red brick and anthracite accorded with Freundlich model. The adsorption process was mainly based on physical adsorption and heat absorption. The adsorption of PO₄^3--P in the packing was not a self-development process. At 24 h, the removal rate of PO₄^3--P by concrete was 73.45%. Therefore, concrete had the best adsorption effect on PO₄^3--P and was proved to be more suitable for wetland filling.
- subsurface flow wetland fillers,
- phosphate kinetic adsorption,
- thermodynamic adsorption,

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