Simple method for determining breakthrough time of anti-seepage liners in landfill

Patent metadata

Field	Value
Publication number	US-10260212-B2
Application number	US-201715767651-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Dec 14, 2016
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A method for determining breakthrough time of anti-seepage liners in a landfill, includes (a) detecting a leachate sample of the landfill to determine the initial concentration C 0 of pollutants, and monitoring the leachate head h of the landfill; (b) determining the pollution-causing concentration C A of the pollutants according to functional orientation of local groundwater of the landfill; (c) determining, related parameters of the anti-seepage liners including the thickness z of the anti-seepage liners, the permeability coefficient k of the liners, and the porosity n of the material of the liners, and determining the related parameters of pollutant migration including the effective diffusion coefficient D a * and the mechanical dispersion coefficient D m of the pollutants in the anti-seepage liners, and the adsorption retardation factor R d of the anti-seepage liners on the pollutants; and (d) calculating the breakthrough time t of the anti-seepage liners according to a formula,

t
=

nR
d

⁢

z
2

(

h
+
z

)

⁢
k

⁢

(

(

a
⁡

(

C
0

C
A

)

b

)

⁢

ln
⁡

(

(

h
+
z

)

⁢
k

n
⁡

(

D
a
*

+

D
m

)

)

+
c

)

.

First claim

What is claimed is:

1. A method for determining breakthrough time of anti-seepage liners in a landfill, comprising the following steps:
(a) detecting a leachate sample of the landfill to determine an initial concentration C o of pollutants, and monitoring a leachate head h-of the landfill;
(b) determining a harm-causing or pollution-causing concentration C A of the pollutants according to a functional orientation of local groundwater of the landfill;
(c) determining, related parameters of the anti-seepage liners and related parameters of pollutant migration, the related parameters of the anti-seepage liners comprising the thickness z of the anti-seepage liners, a permeability coefficient k of the anti-seepage liners, and a porosity n of a material of the anti-seepage liners; and the related parameters of pollutant migration comprising an effective diffusion coefficient D a * and a mechanical dispersion coefficient D m of the pollutants in the anti-seepage liners, and an adsorption retardation factor R d of the anti-seepage liners on the pollutants; and
(d) calculating the breakthrough time t of the anti-seepage liners according to a formula:

t
=

nR
d

⁢

z
2

(

h
+
z

)

⁢
k

⁢

(

(

a
⁡

(

C
0

C
A

)

b

)

⁢

ln
⁡

(

(

h
+
z

)

⁢
k

n
⁡

(

D
a
*

+

D
m

)

)

+
c

)

where a, b, c are state coefficients independently.

2. The method for determining breakthrough time of anti-seepage liners in a landfill according to claim 1 , wherein in step (a), the initial concentration C o of the pollutants is detected.

3. The method for determining breakthrough time of anti-seepage liners in a landfill according to claim 1 , wherein a is 0.2899, b is −0.1343, and c is −0.01094.

Assignees

• Univ Hohai

Inventors

• Zhu Wei
• Shu Shi
• Wang Shengwei
• Xu Haoqing
• Fan Xihui

Classifications

• E02D2450/106

  for liquids · CPC title

• E02D31/004 Primary

  Sealing liners · CPC title

• E02D31/006 Primary

  Sealing of existing landfills, e.g. using mining techniques · CPC title

• E02D2300/0037

  Clays · CPC title

• E02D31/00 Primary

  Protective arrangements for foundations or foundation structures {(protective casings for piles E02D5/60)}; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution (spillage retaining means for tanks B65D90/24) · CPC title