Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in areas with high rainfall and high groundwater level

doi:10.1007/s11783-014-0710-9

Front. Environ. Sci. Eng.

2016, Vol. 10

Issue (1) : 177-184 https://doi.org/10.1007/s11783-014-0710-9

RESEARCH ARTICLE

Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in areas with high rainfall and high groundwater level

Wenjing LU¹,Zhonge FU²,Yan ZHAO^3,^*(

)

1. School of Environment, Tsinghua University, Beijing 100084, China
2. Loudi Civil and Architecture Society, Loudi 417000, China
3. School of Environment, Beijing Normal University, Beijing 100875, China

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Abstract

A novel water control technology that combines the features of a reticular blind drainage system and a vertical hierarchical drainage system is developed and applied in the Yanziyan Sanitary Landfill, which is located at an area (Loudi City, Hunan Province, China) with high rainfall and high groundwater level. The reticular blind drain system, which was installed on the bottom and side walls of the landfill site, can conveniently guide the flow of groundwater out of the site while preventing a disorganized flow of groundwater. The vertical hierarchical drainage system was installed to separate rainfall water and leachate in the landfill site, thus efficiently reducing the pressure of leachate treatment. The whole drainage system plays a key role in foundation stabilization by seepage control and separation and in the instant drainage of rainfall water. The leachate reduction efficiency of the drainage technology was calculated in terms of leachate production before (336519 m³) and after (29664 m³) technology application. Over 90% of leachate derived from rainfall water and groundwater inflow was avoided upon installation of the vertical hierarchical drainage and reticular blind drainage systems. The technology can thus be popularized and applied for water control in landfills located in areas with high rainfall and high groundwater level. The proposed technology can be used to alleviate the pressure of leachate treatment and to reduce the risk of instability.

Keywords landfill reticular blind drain vertical hierarchical drain guidance and drainage impermeable layer

Corresponding Author(s): Yan ZHAO

Online First Date: 09 May 2014 Issue Date: 03 December 2015

Cite this article:

Wenjing LU,Zhonge FU,Yan ZHAO. Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in areas with high rainfall and high groundwater level[J]. Front. Environ. Sci. Eng., 2016, 10(1): 177-184.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0710-9
https://academic.hep.com.cn/fese/EN/Y2016/V10/I1/177

Tab.1 Waste amount in the Yanziyan Sanitary Landfill

Fig.1 Diagram of water balance and leachate formation of a landfill without water recharge

L – leachate generated; P – precipitation; ET – actual evapotranspiration; SR – surface runoff; CW – change in moisture content of waste; SI – surface water inflow; G – water vapor contained in landfill gas; U – water consumed by chemical or microbial processes; GI – groundwater inflow; GD – groundwater discharge

Tab.2 Meteorological data record in the Yanziyan Sanitary Landfill

Tab.3 Characteristics of the foundation soil in the landfill site

Tab.4 Leachate amount in the Yanziyan Sanitary Landfill

Tab.5 Water content and water loss ratio of landfilled waste

Fig.2 Reticular blind drains for groundwater drainage [20]: (a) reticular blind drain system; (b) cross profile of blind drains; (c) water filtration area and profile of guide pipe; (d) main guide pipe for groundwater

1– reticular blind drains; 2– ring blind drains at the bottom; 3– main guide pipe for groundwater; 4– fishbone-shaped blind drains; 5– fan-shaped guide pipes; 6– anchoring ditches; 7– loop flood intercepting trenches; 8 – gravels; 9 – geotextiles; 10– spring; 11– guide pipes; 12– water filtration area; 13– cover layer of clay; 14– seepage areas of gravels; 15– semicylinder culverts; 16– clay layer; 17– impermeable layer

Fig.3 Vertical hierarchical drains for rainfall water separation and faveolate guide pipe for rainfall water discharge

1 – anchoring ditches; 2 – loop flood intercepting trenches; 3 – guide pipes; 4 – guide pipe for leachate; 5 – vertical drain for rainfall water; 6 – impermeable layer set; 7 – waste dam; 8 – anchor ditch; 9 –vertical drain for leachate; 10 – faveolate guide pipes for rainfall water

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