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Installation and performance of horizontal wells for dewatering at municipal solid waste landfills in China

Installation and performance of horizontal wells for dewatering at municipal solid waste landfills in China
Installation and performance of horizontal wells for dewatering at municipal solid waste landfills in China
Vertical wells are conventionally used to lower leachate levels or pressures in municipal solid waste (MSW) landfills. However, they are not always efficient or even effective, and in some circumstances retro-fitted horizontal wells represent a potential alternative. However, horizontal wells can be difficult to install and there is a lack of data on their performance. This paper describes the trial construction and operation of three horizontal wells in a landfill at Tianziling, China. The trial was used to develop an improved well installation technique, and to demonstrate the viability of the approach in a typical Chinese landfill. Three wells, between 50 m and 56 m in length, were successfully installed using an improved casing-protected directional drilling method. Average leachate flow rates of two wells were 10.66 m3/day and 3.93 m3/day, respectively. After 74 days of drainage, the maximum leachate level drawdown around the highest flow well was 2.7 m and its distance of influence was up to 50 m. Building on the experience gained at Tianziling, a wellfield comprising twelve horizontal wells having a total length of 1000 m was installed at Xingfeng landfill. After 157 days of drainage, a total volume of ~24,000 m3 leachate had been discharged and the leachate level had been lowered to near the elevation of the horizontal wells. This paper indicates the effectiveness of horizontal wells in reducing leachate level in landfills containing MSW typical of that generated in China, and gives data on installation and performance that may be useful for the design and operation of such an approach.
Drilling, Flow rate, Horizontal well, Landfill, Leachate level, MSW
0956-053X
159-168
Hu, Jie
313dba4d-9066-4f4c-b5f9-286df525f435
Ke, Han
5661fb87-0745-4f10-8af0-ee2297048d6e
Zhan, Liang Tong
7fc606ce-3587-47f8-8a26-fecdd18fe3f9
Chen, Zu Yu
65dcdf94-863a-4641-8338-e3462b052afb
Lan, Ji Wu
03ee8930-8590-4a1d-9228-77419899279e
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Chen, Yun Min
9297a836-c59b-4d8a-a8a9-9fe32babb4b4
Hu, Jie
313dba4d-9066-4f4c-b5f9-286df525f435
Ke, Han
5661fb87-0745-4f10-8af0-ee2297048d6e
Zhan, Liang Tong
7fc606ce-3587-47f8-8a26-fecdd18fe3f9
Chen, Zu Yu
65dcdf94-863a-4641-8338-e3462b052afb
Lan, Ji Wu
03ee8930-8590-4a1d-9228-77419899279e
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Chen, Yun Min
9297a836-c59b-4d8a-a8a9-9fe32babb4b4

Hu, Jie, Ke, Han, Zhan, Liang Tong, Chen, Zu Yu, Lan, Ji Wu, Powrie, William and Chen, Yun Min (2020) Installation and performance of horizontal wells for dewatering at municipal solid waste landfills in China. Waste Management, 103, 159-168. (doi:10.1016/j.wasman.2019.12.035).

Record type: Article

Abstract

Vertical wells are conventionally used to lower leachate levels or pressures in municipal solid waste (MSW) landfills. However, they are not always efficient or even effective, and in some circumstances retro-fitted horizontal wells represent a potential alternative. However, horizontal wells can be difficult to install and there is a lack of data on their performance. This paper describes the trial construction and operation of three horizontal wells in a landfill at Tianziling, China. The trial was used to develop an improved well installation technique, and to demonstrate the viability of the approach in a typical Chinese landfill. Three wells, between 50 m and 56 m in length, were successfully installed using an improved casing-protected directional drilling method. Average leachate flow rates of two wells were 10.66 m3/day and 3.93 m3/day, respectively. After 74 days of drainage, the maximum leachate level drawdown around the highest flow well was 2.7 m and its distance of influence was up to 50 m. Building on the experience gained at Tianziling, a wellfield comprising twelve horizontal wells having a total length of 1000 m was installed at Xingfeng landfill. After 157 days of drainage, a total volume of ~24,000 m3 leachate had been discharged and the leachate level had been lowered to near the elevation of the horizontal wells. This paper indicates the effectiveness of horizontal wells in reducing leachate level in landfills containing MSW typical of that generated in China, and gives data on installation and performance that may be useful for the design and operation of such an approach.

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Accepted/In Press date: 20 December 2019
e-pub ahead of print date: 27 December 2019
Published date: 15 February 2020
Keywords: Drilling, Flow rate, Horizontal well, Landfill, Leachate level, MSW

Identifiers

Local EPrints ID: 439769
URI: http://eprints.soton.ac.uk/id/eprint/439769
ISSN: 0956-053X
PURE UUID: 311385e6-e25d-4dda-abe3-d7c0ee75c69b
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

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Date deposited: 01 May 2020 16:40
Last modified: 18 Feb 2021 16:43

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Contributors

Author: Jie Hu
Author: Han Ke
Author: Liang Tong Zhan
Author: Zu Yu Chen
Author: Ji Wu Lan
Author: William Powrie ORCID iD
Author: Yun Min Chen

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