Title

Case Study Of Landfill Leachate Recirculation Using Small-Diameter Vertical Wells

Keywords

Bioreactor landfill; Injection pressure; Leachate recirculation; Municipal waste; Vertical wells; Well performance

Abstract

A case study of landfill liquids addition using small diameter (5cm) vertical wells is reported. More than 25,000m3 of leachate was added via 134 vertical wells installed 3m, 12m, and 18m deep over five years in a landfill in Florida, US. Liquids addition performance (flow rate per unit screen length per unit liquid head) ranged from 5.6×10-8 to 3.6×10-6m3s-1 per m screen length per m liquid head. The estimated radial hydraulic conductivity ranged from 3.5×10-6 to 4.2×10-4ms-1. The extent of lateral moisture movement ranged from 8 to 10m based on the responses of moisture sensors installed around vertical well clusters, and surface seeps were found to limit the achievable liquids addition rates, despite the use of concrete collars under a pressurized liquids addition scenario. The average moisture content before (51 samples) and after (272 samples) the recirculation experiments were 23% (wet weight basis) and 45% (wet weight basis), respectively, and biochemical methane potential measurements of excavated waste indicated significant (p<0.025) decomposition.

Publication Date

11-1-2014

Publication Title

Waste Management

Volume

34

Issue

11

Number of Pages

2312-2320

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.wasman.2014.07.005

Socpus ID

84907565451 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84907565451

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