Transport Model of Fluids Injected in a Landfill Polluted with Lindane Wastes

Lorenzo, David; Sanots, Aurora; Domı́nguez, Carmen; Guadaño, Joaquín; Gómez, Jorge Castilla; Fernández, Jesús García

doi:10.1016/b978-0-12-823377-1.50103-8

Cited by 2 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Table S3, the fluid injected (7.20 m 3 ) shows a high radial dispersion during the injection, as reported elsewhere [23,33]. Surfactant dimensionless concentration is always lower than dimensionless bromide concentration.…”

Section: Results Obtained In the Injection Eventssupporting

confidence: 78%

“…The results are shown elsewhere [23]. A high radial dispersion of the injected fluid was found [33]. In addition, a significant decrease of the surfactant in the solution was noticed during the time elapsed between injection and extraction due to surfactant adsorption in soil and surfactant absorption in DNAPL (extraction was carried out 16 h after the injections stopped), in agreement with laboratory findings [30].…”

Section: Introductionsupporting

confidence: 78%

See 1 more Smart Citation

Remediation of the Alluvial Aquifer of the Sardas Landfill (Sabiñánigo, Huesca) by Surfactant Application

Guadaño¹,

Gómez²,

Fernández

et al. 2022

Sustainability

Self Cite

View full text Add to dashboard Cite

Sardas Landfill at Sabiñánigo Huesca is polluted with Dense Non-Aqueous Liquid Phases (DNAPLs) composed of a complex mixture of chlorinated organic compounds (COCs). This DNAPL was produced as liquid waste from lindane production being dumped decades ago in the unlined landfills close to the lindane factory. This DNAPL migrated by gravity through the subsurface and accumulated in the contact between the alluvial and marls layers (about 15 m b.g.l.). Seven injections of an aqueous emulsion of a biodegradable non-ionic surfactant (E-Mulse 3 ®) were carried out at the most polluted areas of the Sardas alluvial. Injections were carried out between April and November 2021 using different surfactant concentrations (6.7, 20, 25 and 50 g/L), injection volumes (0.2 to 7 m3) and injection flow rates (0.08–0.85 m3/h). Injected fluids were extracted in the same well or surrounding wells, and the time elapsed between surfactant injection and extraction varied between 24 and 72 h. A total of 22 m3 were injected into the alluvial, and more than double this injected volume was extracted. Injection and extraction points were in the contact between the marls and the alluvial layer. Extracted fluid accumulated in tanks, and phases separated. DNAPL recovered here was mobilized rather than solubilized and managed as toxic waste. The aqueous supernatant was treated in a wastewater treatment plant with physicochemical treatment (including adsorption in activated carbon) before being discharged into the environment. The transport of the injected fluids was monitored by conductivity profiles using bromide (260–538 mg·L−1) as a conservative tracer. High radial dispersion of the injected fluid was found. Surfactant losses by adsorption in the alluvial and absorption in DNAPL were noticed, and both surfactant and contamination did not escape from the capture zone. Monitoring since 2018 of the COCS in groundwater and the DNAPL presence in the contact between alluvial and marls layers showed a significant reduction of COCs in the treated zone with the surfactant injections.

show abstract

Section: Results Obtained In the Injection Eventssupporting

confidence: 78%