A novel soil-bentonite backfill is proposed for use in vertical cutoff walls to contain phenol in groundwater at contaminated sites. The backfill consists of sand and bentonite modified with tetramethylammonium and carboxymethylcellulose, labeled as STCMB backfill. Flexible-wall permeability and double-reservoir diffusion tests were conducted to investigate the impact of phenol solution on hydraulic conductivity (k), effective diffusion coefficient (D*) and partition coefficient (K) of the backfill, respectively. The permeability results showed k of the STCMB backfill decreased by 0.91 times when the permeating liquid was changed from tap water to phenol solution. The diffusion testing results showed that D* values for the STCMB and conventional backfill (labeled as SCB backfill) were 4.0 × 10 m/s and 3.0 × 10 m/s, respectively, whereas K values for the STCMB and SCB backfills were 2.0 mL/g and 0.75 mL/g, respectively. The octanol-water partition coefficient model is suitable for estimating K for nonpolar organics. Furthermore, a series of solute transport simulations using Pollute V7 program was performed to evaluate the performance of vertical cutoff walls comprising STCMB and SCB backfills in containing phenol in lateral flowing groundwater. Overall, the STCMB backfill has demonstrated superior effectiveness in containing phenol in groundwater.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2023.132627 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Impact of Low Muscle Mass and Bone Mineral Density on Long-Term Outcomes of Acute Ischemic Stroke: A prospective study.
Clin Nutr ESPEN
December 2024
Hacettepe University, Faculty of Medicine, Department of Neurology, Ankara, Turkey; Hacettepe University Faculty of Medicine, Department of Neurology, Neurology Intensive Care Unit, Stroke Unit, Ankara. Electronic address:
Background: Premorbid sarcopenia, osteoporosis, and obesity are epiphenomena that affect survival and functional outcomes in patients with acute ischemic stroke. The effects of preexisting sarcopenia and/or osteopenia on long-term outcome after ischemic stroke were herein prospectively studied.
Methods: Dual-energy x-ray absorptiometry (DeXA), bio-impedance analysis (BIA) and muscle ultrasonography (US) data were prospectively collected within the first 72 hours in 297 consecutive acute ischemic stroke patients (45.
Prediction of the success of orthodontic treatment of impacted maxillary canines using panoramic radiography parameters: a retrospective cross-sectional study.
BMC Oral Health
December 2024
Faculty of Dentistry, Department of Orthodontics, Ondokuz Mayıs University, Atakum, Samsun, 55139, Turkey.
Background: This retrospective study aimed to investigate the relationships between the radiographic features of impacted maxillary canines (IMCs) and traction duration and the factors affecting treatment success.
Methods: Pre-treatment panoramic radiographs and patient records of 121 consecutive patients with IMCs were analyzed. The measurements included the angle of the IMC with the midline (α-angle), the horizontal position of the IMC relative to the adjacent teeth (S-Sector), the distance from the IMC to the occlusal plane (d-distance), the apex position of the IMC (A), and the vertical height of the IMC relative to the adjacent lateral tooth (V).
Investigation of predictors of latent visual impairment in patients with sellar lesions.
J Neurosurg
December 2024
Departments of1Neurosurgery and.
Objective: Patients with sellar lesions compressing the optic nerve sometimes perceive visual improvement after lesion resection, despite the absence of visual impairment on preoperative ophthalmological examination. This study investigated the indicators of latent visual impairment in patients with sellar lesions.
Methods: Forty-five patients who underwent surgery for sellar lesions compressing the optic nerve with no preoperative visual abnormalities and no change in visual assessment between pre- and postoperative ophthalmological examinations were divided into two groups: 1) patients who perceived recovery of visual function after lesion resection (the improved group), and 2) patients who did not (the unaffected group).
Group velocity dispersion curves estimation based on joint processing of sound pressure and vertical particle velocity.
JASA Express Lett
December 2024
National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.
It is difficult to separate and estimate the intersected group velocity dispersion curves for different normal modes when the frequency is lower than the cutoff frequency of water column. To address this issue, an estimation method based on the joint processing of sound pressure (P) and vertical particle velocity (Vz) is proposed in this paper. Theoretical analysis shows that the amplitudes of P and Vz corresponding to the nth normal mode exhibit a complementary relationship in the certain frequency band, providing a theoretical basis for the method.
View Article and Find Full Text PDFVideo-oculography for enhancing the diagnostic accuracy of early oculomotor dysfunction in Progressive Supranuclear Palsy.
J Mov Disord
December 2024
Parkinson and Movement Disorder Centre, Department of Neurology, Aster Medcity, Kochi, Kerala, India.
Background: Oculomotor impairment is an important diagnostic feature of Progressive Supranuclear Palsy (PSP) and PSP subtypes.
Objectives: We assessed the role of video oculography (VOG) in confirming clinically suspected slow saccades in PSP and differentiating PSP from Parkinson's disease (PD). We also measured the correlation of both saccadic velocity and latency in PSP with scores in PSP rating scale, Montreal Cognitive Assessment (MoCA) and Frontal assessment battery (FAB).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!