Development and Evaluation of Lamella Settlers Combined with Electrocoagulation for Treating Suspended Sediment

Liu, Lan; Perez, Michael A.

doi:10.1061/(asce)ir.1943-4774.0001680

Cited by 3 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Settling is a widely used operation particularly employed for clarification of wastewaters from different industries and for urban stormwaters. − For instance, within the mining industry, sedimentation technology is a convenient alternative for the secondary treatment of turbid waters. Appropriate treatment of tailings has become very important related to the sustainability of the plants, and the flexibility of sedimentation allows its application to different tailings …”

Section: Introductionmentioning

confidence: 99%

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

Fleite,

Maestri,

García

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Determining and controlling the trajectory of solid flocs in a settler are of paramount importance to ensure the desired solid−liquid separation. This work evinces the feasibility of determining the motion of solid particles in a lamellar settler by using radioactive particle tracking and extracting relevant dynamic information from an approximate two-dimensional (2D) reconstruction. The experimental procedure involves simultaneously scanning different regions of the settler with scintillation detectors located at a given distance from the examined vessel while a radioactive tracer particle is freely moving inside. The complete reconstruction considers the system geometry, the attenuation of the medium (water), the activity of the radioactive tracer, and the efficiency of the detectors, determined by calibration. The approximate reconstruction considers that the detectors located closer to the tracer are the ones that record the largest number of counts. Then, searching for the detector with the highest number of counts and considering the ratio of the intensity measured by the closest ones, an approximate tracer axial bidimensional location is estimated. Compared to the results given by the radioactive particle tracking (RPT) technique, although the information extracted is more limited, the approximate experimental procedure has the advantage of not requiring a calibration stage, which could be complex for systems with varying solid holdup. Analysis of the particles' trajectories obtained with this methodology can be quite useful to assess a proper design of the settler. For instance, the upper limit of the working flow rate and the mean residence time of the flocs before settling can be determined. The particle motion is simulated with a volume-of-fluid (VOF) method implemented in Gerris open-access software, and compared to the experimental results.

show abstract

Section: Introductionmentioning

confidence: 99%

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

Fleite,

Maestri,

García

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Kang and McLaughlin ( 20 ) focused on incorporating flocculants with geotextile dewatering bags for treating construction stormwater runoff before off-site discharge and observed up to 97% turbidity reduction. Liu and Perez ( 40 ) investigated the flocculation effectiveness using electrocoagulation as an alternative to chemical dosage and achieved 98% capture effectiveness. These studies showed how flocculation may enhance turbidity reduction in construction stormwater runoff when applied with proper product selection, dosage, and application.…”

Section: Introductionmentioning

confidence: 99%

Optimum Dosage and Product Selection Guidance for Flocculant Usage in Construction Stormwater Treatment

Kazaz

Perez

Donald

et al. 2023

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

Implementing proper methods and techniques for construction stormwater management brings numerous benefits in protecting the environment, maintaining social justice, and enhancing sustainability within the construction industry. Flocculants improve construction stormwater management on active job sites by enhancing the function of temporary sediment control practices by facilitating the capture of fine-sized soil particles that are otherwise difficult to settle. The performance of flocculants is dependent on specific soil properties, dosage, and application techniques. Proper product selection and identification of adequate dosage rates is an arduous task for practitioners given the soil variability across job sites and a lack of implementation guidance. This study investigated the performance of various commercially available flocculant products on 15 soil samples collected from construction sites across Alabama through bench-scale testing methods. Experiments focused on providing guidance on product selection and identifying optimum dosage rates through soil assessment, match tests, and dosage experiment phases. The performance of polyacrylamide, sodium montmorillonite, chitosan, agricultural gypsum, and alum-based products was investigated across all soil samples for product selection. Dosage of selected products was evaluated by ranging manufacturers’ dosage recommendations from 0% to 200% to evaluate settling performance across a range of dosing conditions. Results indicated that increasing recommended dosage rates negatively affected the turbidity reduction performance of tested products. In general, dosages lower than 40% manufacturer recommended rates showed a statistically significant improvement in turbidity reduction at a 95% confidence level. The study provides insight for practitioners and future research agendas on the proper usage of flocculants in the construction industry.

show abstract

Stormwater runoff treatment through electrocoagulation: antibiotic resistant bacteria removal and its transmission risks

Zuo

Zhang

Chen

2023

Environmental Technology

View full text Add to dashboard Cite

Development and Evaluation of Lamella Settlers Combined with Electrocoagulation for Treating Suspended Sediment

Cited by 3 publications

References 33 publications

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

Optimum Dosage and Product Selection Guidance for Flocculant Usage in Construction Stormwater Treatment

Stormwater runoff treatment through electrocoagulation: antibiotic resistant bacteria removal and its transmission risks

Contact Info

Product

Resources

About