Monitoring particulate composition changes during the flocculation process using polarized light scattering

Yan, Cheng; Li, Jiajin; Zhou, Huaqiang; Wang, Hongjian; Zhuo, Zepeng; Wang, Qiang; Yan, Chongling; Ma, Hui

doi:10.1364/ao.440400

Cited by 11 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Honestly, it can be expected that the more specialized instruments may give more accurate information about the phytoplankton and the sediments, which may be helpful for our future works. Due to the bulk measurement, the acquisition of chlorophyll and ABI is affected by hydro‐climatic conditions (Kim et al 2020; Chen et al 2021 a , b ). By comparison, our prototype can directly measure and identify the individual particles, and then explicitly obtain the number of phytoplankton and sediments in water over a period of time, and thus unambiguously get the relative proportion of different types of particles.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, polarization measurement can be easily adapted into the current scattering measurement system, by adding the polarization state generator (PSG) and the polarization state analyzer (PSA). And the individual measurement of the particles has the advantage to explicitly obtain the particulate compositions in suspension (Chen et al 2021a(Chen et al , 2021b, and also the accurate acquisition of the polarization state of the scattered light is necessary to probe the particles (Liao and Ma 2015). Due to diverse types of the marine particles, the accurately measuring of the polarization state of light scattered by the individual particles may help to recognize the particulate categories.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Deng,

Wang,

Guo

et al. 2023

Limnology & Ocean Methods

Self Cite

View full text Add to dashboard Cite

Classification of suspended particles characterizes the composition of seawater, which helps the interpretation of remote sensing data and promotes the researches of the matter exchanges in ocean processes. In this article, an in situ prototype based on polarized light scattering is introduced, and its ability to classify the suspended particles is demonstrated. The experimental results show that the prototype can classify the sediments, microplastics, and phytoplankton in seawater with an accuracy larger than 85%, and further calculate their relative proportion in water. In the summer and winter of 2020, the prototype was deployed three times in Daya Bay and lasted for dozens of hours each time, along with the additional commercial sensors, that is, Environment X Observation (EXO) and Acoustic Doppler Current Profiler (ADCP). The chlorophyll content measured by EXO and the acoustic backscatter intensity measured by ADCP are respectively related to the number of algal cells and sediments in the water, which helps to interpret the data of the prototype. The results of field data show that the prototype can effectively classify phytoplankton and sediment particles in seawater and monitor their temporal variations. Besides, the retrieved information of the suspended particles is consistent with the analysis from the flow dynamics and season variations in Daya Bay. These results indicate the ability of this prototype to classify the suspended particles in seawater, which promises its potential contribution to particulate oceanography in the future.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Deng,

Wang,

Guo

et al. 2023

Limnology & Ocean Methods

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, we also consider the emerging demand for the in situ detection of the suspended particle in aquatic environments [19][20][21]. Therefore, we propose the shielding strategy that the propagation path between the W1 and focus point is sealed and filled with distilled water, and the illuminating light and scattered light pass by a K9 glass window (W3), as shown in Figure 7.…”

Section: Shielding Strategymentioning

confidence: 99%

Convergence of illuminating beams suffering from scattering during the individual measurement of suspended particles

Deng

Guo

et al. 2022

Front. Phys.

Self Cite

View full text Add to dashboard Cite

The convergent illuminating beam is the key factor during the individual measurement of suspended particles in aquatic suspensions. When the illuminating beam propagates in the suspension, the particle scattering in the optical path may destroy the convergence of the illuminating beam, especially in suspensions with a high particle concentration. In this paper, using the Monte Carlo simulation, the convergence of the illuminating beam is investigated by changing the physical properties of particles, such as size and concentration, and the optical path length of the illuminating beam. A dimensionless quantity, as the product of the scattering coefficient of suspension and the optical path length, is found to determine the achievement of the convergent beam. Moreover, an individual measurement setup based on the convergence of the illuminating beam is used to measure polystyrene microspheres with different concentrations. The experiment results are consistent with those of the simulations. Furthermore, improvement strategies are proposed and proved to effectively keep the convergence of the illuminating beam in turbid water. The results in this work can provide clues for designing a similar optical apparatus used in aquatic environment monitoring.

show abstract

“…Several studies focusing on the design of horizontally baffled flocculators existed in literature while design guidance for hydraulic flocculators has been limited 18 . Chen, Liao 19 used an experimental setup based on polarized light scattering to measure the polarization states of the scattered light of the individual particles. Feng, Zhang 20 simulated the vortex distribution and vorticity in the flow field of the same wave folded-plate flocculator and the opposite wave folded-plate flocculator by Ansys-Fluent.…”

mentioning

confidence: 99%

PIV and CFD investigation of paddle flocculation hydrodynamics at low rotational speeds

Chatila

Danageuzian

2022

Sci Rep

View full text Add to dashboard Cite

In this study, flocculation hydrodynamics were evaluated by investigating the velocity field of turbulent flow experimentally and numerically, in a laboratory scale paddle flocculator. Turbulence that either promotes the particle aggregation or the breakage of flocs is complicated and has been considered and compared in this work using two turbulence models; namely, the SST k–ω and the IDDES. Results showed that IDDES provided very slight improvement as compared to SST k–ω, yielding the latter sufficient in accurately simulating the flow inside the paddle flocculator. A Goodness-of-Fit evaluation was adopted to study the convergence between PIV and CFD results, and to compare the results of the used CFD turbulence models. The study focused, as well, on the quantification of the slippage factor k, as 0.18 at low rotational speeds of 3 rpm and 4 rpm, and compared to conventional typical value of 0.25. This reduction of k from 0.25 to 0.18 yields around 27–30% increase in the power imparted to the fluid, and about 14% increase in velocity gradient (G). This implies that more mixing is provided than expected, and therefore, less energy is input and thus the electric consumption for the flocculation unit at a drinking water treatment plant could be potentially decreased.

show abstract

Monitoring particulate composition changes during the flocculation process using polarized light scattering

Cited by 11 publications

References 29 publications

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Convergence of illuminating beams suffering from scattering during the individual measurement of suspended particles

PIV and CFD investigation of paddle flocculation hydrodynamics at low rotational speeds

Contact Info

Product

Resources

About