Suspended particles in wastewater: their optical, sedimentation and acoustical characterization and modeling

Pallarès, Anne; François, Pierre; Pons, Marie‐Noëlle; Schmitt, Philippe

doi:10.2166/wst.2011.042

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Kaolin powder (Sigma-Aldrich), with an ovoid shape of mean diameter 5 µm, corresponds to the fine mineral particle type. Wheat starch (S5127—Starch wheat, Sigma Aldrich) is a good surrogate for the organic fraction [ 20 ]. It is of ovoid shape with a mean diameter of 18 µm as for kieselguhr particles.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Time Resolved Optical Turbidity Measurements for Water Monitoring to Standard Real-Time Techniques

Pallarès

Schmitt

Uhring

2021

Sensors

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Environmental water monitoring requires the estimation of the suspended solids load. In this paper, we compare the concentration range accessible through three different techniques: optical turbidity, acoustic backscattering and the newly in-lab developed time resolved optical turbidity. We focus on their comparison on measurements made in the laboratory on water suspensions of known particles and concentrations. We used laboratory grade kieselguhr, wheat starch and kaolin as suspended solid surrogates. The explored concentration domains are the ones, for the total suspended solid load, commonly encountered in wastewater and rivers in standard (less than 1 g/L to a few g/L) or extreme conditions such as floods or storm events (up to several dozen g/L). Regarding the operable concentration domain, the time resolved optical turbidity shows a clear advantage upon the other methods, whatever the kind of particle is.

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Section: Methodsmentioning

confidence: 99%

Comparison of Time Resolved Optical Turbidity Measurements for Water Monitoring to Standard Real-Time Techniques

Pallarès

Schmitt

Uhring

2021

Sensors

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“…Velocity field measurements are performed with an ultrasonic profiler based on pulse pair technique using a combination of two ultra-sonic transducers (Pallares et al (2011)) (cf. Fig.…”

Section: Velocity Measurement Techniquementioning

confidence: 99%

An experiment of a hydropower conversion system based on vortex-induced vibrations in a confined channel

Dellinger¹,

François²,

Lefebure³

et al. 2018

Renewable Energy

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A hydropower conversion system based on vortex-induced vibrations is investigated experimentally. It consists in a cylinder immerged in a low-velocity flow in a channel (under 1 m/s), wich is linked to a variable stiffness spring, so that the natural frequency of the system might be controlled. Current studies report investigations on marine applications. Although rivers or channels constitute a strong energy potential, they are not exploited enough. In this paper, we will investigate the feasiblity of such a system implantation in a confined flow in a channel, with important edge effects. We propose a study of the effects of a confined flow on the efficiency of the system. We will highlight feasible improvements, particularly through automatic control strategies (generator behaviour, system's natural frequency). Moreover, we show the strong influence of confinement on the flow topology through velocity field measurements using pulse-pair method.

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Pathogen and Particle Associations in Wastewater

Chahal

Akker

Young

et al. 2016

Advances in Applied Microbiology

140

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Disinfection guidelines exist for pathogen inactivation in potable water and recycled water, but wastewater with high numbers of particles can be more difficult to disinfect, making compliance with the guidelines problematic. Disinfection guidelines specify that drinking water with turbidity ≥1 Nephelometric Turbidity Units (NTU) is not suitable for disinfection and therefore not fit for purpose. Treated wastewater typically has higher concentrations of particles (1-10NTU for secondary treated effluent). Two processes widely used for disinfecting wastewater are chlorination and ultraviolet radiation. In both cases, particles in wastewater can interfere with disinfection and can significantly increase treatment costs by increasing operational expenditure (chemical demand, power consumption) or infrastructure costs by requiring additional treatment processes to achieve the required levels of pathogen inactivation. Many microorganisms (viruses, bacteria, protozoans) associate with particles, which can allow them to survive disinfection processes and cause a health hazard. Improved understanding of this association will enable development of cost-effective treatment, which will become increasingly important as indirect and direct potable reuse of wastewater becomes more widespread in both developed and developing countries. This review provides an overview of wastewater and associated treatment processes, the pathogens in wastewater, the nature of particles in wastewater and how they interact with pathogens, and how particles can impact disinfection processes.

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Suspended particles in wastewater: their optical, sedimentation and acoustical characterization and modeling

Cited by 7 publications

References 10 publications

Comparison of Time Resolved Optical Turbidity Measurements for Water Monitoring to Standard Real-Time Techniques

Comparison of Time Resolved Optical Turbidity Measurements for Water Monitoring to Standard Real-Time Techniques

An experiment of a hydropower conversion system based on vortex-induced vibrations in a confined channel

Pathogen and Particle Associations in Wastewater

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