Effects of various rotational speeds of hydrodynamic disintegrator on carbon, nutrient, and energy recovery from sewage sludge

Walczak, Justyna; Dzido, Aleksandra; Jankowska, H.; Krawczyk, Piotr; Żubrowska-Sudoł, Monika

doi:10.1016/j.watres.2023.120365

Cited by 2 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changing the status of washed mineral waste from mechanical wastewater treatment to a by-product for construction applications could become another example of implementing a circular economy in Poland [7]. Moreover, such an action proves once again that wastewater treatment plants are facilities where the assumptions of the circular economy model can be systematically implemented [8], for example, by recovering resources such as nutrients, water and energy from wastewater [9], or recovering organic compounds, nutrients and energy from sewage sludge generated in wastewater treatment processes [10], or even recycling ashes from sewage sludge combustion and using them as a by-product, such as in road embankments [11].…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Properties of Washed Mineral Waste from Grit Chambers and Its Potential Use as Soil Backfill and Road Embankment Materials

Kostrzewa,

Popielski,

Dąbska

2024

Buildings

View full text Add to dashboard Cite

The current practice of managing washed mineral waste from grit chambers under national legislation focuses primarily on its disposal, generating high costs for wastewater treatment plants. Other ways are being sought to enable its use, especially as a by-product in the construction industry. This paper presents the results of laboratory tests of the geotechnical, physical and mechanical parameters of washed mineral waste from grit chambers. Research samples were taken from the largest, in terms of maximum daily capacity, wastewater treatment plant “Czajka” in Poland. The washed mineral waste was characterized by organic matter content (0.36% by Tyurin’s method or 1.04% by the loss on ignition method), fraction content (sand fraction was at least 90%; it corresponds in grain size to uniform-grained medium sand), specific density of solids (2.55 g/cm3), dry density, void ratio and porosity corresponding to the state of the loosest and densest possible composition of soil grains and particles (1.54 g/cm3, 0.656, 0.396 and 1.87 g/cm3, 0.364, 0.267, respectively), sand equivalent (93), passive capillarity (0.20 m), maximum dry density (1.78 g/cm3), optimal moisture content (11.23%), degree of saturation after compaction (0.66) and permeability coefficient (6.22·10−3cm/s). The mechanical parameters determined included internal friction angle (35.5°) and apparent cohesion (14.27 kPa). The possibility of using washed mineral waste as soil for the backfill of installation trenches, abutments and retaining structures, as well as road embankment material, was evaluated considering current standards and legislation. It was found that the values of the determined parameters of washed mineral waste coincide with the values of the geotechnical parameters of sand, and there is a possibility of using this waste as a material in the indicated applications after fulfilling the appropriate conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Geotechnical Properties of Washed Mineral Waste from Grit Chambers and Its Potential Use as Soil Backfill and Road Embankment Materials

Kostrzewa,

Popielski,

Dąbska

2024

Buildings

View full text Add to dashboard Cite

show abstract

“…The application fields of HC are numerous and extensive, and the following will only take sludge treatment in the environment as an example. During cavitation, mechanical shear stress [24], temperature [25], and oxidizing effects of free radicals [26] can result in the breakdown of sludge aggregates and the subsequent liberation of both intracellular and extracellular substances. Using it reduced the average particle size [25], enhanced dewatering [17,27], and increased the biological treatment potential of sludge [28].…”

Section: Introductionmentioning

confidence: 99%

“…During cavitation, mechanical shear stress [24], temperature [25], and oxidizing effects of free radicals [26] can result in the breakdown of sludge aggregates and the subsequent liberation of both intracellular and extracellular substances. Using it reduced the average particle size [25], enhanced dewatering [17,27], and increased the biological treatment potential of sludge [28]. However, research on using HC for FW treatment has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Hydrodynamic Cavitation Pretreatment of Food Waste: Effect of Pressure Drop on the Cavitation Behavior

Zhou,

Zhong,

Zhu

2024

Processes

View full text Add to dashboard Cite

Hydrodynamic cavitation (HC) has a wide range of application scenarios. However, there are few studies on the HC treatment of food waste (FW). A Venturi device is designed and operated and plays a clear role in changing the characteristics of FW. The medium viscosity is often neglected when studying cavitation behavior by numerical simulations. We use the Herschel–Bulkley model to describe the viscosity curves of artificial FW samples obtained experimentally. RANS numerical simulation is carried out with a simplified 2D axisymmetric CFD-based model considering the non-Newtonian fluid properties. A numerical simulation study is carried out for FW (TS = 10.0 wt%) at pressure drop (ΔP = 0.05–0.4 MPa). The numerical simulation results show the variation of flow characteristics, viscosity, vapor volume, turbulent viscosity ratio, cavitation number, and pressure loss coefficient. With the increase in ΔP, the flow rate in the Venturi throat increases, and the average viscosity decreases. It reduces the inhibition effect of viscosity on cavitation. The position of incipient vacuoles at the moment of cavitation is constant and unrelated to the variation of ΔP. Under the effect of increasing ΔP, the average vapor volume fraction is increased, and the cavitation effect is enhanced; the cavitation number (σ) is decreased, and the cavitation potential is improved. A larger ΔP should be selected to increase the cavitation efficiency E of the device.

show abstract

Effects of various rotational speeds of hydrodynamic disintegrator on carbon, nutrient, and energy recovery from sewage sludge

Cited by 2 publications

References 31 publications

Geotechnical Properties of Washed Mineral Waste from Grit Chambers and Its Potential Use as Soil Backfill and Road Embankment Materials

Geotechnical Properties of Washed Mineral Waste from Grit Chambers and Its Potential Use as Soil Backfill and Road Embankment Materials

Numerical Study of Hydrodynamic Cavitation Pretreatment of Food Waste: Effect of Pressure Drop on the Cavitation Behavior

Contact Info

Product

Resources

About