scholarly journals Assessment of the papermaking potential of processed Miscanthus × giganteus stalks using alkaline pre-treatment and hydrodynamic cavitation for delignification

2021 ◽  
Vol 72 ◽  
pp. 105462
Author(s):  
Dimitrios Tsalagkas ◽  
Zoltán Börcsök ◽  
Zoltán Pásztory ◽  
Parag Gogate ◽  
Levente Csóka
Keyword(s):  
Hydrodynamic Cavitation ◽  
Miscanthus Giganteus ◽  
Pre Treatment

Enhanced microfibrillation of Miscanthus × giganteus biomass by binary-enzymes pre-treatment

2022 ◽  
Vol 177 ◽  
pp. 114537
Author(s):  
Singam Suranjoy Singh ◽  
Loong-Tak Lim ◽  
Annamalai Manickavasagan
Keyword(s):  
Miscanthus Giganteus ◽  
Pre Treatment

scholarly journals Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2483 ◽  
Author(s):  
Agnieszka Garlicka ◽  
Monika Zubrowska-Sudol ◽  
Katarzyna Umiejewska ◽  
Otton Roubinek ◽  
Jacek Palige ◽  
...  
Keyword(s):  
Methane Production ◽  
Pilot Scale ◽  
Hydrodynamic Cavitation ◽  
Excess Sludge ◽  
Maximum Increase ◽  
Primary Sludge ◽  
Sludge Flocs ◽  
Pre Treatment ◽  
Flocculation Process ◽  
Different Levels

The main purpose of this study was the assessment of the possibility of increasing the production of biogas through the pre-treatment of thickened excess sludge (TES) by means of the hydrodynamic cavitation (HC) conducted at different levels of energy density (EL) i.e., 70, 140 and 210 kJ/L. The experiments were performed on a pilot scale, and a mixture of thickened primary sludge (TPS) and TES was used as digester feed. The results documented that an important parameter determining the possibility of obtaining an enhanced methane production is the value of energy input in the HC process. This parameter determines the changes occurring in sludge as a result of disintegration (i.e., sludge floc deagglomeration, lysis of cells, re-flocculation process and the related release of compounds susceptible to biodegradation from sludge flocs). The maximum increase in methane yield (MY) of 152% was obtained for EL = 140 kJ/L. In this case, HC mainly caused sludge floc deagglomeration. An increase in MY was also recorded when TES was subject to the disintegration process at EL = 210 kJ/L. However, it was 4.3 times lower than that observed for EL = 140 kJ/L. Pre-treatment of TES at EL = 70 kJ/L did not contribute to an increase in methane production.

High-pressure jet-induced hydrodynamic cavitation as a pre-treatment step for avoiding cyanobacterial contamination during water purification

2020 ◽  
Vol 255 ◽  
pp. 109862 ◽  
Author(s):  
Štěpán Zezulka ◽  
Eliška Maršálková ◽  
František Pochylý ◽  
Pavel Rudolf ◽  
Martin Hudec ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Purification ◽  
Hydrodynamic Cavitation ◽  
Pre Treatment ◽  
Treatment Step

scholarly journals Pre-treatment of biomasses using magnetised sulfonic acid catalysts

2017 ◽  
Vol 48 (2) ◽  
pp. 117 ◽  
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Sunkyu Park ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Panicum Virgatum ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Miscanthus Giganteus ◽  
Panicum Virgatum L ◽  
Pre Treatment

There is a significant interest in employing solid acid catalysts for pre-treatment of biomasses for subsequent hydrolysis into sugars, because solid acid catalysts facilitate reusability, high activity, and easier separation. Hence the present research investigated pretreatment of four lignocellulosic biomasses, namely Switchgrass (Panicum virgatum L ‘Alamo’), Gamagrass (Tripsacum dactyloides), Miscanthus (Miscanthus × giganteus) and Triticale hay (Triticale hexaploide Lart.) at 90°C for 2 h using three carbon-supported sulfonic acid catalysts. The catalysts were synthesized via impregnating p-Toluenesulfonic acid on carbon (regular) and further impregnated with iron nitrate via two methods to obtain magnetic A and magnetic B catalysts. When tested as pre-treatment agents, a maximum total lignin reduction of 17.73±0.63% was observed for Triticale hay treated with magnetic A catalyst. Furthermore, maximum glucose yield after enzymatic hydrolysis was observed to be 203.47±5.09 mg g–1 (conversion of 65.07±1.63%) from Switchgrass treated with magnetic A catalyst. When reusability of magnetised catalysts were tested, it was observed that magnetic A catalyst was consistent for Gamagrass, Miscanthus × Giganteus and Triticale hay, while magnetic B catalyst was found to maintain consistent yield for switchgrass feedstock. Our results suggested that magnetised solid acid catalyst could pre-treat various biomass stocks and also can potentially reduce the use of harsh chemicals and make bioenergy processes environment friendly.

scholarly journals Hydrodynamic cavitation-assisted continuous pre-treatment of sugarcane bagasse for ethanol production: Effects of geometric parameters of the cavitation device

2020 ◽  
Vol 63 ◽  
pp. 104931 ◽  
Author(s):  
Ruly Terán Hilares ◽  
Rafaela Medeiros Dionízio ◽  
Salvador Sánchez Muñoz ◽  
Carina Aline Prado ◽  
Ruy de Sousa Júnior ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Sugarcane Bagasse ◽  
Geometric Parameters ◽  
Hydrodynamic Cavitation ◽  
Pre Treatment ◽  
Production Effects

scholarly journals Removal of Microcystis aeruginosa through the Combined Effect of Plasma Discharge and Hydrodynamic Cavitation

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 8 ◽  
Author(s):  
Blahoslav Maršálek ◽  
Eliška Maršálková ◽  
Klára Odehnalová ◽  
František Pochylý ◽  
Pavel Rudolf ◽  
...  
Keyword(s):  
Drinking Water ◽  
Drinking Water Treatment ◽  
Plasma Discharge ◽  
Hydrodynamic Cavitation ◽  
Raw Water ◽  
Novel Technology ◽  
Drinking Water Production ◽  
Pre Treatment ◽  
Cyanobacterial Biomass ◽  
Water Blooms

Cyanobacterial water blooms represent toxicological, ecological and technological problems around the globe. When present in raw water used for drinking water production, one of the best strategies is to remove the cyanobacterial biomass gently before treatment, avoiding cell destruction and cyanotoxins release. This paper presents a new method for the removal of cyanobacterial biomass during drinking water pre-treatment that combines hydrodynamic cavitation with cold plasma discharge. Cavitation produces press stress that causes Microcystis gas vesicles to collapse. The cyanobacteria then sink, allowing for removal by sedimentation. The cyanobacteria showed no signs of revitalisation, even after seven days under optimal conditions with nutrient enrichment, as photosynthetic activity is negatively affected by hydrogen peroxide produced by plasma burnt in the cavitation cloud. Using this method, cyanobacteria can be removed in a single treatment, with no increase in microcystin concentration. This novel technology appears to be highly promising for continual treatment of raw water inflow in drinking water treatment plants and will also be of interest to those wishing to treat surface waters without the use of algaecides.

scholarly journals Considerations of Impact of Venturi Effect on Mesophilic Digestion

2015 ◽  
Vol 22 (4) ◽  
pp. 645-658 ◽  
Author(s):  
Alicja Machnicka ◽  
Klaudiusz Grübel ◽  
Kryspin Mirota
Keyword(s):  
Biogas Production ◽  
Oxygen Demand ◽  
Internal Flow ◽  
Analytical Investigation ◽  
Hydrodynamic Cavitation ◽  
Cfd Analysis ◽  
Venturi Effect ◽  
Mesophilic Digestion ◽  
Pre Treatment ◽  
Fluid Design

AbstractHydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to investigate the effect of hydrodynamic cavitation on disintegration of activated sludge foam and mesophilic fermentation. Cavitation was generated in standard Venturi tube with the diameter ratioβ=d0/d1= 0.30, working atσ= 0.249. Detailed Computational Fluid Design (CFD) analysis in class ofk-∈model of internal flow has been presented. Obtained analytical investigation results confirmed the effect of strong disruption of microorganism cells and release of free organic substance into the liquid phase. After a short (30 minutes) pre-treatment, chemical oxygen demand increased by 8.63 times while Müller’s disintegration degree was 50%. Moreover, undertaken mesophilic digestion trials brought significant improvement in biogas production.

scholarly journals ANN based modelling of hydrodynamic cavitation processes: Biomass pre-treatment and wastewater treatment

2021 ◽  
Vol 72 ◽  
pp. 105428
Author(s):  
Nanda V. Ranade ◽  
Sanjay Nagarajan ◽  
Varaha Sarvothaman ◽  
Vivek V. Ranade
Keyword(s):  
Wastewater Treatment ◽  
Hydrodynamic Cavitation ◽  
Pre Treatment

Optimization of the Hydrodynamic Sludge Pre-Treatment System with Venturi Tubes

2010 ◽  
Vol 5 (2) ◽  
Author(s):  
J. W. Maeng ◽  
E. Y. Lee ◽  
J. H. Bae
Keyword(s):  
Energy Consumption ◽  
Operating Cost ◽  
Operating Conditions ◽  
Hydrodynamic Cavitation ◽  
Optimum Number ◽  
Discharge Mode ◽  
Sludge Pretreatment ◽  
In Series ◽  
Pre Treatment ◽  
Anaerobic Digestibility

Most of the sludge pre-treatment methods to improve the anaerobic digestibility are not adopted in the fields because of low economical efficiency. The venturi cavitation system (VCS) using hydrodynamic cavitation is simple in design and operates with a low operating cost compared to most of the current sludge pretreatment methods. Research was conducted to investigate the optimum design and operating conditions of the VCS for pretreatment of waste activated sludge. The experimental results indicate that the optimum number of venturis in series is three (three-venturi units). The suction mode operation of the pump used yielded 1.6 times higher solubilization efficiency per unit of energy consumption than the discharge mode. Variations in the size of the venturi throat diameter with the three-venturi unit did not affect solubilization efficiency. Also, a parallel installation with two three-venturi units yielded 30% higher solubilization efficiency per unit of energy consumption than did a single three-venturi unit. With the parallel venturi unit, the solubilization efficiency was 5.6 mg △SCOD/g TS/kWh, which is higher than previously reported values.

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