A Review on Rotary Generators of Hydrodynamic Cavitation for Wastewater Treatment and Enhancement of Anaerobic Digestion Process

Blagojevič, Marko; Rak, Gašper; Bizjan, Benjamin; Repinc, Sabina Kolbl

doi:10.3390/pr11020514

Cited by 6 publications

(2 citation statements)

References 124 publications

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“…Cavitation is the process of formation, growth and subsequent implosive collapse of vapour bubbles, which is a consequence of a phase change caused by a significant pressure drop at constant temperature [55]. This dynamic transition from the liquid to the gaseous state, measured in milliseconds, can occur when the initial liquid temperature is between the triple point temperature and the critical temperature, and the pressure at this temperature is greater than the vapourisation pressure [56]. When the walls of a cavitation bubble burst, which happens during a collision, large amounts of energy are released.…”

Section: Introductionmentioning

confidence: 99%

The Use of Hydrodynamic Cavitation to Improve the Anaerobic Digestion of Waste from Dairy Cattle Farming—From Laboratory Tests to Large-Scale Agricultural Biogas Plants

Dębowski,

Kazimierowicz,

Nowicka

et al. 2024

Energies

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There is a need to find methods to intensify the anaerobic digestion process. One possibility is the use of pretreatment techniques. Many laboratory tests confirm their effectiveness, but in most cases, there is no verification work carried out on industrial plants. A reliable and complete evaluation of new solutions can only be carried out in plants that reflect operating conditions at a higher readiness technological level. This has a direct impact on the scientific value and, above all, on the high application value of innovative technologies. The aim of our research carried out under laboratory conditions and on a large scale was to determine the technological and energy efficiency of the use of hydrodynamic cavitation in the pretreatment of a waste mixture from dairy farms. It has been shown that hydrodynamic cavitation significantly increases the concentration of organic compounds in the dissolved phase. In the most effective variants, the increase in the content of these indicators was over 90% for both COD and TOC. The degree of solubilisation achieved was 49 ± 2.6% for COD and almost 52 ± 4.4% for TOC. Under laboratory conditions, the highest effects of anaerobic digestion were achieved after 10 min of pretreatment. The amount of biogas was, on average, 367 ± 18 mL/gCOD, and the amount of methane was 233 ± 13 mL/gCOD. Further large-scale optimisation trials showed that after 8 min of hydrodynamic cavitation, the biogas yield was 327 ± 8 L/kgCOD with a CH4 content of 62.9 ± 1.9%. With this variant, the net energy yield was 66.4 ± 2.6 kWh/day, a value that was 13.9% higher than the original variant with 10 min of disintegration and 3.1% higher than the variant without pretreatment.

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Section: Introductionmentioning

confidence: 99%

The Use of Hydrodynamic Cavitation to Improve the Anaerobic Digestion of Waste from Dairy Cattle Farming—From Laboratory Tests to Large-Scale Agricultural Biogas Plants

Dębowski,

Kazimierowicz,

Nowicka

et al. 2024

Energies

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“…In the RGHCs developed so far, different cavitation generation units (CGUs) have been used for generating cavitation conditions, namely: high speed homogenizers and batch reactors, indentation type, serrated type, pinned discs and hybrid variants [28] . In this study, the effect of laboratory scale Pinned Disc RGHC on sludge rheological properties is investigated.…”

Section: Introductionmentioning

confidence: 99%