The application of ultrasounds in oily wastewater pre-treatment

• Autorzy: Łobos-Moysa E.

Identyfikatory

DOI

10.24425/118178

Warianty tytułu

PL

Zastosowanie dezintegracji ultradźwiękowej do podczyszczania ścieków zaolejonych

• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to determine the impact of various methods of oil mixing with wastewater on properties of synthetic municipal wastewater containing edible oil (SMW+0.02% m/v rapeseed oil). The study was carried out in 3L glass, cylindrical reactors to which SMW+0.02% were introduced. Various methods of its mixing with water were applied: mechanical mixing (SMW+0.02%+mixing) and sonication (SMW+0.02%+ultrasounds). The wastewater was sonicated at 35 kHz for 30 min. The constant temperature conditions were maintained during the experiment for each mixing method (15°C, 20°C and 30°C). The analysis of parameters (pH, COD, BOD5 and long chain free fatty acids concentration) of raw wastewater and after 2, 4, 6, 24, 48 and 72 hours of inoculation was performed to determine the effect of mixing method. The most significant changes in wastewater chemical parameters after the introduction of the oil were observed in the case of COD. For SMW+0.02%+ mixing a slow increase in COD within 24 hours of the process was observed. In the case of SMW+0.02%+ultrasounds the increase and the decrease of COD value were observed in reference to the initial value. The changes in acids concentrations observed in reactors with SMW+0.02%+ultrasounds were referred to the ones observed in reactors with SMW+0.02%+mixing but changes were more intense in the first reactor. The use of ultrasounds in pre-treatment of wastewater resulted in the intense appearance of palmitic acid for 6 hours. Regardless of the emulsion formation method (mixing or ultrasounds), the concentration of oleic acid and linoleic acid was reduced. The biggest changes in free fatty acids concentration were observed for palmitic, oleic and linoleic acids after 24 hours.

PL

Celem badań było określenie wpływu sposobu mieszania oleju ze ściekami na właściwości syntetycznych ścieków komunalnych zawierających olej jadalny (SŚK+0,02% w/v oleju rzepakowego). Badania były prowadzone w szklanych reaktorach o objętości 3 litrów, do których wprowadzano ścieki SŚK+0,02%. Zastosowano różne metody mieszania: mechaniczne mieszanie (SŚK+0,02%+mieszanie) oraz dezintegrację ultradźwiękową (SŚK+0,02%+ultradźwięki). Ścieki były poddane dezintegracji ultradźwiękowej z częstotliwością 35 kHz przez 30 minut. Podczas badań utrzymywano stałą temperaturę (15°C, 20°C oraz 30°C). W celu określenia efektywności metody mieszania, ścieki surowe oraz oczyszczone ‒ po 2, 4, 6, 24, 48 i 72 godzinach inkubowania poddano analizie (pH, ChZT, BZT5, zawartości długołańcuchowych kwasów tłuszczowych). Najbardziej istotne zmiany w parametrach ścieków po dodaniu oleju obserwowano dla wskaźnika ChZT. W przypadku ścieków SŚK+0,02%+mieszanie obserwowano powolny wzrost ChZT w ciągu 24 godzin. W przypadku SŚK+0,02%+ultradźwięki stwierdzono wzrost i następnie spadek ChZT. Zmiany stężenia kwasów obserwowane w reaktorach zawierających SŚK+0,02%+ultradźwięki były podobne do zmian w reaktora z SŚK+0,02%+mieszanie, przy czym bardziej intensywne zmiany były w pierwszym przypadku. Zastosowanie dezintegracji ultradźwiękowej do podczyszczania ścieków skutkowało intensywnym pojawieniem się kwasu palmitynowego w pierwszych 6-ciu godzinach. Niezależnie od sposobu mieszania (mechaniczne mieszanie lub dezintegracja ultradźwiękowa) stężenie kwasów oleinowego i linolowego malało. Największe zmiany w stężeniu wolnych kwasów tłuszczowych obserwowano dla kwasów: palmitynowego, oleinowego i linolowego po 24 godzinach.

Słowa kluczowe

EN

wastewater; fatty acids; biodegradation; ultrasounds; oil

PL

ścieki; kwas tłuszczowy; biodegradacja; ultradźwięki; olej

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2018
• Tom: Vol. 44, no. 1
• Strony: 24--32
• Opis fizyczny: Bibliogr. 37 poz., tab., wykr.

Twórcy

autor

Łobos-Moysa E.

• Silesian University of Technology, Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).