Identyfikatory
Warianty tytułu
Badania wpływu warunków prowadzenia procesu dezintegracji ultradźwiękowej na zmiany charakterystyki fizykochemicznej osadów nadmiernych
Języki publikacji
Abstrakty
Ultrasonic disintegration, as a method of sludge pre-treatment (before the stabilization process), causes changes in their physicochemical characteristics. The aim of this study was to determine the influence of ultrasonic disintegration conditions (sonication) on the changes in the physicochemical characteristics of sonicated sludge, i.e. an increase in the content of organic substances in the supernatant, sludge dewaterability and flocs structure. Thickened and non-thickened excess sludge from the municipal wastewater treatment plant in Gliwice was disintegrated. The process was conducted, using a high-power disintegrator equipped with a lenticular horn. In order to determine the most favorable conditions, the sewage sludge was sonicated at a wave frequency of f=25 kHz (as a function of time), with a different samples volume (V1=0.5 and V2=1 L) and emitter position of 1 and the 2.5 cm from the bottom of the chamber in which the process was conducted. The disintegration of sewage sludge was carried out with a specifi c energy density (EV) in the range from 10 to 30 kWh/m3. The evaluation of the disintegration effects was based on changes in the physicochemical characteristics of the sludge and/or supernatant at the end of the process, expressed by commonly used and author’s disintegration indicators. The best results were obtained for the sludge disintegrated with a volume of V2=1 L and the emitter position of 2.5 cm from the bottom of the chamber. The study confi rms that in various operating conditions of ultrasonic disintegration, there is a possibility for obtaining different effects which may influence the course of anaerobic stabilization and quality of the final products of the process.
Dezintegracja ultradźwiękowa jako metoda wstępnej obróbki osadów ściekowych przed procesem stabilizacji, powoduje zmiany charakterystyki fizykochemicznej osadów ściekowych. Celem przeprowadzonych badań było określenie wpływu warunków prowadzenia dezintegracji ultradźwiękowej na zmiany charakterystyki fizykochemicznej nadźwiękawianych osadów, mianowicie: wzrost zawartości substancji organicznych w cieczy osadowej, podatność osadów na odwadnianie oraz stopień rozdrobnienia fazy stałej osadów (strukturę kłaczków osadu). Nadźwiękawianiu poddawano osady nadmierne niezagęszczone i zagęszczone, pochodzące z komunalnej oczyszczalni ścieków w Gliwicach. Proces prowadzono przy użyciu dezintegratora o wysokiej mocy, wyposażonego w głowicę soczewkową. W celu określenia najkorzystniejszych warunków prowadzenia procesu osady ściekowe poddawano nadźwiękawianiu falą o częstotliwości f=25 kHz w funkcji czasu, przy zmiennej geometrii w obszarze nadźwiękawiania (odległości emitera od dna komory, w którym nadźwiękawiano osady) i różnej objętości prób tj. V1=0,5 i V2=1 L, przy położeniu emitera kolejno 1 i 2,5 cm od dna naczynia, w którym nadźwiękawiano osady. Dezintegrację osadów prowadzono w określonym zakresie gęstości energii (EV), tj. od 10 do 30 kWh/m3. Oceny efektów dezintegracji dokonano w oparciu o zmiany charakterystyki fi zykochemicznej badanych osadów i/lub cieczy osadowych po zakończeniu procesu, wyrażonych przy pomocy powszechnie stosowanych oraz własnych wskaźników efektów dezintegracji. Najlepsze efekty dezintegracji uzyskano dla osadów o objętości V2=1 L i położeniu emitera w odległości 2,5 cm od dna naczynia, w którym prowadzono proces. Przeprowadzone badania potwierdzają, iż w różnych warunkach prowadzenia dezintegracji ultradźwiękowej osadów nadmiernych można uzyskać odmienne jego efekty, co może wpływać na przebieg stabilizacji beztlenowej osadów oraz jakość produktów końcowych tego procesu.
Czasopismo
Rocznik
Tom
Strony
19--26
Opis fizyczny
Bibliogr. 39 poz., fot., rys., tab., wykr.
Twórcy
autor
- Silesian University of Technology, Poland Faculty of Energy and Environmental Engineering Institute of Water and Wastewater Engineering
autor
- Silesian University of Technology, Poland Faculty of Energy and Environmental Engineering Institute of Water and Wastewater Engineering
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-8dc09431-0e2f-46dc-840d-cb382f8b39cc