Granulometric analysis to estimate influence of anionic surfactant on activated sludge structure

• Autorzy: Dereszewska A. , Tuszyńska A. , Cytawa S.

Identyfikatory

DOI

10.2428/ecea.2015.22(1)05

Warianty tytułu

PL

Zastosowanie analizy granulometrycznej do okreoelenia wp£ywu surfaktantu na strukturê osadu czynnego

• Języki publikacji: EN

Abstrakty

EN

The work concerns the evaluation of the possibility of using laser diffraction analyzer to determine changes in the distribution of sludge floc size in the presence of anionic surfactant. As a model of surfactant linear alkylbenzene sulphonate (LAS) was used. Different concentrations: 10, 100 and 200 mg/dm3 of LAS was applied. The granulometric analysis showed that the pure activated sludge was composed of particles with a size of 1 m to 2 mm. The largest and fastest changes in the distribution of sludge floc size after the addition of a surfactant at a concentration of 100 mg/dm3 were observed. The flocs with a diameter above 0.8 mm disappear and the average diameter over volume of particles decrease from 0.29 to 0.19 mm. Doubling the dose of surfactant causes the flocs aggregation. The sludge flocs capability for break-up and aggregation is not proportional to the concentration of LAS. Addition of LAS to the sludge results in decrease of the sludge volume index. This study showed that granulometric measurement may help to estimate an impact of chemical substances contained in wastewater on activated sludge.

PL

Praca dotyczy oceny możliwości wykorzystania analizatora dyfrakcji laserowej do określenia zmian w dystrybucji rozmiarów kłaczków osadu czynnego w obecności surfaktantu anionowego. Jako model surfaktantu, zastosowano liniowy alkilobenzenosulfonian sodu (LAS). W przeprowadzonych badaniach użyto różnych stężeń wyjściowych surfaktantu: 10, 100 i 200 mg/dm3. Analiza granulometryczna osadu wykazała, że rozmiar cząstek osadu mieści się w zakresie od 1 m do 2 mm. Największe i najszybsze zmiany w rozkładzie wielkości kłaczków osadu zaobserwowano po dodaniu surfaktantu o stężeniu 100 mg/dm3. Zanikły kłaczki o średnicy powyżej 0,8 mm, a średnia średnica kłaczków zmalała z 0,29 do 0,19 mm. Podwojenie dawki surfaktantu powoduje agregację kłaczków. Stopień rozdrobnienia bądź aglomeracji kłaczków pod wpływem LAS nie jest wprost proporcjonalny do stężenia surfaktantu. Dodatek LAS do osadu czynnego skutkuje spadkiem indeksu wagowo-objętościowego Przeprowadzone badania wykazały, że analiza granulometryczna może być stosowana jako metoda ułatwiająca oszacowanie wpływu związków chemicznych zawartych w ściekach na osad czynny.

Słowa kluczowe

EN

laser diffraction method; activated sludge; floc size distribution; anionic surfactant

PL

metoda dyfrakcji laserowej; osad czynny; rozkład rozmiaru kłaczków; surfaktant

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. A
• Rocznik: 2015
• Tom: Vol. 22, nr 1
• Strony: 51--61
• Opis fizyczny: Bibliogr. 31 poz., wykr., tab.

Twórcy

autor

Dereszewska A.

• Department of Chemistry and Industrial Commodity Science, Gdynia Maritime University, ul. Morska 83, 81–225 Gdynia, Poland, phone: [phone], fax: [phone]

autor

Tuszyńska A.

• Department of Sanitary Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80–233 Gdańsk, Poland, phone: [phone], fax: [phone]

autor

Cytawa S.

• Wastewater Treatment Plant „Swarzewo”, ul. Władysławowska 84, 84–120 Władysławowo, Poland, phone: [phone], fax: [phone]

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