Post-Digestion Liquor Treatment in the Method Combining Chemical Precipitation with Reverse Osmosis

• Autorzy: Kuglarz M. , Grübel K. , Bohdziewicz J.

Identyfikatory

DOI

10.2478/aep-2014-0030

• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to develop an effective treatment of post-digestion liquors highly-loaded with biogenic and organic substances. The scope of the research project encompassed: mesophilic anaerobic digestion of waste activated sludge (WAS) as well as the treatment of post-digestion liquors, coming from the most appropriate HRT value of 25 days, in the process of ammonium magnesium phosphate (struvite) precipitation targeted at ammonia nitrogen binding and a subsequent reverse osmosis (RO) process. It was established that the method combining chemical precipitation and high-pressure filtration ensures a high degree of contaminants removal allowing for a direct release of treated liquors into the natural reservoir. However, in order to decrease the residual NH₄⁺ concentration (6.1 mg NH₄⁺/dm³) in the purified post-digestion liquors below the level allowing for a direct release to the natural reservoir, it turned out to be necessary to apply increased molar ratio of magnesium and phosphates (Mg:NH₄⁺: PO₄³- = 1.5:1:1.5).

PL

Celem badań przedstawionych w artykule było opracowanie efektywnej metody oczyszczania wysoko obciążonych wód pofermentacyjnych, związkami biogennymi oraz organicznymi. Zakres przeprowadzonych badań obejmował mezofilową fermentację nadmiernych osadów czynnych oraz oczyszczanie powstałych wód pofermentacyjnych. Wody pochodzące z fermentacji osadów prowadzonej w warunkach uznanych za najkorzystniejsze (HRT = 25 dni) poddano oczyszczeniu z zastosowaniem procesu strącania fosforanu amonowo-magnezowego (struwitu) oraz wysokociśnieniowej filtracji membranowej (RO). Na podstawie przeprowadzonych badań ustalono, że oczyszczanie wód pofermentacyjnych w procesie łączącym strącanie fosforanu amonowo- magnezowego z membranową filtracją wysokociśnieniową jest metodą efektywną, zapewniającą wysoki stopień usunięcia ładunku zanieczyszczeń. Jakkolwiek, zastosowanie 50% nadmiaru jonów magnezowych i fosforanowych (Mg:NH₄⁺PO₄^3-- =1.5:1:1.5) podczas strącania struwitu okazało się niezbędne w celu obniżenia stężenia azotu amonowego (6.1 mg NH₄⁺/dm³) poniżej poziomu pozwalającego na bezpośrednie odprowadzenie oczyszczonych wód do odbiornika naturalnego.

Słowa kluczowe

EN

anaerobic digestion; biogas; struvite; reverse osmosis; waste activated sludge

PL

fermentacja beztlenowa; biogaz; struwit; odwrócona osmoza; osad czynny; oczyszczanie ścieków

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2014
• Tom: Vol. 40, no. 3
• Strony: 29--42
• Opis fizyczny: Bibliogr. 45 poz., rys., tab.

Twórcy

autor

Kuglarz M.

• University of Bielsko-Biała, Institute of Engineering and Environmental Protection, Willowa 2, 43-309 Bielsko-Biała, Poland

autor

Grübel K.

• University of Bielsko-Biała, Institute of Engineering and Environmental Protection, Willowa 2, 43-309 Bielsko-Biała, Poland

autor

Bohdziewicz J.

• Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego 20, 44-100 Gliwice, Poland

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