The influence of electric current density on specific denitrification rate of and nitrogen removal rate in electrochemical and electrobiological rotating contactor

• Autorzy: Rodziewicz Joanna , Janczukowicz Wojciech , Mielcarek Artur , Bryszewski Kamil

Identyfikatory

DOI

10.24425/aep.2020.135761

Warianty tytułu

PL

Wpływ gęstości prądu elektrycznego na właściwą szybkość denitryfikacji i na szybkość usuwania azotu w elektrochemicznym i elektrobiologicznym złożu obrotowym

• Języki publikacji: EN

Abstrakty

EN

This study aimed to determine the influence of the electric current density on the rate of nitrogen compounds removal (r_N) and the specific rate of denitrification (r_D) in a rotating electrochemical disk contractor (RECDC) and a rotating electro-biological disk contactor (REBDC). In REBDC and RECDC, the cathode consisted of disks with immobilized biomass and disk, from which biofilm was periodically removed, respectively. An aluminum anode was mounted in contactor chambers. The study was conducted using synthetic wastewater with characteristics similar to wastewater from soilless cultivation of tomatoes. The first stage of the study determined r_N and r_D in the RECDC. The second stage determined r_N and r_D in the REBDC. Four hydraulic retention times (HRT) were tested: 4 h, 8 h, 12 h, and 24 h, with electric current densities of 0.63 A/m², 1.25 A/m², 2.50 A/m², 5.00 A/m², and 10.00 A/m². In RECDC, a linear dependency was observed between r_N and current density in the examined HRTs, whereas in REBDC, a logarithmic dependency was confirmed between r_N and current density. In both contactors, an exponential dependency was observed between r_D and current density. The specific rate of denitrification decreased when the current density and HRT were increased. The study showed that, in both contactors, the rate of total nitrogen removal increased when the current density was increased and the HRT was decreased.

PL

Celem pracy było określenie wpływu gęstości prądu na szybkość usuwania związków azotu (r_N) i na specyficzną szybkość procesu denitryfikacji (r_D) w elektrochemicznym tarczowym złożu obrotowym (RECDC) i elektrobiologicznym tarczowym złożu obrotowym (REBDC). W elektrochemicznym tarczowym złożu obrotowym (RECDC) i elektrobiologicznym tarczowym złożu obrotowym (REBDC) katodę stanowiły odpowiednio tarcze pokryte błoną biologiczną i tarcze z których okresowo usuwano błonę biologiczną. Aluminowa anoda była umieszczona w zbiornikach złoża. Badania przeprowadzono na ściekach o wskaźnikach fizykochemicznych podobnych do ścieków z bezglebowej uprawy pomidorów. W pierwszym etapie badań określono wartości r_N and r_D w RECDC podczas gdy w drugim w REBDC. Zastosowano cztery wartości hydraulicznego czasu zatrzymania (HRT): 4 h, 8 h, 12 h and 24 h dla następujących gęstości prądu: 0.63 A/m², 1.25 A/m², 2.50 A/m², 5.00 A/m² and 10.00 A/m2. W elektrochemicznym złożu zaobserwowano liniową zależność pomiędzy r_N i gęstością prądu, podczas gdy w złożu elektrobiologicznym zależność logarytmiczną. Dla obu złóż stwierdzono wykładniczą zależność pomiędzy r_D i gęstością prądu. Specyficzną szybkość procesu denitryfikacji malała wraz ze wzrostem gęstości prądu i HRT. Badania pokazały, że w obu złożach, elektrochemicznym i elektrobiologicznym szybkość usuwania związków azotu obniżała się wraz ze wzrostem gęstości prądu i obniżaniem HRT.

Słowa kluczowe

EN

electric current density; rotating electrochemical disk contactor; rotating electrobiological disk contactor; specific denitrification rate; nitrogen removal rate

PL

gęstość prądu elektrycznego; obrotowy elektrochemiczny stycznik dyskowy; obrotowy elektrobiologiczny stycznik dyskowy; określony stopień denitryfikacji; szybkość usuwania azotu

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2020
• Tom: Vol. 46, no. 4
• Strony: 23--32
• Opis fizyczny: Bibliogr. 42 poz., rys., tab., wykr.

Twórcy

autor

Rodziewicz Joanna

• University of Warmia and Mazury in Olsztyn, Poland

autor

Janczukowicz Wojciech

• University of Warmia and Mazury in Olsztyn, Poland

autor

Mielcarek Artur

• University of Warmia and Mazury in Olsztyn, Poland

autor

Bryszewski Kamil

• University of Warmia and Mazury in Olsztyn, Poland

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).