The influence of hydraulic retention time and sludge age on activated sludge biocenosis formation in SBRs treating landfill leachates

• Autorzy: Drzewicki A , Klimiuk E. , Kulikowska D.

Warianty tytułu

PL

Wplyw hydraulicznego czasu zatrzymania i wieku osadu na ksztaltowanie biocenozy osadu czynnego w reaktorach SBR oczyszczajacych odcieki ze skladowisk odpadow

• Języki publikacji: EN

Abstrakty

EN

In this study the influence of hydraulic retention time (HRT) and sludge age on organic substances removal (COD), nitrogen removal and formation of activated sludge biocenosis in sequencing batch reactors (SBRs) treating municipal landfill leachate were investigated. Two series were performed (series 1 and 2). Each of them was conducted at HRT 12, 6, 3 and 2 d. Series 1 and 2 were differed in sludge age. In series 1, sludge age was over 2-fold longer than in series 2, which was obtained by volume control of suspended solids disposed in SBR operating cycle. The efficiency of organics removal from leachate (as COD) in series 1 decreased from 82.9% (HRT 12 d) to 70.5% (HRT 2 d) and in series 2 from 83.5% to 71.9%, respectively. Complete nitrification and the ammonia nitrogen concentration in the effluent below 1 mg dm⁻³ was noticed in series 1 at HRT of 3 d and longer. In activated sludge, there were examined 20 taxons. Their number depended mainly on sludge age. At sludge age shorter than 16 d only 5-4 taxons were present. The number of individuals depended both on HRT and sludge age. The richest communities were observed at 12 d HRT in both series. At HRT of 6, 3 and 2 d the total number of individuals was clearly higher in series 1 than in series 2. Type 0092 was dominated among filamentous bacterium.

PL

W pracy badano wpływ czasu zatrzymania (HRT) i wieku osadu na usuwanie zanieczyszczeń organicznych (ChZT) i azotu oraz kształtowanie się biocenozy osadu czynnego w reaktorach SBR oczyszczających odcieki ze składowisk odpadów komunalnych. Przeprowadzono dwie serie badawcze (seria 1. i 2.).Wkażdej z nich badania prowadzono dla czasu zatrzymania (HRT) równego 12, 6, 3 i 2d. Seria 1. i 2. różniły się wiekiem osadu. W 1. był on ponad 2-krotnie dłuższy niż w 2., co uzyskiwano poprzez regulację ilości odprowadzanego osadu nadmiernego w cyklu pracy SBR. Efektywność usuwania zanieczyszczeń organicznych (ChZT) z odcieków w serii 1. malała z 82,9% (HRT 12d) do 70,5% (HRT 2d), a w serii 2. odpowiednio z 83,5% do 71,9%. Całkowitą nitryfikację i stężenie azotu amonowego w odpływie poniżej 1 mg dm⁻³ uzyskano w serii 1. dla wartości HRT równej 3d i wyższej. W osadzie czynnym oznaczono 20 taksonów, a ich liczba zależała głównie od wieku osadu. Dla wieku osadu poniżej 16d odnotowano jedynie 4-5 taksonów. Liczebność mikrofauny zależała zarówno od HRT, jak i wieku osadu. W obu seriach najwyższą liczebność mikrofauny odnotowano dla HRT 12d. Przy krótszym HRT (6, 3 i 2 d) ogólna jej liczebność była wyższa w serii 1. niż w serii 2. Wśród bakterii nitkowatych dominował Typ 0092.

• Wydawca: -
• Czasopismo: Polish Journal of Natural Sciences
• Rocznik: 2007
• Tom: 22
• Numer: 3
• Opis fizyczny: p.425-446,fig.,ref.

Twórcy

autor

Drzewicki A

• University of Warmia and Mazury in Olsztyn, Oczapowskiego St.2, 10-957 Olsztyn, Poland

autor

Klimiuk E.

autor

Kulikowska D.

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