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Carbon and nitrogen removal by biomass immobilized in ceramic carriers

100%

Wojnowska-Baryla I., Zielinska M.

Polish Journal of Environmental Studies

2002

tom 11

nr 5

This experiment was conducted in a bioreactor with biomass immobilized in ceramic carriers. The influence of hydraulic retention time (HRT), carrier structure and intrinsic circulation rate on carbon and nitrogen removal from municipal wastewater were investigated. Two types of ceramic carriers were used at HRT 70, 60, 40, 30 min for carrier I, and 70, 60, 30, 15 min for carrier II, and at the circulation rate of 60, 40 and 20 dm3·h-1. The highest nitrogen removal efficiency was achieved in carrier II at 30 min of reaction. The carbon removal efficiency was similar for both carriers. An increase in internal circulation rate from 20 to 60 dm3·h-1 enhanced nitrogen removal efficiency from 33.0 to 47.2% and decreased in the production of surplus sludge in carrier II.

Changes in microbial communities of nitrifying immobilized biomass: the role of operational conditions

84%

Zielinska M., Cydzik-Kwiatkowska A., Wojnowska-Baryla I.

Polish Journal of Environmental Studies

2012

tom 21

nr 4

Our research determined the impact of operational conditions on the quantity of total and ammonia-oxidizing bacteria (AOB) in immobilized biomass. The experiment was conducted for two kinds of wastewater differing in organic carbon concentration at HRTs of 1.5 h, 1.0 h, and 0.5 h. The evaluation of bacteria number was accomplished by using the real-time PCR targeting ammonia monooxygenase (amoA) and 16S rDNA genes. In the absence of organic carbon in the influent, the shortening of HRT from 1.5 h to 0.5 h positively affected the AOB number in immobilized biomass, which reached even 30%. But their activity was limited. In the presence of organic carbon in the influent, the shortening of HRT below 1.5 h resulted in a decline of the abundance of ammonia-oxidizing bacteria and nitrification efficiency.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

2 Wojnowska-Baryla I.

2 Zielinska M.

1 Cydzik-Kwiatkowska A.

1 2012

1 2002

Wyniki wyszukiwania

Carbon and nitrogen removal by biomass immobilized in ceramic carriers

Changes in microbial communities of nitrifying immobilized biomass: the role of operational conditions