A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Feasibility Study of Complete Nitrogen Removal from Domestic Wastewater by Consequent Nitrification–Denitrification Using Immobilized Nitrifiers in Gel Beads
A two‐stage process for complete removal of nitrogen from domestic wastewater is proposed in this paper. The two stages of this process are an aerobic stage using nitrifying microorganisms immobilized in gel beads and a conventional anoxic stage. The possible application of gel‐entrapped biomass for high‐rate, complete nitrogen removal from domestic wastewater was verified through theoretical and experimental work. Two assumptions were confirmed in the present work: (a) substances present in domestic wastewater do not inhibit nitrification, and (b) heterotrophic biomass that builds up on the surface of nitrifying beads is not expected to affect ammonium oxidation or remove a significant part of the biochemical oxygen demand required for denitrification. The effect of the attached heterotrophic layer on system performance was evaluated through theoretical prediction and short‐term experiments. Calculations indicated that complete nitrogen removal could be achieved if the heterotrophic layer on 2‐mm gel beads is less than 12 m thick. The heterotrophic biofilm observed in the experiments did not homogeneously spread over the entire bead surface. It was found that attached growth of heterotrophs is affected by mixing intensity and type of carrier material.
Feasibility Study of Complete Nitrogen Removal from Domestic Wastewater by Consequent Nitrification–Denitrification Using Immobilized Nitrifiers in Gel Beads
A two‐stage process for complete removal of nitrogen from domestic wastewater is proposed in this paper. The two stages of this process are an aerobic stage using nitrifying microorganisms immobilized in gel beads and a conventional anoxic stage. The possible application of gel‐entrapped biomass for high‐rate, complete nitrogen removal from domestic wastewater was verified through theoretical and experimental work. Two assumptions were confirmed in the present work: (a) substances present in domestic wastewater do not inhibit nitrification, and (b) heterotrophic biomass that builds up on the surface of nitrifying beads is not expected to affect ammonium oxidation or remove a significant part of the biochemical oxygen demand required for denitrification. The effect of the attached heterotrophic layer on system performance was evaluated through theoretical prediction and short‐term experiments. Calculations indicated that complete nitrogen removal could be achieved if the heterotrophic layer on 2‐mm gel beads is less than 12 m thick. The heterotrophic biofilm observed in the experiments did not homogeneously spread over the entire bead surface. It was found that attached growth of heterotrophs is affected by mixing intensity and type of carrier material.
Feasibility Study of Complete Nitrogen Removal from Domestic Wastewater by Consequent Nitrification–Denitrification Using Immobilized Nitrifiers in Gel Beads
Libman, Vyacheslav (author) / Eliosov, Boris (author) / Argaman, Yerachmiel (author)
Water Environment Research ; 72 ; 40-49
2000-01-01
10 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 1995
Nitrogen removal from domestic wastewater using immobilized bacteria
| British Library Conference Proceedings | 1996
Nitrogen removal from domestic wastewater using immobilized bacteria
| British Library Conference Proceedings | 1996
Assesment of nitrification and denitrification rate in biological nitrogen removal from wastewater
| DOAJ | 2007