Adsorption of ammonium to activated sludge |
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| Affiliation: | 1. Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Finland;2. Department of Chemical and Biochemical Engineering, Technical University of Denmark, Denmark;1. Department of Zoology, Visva-Bharati University, Santiniketan, WB, India;2. Department of Botany, Visva-Bharati University, Santiniketan, WB, India;1. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China;2. Graduate School of International Relationship, International University of Japan, Minami Uonuma, 9497248, Japan;3. School of Environment, Tsinghua University, Beijing, 100084, China;4. Beijing Enterprise Water Group Limited, Beijing 100102, China;1. University of Turku, Aerobiology Unit, Finland;2. Natural Resources Institute Finland, Finland;3. University of Jyväskylä, Finland;4. Finnish Meteorological Institute, Finland;5. Cornell University, Ithaca, NY, USA |
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| Abstract: | The adsorption of ammonium (NH4+) to the sludge floc matrix has been investigated in two activated sludge treatment plants. When activated sludge was extracted in 1 N KCl the extractable amounts were between 0.5 and 1.3 mg NH4+-N/l higher than the dissolved ammonium concentration at dissolved ammonium concentrations between 1 and 6 mg NH4+-N/l. The difference between the extractable and the dissolved ammonium, the exchangeable ammonium, thus represented 18–30% of the dissolved ammonium concentration. A part of this, around 0.5–0.6 mg NH4+-N/l was not exchangeable under the actual operational conditions in the treatment plants due to a slow desorption kinetics, but seemed to be accessible for nitrification under prolonged aeration. The highest observed amount of adsorbed ammonium corresponded to 0.4–0.5 mg NH4+-N/gSS. Adsorption of ammonium should be investigated in more details and included in models for nitrogen mass balances for activated sludge. |
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