Nitrite Accumulation at Low Copper Concentration in a Submerged Partial Bionitrification Reactor
| Autor: | Sukru Aslan, Burhanettin Gurbuz |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
021110 strategic defence & security studies 0211 other engineering and technologies Low copper Environmental engineering nitrite accumulation rate 02 engineering and technology TA170-171 010501 environmental sciences copper inhibition 01 natural sciences partial nitrification chemistry.chemical_compound chemistry upflow bioreactor Nitrite 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | 대한환경공학회지, Vol 43, Iss 6, Pp 419-427 (2021) |
| ISSN: | 2383-7810 1225-5025 |
| DOI: | 10.4491/ksee.2021.43.6.419 |
| Popis: | Objectives : Effects of various Cu2+ concentrations in the synthetic wastewater on nitrite accumulation was investigated in a submerged partial biofilter reactor (SPBNR).Methods : Experiments were carried out at the constant operational conditions (T=35℃; pH=9.0 and DO=2.0 mg O2/L) by varying the concentrations between 5-50 mg Cu2+/L. The SPBNR, which was operated in an upward flow mode, set-up consisted of a cylindrical stainless steel. The support materials filling ratio was about 23% of the total reactor volume. The SPBNR was inoculated with microorganism drawn from a batch experimental biological reactor operated about one month by using the synthetic wastewater composition.Results and Discussion : Before exposure to Cu2+, the highest loading rate of 1.3 g NH4-N/(m2.day) was determined under the operational conditions. Addition of 5 µg Cu2+/L into the waters promoted the activity of organisms and the loading rate achieved to 1.6 g NH4-N/(m2.day). At the control operational condition, the ratio of NO2-N/NOx-N was determined as 0.74, while the ratio increased to 0.78 at the Cu2+ concentration of 5 µg/L.Conclusions : Results indicated that the ammonium oxidizing bacteria (AOB) is more stimulated than the nitrite oxidizing bacteria (NOB) at the concentration of 5 µg Cu2+/L. However, approximately equal NH4-N removal rate (ANRR) and NO2-N accumulation rate (NiAR) losses indicated that the AOB and NOB are approximately equally effected at the inlet concentrations of 35 and 50 µg Cu2+/L. |
| Databáze: | OpenAIRE |
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