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All Journal BERITA BIOLOGI Annales Bogorienses
Yamagishi, Takao
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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NITROGEN REMOVAL BYAN ACTIVATED SLUDGE PROCESS WITH CROSS-FLOW FILTRATION [Perombakan Nitrogen Menggunakan Proses Lumpur Aktif yang Dilengkapi dengan Filtrasi] Agustiyani, Dwi; Yamagishi, Takao
BERITA BIOLOGI Vol 10, No 1 (2010)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1075.241 KB) | DOI: 10.14203/beritabiologi.v10i1.2049

Abstract

The simultaneous nitrification and denitrification in a single reactor using an activated sludge with cross-flow filtration was investigated.The reactor was a Sequencing Batch Reactor (SBR), operated on three phase conditions, phase I was continuous aeration, phase II was intermittent aeration and phase III was intermittent aeration with methanol addition. The microbial properties on the nitrogen removal processes were monitored by measuring the ammonia decreasing and nitrate production rate.The denitrification rate was also calculated from N20 gas production by acetylene inhibition method.The experiment results show that the nitrification was occurred during the aeration condition, both in the phase I and II. The denitrification was occurred in the anoxic stage (phase III).The nitrate decreasing rate in the anoxic stage (phase IIIA) increased gradually reach the value of 0.19 th mg-N/1/min. on the 8 day operation. The nitrate decreasing rate increased to be 0.45 mg/l/min in the phase IIIB and reach up to 0.70 mg/l/min in the phase IIIC in which the methanol concentrations was increased from 762 mg/L to 1016 mg/L in the phase IIIB and phase IIIC, respectively. The increasing activity of denitrification resulted in decreasing the concentration of TOC in the reactor. More than 80% nitrogen removal occurred in phase III and TOC removal efficiency in phase III reach more than 90%.
Denitrification of Activated Sludge in The Presence of Different Organic Substrates Agustiyani, Dwi; Yamagishi, Takao
Annales Bogorienses Vol. 9 No. 2 (2004): Annales Bogorienses
Publisher : BRIN

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Abstract

The effect of organic carbon denitrifying activity was studied in batch reactor. Fom reactors were operated in parallel under anoxic condition in four different donor electrons. which were acetic acid (Reactor A), methanol (Reactor M), phenol (Reactor P), and glucose (Reactor G). The reactors were fed with the artificial waste, which contain 721.8 mg/l NaNO3. The concentration organic carbon added to the reactors were varied from TOD:N ratio of 0.5:1; 1: 1, 1.5:1, to 2:1. The denitrification activity was estimated by measuring the reduction rate of nitrogenous oxide and N2O gas production. The denitrification capacity of adapted-sludge was also investigated, and the rates were estimated from the cumulative N2O (without acetylene inhibition) and N2 gas production. Reduction rate of nitrogenous oxide in all reactors increased during the investigation; lhe increase reduction rate were correlated to the increase of organic carbon concentration. The maximum reduction rate of nitrogenous oxide in Reactor A was higher than those of the others. However, reduction rate in Reactor M was more constant, so that nitrogenous oxides existed in this reactor was removed faster. The highest potential denitrification rate (N20 production) was observed in sludge of Reactor A. However, N2 gas recovery trom nitrate and nitrite transformed by sludge of Reactor M was the highest. Linear correlation between nitrogenous oxide reduction with gas production was observed in Reactor A, M and P, but not in Reactor G.
Co-Authors Dwi Agustiyani