• Title/Summary/Keyword: Acclimation

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The behavior characteristics of immobilized sludge in waste water treatment using sequencing batch reactor(SBR). (연속 회분식 반응기를 이용한 폐수처리에서 고정화 슬러지의 거동 특성)

  • 최석순
    • Journal of environmental and Sanitary engineering
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    • v.11 no.2
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    • pp.1-7
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    • 1996
  • The behavior of total organic carbon (TOC) and phosphate were observed for 15 days with immobilized activated sludge using polyacrylamide (PAA) by sequencing batch reactor (SBR). In the preparation of immobilized sludge by PAA, it was found that suitable acrylamide concentration for actual wastewater treatment was to be 15% through the batch test. When SBR system was operated in the repeated aerobic and anaerobic conditions, TOC removal efficiency was 92%. The uptake rate of phosphate was increased from 1.78 mg-P/g cell/hr on the 5th day of acclimation to 2.5 mg-P/g cell/hr on the 15th day of acclimation. And the total phosphorus content in PAA bead was increased from 40 mg-P/g cell on the 1st day of operation to 55 mg-P/g cell on the 15th day of operation. From this study, lowering the volume of aeration tank was possible when PAA bead was used in wastewater treatment and long operation was also possible without the settler.

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Ethanol Production from the Seaweed Gelidium amansii, Using Specific Sugar Acclimated Yeasts

  • Cho, Hyeyoung;Ra, Chae-Hun;Kim, Sung-Koo
    • Journal of Microbiology and Biotechnology
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    • v.24 no.2
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    • pp.264-269
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    • 2014
  • For the production of ethanol from seaweed as the source material, thermal acid hydrolysis and enzymatic saccharification were carried out for monosugars production of 25.5 g/l galactose and 7.6 g/l glucose using Gelidium amansii. The fermentation was performed with Pichia stipitis KCTC 7228 or Saccharomyces cerevisiae KCCM 1129. When wild P. stipitis and S. cerevisiae were used, the ethanol productions of 11.2 g/l and 6.9 g/l were produced, respectively. The ethanol productions of 16.6 g/l and 14.6 g/l were produced using P. stipitis and S. cerevisiae acclimated to high concentration of galactose, respectively. The yields of ethanol fermentation increased to 0.5 and 0.44 from 0.34 and 0.21 using acclimated P. stipitis and S. cerevisiae, respectively. Therefore, acclimation of yeasts to a specific sugar such as galactose reduced the glucose-induced repression on the transport of galactose.

Fundamental Study on the Removal Properties of Polyethylene Glycols by Mesh Filtration Batch Bio-reactor (메쉬 침지여과분리형 회분식 생물반응조를 이용한 PEG제거의 기초 연구)

  • Jung, Yong-Jun
    • Journal of Korean Society on Water Environment
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    • v.25 no.4
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    • pp.502-506
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    • 2009
  • The removal properties of Polyethylene glycols (PEGs) known as the important group of synthetic polymers of ethylene oxide were examined by the bio-reactor equipped with a mesh filter module. PEG-1000 and PEG-2000 were fairly removed on the basis of TOC, which were 75.1% and 51.6%, respectively. In the case of PEG-20000, the removal efficiency of TOC was less than 15.2% and the favorable acclimation of microbes was not obtained. It was suggested that this system could effectively maintain microbes for the biodegradation of low molecular weight of PEG and TOC removal was significantly influenced by PEG molecular weight.

Acclimation of magnetic activated sludge with 1,4-dioxane and analysis of bacterial flora in the sludge

  • Toshiyuki Nikata;Hayato Ogihara;Yasuzo Sakai
    • Progress in Superconductivity and Cryogenics
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    • v.25 no.3
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    • pp.7-12
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    • 2023
  • Isolation of pollutant-degrading bacteria is important in bioaugmentation, one of the methods for biological degradation of environmental contaminants. We focused on the magnetic activated sludge (MAS) process as a culture method that efficiently concentrates degrading bacteria, and cultured activated sludge with 1,4-dioxane as a model pollutant. After 860 days of operation, MLVSS, which indicates the amount of sludge, increased from 390 mg/L to 10,000 mg/L, and the removal rate of organic matter including 1,4-dioxane, tetrahydrofuran, and glucose in the artificial wastewater reached up to 97%. Based on these results, the MAS process was successfully used to acclimate activated sludge with 1,4-dioxane. Bacterial flora analysis in the MAS showed that bacteria of the genus Pseudonocardia, already reported as 1,4-dioxane degrading bacteria, play an important role in the degradation of this pollutant. The MAS process is a suitable culture method for acclimation of environmental pollutants, and the findings indicate that it can be used as an enrichment unit for pollutant-degrading bacteria.

Effects of Supplemented Salt in the Diet on Survival, Growth and Body Fluid Composition of Juvenile Grey Mullet (Mugil cephalus) Reared in Freshwater (어린 숭어(Mugil cephalus)의 담수사육에서 염분흡착 사료가 성장, 생존율 및 체액의 조성에 미치는 영향)

  • Chu, Chung;Chang, Young-Jin;Hur, Jun-Wook
    • Journal of Aquaculture
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    • v.13 no.4
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    • pp.317-323
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    • 2000
  • Experimental cohorts of Mugil cephalus were divided into 5 groups : seawater~normal feed (SWN), acclimation to freshwater~normal feed (GFWN), acclimation to freshwater~salt feed (Gf\iVS), freshwater. normal feed (FWN) and freshwater-salt feed (f\iVS). Growth was faster in the SWN, Gf\iVS, and GFWN groups than in the f\iVS and FWN groups. Condition factor did not differ among the groups. Survival (92 %) of the juveniles was the highest in the Gf\iVS group; however, the others showed no significant difference. Moisture of FWN group was significantly higher than that of SWN group (P < 0.05). Potassium concentration was significantly higher in the SWN group than that of others (P < 0.05). It was highest (30 mmolfl) among the cohort of SWN.

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Model Test on the Loss of Experimental Fishy Odor in Tilapia, Oreochromis niloticus, by Sea Water Acclimation (해수순치에 의한 틸라피아의 담수어취 제거에 관한 모델 시험)

  • YOON Ho-Dong;SUH Sang-Bok;KIM Yeong-Sook;LEE Jong-Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.29 no.4
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    • pp.431-437
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    • 1996
  • The efforts of removing the specific fresh water fishy odor were studied by inducing tilapia, Oreochromis niloticus, to sea water in the use of the flavoring chemicals such as pyrrolidine and piperidine as experimental flavors. The amines added to the grinded muscle of tilapia were recovered by $88\%$ for pyrrolidine and $90\%$ for piperidine. When live tilapia were retained in a tank containing 100 ppm solution of the flavor for 30 min and then begun to start the acclimation into sea water with daily increase of $5\%_{\circ}$ salinity within 7days, no amines in the skin and the muscle of tilapia were detected after 4 days of acclimation to sea water. For the purge effects of amino in the skin and the muscle of tilapia, the concentration of pyrrolidine and piperidine lost $73.4\%,\;83.7\%$ in the muscle and $93.6\%,\;90.6\%$ in the skin of tilapia after purging in fresh water for 72 hrs, while $66.2\%,\;73.6\%$ of amines were removed in the muscle and $90.1\%,\;87.7\%$ in the skin of tilapia acclimated to sea water after purging in on sea water for 72hr. Loss rates of pyrrolidine and piperidine were found to be $0.0231h-^{1}\;and\;0.0333\;h^{-1}$ from the muscle and $0.0652h-^{1}\;0.0413\;h^{-1}$from the skin of tilapia in the fresh water, while $0.0131h-^{1}\;and\;0.0354\;h^{-1}$ from the muscle, $0.0674h-^{1}\;and\;0.0549\;h^{-1}$ from the skin of tilapia in the sea water after 24hrs of exposure, respectively.

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