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Volume 47 (2011)
- Issue 4 Pages 137-
- Issue 3 Pages 103-
- Issue 2 Pages 51-
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Volume 47, Issue 2
Displaying 1-6 of 6 articles from this issue
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ORIGINALS
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CHUNLIAN XU, QIANWU SONG, JIANKUN DAI, HAIMING HUANG, RYUHEI INAMORI, ...Article type: ORIGINALS
2011 Volume 47 Issue 2 Pages 51-58
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSDomestic wastewater quality varies greatly with the property of decentralized source pollution. Through the monitoring and comparative research it was clear that the decentralized domestic wastewater quality in China is usually as follows: CODcr: 200~1000mg/l, BOD5: 100~500mg/l, SS: 100~500mg/l, TN: 20~90mg/l and TP: 3~15mg/l. Ratio of BOD5 to CODcr is 0.4~0.6, showing high biodegradability. A verification study has been conducted by the advanced Johkasou of cycling anaerobic filter bed-biofiltration process to determine the effect of different pollutant concentration on the biological treatment efficiency. By these examinations fundamental methods of evaluation of Johkasou performance in China have been established on the whole.View full abstractDownload PDF (995K) -
TAKANORI FUJIMOTO, KIYOTAKA OKUNO, TAKASHI MIZOGUCHI, KEITARO WATANABE ...Article type: ORIGINALS
2011 Volume 47 Issue 2 Pages 59-66
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSA sludge solubilization system with the combination of alkaline treatment and high speed mixer was practically operated in a petroleum refinery, however , solubilization rate was reduced vigorously by the abundant metal ions from the change of wastewater composition. Therefore, effects of metal ions on solubilization rate were investigated. With the increase of Ca and Mg ions reduced solubilization from 40％ to 25％. This phenomenon might be caused mainly by Ca ion increase in the sludge derived from wastewater containing abundant metals （Na, Ca, Mg, K and so on）. Furthermore, by the addition of polyaluminium chloride （PAC） in solubilizing process could reduced Ca in the sludge and resulted the increase of solubilizing rate. 150 mg/l of PAC addition continuously increased solubilization rate from 20％ to 45％ and this effect of PAC addition kept more than 25 days.View full abstractDownload PDF (1380K) -
KAZUICHI ISAKA, NAOKI ABE, YUYA KIMURA, MASATOMO WATANABE, TOSHIFUMI O ...Article type: ORIGINALS
2011 Volume 47 Issue 2 Pages 67-74
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSNitrogen removal performance of a polyethylene glycol (PEG) gel carriers with entrapped heterotrophic denitrifying bacteria was evaluated at room temperature (20℃). Methanol was used as hydrogen donor for denitrification. A lab-scale reactor for the denitrificatnion process was operated for the treatment of synthetic nitrite and nitrate wastewater. First, nitrite was used as a nitrogen source in order to evaluate the nitrogen removal performance on the start-up periods. As a result, nitrite removal activity increased gradually, reaching 1.4 kg-N m-3 d-1 on day 46. After that, high-loading test was conducted using synthetic nitrate wastewater. A maximum nitrogen removal rate of 3.6 kg-N m-3 d-1 was confirmed. However, nitrite accumulation was observed when nitrogen loading was exceeded the capacity of the reactor. It was suggested that the denitrification rate was decreased by accumulated nitrite.View full abstractDownload PDF (2205K) -
ERI NAKAKIHARA, RYOKO YAMAMOTO－IKEMOTO, MORIHIRO TAKANO, TAKAHIRO YAMA ...Article type: ORIGINALS
2011 Volume 47 Issue 2 Pages 75-86
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSEffect of wood chips mixing soil on nitrogen removal from agriculture leacheate was examined using soil columns. Cellulose in wood chips was utilized for electron donnor for denitirification and sulfate reduction in the soil columns. Preincubation of wood chips with activated suldge was effective for increase in nitrogen removal. Microbial community of sulfate-reducing microorganisms in the soil column were examined by a nested PCR-DGGE targeting dissimilatory （bi）sulfite reductase genes. Many sulfate-reducing microorganisms are present in wood chips and rotting woods of the soil columns and incubation under denitrification condition or sulfate reducing condition resulted in a difference of microbial community. Sulfate-reducing microorganisms attached around wood may related to degradation of wood.View full abstractDownload PDF (1981K) -
KEITA TAKAKI, MASAHIKO OKUDA, HIROKI ITOKAWA, HITOSHI NAKAZAWA, KENJI ...Article type: ORIGINALS
2011 Volume 47 Issue 2 Pages 87-94
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSRecently, the anammox （anaerobic ammonium oxidation） process is attracting attention as a novel microbiological nitrogen removal process. It makes possible to reduce the operational costs of aeration and carbon sources （e.g. methanol） compared with the conventional nitrification/denitrification process. This study focuses on the feasibility of nitrogen removal from an anaerobic digestion supernatant using a fixed-bed anammox reactor. In a demonstration test for the treatment of wastewater containing high concentration ammonium, the maximum nitrogen removal rate of 2.90 kgN･m－3･d－1 was obtained after about 80 days of operation. The ratio of ammonium and nitrite consumption and nitrate production was 1:1.26:0.20. In case the nitrite concentration at the inlet of anammox reactor increased, the nitrogen removal rate gradually decreased. The inhibition of anammox activities was obvious by nitrite concentration higher than about 100mg･L－1. The effects of fluctuation in the influent nitrogen load were also evaluated by intentionally increasing the influent ammonium concentration. When the anammox reactor was operated with the influent load ranging from 2.76 kgN･m－3･d－1 to 3.61 kgN･m－3･d－1, the performance was little changed from steady operation, attaining the average nitrogen removal efficiency of 81％.View full abstractDownload PDF (1197K) -
FENG YAN, TAKURO KOBAYASHI, SHITARO TAKAHASHI, YU-YOU LI, TATSUO OMURAArticle type: ORIGINALS
2011 Volume 47 Issue 2 Pages 95-102
Published: 2011
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSA mesophilic （35℃） UASB reactor treating synthetic wastewater containing methanol as sole carbon source was continuously operated for over 430 days by changing the volume loading rate from 2.5 to 120 kg-CODCr・m−3・d−1. The microbial community structure of the granules was analyzed with the molecular tools and its metabolic characteristics were evaluated using specific methanogenic activity test. The process was successfully operated with over 95％ soluble CODCr removal efficiency at VLR 30 kg-CODCr・m−3・d−1 for approximately 300 days, and granulation satisfactory proceeded. Granules of 0.1 to 2 mm in diameter mainly consist of aggregated coccoid cells. Specific methanogenic activity tests indicate that the methanol-methane pathway and the methanol-H2/CO2-methane pathway are predominant in the methane fermentation of the methanol. The results of cloning and fluorescence in situ hybridization analysis suggests that Methanomethylovorans hollandica were predominant in the reactor, and formed a large cluster as a granule, which is different from the Methanosarcina-dominant community previously considered in the researches on anaerobic methanol treatment.View full abstractDownload PDF (3682K)
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