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Volume 49 (2013)
- Issue 4 Pages 109-
- Issue 3 Pages 75-
- Issue 2 Pages 47-
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Volume 49, Issue 1
Displaying 1-5 of 5 articles from this issue
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ORIGINALS
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MARINO S. MORIKAWA-SAKURA, MARTIN MIGUEL CASCO-ROBLES, MIJUNG KIM, KAZ ...Article type: ORIGINALS
2013 Volume 49 Issue 1 Pages 1-10
Published: 2013
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSIn the present study, the bacterial inoculation and colonization of marine food wastewater with inoculated Lactobacillus plantarum ATCC 8014 was analyzed. Firstly, an inoculation standardization procedure of the bacteria in sterile wastewater, and examined the effect of this inoculation testing for pH kinetics, acidity, soluble proteins and bacterial growth were conducted. The results demonstrate that the inoculated strains have a tendency to decrease pH and to increase acidity, whereas non-inoculated strains had a tendency to keep or decrease acidity. Soluble proteins from the inoculated strains reached a maximum peak before non-inoculated strains. Colonization growth from the non-inoculated strains had a significant higher mortality compared to the inoculated bacteria. The effect of the inoculated L. plantarum on the raw wastewater colonization, with inoculum percentages of 1% and 5%, both with and without molasses were investigated. The results suggested that for both pH and acidity, the most effective inoculums were at 1%, whereas 5% inoculums proved to be effective in decreasing MPN of fecal coliforms and in BOD removal.View full abstractDownload PDF (1556K) -
ZHIJIANG LU, JIEMING LI, RYUHEI INAMORI, KAIQIN XU, NORIO SUGIURA, YUH ...Article type: ORIGINALS
2013 Volume 49 Issue 1 Pages 11-19
Published: 2013
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSBased on macrophyte-buffering improvement methods, this study compared the capability of water quality purification among seven submerged macrophytes through continuous tests. No significant difference in nitrogen and phosphorus removal for each submerged macrophyte species at the water temperature ranging from 15℃ to 25℃, while slight reduction in removal capability was observed at the water temperature less than 15℃ and more than 25℃. The results showed that the removal capabilities were stable in the constructed biological system (CBS) with Ceratophyllum demersum. At low water temperature, the removal capability remained within a certain level in the CBSs with Potamogeton malaianus, Ceratophyllum demersum, Myriophyllum spicatum, Potamogeton oxyphyllus. Among the seven macrophyte species, the strongest affinity with zooplankton was observed for Ceratophyllum demersum. Accrording to the eological insight, cultivation of Ceratophyllum demersum is of prime importance during initial macrophyte-planting in eutrophic waters, because of its strong purification capability and affinity with zooplankton.View full abstractDownload PDF (1624K) -
ZHIJIANG LU, KUNIHIKO KAKAZU, NORIO SUGIURA, RYUHEI INAMORI, KAIQIN XU ...Article type: ORIGINALS
2013 Volume 49 Issue 1 Pages 21-30
Published: 2013
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSThe discharge of domestic and industrial wastewater into water areas such as rivers and lakes has caused serious water pollution, and affected the growth of aquatic organisms. It is necessary to assess the effect of different chemical substances on the stability of aquatic ecosystem. The effects of trace chemical such as surfactant on single species including water flea, algal, and fish have been evaluated in OECD studies. In this study, the eco-risk assessment of surfactant Alchol Ethoxylates (AE) was analyzed using experimental model ecosystem comprising of scallops, fish, and submerged aquatic plants, according to the dynamic in individual number of organisms, and ratio of production to respiration (P/R) determined by DO meter. The results revealed that 1) judging from P/R ratio, DO pattern and number of individual organisms, AE has no influence on the large-scale model aquatic ecosystem at concentration of 2 mg•l－1, which was generally the same as the results of study on microcosm model ecosystem; 2) when the addition of AE concentrations reached to 3 mg•l－1 and 5 mg•l－1, the P and R were changes compared with the controls and the P/R ratio increase to more than 1. 3) when the addition of AE concentrations reached to 10 mg•l－1 and 20 mg•l－1, the P/R decreased to 0.43 and 0.26, respectively. After day 7, the P/R ratio recovered to beginning. These results suggest that as the surfactant AE can be potentially biodegraded, experimental model ecosystem composed large aquatic animals and plants can therefore be used as an effective tool to evaluate the environmental impact risk of chemical substances and stability of real ecosystem.View full abstractDownload PDF (2999K) -
MUNESATO SUGAWARA, YUZURU KIMOCHI, YOSUKE TABATA, KEIJI TEZUKA, RYUHEI ...Article type: ORIGINALS
2013 Volume 49 Issue 1 Pages 31-36
Published: 2013
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSPhosphorus removal and collection from domestic wastewater will make a great contribution to conservation of water environment and saving phosphorus as a valuable resource. Iron electrolytic method, one of the practicalized phosphorus removal technologies, brings about increment in electrical consumption. In this study, energy-saving operation was examined on a small-scale anaerobic-oxic domestic wastewater treatment “Johkaso” system with iron electrolytic method. The obtained results were as follows. The increment in electrical consumption by introduction of the iron electrolytic system could be offset by turning off the blower for aeration in the oxic tank during the hours when there might be almost no wastewater inflow; 4 hours per day. Besides, further development for reduction of electrical consumption would be achieved by control of operation of the phosphorus removal device and the number of working blowers. From the point of wastewater treatment performance, there was little observed bad influence to the suspension of aeration in the oxic tank on the removal of phosphorus and BOD. In contrast, there observed slight decrease in both the nitrification activity and the nitrogen removal efficiency especially in winter. Further it may be required for the development of such as shortening of acclimation of the sludge in the treatment system.View full abstractDownload PDF (1402K)
NOTE
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TAKAHIRO SEKIKAWA, HIROKI HAYASHI, KEISUKE IWAHORIArticle type: NOTES
2013 Volume 49 Issue 1 Pages 37-46
Published: 2013
Released on J-STAGE: March 10, 2018
JOURNAL FREE ACCESSSeveral species of dissimilatory iron-reducing Deltaproteobacteria (DIRD) have been isolated and studied worldwide; they have various applications in microbial fuel cells and in bioremediation strategies such as dissimilatory iron reduction. In this study, we detected DIRD in anaerobic sludge with a high mineral content (Na, K, Ca, and Fe) taken from an anaerobic tank at a landfill leachate treatment system (LLTS) and the first anaerobic filter chamber of an advanced Johkasou system that uses iron electrolysis (AJIE). Ferrihydrite media treated with LLTS or AJIE samples turned black and showed magnetic response. A bacterium closely related to Desulfuromonas palmitatis SDBY1 was found in the LLTS anaerobic sludge by PCR-denaturing gradient gel electrophoresis analysis after incubation. However, no single clear band derived from DIRD was found in the AJIE sample after incubation, although it produced magnetite. The number of DIRD in the anaerobic sludge was quantified by quantitative real-time PCR using a DIRD-specific primer set, and subsequently PCR amplicons derived from DIRD were detected in media containing the LLTS and AJIE samples. DNA sequence analysis of a PCR amplicon from the AJIE sample identified a bacterium closely related to Geobacter lovleyi SZ.View full abstractDownload PDF (2387K)
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