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Volume 28 (1992)
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Volume 28, Issue 1
Displaying 1-7 of 7 articles from this issue
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Jae-Kyung YANG, Kennichi OSUGE, Okihiko Hirasa, Tadahiro MORI1992 Volume 28 Issue 1 Pages 1-6
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA new biological process for the removal of dissolved sulfide is proposed. The prccess is based on the oxidation of sulfide to elemental sulfur and sulfate by sulfur oxidizing bacteria.
Studies on removal charactistics and sulfur balance were conducted in the labofatory scale experiment. Almost of suifide was converted to sulfate or elemental sulfur and higher efficiency of sulfide removal was obtained at low sulfide load.The datk green colour of the suspended solids in the reactor can be attributed to poly sulfide at high sulfide load. The following results were obtained:
1) .Sulfide removal ratios were higher than 90 percent until the sulfide loading of 417 mg-S2·d-1·l-1.
2) .The maximum sulfide removal rates were approximately 10mg-S2⋅g-SS-1⋅d-1 (per unit of biomass) and 0.4 mg-S2⋅cm-2⋅d-1 (per mit of surface aera of the hollow fiber membrane) .
3) .The persents of sulfur in biofilm and prccipitated solids were 11.3%, 6.1% and 7.0%, 7.9%in reactor 1 and 2, respectively.
4) .Sulfur oxidizing bacteria contaminated from the air foamed the biofiim on the hollow fiber membrane and transformed sulfide into sulfate and elemental sulfur. Inoculation ofbeggiatoa is not necessary.View full abstractDownload PDF (571K) -
Nobutada NAKAMOTO, Masashi SAKAI1992 Volume 28 Issue 1 Pages 7-16
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWhen the bed resistance of slow sand filter increases, the schmutzdeck on the surface bed must be removed by scraping. The indication of the decision of this work is the increase of the head loss. However the head loss changes with the fil tering rate. The calculated head loss at the normal flow rate of 20cm/h is introduced as the normalized head loss which is popular in England. The normalized head loss at Someya water works in Ueda city, Nagano quickly increases in winter when the water temperature is low. In the growing season of filamentous algae, the normalized head loss does not increase.The algal mat is like as a blanket herb and it prevent the clogging of filter. The filter operations at several water works are compared with the data redrawn in normalized head loss.View full abstractDownload PDF (967K) -
Norio HAYASHI, Yuhei INAMORI, Tokuo Iwami, Mitsumasa OKADA, Ryuichi SU ...1992 Volume 28 Issue 1 Pages 17-24
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSBiological treatment process is a typical ecosystem composed of bacteria, fungi, protozoa and small metazoa. However, the role of small metazoa in the purification process has been known only little compared to that protozoa in the biological treatment process. The present study, therefore, was performed to aim at elucidating the role of small metazoa on the purification in biological treatment process by examining their growth and purification characteristics. The purpose of this study was to make clear the interactions on growth between protozoa and small metazoa with mixed culture. In this study, Rotatoria such asPhilodina erythrophthalma (P), Oligochaeta such asAeolosoma hemprichi (A), Protozoa such asColpidium camphylum (C) and Bacteria such asAcinetobacter calcoaceticusIAM 1517 were used as one the case of mixed culture. Results may be summerized as follows : (1) The growth ofP. eryhrophthalmaandA. hemprichiwere decreased remarkably in case of inoculate P, A, C at the same time simultaneously. (2) Maximum number (Nmax) ofC. ramphylumat the logalistic growth phase ofP. erythrophthalmaandA. hemprichi. (3) Specific growth rate and Nmax ofC. camphylumat the stationary phase ofP. erythrophthalmaandA. hemprichi. (4) Growth abilities was enhanced in order of monoxenic culture (P system and A system), PA system, PAC system and PC or AC systems.View full abstractDownload PDF (800K) -
Haruki MYOGA, Hideyuki ASANO, Fudeko KAKUDA1992 Volume 28 Issue 1 Pages 25-31
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSExperimental investigations of the effects of the different kinds of hydrogen donors addition on the sludge selfimmobilization of upflow sludge blanket (USB) denitrification reactors were carried out. Results indicated that highly settleable and active granular sludge was produced when using methanol as the hydrogen donor andHyphomicrobiumwas the dominant bacteria in the granular sludge. On the other hand, in tests using glucose and acetate as the hydrogen donor, reactor performance was much poorer than when using methanol as the donor. Although the mechanism of sludge self-immobilization could not be made clear, the factors such as tangling of filamentous-like bacteria, gentle mixing, upflow reactor situation and extracellular biopolymers production, seem to be most important for granular sludge formation in comparison with other self-immobilization processes.View full abstractDownload PDF (5158K) -
Hiroshi FUKUSHIMA, Tsuyako KO-BAYASHI, Mika KURIHARA, Harue FUJITA1992 Volume 28 Issue 1 Pages 33-39
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (2338K) -
Hiroshi FUKUSHIMA, Tsuyako KO-BAYASHI, Mika KURIHARA, Harue FUJITA1992 Volume 28 Issue 1 Pages 40-45
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (10029K) -
Hiroshi FUKUSHIMA, Tsuyako KO-BAYASHI, Mika KURIHARA, Harue FUJITA1992 Volume 28 Issue 1 Pages 46-50
Published: June 30, 1992
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (8251K)
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