All issues
Volume 37 (2001)
- Issue 4 Pages 135-
- Issue 3 Pages 93-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 37, Issue 3
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
CHANG-SUK JIN, YASUO TANAKA2001 Volume 37 Issue 3 Pages 93-98
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAn innovative upflow sulfur filling up reactor was developed to remove nitrogen of swine wastewater after anaerobic treatment. This reactor consisted of a high DO upper layer filled with polyester unwoven cloth media and a low DO lower layer filled with sulfur pellet containing calcium (S0+CaCO3 pellet) . Anaerobically treated swine wastewater was supplied to the reactor from the middle layer. Overflow from the top of the reactor was partially recirculated to the bottom of the reactor, and the remainder was finally fed to a gravity settling tank. Removal efficiencies of NH4+-N and T-N were affected by the circulation ratio, and maximum removal (63% for NH4+-N, 42% for T-N) was observed at a circulation of 2. Accumulation of NO2--N was observed at a circulation ratio of more than2, but no accumulation of NO3--N was observed at any circulation ratio. Free ammonia concentration in influent and effluent was estimated to range from 4.9 to 100 mg/1 (average: 34.9 mg/l) . Free ammonia would inhibit oxidation of NO2--N. On the other hand, free nitrous acid was less than 0.2mg/l, and it was not inhibited oxidation of NO2--N.
The effluent SO42--S concentration correlated with the decoloration rate (r=0.757), suggesting a relationship between sulfur oxidation and color removal.View full abstractDownload PDF (763K) -
BANDUNEE CHAMPIKA LIYANAGE, YASUO OZAKI, MORIHIRO MAEDA, NOBORU KOBAYA ...2001 Volume 37 Issue 3 Pages 99-110
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe impact of inorganic N fertilization and organic N fertilization on nitrate leaching in Andisol (volcanic ash soil) exposed to extreme rainfall was examined, with regard to different vegetables present. Soil water was collected, using ceramic porous cups installed in different soil layers, and analyzed for NO3-N. Immediately after extreme rainfall, the NO3-N concentrations in soil water at 50 cm depth were markedly increased compared with that of soil water at 100 cm and 200 cm depth, most likely due to the rapid leaching of fertilizer nitrogen caused by downward movement of water through the soil. Nitrate leaching in fields amended with inorganic N fertilizer was greater than in fields amended with organic fertilizers. Soil, treated mainly with organic fertilizers showed higher nitrification activities and to a lesser extent denitrification activities than soils supplied mainly with inorganic N. It was concluded that the rapid nitrate leaching from inorganic fertilizer application in the experimental fields was induced by occasioml single event of rainfall.View full abstractDownload PDF (1511K) -
TAKAHIRO SEKIKAWA, NAOYUKI MIYATA, KEISUKE IWAHORI2001 Volume 37 Issue 3 Pages 111-116
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSProducibility of pellets and treatability of wastewater containing either soluble starch or cornstarch were investigated using an internal-loop airlift reactor with Aspergillus niger in an open system. Average diameters and numbers of A. niger pellets produced were 3.3 mm and about 27, 300 pieces, respectively, when wastewater containing soluble starch was held at pH 3.0 and inoculum spores were 5.00×105 N/l. Moreover, the removal efficiency of TOC and the degradation efficiency of starch reached 76% and 99%, respectively, when wastewater containing cornstarch at 25 g/l was treated in the reactor with pellets. The treatment of high-strength wastewater containing cornstarch by the internal-loop airlift reactor proved effective. An extremely large number of pellets were produced, and the wastewater was treated efficiently with the pellets.View full abstractDownload PDF (2500K) -
MASUO YAMAMOTO, NOBUTADA NAKAMOTO2001 Volume 37 Issue 3 Pages 117-122
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSLead and zinc solutions were added to a laboratory-scale model of a continuous-culture slow sand filter pond in order to ascertain the behavior of these elements. It was found that all the lead was adsorbed in the top few centimeters of the sand column, whereas zinc persisted throughout the column and up to 4%of the added load was present in the effluent. Thus, sand columns exhibit a high capacity for the immobilization of lead. From the distributions of the two elements, 1ead and zinc have been identified as having different mobility characteristics. There was a correlation between lead and total organic carbon in the sand columns, indicating that the adsorption of lead was principally caused by reactions involving organic substances and due to a relationship between the two materials.View full abstractDownload PDF (671K) -
DAISUKE HISHINUMA, AKEMI MAKABE, HIDEO TSURUGA, TOSHIHIKO OOI, SHINICH ...2001 Volume 37 Issue 3 Pages 123-128
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAfungal strain LM-12 was selected for the decolorization of microbially treated nightsoils {filtrate (iv) in Fig.1} and it was identified as Penicillium janthinellum. Strain LM-12 decolorized 50% of the color of the medium with 5.0 g/l glucose and 0.6 g/l ammonium sulfate at 30°C for 24 hr. Over 50% decolorization was not attained in any culture conditions tested, but the increase of the mycelial amount enhanced the decolorization rate. So by using repeated replacement culture, the decolorization period was reduced to 2.0 hr. The amount of nutrient addition could be reduced in further replacement culhlre.View full abstractDownload PDF (2674K) -
YOSHINORI TAKEZAKI, TOSHIHIRO TAKAKI, YASUTOSHI SHIMIZU, SADAMI OHTSUB ...2001 Volume 37 Issue 3 Pages 129-133
Published: September 15, 2001
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe Disposer has gone heralded the disposer's wastewater treatment systems form by public, and is expecting an increase of the setting number. The synthetic wastewater, that is composed of glucose, potato starch, soybean oil and cellulose, was designed for the basic study of the treatment of wastewater from disposer system.View full abstractDownload PDF (616K)
- |<
- <
- 1
- >
- >|