All issues
Volume 38 (2002)
- Issue 4 Pages 175-
- Issue 3 Pages 117-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 38, Issue 3
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
TRUONG QUY TUNG, NAOYUKI MIYATA, KEISUKE IWAHORI2002 Volume 38 Issue 3 Pages 117-135
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAs a result of agriculture, urban and industrial activities, wastes and residues are increasing and are causing environmental pollution. Current cassava starch industry processing, which is discharging voluminous amounts of solid waste and wastewater, is reappeared in this review. Potential pollutions of cassava starch processing (CSP) wastes including two major problems: high loading of organic compound and cyanide content in the exceeding limit are also indicated. The important role of microorganism reflected in the improvement of natural deficient properties of cassava products shows capacity of microorganisms in detoxification of cyanide as well as utilization of raw cassava starchas a substrate for growth and conversion. The information is collected as an evidence to confirm the feasibility of microorganism, particularly filamentous fungi, in the development of microbial treatment system for the reclaimation of the CSP wastes.View full abstractDownload PDF (4533K) -
AKIHIRO HORIO, HIDEAKI ASANO, JUN NAKAJIMA2002 Volume 38 Issue 3 Pages 137-143
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSEffect of disinfection using UV radiation system in rural sewerage facilities was investigated. The treated wastewater before disinfection in 19 domestic wastewater treatment facilities was applied to the UV radiation system in the plant and its disinfection effect was tested.The number of total coliforms after the UV radiation was less than 30 CFU/ml, showing a good and stable performance.The performance of disinfection was not good in the case of chlorination even through residual chlorine was detected in the chlorination effuluent.The double amount of UV dose resulted in the increase of disinfection by 20 times. The UV radiation for 4 sec exhibited the same effect of disinfection as the chlorination.More than 30mW⋅s/cm2 of UV dose was required to get 2log survival ratio.Multiple regression of the survival ratio by UV dose, SS, COD and color showed that the survival ratio was able to be explained by only UV dose.View full abstractDownload PDF (779K) -
TAKU KOIDE, MASAKO FURUYA, TORU IYO2002 Volume 38 Issue 3 Pages 145-151
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe behaviors of Enterobacter spp., Escherichia coli, and Enterococcus faecalis in surface water samples were studied. The number of coliform bacteria such as Enterobacter spp. and Escherichia coli increased in water samples from Hanbara Intake Station that is located downstream from Miyagase Reservoir. The coliform bacteria counts for samples taken from the Hayato River, which is located upstream of Miyagase Reservoir, remained constant. However, the counts of the same bacteria inoculated insaline solution (0.85%) declined. Consequently, it was concluded that coliform bacteria have growth potential in the environment prevailing at Miyagase Reservoir. Furthermore, the study suggested that the observed increase in coliform bacteria might be related to changes in quality of dammed water as well as the natural lakes. On the other hand, E.faecalis did not proliferate in the surface water samples obtained from the Hanbara Station and the Hayato River which were inoculated. In order to adequately assess associated fecal health risks, this study recommends that the detection of colifbrm bacteria in water samples be followed by the detection of Enterococcus spp.View full abstractDownload PDF (800K) -
TAKUYA ODA, HIROYUKI ITO, HIROSHI YANO, SHIBA K. RAI, MASATO KAWABATA, ...2002 Volume 38 Issue 3 Pages 153-158
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA filtration and concentration method using hydrophilic polytetrafluoroethylene (HPTFE) membrane for detecting Cryptosporidium oocysts in source water is described. Ten liters of sample water spiked with approximately 115 or 230 oocysts, were filtered through 142 mm diameter HPTFE membrane with a pore size of 5.0μm. The oocysts captured on the filter were eluted by vortexing then concentrated by centrifugation. Subsequently, the oocysts in the suspension were purified by the immunomagnetic separation (IMS) method and stained with IFA. In addition, recovery efficiencies of the capsule filter filtration method using the IMS method were evaluated. The mean recovery efficiencies obtained were 48% for source water (n=37) and 20% for tap water (n=3) by the HPTFE membrane method, and 19% for source water (n=12) and 5% for tap water by the capsule filter filtration method (n=3) . The total processing (filtration and concentration) time for the HPTFE membrane method was 30 min. These findings demonstrated that the HPTFE method was simple, easy, economic, and rapid, with considerably high recovery efficiency.View full abstractDownload PDF (722K) -
MASUO YAMAMOTO, NOBUTADA NAKAMOTO2002 Volume 38 Issue 3 Pages 159-165
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThis is an experiment in which purifies the comparatively lower level of ionic lead by sand filtration pond model. Similarly, it also tried on zinc. As a continuation of previous work, the behavior of lead and zinc in a continuous-culture sand filtration pond model over 2 weeks were examined by dosing the influent with lead or zinc solutions. The sand filtration pond model was covered with a bath lid. It was found that most lead was adsorbed in the top about 8 cm of the sand columns with only 15% of the added load detected in the effluent, whereas zinc persisted throughout the columns and 78-90% of load was present in the effluent. Thus, sand columns exhibit a high capacity for the immobilization of lead. From a correlation between lead and particulate organic carbon in the sand columns, indicating that the adsorption of lead was principally caused by reaction involving organic substances and due to a relationship between the two materials. These results also highlight the dissimilar mobility of lead and zincView full abstractDownload PDF (2654K) -
JOSEPH D. ROUSE, KENKOU SUMIDA, MAMI OHTA, KENJI FURUKAWA2002 Volume 38 Issue 3 Pages 167-173
Published: September 15, 2002
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSResearch was conducted to further evaluate a denitrifying upflow sludge-blanket (USB) unit process for treatment of soft groundwater amended to a high pH as previously shown to be essential for effective granulation. From kinetic studies, a saturation constant of 15 mg-N/l was determined reflecting a high affinity of the granular sludge for the ethanol-nitrate substrate. The influence of carbon loading during the course of continuous treatment runs demonstrated that nitrite persisted in the effluent at carbon to nitrogen ratios below 1.1. Groundwater samples polluted with nitrate were obtained from two towns in Kumamoto Prefecture and used in continuous treatment experiments. Influent nitrate as high as 29 mg-N/l was completely removed at a HRT of only 30 min. The characteristics of these groundwaters without chemical additions (other than pH adjustment) were well suited for subsistence of granular sludge with good retention characteristics. Discussion was offered to establish protocol for progressing to actual treatment in the field, which should be possible for groundwaters of low hardness common to Japan with only minimal chemical adjustments (e.g., pH) at the treatment site.View full abstractDownload PDF (913K)
- |<
- <
- 1
- >
- >|