Masahiro OTAKI

→Click here for Japanese version


Professor

School of Human Environmental Science,
Graduate School of Humanities and Science,
Ochanomizu University

2-2-1 Otsuka, Bunkyo-ku, Tokyo 112-8610, Japan
Tel:+81-3-5978-5748
Fax:+81-3-5978-2049
E-mail:otaki.masahiro(at)ocha.ac.jp (please replace (at) to @)
Masahiro OTAKI


  Personal data

 Surname   OTAKI
 Given name MASAHIRO
 Nationality  JAPAN
 sex  Male
 Age 55
 Place of birth Toyama pref.


  Qualification

  1. D.Eng. (Environmental Engineering), University of Tokyo, Japan; 1995.
  2. M.Eng. (Environmental Engineering), University of Tokyo, Japan; 1992.
  3. B.Eng. (Environmental Engineering), University of Tokyo, Japan; 1989.


  Professional Experience

  1. 1995-1997  Research Associate, University of Tokyo, Japan
  2. 1997-1999  Lecturer,       University of Tokyo, Japan
  3. 1999-2011  Associate Professor, Ochanomizu University, Japan
  4. 2012-     Professor, Ochanomizu University, Japan



  Current reserch topic

  1. Survey and research on the water use and waste in developing countries
  2. Physico-Chemical water Treatment
  3. Disinfection processes in water treatment


  Selected Publications

(click to see english abstract)
  1. Otaki Y., Otaki M., Chaminda T., Matsui T., Bokalamulla R. and Thathasarani R. (2022) Demand-side water management using alternative water sources based on residential end-use, Water Practive & Technology, 17(4), pp.949-959
  2. Do Thi Thuy Quyen, Otaki. M, Otaki Y., Chaminda T., Ishara W. S. (2022) Pharmaceutical Contaminants in Shallow Groundwater and Their Implication for Poor Sanitation Facilities in Low-Income Countries, Environ Toxicol Chem., 41(2), pp.266-274
  3. Do Thi Thuy Quyen, Otaki. M, Otaki Y., Chaminda T., (2021) Sewage markers as determinants to differentiate origins of emerging organic pollutants in an urban Sri Lankan water drainage network, Water, 13(20), 2898
  4. Otaki M. and Kazama S. (2021) Evaluation of human Norovirus genogroup-II (HNoV-II) inactivation by ozonated water using quantitative PCR combined with PMA pretreatment, Ozone Science and Engineering, 43(5), pp.490-498
  5. Otaki Y., Otaki M., Chaminda T., Kishimoto Y., Nakazawa Y. and Gimhana K. (2021) Hygiene risk of waterborne pathogenic viruses in rural communities using onsite sanitation systems and shallow dug wells, Science of The Total Environment, 752(15), 141775.
  6. Mizozoe M., Otaki M., Aikawa K. (2019) The Mechanism of Chlorine Damage Using Enhanced Green Fluorescent Protein-Expressing Escherichia coli,Water, 11(10), 2156
  7. Takagi K., Otaki M., Otaki Y. and Chaminda T. (2019) Availability and public acceptability of residential rainwater use in Sri Lanka, J. of Cleaner Production, 234(10), pp.467-476
  8. Takagi K., Otaki M. and Otaki Y. (2018) Potential of rainwater utilization in households based on the distributions of catchment area and end-use water demand, Water, 10(12), 1706; doi: 10.3390/w10121706
  9. Otaki Y., Otaki M. and Aramaki T. (2018) Potential of Efficient Toilets in Hanoi, Vietnam, Water Practice and Technology, 13(3), pp. 621-628
  10. Otaki Y., Otaki M. and Aramaki T. (2017) Combined Methods for Quantifying End-Uses of Residential Indoor Water Consumption, Environmental Processes, 4(1), pp.33-47
  11. Hijikata, N., Tezuka, R., Kazama, S., Otaki, M., Ushijima, K., Ito, R., Okabe, S., Sano, D., Funamizu, N. (2016) Bactericidal and virucidal mechanisms in the alkaline disinfection of compost using calcium lime and ash, Journal of Environmental Management, 181(1), pp.721-727
  12. Otaki Y., Sakura O and Otaki.M. (2015) Advocating water literacy, Mahasarakham International Journal of Engineering Technology, 1(1), pp.36-40
  13. Kazama S. and Otaki M. (2013) Quantitative analysis of the inactivation mechanisms of Escherichia coli by a newly developed method using propidium monoazide, J. of Water and Environment Technology,11(6), pp.507-517
  14. Pham Ngoc Bao, T. Aaramaki, M. Otaki, and Y. Otaki (2013) Water Demand Management: A Strategic Approach Towards Sustainable Water Use System in Hanoi, Journal of water and Environ. Tech., 11(5), pp.403-418
  15. Y. Otaki, M. Otaki, P. N. Bao, T. T. V. Nga and T. Aramaki (2013) Micro-component survey of residential water consumption in Hanoi, Water Science & Technology: Water Supply, 13(2), pp.469-478
  16. Kazama S. and Otaki. M (2012) Inactivation mechanisms of E. coli in the sawdust used in composting toilet, Journal of water and Environ. Tech., 10(4), pp.363-374
  17. Otaki Y., Otaki M., Sugihara H., Mathurasa L., Pengchai P. and Aramaki T. (2011) Comparison of residential indoor water consumption patterns in Chiang Mai and Khon Kaen, Thailand, Journal of AWWA, 103(5), 104-110
  18. Kazama S. and Otaki M. (2011) Mechanisms of bacteria and viruses inactivation in sawdust used in composting toilet, Journal of Water and Environment Technolog, 9(1), 53-66
  19. Kazama S. , Tameike N., Nakagawa N. and Otaki M. (2011) A fate model of pathogenic viruses in a composting toilet based on coliphage inactivation, Journal of Environmental Sciences, 23(6), 1194-1198
  20. M. B. Said, Kazama S., Otaki M. and A. Hassen (2010) Detection of active Escherichia coli after irradiation by pulsed UV light using a Qβ phage, African Journal of Microbiology Research, 4(11), 1128-1134
  21. M. B. Said, Otaki M. and A. Hassen (2010) Detection of viable but non cultivable Escherichia coli after UV irradiation using a lytic Qβ phage, Annals of Microbiology, 60(1), 121-127
  22. Nakagawa, N., M. Otaki, T. Aramaki, A. Kawamura (2009) Influence of water-related appliances on projected domestic water use in Tokyo, Hydrological Research Letters, 3, 22-26
  23. Hong J., Otaki M. and Jolliet O. (2009) Environmental and economic life cycle assessment for sewage sludge treatment processes in Japan, Waste Management, 29(2), 696-703
  24. Otaki Y., Otaki M. and Yamada T. (2008) Attempt to Establish an Industrial Water Consumption Distribution Model, Journal of Water and Environment Technology, 6(2), 85-91
  25. Otaki Y., Otaki M., P. Pengchai, Ohta Y. and Aramaki T. (2008) Micro-components survey of residential indoor water consumption in Chiang Mai, Drink. Water Eng. Sci., 1, 17-25
  26. Akahori Y., Nakai M, Yamasaki K., Takatsuki M., Shimohigashi Y., and Ohtaki M. (2008) Relationship between the results of in vitro receptor binding assay to human estrogen receptor α and in vivo uterotrophic assay : Comparative study with 65 selected chemicals, Toxicology in Vitro, 22(1), 225-231
  27. Otaki Y., Sakura O. and Otaki M. (2007) Water systems and urban sanitation: A historical comparison of Tokyo and Singapore, J. of Water and Health, 5(2), 259-265
  28. Blatchley III, E.R., Gong, W.-L., Alleman, J.E., Rose, J.B., Huffman, D.E., Otaki, M., Lisle, J.T. (2007) Effects of wastewater disinfection on waterborne bacteria and viruses, Water Environment Research, 79(1), 81-92
  29. Akaishi F., Satake M., Otaki M. and Tominaga N. (2006) The surface water quality and information about the environment surrounding Inle Lake in Myanmar, Limnology, 7(2), 57-62
  30. Nakagawa N., Otaki M. Miura S. Hamasuna H. and Ishizaki K. (2006) Field survey of a sustainable sanitation system in a residential house, J. of Environmental Sciences, 18(6), 1088-1093
  31. Nakagawa N., Otaki M. Hana Oe and Katsuyoshi Ishizaki (2006) Application of Microbial Risk Assessment on Residentially Operated Bio-toilet, J. of Water and Health, 4, 479-486
  32. Hong j. and Otaki M, (2006) Association of Photosynthesis and Photocatalytic Inhibition of Algal Growth by TiO2, J. of Bioscience and Bioengineering, 101(2), 185-189
  33. M Bengtsson, Aramaki T., Otaki M. and Otaki Y. (2005) Learning from the future: what shifting trends in developed countries may imply for urban water systems in developing countries, Water Science and Technology: Water Supply, 5(3-4), 121-127
  34. Hong J., Emori H. and Otaki M. (2005) Photodecolorization of Azo dyes by extracellular metabolites under fluorescent light and influence of operational parameters, J. of Bioscience and Bioengineering, 100(2), 192-196
  35. Hong J., Ma H. and Otaki M. (2005) Controlling algal growth in photo-dependent decolorant sludge by photocatalysis, J. of Bioscience and Bioengineering, 99(6), 592-597
  36. Katayama H., **Tanaka A., **Otaki M. and *Ohgaki S. (2003) Determination of naturally occurring Noroviruses in coastal seawater by alkaline elution after acid rinse using negatively charged membrane, Water Science and Technology: Water Supply, 4(2), 73-77
  37. Otaki M., Okuda A., Tajima K., Iwasaki T., Kinoshita S. and Ohgaki S. (2003) Inactivation Differences of Microorganisms by Low Pressure UV and Pulsed Xenon Lamps, Water Science and Technology, 47(3), 185-190
  38. Hong J., Otaki M., J.D. Rouse and Furukawa K. (2002) Continuous treatment of azo acid dyes by photo-dependent denitrifying sludge, J. of Environmental Sciences, 14(3), 296-302
  39. Takizawa S., Fu L., Pradhan N., Ike T., Otaki M. and Ohgaki S. (2001) Pretreatment processes for membrane filtration of raw water containing manganese, Water Science and Technology, 1(5/6), 341-348
  40. Alam M.Z.B., Otaki M., Furumai H. and Ohgaki S. (2001) Direct and indirect inactivation of Microcystis aeruginosa by UV -radiation, Water Reserch, 35(4), 1008-1014
  41. Otaki M., Hirata T. and Ohgaki S. (2000) Aqueous Microorganisms Inactivaation by Photocatalytic Reaction, Water Science and Technology, 43(3/4), 115-118
  42. Otaki M., Takizawa S. and Ohgaki S. (1998) Control and Modeling of Membrane Fouling due to Microorganism Growth by UV Pretreatment, Water Science and Technology, 38(4-5), 405-412
  43. Otaki M., Yano K. and Ohgaki S. (1998) Virus Removal in Membrane Separation Process, Water Science and Technology, 37(10), 107-116
  44. Lee S., Nishida K., Otaki M. and Ohgaki S. (1997) Photocatalytic inactivation of phage Qβ by immobilized titanium dioxide mediated photocatalyst, Water Science and Technology, 35(11-12), 101-106
  45. M. Otaki, N. Kamiko, K. Yamamoto, S. Ohgaki
    Decomposition of Organo-Chlorine Compounds by Medium and Low Pressure UV Lamps
    J. of JWWA, Vol. 64, No. 2, pp.24-32, 1995 (in Japanese)




  Presentation in International Conference

  1. Do Thi Thuy Quyen, Otaki. M. and Chaminda T.
    Organic Wastewater Compounds in Sewage Treatment Plant, Hospital Discharge and Drainage Canal System in Galle city, Sri Lanka
    Proc. of Water and Environment Technology Conference (WET conf.),On-line, 2021
  2. H.U.E. Imasha, G.G.T. Chaminda, M. Otaki, Y. Otaki and C.P. Rupasinghe
    Assessment of domestic greywater quality to determine the potential reuse in urban residentials
    Proc. of 7th International Symposium on Advances in Civil and Environmental Engineering, Practices for Sustainable Development (ACEPS-2019), p.136-, 2019
  3. Moriyama H., Otaki M., Kazama S., and Masago Y.
    Investigation of Unknown Genomes through Metagenomic Analysis of (+)ssRNA Viruses in wastewater
    Proc. of Water and Environment Technology Conference (WET conf.),Matsuyama , 2018
  4. Takagi K., Otaki M., Otaki Y. Chaminda T.
    Influence of Providing Information on Public Acceptance towards Rainwater Usage in Sri Lanka
    Proc. of Water and Environment Technology Conference (WET conf.),Matsuyama , 2018
  5. Nishida K. Otaki M.
    Analysis of alternative rainwater use from data of end-user water demand
    Proc. of 7th IWA-ASPIRE conference 2017, Kuala Lumpur, Malaysia, 2017
  6. Moriya Y. and Otaki M.
    Improvement of turbidity removal rate with visible light irradiation in the flocculation process
    Proc. of Water and Environment Technology Conference, p.39, Tokyo, 2015
  7. Mizuno K. Otaki M.
    Wavelength dependency of coliphage inactivation by polychromatic UV lamp
    Proc. of Water and Environment Technology Conference 2012, p.11, Tokyo, 2012
  8. Mawatari S., Otaki M.
    Development of quantitative analysis of heterotrophic bacteria by T-RFLP method
    Proc. of Water and Environment Technology Conference 2012, p.2, Tokyo, 2012
  9. Moriya Y., Otaki M., Sekiyama M., Tateno I., Iwasaki T. and Hiroto Y.
    Examination to control the algal growth in the water purification process by Ultraviolet radiation
    Proc. of the 4th IWA-ASPIRE conference, pp.198-199, Tokyo, 2011
  10. Pham Ngoc Bao, Aramaki T., Otaki Y. and Otaki M.
    An analysis of water consumption and prospects for implementing household water use demand management in Hanoi city
    Proc. of the 4th IWA-ASPIRE conference, p.206, Tokyo, 2011
  11. Otaki Y., Otaki M., P. N. Bao, H. Rei, and Aramaki T.
    Micro-components survey of residential water consumption in Hanoi
    Proc. of the 4th IWA-ASPIRE conference, p.313, Tokyo, 2011
  12. Ping Leng, Otaki M. and Otaki Y.
    Comparison of the questionnaire and the direct measurement surveys for understanding the domestic water consumption in each purpose
    Proc. of the 4th IWA-ASPIRE conference, pp.386-387, Tokyo, 2011
  13. Fuzisaki M. Irokawa S. and Otaki M.
    Development of chemical dosimetry for UV flow reactor using fluorescence analysis
    Proc. of the 4th IWA-ASPIRE conference, p.479, Tokyo, 2011
  14. Kazama S., Otaki. M,
    The mechanism of microorganisms inactivation in composting toilet
    Proc. of 7th International Symposium on Sustainable Water and Sanitation System, Paris, 2010.
  15. Kaiga N., Otaki M., Sera Y. and Takahashi M.
    Evaluation of the Raw and Process Water in the Purification Plant by Fluorescence Intensity
    Proc. of 19 th Ozone World Congress & Exhibition, (CD-ROM), Tokyo, 2009
  16. Hiroto Y., Iwasaki T., Kinoshita S. and Otaki M.
    Research on the Actinometer corresponding to high dose range
    Proc. of 19 th Ozone World Congress & Exhibition, (CD-ROM), Tokyo, 2009
  17. Otaki M. and Nakagagwa N.
    Environmental loads of a decentralized wastewater treatment
    The 6th International Symposium on Sustainable Sanitation, 長春(中国),2008
  18. Kazama S. and Otaki M.
    Fate of indicator bacteria for pathogenic viruse in composting toilet
    The 6th International Symposium on Sustainable Sanitation, 長春(中国),2008
  19. Nakagawa N., Otaki M. and Sekine M.
    Life Cycle Assessment of a decentralized wastewater treatment system with a composting toilet ?Case study in Chichibu city-
    Proc. of the 5th Inter. Symp. on Sustainable Sanitation, 23-28, 2007
  20. Otaki M, Nakagawa N., Kazama S., Akaishi F. and Tameike S.
    Hygienic risk assessment and control in using composting toilet
    Proc. of the 5th Inter. Symp. on Sustainable Sanitation, 163-170, 2007
  21. Ishizaki K., Nakagawa N., Otaki M. and Nakanishi Y.
    Sustainable sanitation in households
    Proc. of the 5th Inter. Symp. on Sustainable Sanitation, 189-194, 2007
  22. Nakagawa N, Otaki M and Sekine M.
    Impact on society of a decentralized wastewater treatment system: Case study in Chichibu city
    Proc. of Inter. Conf. on Hydrology and Water Resources Management for Hazard Reduction and Sustainable Development, Manila, Philippines, 2007
  23. Hong J., Otaki M. and Jolliet O.
    LCA study of sewage sludge treatment in Japan
    International Life Cycle Assessment and Management Conference, Portland, USA, 2007
  24. N. Nakagawa, M. Otaki and K. Ishizaki
    Application of microbial risk assessment on SUSSAN system in Miyako island
    Proc. of the 4th International Symposium on Sustainable Sanitation(CD-ROM), 2006
  25. M. Otaki, F. Akaishi, K. Kubo and M. Tameike
    The fate of health-related microorganisms in the composting toilet and the influencing factors
    Proc. of the 4th International Symposium on Sustainable Sanitation(CD-ROM), 2006
  26. M.Otaki, N. Nakagawa, F. Akaishi and K.kubo
    The fate of Microorganisms in the composting toilet from the view point of Hygienic Risk
    Proc. of 2nd International Dry Toilet Conference, Tampere, Finland, August 16-19, 2006
  27. N. Nakagawa, M. Otaki and K. Ishizaki
    Analysis of the hygienics safety for a sustainable sanitation system in Miyako island
    Proc. of AOGS 2006, Singapore, July 10-14, 2006
  28. Yurina Otaki, Masahiro Otaki, Petch Pengchai and Osamu Sakura
    Water systems and urban sanitation - A historical comparison of Tokyo and Singapore and case study in Thailand
    Proc. of 4th conference of the International Water History Association -Water and Civilization, Paris France, December 1-4, 2005
  29. N. Nakagawa, M. Otaki
    Suitability of grey water treatments for a sustainable sanitation system
    Proc. of UNESCO International Symposium on Ecohydrology 2005, Bali, Indonesia, 2005
  30. T. Aramaki, L. Mathurasa, S. Sivakumaran, M. Bengtsson, Y. Otaki and M. Otaki, Haruka Sugihara
    Analysis of Water Use in Each Domestic Purpose for Its Forecast in Various Regions
    Proc. of Open Meeting of IHDP, Bonn, Germany, 2005
  31. L.Mathurasa, H.Sugihara, T.Aramaki, M.Otaki, P. Kucivilize and W. Wirojanagud
    Analysis and Forecast of Domestic Water end-uses in Khon Kaen Province, Thailand
    Proceedings of Aqua Asia Forum 2005, October 6-7, Bangkok, Thailand, 2005
  32. K. Ishizaki, N. Nakagawa and M. Otaki
    Field survey of a sustainable sanitation system in Miyako island in Japan
    Proc. of Asia Oceania Geosciences Society 2nd Annual meeting, (CD-ROM), 2005
  33. N. Nakagawa, M. Otaki, H Oe, and K. Ishizaki
    Application of microbial risk assessment on the Bio-toilet in a residential house
    Proc. of the IWA conference 2005 Xi'an (Future of Urban Wastewater Systems Decentralization and Reuse), 29-38, 2005
  34. M. Otaki, N. Nakagawa, F. Akaishi and M. Tanaka
    Pathogen Risk Assessment In Using Bio-toilet
    Proc. of the 3rd International Symposium on Sustainable Sanitation, pp. 73-78, 2005
  35. M. Bengtsson, T. Aramaki, M. Otaki and Y. Otaki
    Learning from the Future: What Shifting Trends in Developed Countries may Imply for Its Urban Water Systems
    Proc. of Efficient 2005, Santiago de Chile, 2005
  36. M. Otaki, F. Akaishi and M. Tanaka
    Fate of pathogenic microorganisms in the media used in bio-toilet
    Proc. of the 2nd International Symposium on Sustainable Sanitaion, pp.37-44, 2004
  37. M. Bengtsson, T. Aramaki, Y. Otaki and M. Otaki
    Urban Water Use: What Can Be Learnt from an International Comparison?
    Proc. of IWA World Water Congress 2004, 2004
  38. N. Nakagawa, M. Otaki, S. Miura, H. Hamasuna and K. Ishizaki
    Availability of sustainable sanitation system in a residential house
    The 2nd APHW Conference (APHW2004 in Singapore), 2004
  39. T. Iwasaki, S. Kinosihta, M. Otaki, K. Hikosaka and Y. Nakai
    The effect of inactivation for C.parvum by Pulse lamp
    Proc. of 2nd Asia Conference on Ultraviolte Technologies for Environmental Applications, 2004
  40. S.Nakata, M.A.Lopez Zavala, N. Funamizu, M.Otaki and T.Takakuwa
    Temperature effect on pathogens decline in the bio-toilet system
    Proc. of Dry Toilet 2003, 1st International Dry-Toilet conference, pp.131-139, Tampere, Finland, 2003
  41. Y. Otaki, M. Otaki and O. Sakura
    Environmental History of Water Use in Tokyo
    Proc. of 3rd Int. Water History Ass. conference (held in Alexandria, Egypt)
  42. M. Otaki
    The fate of pathogenic microorganisms in composting toilet and risk assessment
    CREST-Sustainable Sanitation Simposium in Nangjing, 2003
  43. M. Otaki, M. Okamoto and Y. Yakuyama
    Identification and Investigation of Influencing Factors on UV Disinfection
    Proc. of Asian waterqual 2003, (CD-ROM), 2003
  44. T. Aramaki, Y. Otaki, M. Suzuki, K. Hanaki and M. Otaki
    Forecasting and Controlling Domestic Water Demand in an Urban Area,BR> 10th US-Japan Workshop on Global Climate Change, 2003. (Poster, Irvine, CA, USA)
  45. Y. Otaki, M. Otaki, T. Aramaki and O. Sakura
    Residential water demand analysis by household activities
    Proc. of 2nd Int. Conf. on Efficient Use and Management of Urban Water Supply - Efficient 2003 (held in Canary islands, Spain)
  46. M.Otaki and S.Ohgaki
    the decomposition of organohalogen compounds by low and medium pressure UV lamps
    IUVA 1st regional conference (held in Singapore),2002
  47. M. Otaki, A. Okuda, K. Tajima, T. Iwasaki, S. Kinoshita and S. Ohgaki
    Inactivation Differences of Microorganisms by Low Pressure UV and Pulsed Xenon Lamps
    Proc. of IWA world water congress 2002 (held in Melbourne),
  48. N. Nakagawa, M. Otaki, K. Ishizaki
    The technical trend at the low environmental load type toilets in Japan,
    Proc. of IWA 2nd World Water Congress (held in Berlin), pp240, 2001
  49. M. Otaki, D.E. Huffmann, J. B. Rose
    The Variation of UV Sensitivity of Indigenous Phages in Secondary Wastewater Effluents
    Proc. of 101st ASM general meeting, pp.596, 2001
  50. N. Nakagawa, M. Otaki, K. Ishizaki
    The technical trend at the low environmental load type toilets in Japan
    Proc. of IWA 2nd World Water Congress (held in Berlin), pp240, 2001
  51. M. Otaki, S. Takizawa and S. Ohgaki
    Control and Modeling of Membrane Fouling due to Microorganism Growth by UV Pretreatment
    Proc. of IAWQ 19th Biennial International Conf, Vancouver, June 21-26, 1998, pp.167-174 (Book 4)
  52. A.Sathasivan, S. Ohgaki and M. Otaki
    Evaluation of Water Treatment Process in Terms of Bacterial Regrowth Control
    (Poster presentation), IAWQ 19th Biennial International Conf, Vancouver, June 21-26, 1998,
  53. M.Z.B. Alam, M. Otaki and S. Ohgaki
    Algicidal Effect Caused by Algal Extracellular Products
    (Poster presentation), IAWQ 19th Biennial International Conf, Vancouver, June 21-26, 1998,
  54. M. Otaki, K. Yano, S. Karasawa and S. Ohgaki
    Fate of Indigenous Coliphages in Pilot Scale Membrane Processes
    Proc. of 6th IAWQ Asia-Pacific Regional Conference, Seoul, May 20-23,1997, pp.1491-1498.
  55. B. Lee, S. Takizawa, S. Ohgaki, M. Otaki and K. Fujita
    Concentration Thickening by Hollow-Fiber Microfilter in Membrane Water Treatment Processes
    Proc. of 6th IAWQ Asia-Pacific Regional Conference, Seoul, May 20-23,1997, pp.1468-1474.
  56. V. Aravinthan, K. Komatsu, S. Takizawa, S. Ohgaki and M. Otaki
    Denitrification of Sludge Hydrolysate by Immogilized Microorganisms
    Proc. of 6th IAWQ Asia-Pacific Regional Conference, Seoul, May 20-23,1997, pp.822-829.
  57. S. Lee, M. Otaki and S. Ohgaki
    Photocatalytic inactivation of phage Qβ by immobilized titanium dioxide mediated photocatalyst
    Proc. of Health related water microbiology 1996 (organaized by the IAWQ specialist group)in Mallorca (Spain), October 6-10, 1996, pp.57.
  58. M. Otaki, K. Yamamoto and S. Ohgaki
    Decomposition Ratio of Organohalogenides by Low and Medium Pressure UV Lamps in Considering of Germicidal UV Dose
    Proc. of poster presentation, IAWQ 18th Biennial nternational Conference in Singapore, June 23-28, 1996, pp.58.
  59. M.Ohtaki and S. Ohgaki
    Photochemical Decomposition of Organo-Chlorine Compounds by Medium Pressure UV Lamp
    Proc. of poster presentation, IAWQ 17th Biennial International Conference in Budapest, July 24-30, 1994, pp.110.



>> Back <<