dTEC Systems L.L.C.
3012 16th Avenue West
Seattle, WA 98119

tel: (206) 281-8757
fax: (206) 283-5044



Welcome Page

Read about dTEC Energy-efficient
wastewater treatment process control
Achieves low-level nitrate/nitrite
Overview of
our current work
Collection of reports, publications,
and patents

  dTEC Patents
  • Method of real-time multi-parameter analysis of pollutants in stormwater and other complex analyte matrices (in preparation)

  • Fuel storage tank monitoring and phase separation detection system (pending)

  • A system for the measurement of water within dissolved non-aqueous liquids (applied for in June, 2005)

  • US Patent No. 5,582,734, Oxidation ditch modification and automated control system for nitrogen removal and sludge settling improvements, Dec. 10, 1996
  • [pdf full text]

  • US Patent No. 6,882,419, System for improved biological nutrient removal, Apr. 19, 2005 [pdf full text]

dTEC Publications

  • A. Ianoul, T. Coleman, and S. Asher, "UV Resonance Raman Spectroscopic Detection of Nitrate and Nitrite in Wastewater Treatment Process," Analytical Chemistry, vol. 74, no. 6, pp. 1458-1461, 2002
  • [pdf full text]

  • H.D. Stensel and T.E. Coleman, "Technology Assessments: Nitrogen Removal Using Oxidation Ditches," Water Environment Research Foundation, Jan. 2000
  • [external link]

  • T.E. Coleman, H.D. Stensel, D. Fleischmann, and W.B. Denham, "Automated ORP Control for Aerobic/Anoxic Cycling in Oxidation Ditch Treatment," Proceedings of the Amer. Soc. of Civil Engr. National Conference on Environ. Engr., Boulder, Colorado, July 1994

  • X.B. Li, S.D. Larson, A.S. Zyuzin, and A.V. Mamishev, "Design Principles for Multi-Channel Fringing Electric Field Sensors," IEEE Sensors Journal, vol. 6, no. 2, pp. 434-440, 2006
  • [pdf full text]

  • X. Li, A.S. Zyuzin, A.V. Mamishev, "Measuring Moisture Content in Cookies Using Dielectric Spectroscopy," IEEE CEIDP Conference, Albuquerque, New Mexico, October 2003
  • [pdf full text]