Research interests

My research activities are primarily focused on two general areas: (1) conversion of waste into energy, and (2) characteristics, fate and transport, and treatment of surface runoff pollutants.  Major research topics of interest include:

–        Particle-bound organic and inorganic pollutant characterization;

–        Mathematical modeling of roadway runoff pollutants;

–        Source identification of non-point source pollutants from environments;

–        Innovative stormwater runoff treatment;

–        Permeable pavement for stormwater runoff management;

–        High-solids bio-gasification of organic waste for energy recovery; and

–        Methods to assess the biodegradability of organic wastes for bio-fuel production.

Recently Completed Research Projects

  1. Clogging investigation of open graded friction course under heavy vehicle simulator and rainfall simulations.
  2. Methodologies to identify sources of pollutants from highway runoff in Tahoe Basin.
  3. Micro particle (<20 mm) size fractionation and contaminates associated with them.
  4. Clogging investigation of porous asphalt and pervious concrete pavement surfaces.
  5. Methods to measure the permeability of permeable pavements.
  6. Mathematical modeling of pollutograph.
  7. Water quality and toxicity evaluation of leachate produced from open and dense-graded pavement materials.
  8. Hydrographic toxicity evaluation of urban highway runoff.
  9. First flush treatment strategies.
  10. Performance evaluation of detention basin based on the fine particles and toxicity removal.
  11.  Hydraulic simulations of full depth permeable pavements on highway shoulder for stormwater runoff management.
  12.  First flush characteristics of organic and inorganic pollutants generated from urban highway runoff.

Funded Research Proposals (as PI and Co-PI)

  • Application of inclined plate settlers for stormwater runoff treatment (PI)
  • Ammonia toxicity in high-solids anaerobic digestion process (PI).
  • Characterization of California statewide highway runoff from construction sites (Co-PI).
  • Clogging investigation of porous asphalt and pervious concrete pavements in parking lots (PI).
  • Clogging study of open graded porous asphalt under heavy vehicle and rainfall simulations (C0-PI)
  • Comprehensive California statewide highway runoff characterization studies (Co-PI).
  • Computer model to estimate the quality and quantity of biogas from municipal landfills (Co-PI).
  • Continuous on line flow-through particle size measurement (PI).
  • Development of data analysis software to analyze censored water quality data (Co-PI)
  • Evaluating field and laboratory data for developing surrogate indicators to monitor fine sediment in the Tahoe Basin (Co-PI)
  • Guidance for permeable pavement systems (Co-PI)
  • Hydraulic performance evaluation of permeable pavements under heavy traffic and load (PI).
  • Fate of wastewater nitrogen discharged to the aquatic and soil environment (Co-PI).
  • First flush highway runoff characterization (PI)
  • Impact of annual average daily traffic on highway runoff pollutant concentration (PI).
  • Importance of nutrients availability on the performance of high-solid anaerobic digestion (PI).
  • Isotopic approach to identify sources of nitrogen and phosphorus from Tahoe basin (Co-PI).
  • Kinetic model to simulate the biodegradation of a high-solids anaerobic digestion process (PI).
  • Managing biosolids by using the biodegradable organic fraction of MSW as a primary substrate and source of energy in a high-solids anaerobic composting process (PI).
  • Mass balance modeling approach to identify sources of pollution from highway runoff (PI).
  • Mathematical model to predict chemical constituents’ pollutographs (PI)
  • Methods to fractionate particle size distribution and contaminants associated with them (PI).
  • Methods to measure the biodegradability of the organic fraction of municipal solid waste (PI).
  • Micro-particles processing and analysis guidance manual for Tahoe Basin (Co-PI).
  • New method to measure C/N for design and performance evaluation of biogasification (PI).
  • Numerical methodology to define first flush pollutants mass loading (PI).
  • Nutrient requirements for methanogens in high-solids anaerobic digestion (PI).
  • Review of particle size distribution and contaminants associated with them (Co-PI)
  • Source identification of total phosphorus originated from motor oil (PI).
  • Source identification of nitrate and phosphate and fine sediments from highway runoff (PI)
  • Structural performance evaluation of permeable pavements under heavy traffic and load (C0-PI).
  • Technical assistance on stormwater runoff management and BMP treatment (Co-PI)
  • Toxicity evaluation of highway stormwater runoff (PI)
  • municipal solid waste as a fuel supplement in a fluidized bed (PI).
  • Water quality of leachate produced from asphalt and concrete surfacing materials under control laboratory investigations (PI).
  • Utilization of humus produced from anaerobic composting of the biodegradable organic fraction of

Research Funding Sources (over $23,000,000)

  • California Department of Air Resources Board
  • California Department of Health
  • California Department of Transportation (Caltrans)
  • California Energy Commission
  • California Integrated Waste Management Board
  • California Prison Industry (PIA)
  • California Waste Recovery Systems Inc.
  • City of San Diego
  • Delta Diablo Sanitation District
  • Integrated Recycling Inc.
  • Microgen Corporation
  • Minnesota Department of Transportation
  • National Science Foundation
  • Protech Inc.
  • Richmond Sanitary Services
  • UC Davis Academic Federation
  • U.S. Department of Energy
  • U.S. Environmental Protection Agency (USEPA)
  • U.S. Forest Services (USFS)
  • University of California Energy Institute
  • Vector Engineering, Inc
  • Water Environment Federation
  • West County Agency
  • West County Wastewater District
  • Wildermuth Environmental, Inc.

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