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  • Treatment of activated sludge process effluent by carbon adsorption

    Creator:
    Davis, Stewart Lee
    Abstract:
    An evaluation of the service time of an activated carbon adsorption column and the organic carbon removal efficiency treating activated sludge process effluent was completed at aerator detention times of three, five, and ten hours. Parameters used for evaluation of treatment were biochemical oxygen demand, chemical oxygen demand, total organic...
    Resource Type:
    Masters Thesis
    Full Text:
    sewage was demon- strated by a combination of two processes; a biological treatment process and a

  • The effect of elevated pressure on the activated sludge process

    Creator:
    Godsil, Patrick James
    Abstract:
    A study of the effect of elevated pressure on the activated sludge waste treatment process is presented. The method of study involved a comparison of two laboratory, batch type, activated sludge units. One unit was operated at atmospheric pressure as a base control and the other operated at elevated pressures...
    Resource Type:
    Masters Thesis
    Full Text:
    - tion of settled sewage and seed material from an activated- sludge treatment plant and was acclimated

  • The effect of elevated pressure and high shear on oxygen uptake rates in activated sludge

    Creator:
    Streebin, Leale E.
    Abstract:
    The purification capacity of an activated sludge process is highly dependent of the rate of oxygen transfer from the air to the microorganisms. This rate can be increased in an air diffusion system by subjecting the culture to high shear and high pressure. A study of the effects of high...
    Resource Type:
    Masters Thesis
    Full Text:
    SHEAR Abstract approved The purification capacity of an activated sludge process is highly dependent

  • Metabolic uncoupling of Shewanella oneidensis MR-1, under the presence of excess substrate and 3,3’,4’,5 tetrachlorosalicylanilide

    Creator:
    Saini, Gaurav
    Abstract:
    Dissociation between catabolism and anabolism, generically termed “metabolic uncoupling”, has been studied for aerobic cultures of Shewanella oneidensis MR-1. Under conditions promoting metabolic uncoupling, the cell yield diminishes while the substrate utilization rate remains largely unchanged. The effects of excess substrate conditions and TCS addition on the metabolism of pyruvate...
    Resource Type:
    Masters Thesis
    Full Text:
    , Eikelboom DH, Fan YB. 2003. Minimization of excess sludge production for biological wastewater treatment

  • Flow characteristics of constructed wetlands : tracer studies of the hydraulic regime

    Creator:
    Stairs, Darrin B.
    Abstract:
    Treatment efficiency in a constructed wetland is related in part to the amount of time that a wastewater remains in the system. Current design methods idealize the system as a plug flow reactor and use a "residence time" based solely on the volume of the cell and the flow rate....
    Resource Type:
    Masters Thesis
    Full Text:
    kinetics often receive the most attention. The efficiency of biological treatment is partly dependent on

  • Hydraulic characterization and modeling of the Talking Water Garden wetland for evaluation of nitrogen removal

    Creator:
    Huang, Tao
    Abstract:
    The purpose of this research is to hydraulically characterize an engineered wetland in Albany, Oregon. The wetland receives treated wastewater from both Albany Millersburg Water Reclamation Facility (AMWRF) and ATI Wah Chang. AMWRF's water is municipal waste water. ATI Wah Chang's water comes from its nearby metal processing plant. The...
    Resource Type:
    Masters Thesis
    Full Text:
    Chemical Engineering Head of the School of Chemical, Biological, and Environmental Engineering

  • The effect of silver ions and nanoparticles on biofilms and planktonic cultures of Nitrosomonas europaea

    Creator:
    Giska, Jonathan R.
    Abstract:
    Due to the effective antimicrobial properties of silver nanoparticles they represent a significant proportion of all consumer-­‐related nanomaterials. The introduction of silver nanoparticles from these products into domestic and industrial wastewater streams poses potential complications for biological treatment systems. A critical component of biological treatment that is extremely sensitive to...
    Resource Type:
    Masters Thesis
    Full Text:
     treatment  systems.  A  critical   component  of  biological  treatment  that  is

  • Inhibition of the ammonia oxidizing bacteria Nitrosomonas europaea by the emerging contaminant triclosan

    Creator:
    Hughes, Jamie L.
    Abstract:
    Identifying the inhibition of ammonia oxidizing bacteria (AOB) by emerging organic contaminants is crucial due to the importance of AOB in wastewater treatment, the widespread use of antibacterial agents such as triclosan (TCS) in consumer products, and the sensitivity of N. europaea to inhibitors. Triclosan inhibition of nitrification by AOB...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................................................... 5 2.2. Biological Nitrification in Wastewater Treatment

  • Effect of plant surface area on organic carbon removal in wetlands

    Creator:
    Kuehn, Elaine Jinx
    Abstract:
    This study investigated the effect of plant surface area (plant density) on the efficiency of organic carbon removal in a bench-scale constructed wetland. Constructed wetlands are commonly assumed to be biofilm reactors in which organic carbon removal occurs primarily through sedimentation and aerobic degradation by attached microbial biofilms. In conventional...
    Resource Type:
    Masters Thesis
    Full Text:
    , while plant biofilm surface areas are assumed to be the major treatment mechanism for biological

  • Temperature and infiltration characterization of a constructed wetland for wastewater treatment

    Creator:
    Gregory, Christopher T.
    Abstract:
    The City of Woodburn, Oregon's Wastewater Treatment Plant (WWTP) has been investigating several natural alternatives for improving effluent quality. Based on its current National Pollution Discharge Elimination System (NPDES) permit, the WWTP will require additional reduction of temperature and ammonia levels in the summer, especially in the critical month of...
    Resource Type:
    Masters Thesis
    Full Text:
    Wastewater Treatment Abstract approved: John S. Selker