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Articles 211 - 220 of 220

Full-Text Articles in Environmental Engineering

The Effect Of Varying Temperature, Flux And Pretreatment On The Microfiltration Of Lake Michigan Water, Karen Linda Kopp Jan 1997

The Effect Of Varying Temperature, Flux And Pretreatment On The Microfiltration Of Lake Michigan Water, Karen Linda Kopp

Retrospective Theses and Dissertations

This study investigated microfiltration of Lake Michigan Water for the production of drinking water. A 60 gpm Memcor microfiltration pilot plant was operated for nine months at Manitowoc, Wisconsin to determine and model the performance characteristics of a microfiltration pilot plant for varying surface water conditions. Statistical regression and modeling was used to determine and develop quantitative relationships between time of operation and several operational variables for water quality and productivity. Modifications of Darcy's Law and flux decline data were used to develop a model relating temperature and flux to cleaning frequency. Statistical hypothesis testing and associated modeling were used …

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The Effects Of Glucose And Fatty Acids On Enhanced Biological Phosphorus Removal Using A Sequencing Batch Reactor, Tarek Zaki Khouri Jan 1996

The Effects Of Glucose And Fatty Acids On Enhanced Biological Phosphorus Removal Using A Sequencing Batch Reactor, Tarek Zaki Khouri

Retrospective Theses and Dissertations

Two anaerobic/aerobic sequencing batch reactors (SBRs) were used to evaluate enhanced biological phosphorus removal (EBPR). The first SBR, designated the Glucose SBR, was run for a period of four months. It received a synthetic wastewater plus glucose as a supplemental carbon source. The second SBR, the Isovaleric SBR, was run for three months. During the first month, isovaleric acid was its supplemental carbon source while for the remaining time period, no supplemental carbon source was added to the feed. Steady-state data from the SBR receiving isovalerate yielded the highest phosphorus (P) removals observed during the study, with a mixed liquor …

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Consumption And Loss Of Formaldehyde In Electroless Copper Plating, Peter John F. Sutch Jan 1993

Consumption And Loss Of Formaldehyde In Electroless Copper Plating, Peter John F. Sutch

Retrospective Theses and Dissertations

The objectives of this research were to quantify formaldehyde consumption due to plating and parasitic reactions and determine the magnitude and distribution of formaldehyde losses from the electroless copper plating process. Plating and rinse bath samples obtained from three electroless copper plating operations were analyzed for formaldehyde and copper in order to develop a mass balance analysis about the plating bath for periods of active production and no production. Fugitive air and stack releases of formaldehyde were estimated using emission factors developed from air sampling at the three facilities. It was determined that approximately 90% of the formaldehyde added to …

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Phosphorus Accumulation In Bottom Sediments Of Retention/Detention Ponds, Kriss Young Kaye Jan 1993

Phosphorus Accumulation In Bottom Sediments Of Retention/Detention Ponds, Kriss Young Kaye

Retrospective Theses and Dissertations

Laboratory and field studies were conducted to characterize phosphorus in bottom sediments for retention/detention ponds. The laboratory studies, including batch and column experiments, were conducted to assess possible removal processes. Sediment core samples were collected from detention ponds receiving urban runoff. These cores were analyzed for phosphorus at different layers including accumulated top sediments and the lower parent soil beneath it at a depth of 1, 3, 5, 10 and greater than 10 cm. The phosphorus accumulation rate was found to decline with calculated overflow rates from an average storm. Also attenuation of phosphorus with sediment depth followed an exponential …

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Project Smart: A Restoration/Demonstration, Martin Wanielista Dec 1992

Project Smart: A Restoration/Demonstration, Martin Wanielista

BMP Trains Research and Publications

No abstract provided.

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Design Curves For The Reuse Of Stormwater, Martin Wanielista Aug 1992

Design Curves For The Reuse Of Stormwater, Martin Wanielista

BMP Trains Research and Publications

No abstract provided.

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Emissions Of Hexavalent Chromium From Hard Chromium Plating Operations, Mitchell Scott Hall Jan 1992

Emissions Of Hexavalent Chromium From Hard Chromium Plating Operations, Mitchell Scott Hall

Retrospective Theses and Dissertations

This research addresses emissions of hexavalent chromium mist from hard chromium electroplating operations. Most of these emissions are typically captured by a ventilation stack and directed to a pollution control device; those which escape capture are called fugitive emissions. Releases of toxic materials such as hexavalent chromium must be reported annually to the Environmental Protection Agency (EPA) under provisions of the Superfund Amendments and Reauthorization Act (SARA) Title III of 1986 via the Toxic Release Inventory (TRI), Form R. The objectives were: (1) to provide estimates of fugitive hexavalent chromium emissions for the completion of Form R; and (2) to …

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The Enhancemnt Of N-Heptane Vapor Incineration Using Ozone And Hydrogen Peroxide, Michael William Hewett Jan 1991

The Enhancemnt Of N-Heptane Vapor Incineration Using Ozone And Hydrogen Peroxide, Michael William Hewett

Retrospective Theses and Dissertations

Using a narrow bore quartz tube reactor set inside a three zone Lindburg furnace, a measured air stream with a known concentration of n-heptane was heated to temperatures between 637°C and 687°C. A separate measured air stream with known concentrations of ozone was injected just prior to the thermal zone of the reactor. The differences in heptane concentration entering and exiting the reactor under varying time, temperature, and ozone conditions were monitored with a gas chromatograph in an effort to generate kinetic data. The reactor was modeled as a first order plug flow reactor. The constants in the Arrhenius equation …

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Precipitation, Inter-Event Dry Periods, And Reuse Design Curves For Selected Areas Of Florida, Martin Wanielista Jan 1991

Precipitation, Inter-Event Dry Periods, And Reuse Design Curves For Selected Areas Of Florida, Martin Wanielista

BMP Trains Research and Publications

No abstract provided.

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Fate Of Heavy Metals From Highway Runoff In Stormwater Management Systems, Harvey H. Harper Jan 1985

Fate Of Heavy Metals From Highway Runoff In Stormwater Management Systems, Harvey H. Harper

Retrospective Theses and Dissertations

The movement and fate of heavy metal inputs (Cd, Zn, Mn, Cu, Al, Fe, Pb, Ni and Cr) from highway runoff were investigated in a three-year study on 1.3 hectare retention facility near the Maitland Interchange on Interstate 4, north of Orlando, Florida. Physical characteristics of the retention pond and surrounding watershed were defined and field instrumentation was installed. Stormwater samples were collected over a one-year period, representing a wide range of intensities and antecedent dry periods. Stormwater characteristics were compared with average retention pond water quality to determine removal efficiencies for heavy metals within the pond. A total of …

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