Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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    LOW IMPACT DEVELOPMENT MIXTURE EVALUATION FOR HEAVY METAL REMOVAL
    (2019) Liang, Liang; Davis, Allen P.; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    To address non-point heavy metal pollutant sources to urban stormwater runoff, the LIDMATTM (Low Impact Development MAT) is a stormwater management runoff system designed and manufactured for effective treatment for heavy metals. The LIDMATTM contains approximately 70% sand, 25% manure compost, and 5% steel slag by mass. The LIDMATTM was evaluated based on flow rate, pH, heavy metal removal, and the concentrations of N and P leached; conditions for optimum removal have been quantified. For treating synthetic stormwater runoff, 12 trials were completed using bench-scale and column media testing systems. Average effluent event mean concentrations of all trials were 25 ± 10 μg/L Cu, 21 ± 13 μg/L Pb, and 57 ± 42 μg/L Zn from studies at influent concentrations of 500 μg/L, 300 μg/L, and 100 μg/L, which satisfy Numeric Action Levels (NALs) of Cu, Pb, and Zn by the state of California, USA, Industrial General Permit (IGP). The leaching of nitrogen and phosphorous were also below the NALs.
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    The use of hatchery residual biosorbent for removal of heavy metals from wastewater
    (2006-05-23) Paula, Heloisa; Becker, Jennifer G; Davis, Allen P; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The recycling of hatchery wastes could reduce disposal costs for this broiler production residual. Eggshell is abundant in the residual and is composed primarily of calcite, which is known to sorb metals. The uptake of Cd(II), Cu(II), Ni(II), Pb(II), and Zn(II) from aqueous solutions by the residual was investigated, and the underlying mechanisms were characterized in a series of batch and column experiments. The residual's selectivity decreased according to: Pb(II) > Cu(II) > Zn(II) > Cd(II) > Ni(II) and probably can be explained by different removal mechanisms. Compared with a commercial ion exchange resin, treatment columns containing the residual had a relatively low capacity for metals in an electroplating wastewater and regeneration was relatively inefficient. Thus, it may not be practical to use the residual in primary wastewater treatment. Use of the residual in wastewater polishing or as a co-amendment with land-applied biosolids may be more appropriate.