Engineering Commons^™

Lead Corrosion Inhibitors In Drinking Water, Seyedsoheil Hosseinibalajadeh

Theses and Dissertations

Lead-containing materials that include lead pipes, fittings, solder, and fixtures are widely present in drinking water distribution systems in North America and Europe. Their internal corrosion provides the most significant source of lead in drinking water. Several mechanisms contribute to the corrosion of lead-containing materials, including material heterogeneity, galvanic interaction, and reaction with progressively water constituents and to protect consumers from lead exposure, the Lead and Copper Rule (LCR) set the lead action level to 15 μg/L for a 1-L first-draw sample of tap water. Today more than half of the water treatment utilities in the U.S. are using phosphates …

The Role Of Solution Chemistry And Cell Surface Properties In Mediating Bacterial Transport And Deposition In Porous Media And Interactioin With Nanomaterials, Lixia Wang

Theses and Dissertations

Groundwater is an important source for drinking water supply. Microbial contaminants have been implicated in two-third of the waterborne disease outbreak. Understanding the fundamental processes, the governing factors and the interfacial interactions that contribute to the deposition of microbial contaminants to porous media will help to elucidate the microbial attachment/transport profile and is highly needed for bioremediation in the environment as well as water purification industry.

In this study, the effects of (1) chemical factors including ionic strength, pH and concentration of phosphate, (2) biological factors including lipopolysaccharide (LPS), biofilm and biofilm extracellular polysaccharide (EPS), and strain type on E.coli …

Effects Of Phosphate On The Transport Of Escherichia Coli In Saturated Quartz Sand, Nan Chen

Theses and Dissertations

Bacterial deposition and survival in porous media is a crucial phenomenon in various environmental processes including bioremediation, water treatment, and pathogen contamination. The fate of bacteria in porous media may be greatly influenced by ionic strength and phosphate. Although phosphate is widespread in the natural environment, the influence of phosphate on the transport of three strains of ESCHERICHIA COLI O157:H7 cells in the groundwater system remains unknown.

Experiments were performed in saturated sand packed columns with and without phosphate to examine the transport of bacteria, deposition rate coefficient, interaction energy between bacteria and sand, and bacteria surface charge.

Experimental results …