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Full-Text Articles in Engineering
Occurrence And Proliferation Of Antibiotics And Antibiotic Resistance In Wastewater Treatment Plants, Majid Neyestani
Occurrence And Proliferation Of Antibiotics And Antibiotic Resistance In Wastewater Treatment Plants, Majid Neyestani
UNLV Theses, Dissertations, Professional Papers, and Capstones
Solids retention time (SRT) is one of the most important factors in designing and operating activated sludge systems for biological wastewater treatment. Longer SRTs have been shown to alter the structure and function of microbial communities, thereby leading to improved treatment efficacy with respect to bulk and trace organics, nutrient removal, and membrane fouling. However, research has also shown that longer SRTs lead to increased prevalence of antibiotic resistant bacteria, perhaps due to increased exposure to antibiotics present in influent wastewater. The purpose of this study was to characterize changes in microbial community structure in a laboratory-scale activated sludge system …
Removal Of Target Ppcps From Secondary Effluent Using Aops And Novel Adsorbents, Venkateswara Reddy Kandlakuti
Removal Of Target Ppcps From Secondary Effluent Using Aops And Novel Adsorbents, Venkateswara Reddy Kandlakuti
Electronic Thesis and Dissertation Repository
Atenolol (β-blocker), Clofibric Acid (Lipid regulators) and Diclofenac (Anti-inflammatory) are the drugs widely used and reported to have adverse effects on fish and other organisms. These drugs are found at trace levels in lakes, rivers and sewage treatment plants and conventional treatment plants are ineffective to eliminate these at those levels. A high resolution LC-MS/MS was used to quantify these drugs at low levels. Various advanced oxidation methods were used for the present research to eliminate these drugs from secondary effluent. Complete removal of PPCPs was achieved by synthesizing immobilized TiO2 on a stainless steel mesh and using a combination …
Development Of A Decentralized And Off-Grid Anaerobic Membrane Bioreactor (Anmbr) For Urban Sanitation In Developing Countries, Robert Alonso Bair
Development Of A Decentralized And Off-Grid Anaerobic Membrane Bioreactor (Anmbr) For Urban Sanitation In Developing Countries, Robert Alonso Bair
USF Tampa Graduate Theses and Dissertations
Urbanization has led to rapid and uncontrolled growth of informal housing settlements in many developing countries. As most slum growth is unplanned, these areas tend to lack basic infrastructure including sanitation. The high user rates, lack of water and electricity infrastructure, space limitations, and scant financial resources make sanitation provision a major challenge in slums. As most decentralized sanitation technologies fail when applied in these environments, better technologies need to be developed that cater to the specific needs of slum dwellers. One promising technology, the membrane bioreactor (MBR) is routinely used in developed countries when a compact and resilient treatment …
Potential For Biofuel Production From Algae Based Wastewater Treatment In California: Can Algal Biofuels Be Cost-Competitive With Traditional Petroleum Based Diesel?, Amanda Rupiper
Master's Projects and Capstones
Neither the use of algae to clean wastewater, nor the use of photosynthetic organisms to generate biodiesel, are new concepts on their own. By combining these two processes, algal-based wastewater treatment with algal biofuel production, additional benefits can be derived, among which could be a cost-savings. In California the average estimated base production cost per gallon for algal biodiesel is $5.98/gallon. Compared to the adjusted production cost of petroleum-based diesel of $1.53/gallon, biodiesel is not cost-competitive. Coupling wastewater treatment and algal cultivation reduces the net energy use of the two processes separately and, if accounted for, greatly reduces the production …
Ozonation In Water Reuse: Formation And Mitigation Of N-~Nitrosodimethylamine, Erica J. Marti
Ozonation In Water Reuse: Formation And Mitigation Of N-~Nitrosodimethylamine, Erica J. Marti
UNLV Theses, Dissertations, Professional Papers, and Capstones
Formation of N-nitrosodimethylamine (NDMA) is a substantial concern for drinking water and water reuse. NDMA, a probable human carcinogen, is formed when water is disinfected with chloramines and ozone. This research focused on three issues regarding NDMA formation and mitigation. The first issue involved understanding the compounds (i.e., precursors) present in water and wastewater that react with ozone to form NDMA. Model precursors were identified and molar yields for NDMA formation were determined. The model precursors form high amounts of NDMA with ozone, but form very little NDMA with chloramines, which means there are two distinct groups of NDMA precursors: …
Treatment Of Dissolved Metals For Direct Potable Reuse, Cesar Alberto Alvarez
Treatment Of Dissolved Metals For Direct Potable Reuse, Cesar Alberto Alvarez
Open Access Theses & Dissertations
In the process of direct potable reuse (DPR), the bulk of the removal of dissolved metals removal is accomplished by reverse osmosis. This treatment is especially important in wastewater containing contaminants from industrial processes. The goal of this research was to evaluate the performance of DPR with respect to the removal of salinity and dissolved metals to meet drinking standards. Samples were collected from the El Paso Water Utilities Advanced Water Purification pilot system throughout various points in the treatment process. The samples were analyzed for their concentration of ions with Ion Chromatography (IC) and dissolved metals using an Inductively …