A5101448424- Wastewater Treatment and Nitrogen Removal
- Constructed Wetlands for Wastewater Treatment
- Membrane Separation Technologies
- Water Treatment and Disinfection
- Carbon Dioxide Capture Technologies
- Anaerobic Digestion and Biogas Production
- Water Quality and Resources Studies
- Microbial Fuel Cells and Bioremediation
- Wastewater Treatment and Reuse
- Water Quality Monitoring and Analysis
- CO2 Sequestration and Geologic Interactions
- Catalytic Processes in Materials Science
- Groundwater and Isotope Geochemistry
- Geology and Paleoclimatology Research
- Electrokinetic Soil Remediation Techniques
- Soil Geostatistics and Mapping
- Gyrotron and Vacuum Electronics Research
- Fluid Dynamics and Mixing
- Space Exploration and Technology
- Adsorption and biosorption for pollutant removal
- Advanced Research in Systems and Signal Processing
- Marine and fisheries research
- Cyclone Separators and Fluid Dynamics
- Urban Stormwater Management Solutions
- Geochemistry and Elemental Analysis
Brown and Caldwell (United States)
2017-2022
Virginia Tech
2012-2015
Benchmark Research (United States)
2004-2010
Wisconsin Disability Association
1994
Texas A&M University
1994
University of Guelph
1994
Orbital ATK (United States)
1984
Realistic models of past climate and ocean chemistry depend on reconstructions the Earth's surface environments in geologic past. Among critical parameters is makeup continental drainage. Here we show, for present, that isotope composition dissolved strontium rivers increases linearly with age bedrock drainage basins, notable exception area Arabia, India, Southeast Asia affected by unusually radiogenic Sr from Himalaya. We also demonstrate neodymium compositions suspended matter as well...
This paper deals with an almost 1-year long pilot study of a nitritation-denitritation process that was followed by anammox polishing. The plant treated real municipal wastewater at ambient temperatures. effluent high-rate activated sludge (hydraulic retention time, HRT=30 min, solids time=0.25 d) fed to the described in this paper, where constant temperature 23 °C maintained. operated promote nitrite oxidizing bacteria out-selection intermittently aerated reactor. intermittent aeration...
Abstract The wastewater industry is currently facing dramatic changes, shifting away from energy-intensive treatment towards low-energy, sustainable technologies capable of achieving energy positive operation and resource recovery. latter will shift the focus to how one could manage extract resources wastewater, as opposed conventional paradigm treatment. Debatable questions arise: can more complex models be calibrated, or additional unknowns introduced? After almost 30 years using...
This work describes the development of an intermittently aerated pilot-scale process (V = 0.45 m(3) ) operated for optimized efficient nitrogen removal in terms volume, supplemental carbon and alkalinity requirements. The intermittent aeration pattern was controlled using a strategy based on effluent ammonia concentration set-points. unique feature ammonia-based control that fixed dissolved oxygen (DO) set-point used length aerobic anoxic time (anoxic ≥25% total cycle time) were changed...
This study describes the development of a modified activated sludge model No.1 framework to describe organic substrate transformation in high-rate (HRAS) process. New process mechanisms for dual soluble utilization, production extracellular polymeric substances (EPS), absorption (storage), and adsorption colloidal were included model. Data from two HRAS pilot plants investigated calibrate validate proposed systems. A subdivision readily biodegradable into slow fast fraction allow accurate...
ABSTRACT As nitrogen discharge limits are becoming more stringent, short‐cut systems and tertiary polishing steps gaining popularity. For partial nitritation or nitritation–denitritation systems, anaerobic ammonia oxidation (anammox) may be feasible to remove residual nitrite from the effluent. Nitrogen of mainstream system effluent via anammox was studied at 25°C in a fully anoxic moving bed bioreactor (MBBR) ( V = 0.45 m 3 ) over 385 days. Unlike other based processes, very fast startup...
The pursuit of fully autotrophic nitrogen removal via the anaerobic ammonium oxidation (anammox) pathway has led to an increased interest in carbon technologies, particularly A-stage adsorption/bio-oxidation (A/B) process. high-rate operation and lack automatic process control often results wide variations chemical oxygen demand (COD) that can ultimately impact downstream B-stage This study evaluated use dissolved (DO) mixed liquor suspended solids (MLSS) based strategies through situ...
The Water Environment Research Foundation (WERF) funded a two-year comprehensive study of nutrient removal plants designed and operated to meet very low effluent total nitrogen (TN) phosphorus (TP) concentrations. WERF worked with the Federation (WEF) solicit participation volunteers provide forum for information exchange at workshops its annual conferences. Both existing new technologies are being adapted requirements that as 3.0 mg/L TN 0.1 TP, there is need define their capabilities...
In high-rate activated sludge (HRAS) systems, extracellular adsorption and intracellular storage have been referred to as the dominant mechanisms for capturing organic carbon from wastewater. However, quantification of products under short retention time (SRT) HRAS systems has rarely studied. Since measurement is complex dependent on several variables, alternative solutions substrate removal through are required understand system's capture efficiency. To overcome complexity experimentally,...
We quantitatively analyze the area‐age distribution of sedimentary, igneous and metamorphic bedrock based on data from most recent digital geologic maps East Southeast Asia ( Coordinating Committee for Coastal Offshore Geosciences Programmes in (CCOP) Geologic Survey Japan , 1997; 1:2,000,000), published as Digital Geoscience Map G‐2 by Geological Japan. Sedimentary rocks, volcanic plutonic ultramafic rocks cover 73.3%, 8.5%, 8.8%, 0.9%, 8.6% surface area, respectively. The average ages...
Mathematical Modeling of Carbon Removal in the High-Rate Activated Sludge System: Model Presentation and ApplicationThis paper discusses development a modified ASM1 model to better describe overall removal organic substrate from high-rate activated sludge (HRAS) processes. This will include process mechanisms for flocculation particulate colloidal substrate, hydrolysis, production extracellular polymeric substances (EPS). Consideration has also been given the...Author(s)Thomas M. NogajAndrew...
The magnitude of A-stage effluent particulate COD correlated negatively with B-stage NOB rate during fully intermittent aeration. This was likely due to heterotrophic competition for nitrite