A5070559310- Wastewater Treatment and Nitrogen Removal
- Constructed Wetlands for Wastewater Treatment
- Wastewater Treatment and Reuse
- Phosphorus and nutrient management
- Water Treatment and Disinfection
- Membrane Separation Technologies
- Microbial Fuel Cells and Bioremediation
- Ammonia Synthesis and Nitrogen Reduction
- Soil and Water Nutrient Dynamics
- Anaerobic Digestion and Biogas Production
- Odor and Emission Control Technologies
- Water-Energy-Food Nexus Studies
- Hybrid Renewable Energy Systems
- Enhanced Oil Recovery Techniques
- Process Optimization and Integration
- BIM and Construction Integration
- Innovative Microfluidic and Catalytic Techniques Innovation
- Atmospheric and Environmental Gas Dynamics
- Iron and Steelmaking Processes
- Tracheal and airway disorders
- Landfill Environmental Impact Studies
- Environmental Engineering and Cultural Studies
- Water Quality Monitoring Technologies
- Advanced Power Generation Technologies
- Integrated Water Resources Management
District of Columbia Water and Sewer Authority
2015-2024
John Wiley & Sons (United States)
2019-2021
Hudson Institute
2019-2021
Abstract In this study, concurrent operation of anammox and partial denitrification within a nonacclimated mixed culture system was proposed. The impact carbon sources (acetate, glycerol, methanol, ethanol) COD / NO 3 − ‐N ratio on selection under both short‐ long‐term operations investigated. Results from short‐term testing showed that all supported denitrification. However, acetate glycerol were preferred due to their display efficient selection, which may be related different electron...
Despite the increased research efforts, full-scale implementation of shortcut nitrogen removal strategies has been challenged by lack consistent nitrite-oxidizing bacteria out-selection. This paper proposes an alternative path using partial denitrification (PdN) selection coupled with anaerobic ammonium-oxidizing (AnAOB). A nitrate residual concentration (>2 mg N/L) was identified as crucial factor for metabolic PdN acetate a carbon source, unlike COD/N ratio which often suggested....
This research examined the feasibility of raw fermentate for mainstream partial denitrification-anammox (PdNA) in a pre-anoxic integrated fixed-film activated sludge (IFAS) process. Fermentate quality sampled from full-scale facility was highly dynamic, with 360-940 mg VFA-COD/L and VFA/soluble COD ratios ranging 24% to 48%. study showed that PdNA selection could be achieved even when using low fermentate. Nitrate residual identified as main factor driving PdN efficiency, while management...
Abstract Primary sludge fermentate, a concentrated hydrolyzed wastewater carbon, was evaluated for use as an alternative carbon source mainstream partial denitrification–anammox (PdNA) in suspended growth activated process terms of denitrification (PdN) efficiency, PdNA nitrogen removal contributions, and final effluent quality. Fermenter operation at 2‐day retention time (SRT) resulted the maximum achievable yield 0.14 ± 0.05 g sCOD/g VSS without release excessive ammonia phosphorus to...
We demonstrate the potential of partial denitrification-anammox filters to retrofit plants into sustainable and cost-effective nitrogen removal systems.
Retrofitting conventional denitrification filters into partial denitrification-anammox (PdNA)- or anammox (AnAOB)-based will reduce the needs for external carbon addition. The success of AnAOB-based depends on growth and retention within such filters. Studies have overlooked importance media selection its impact AnAOB capacity, head loss progression dynamics, shear conditions applied onto biofilm. objective this study was to evaluate viable types (10 types) that can enhance rates efficient...
This study focused on evaluating the feasibility of expanded clay and sand as media types for mainstream partial denitrification-anammox (PdNA) in deep-bed single-media polishing filters under nitrogen solids loading rates well backwash conditions similar to conventional denitrification filters. The surface roughness iron content were hypothesized allow enhanced anammox retention, removal rates, runtimes. However, tested conditions, no clear benefit was observed compared with sand. showed...
Deep-bed denitrification filters have been successfully used for over 25 years to meet total nitrogen (TN) limits of 3 mg/L and even lower. In some cases, the wastewater treatment plants (WWTPs) also had moderate phosphorus (TP) limits, in range 0.5 2 mg/L. More recently, WWTPs are required very low TN TP simultaneously. For example, as result development maximum daily loads (TMDL) Chesapeake Bay, many Maryland Virginia will be 0.3 on a 12-month average basis. A number these more stringent...
Abstract The thermal hydrolysis process (THP) is applied to enhance biogas production in anaerobic digestion (AD), reduce viscosity for improved mixing and dewatering sterilize cake solids. Large heat demands steam rely on dynamic effects like sludge throughput, gas availability THP parameters. Here, we propose a combined energy model suitable describe the behaviour of full-plant context. addresses interactions with operational conditions covered by AD obeying mass continuity. Energy...
The impact of methanol (CH3OH) as a source anthropogenic carbon dioxide (CO2) in denitrification at wastewater treatment plants (WWTPs) has never been quantified. CH3OH is the most commonly purchased for sewage denitrification. Until recently, greenhouse gas (GHG) reporting protocols consistently ignored liberation CO2 attributable to CH3OH. This oversight can likely be attributed simplifying notion that produced through activated-sludge-process respiration biogenic because raw-sewage...
High-rate activated sludge (HRAS) systems suffer from high variability of effluent quality, clarifier performance, and carbon capture. This study proposed a novel control approach using bioflocculation boundaries for wasting strategy to enhance quality stability while still meeting capture goals. The were developed based on the oxygen uptake rate (OUR) ratio between contactor stabilizer (feast/famine) in high-rate contact stabilization (CS) system this OUR was used manipulate setpoint....
Full-Plant Deammonification for Low-Energy, Low-Carbon Nitrogen RemovalThe successful application of full-plant deammonification could save wastewater utilities hundreds millions dollars in aeration and external carbon costs the life cycle. Even most efficient treatment designs with energy recovery systems usually do not yet achieve energy-neutral conditions. This paper describes an or even energy-positive treatment...Author(s)Maureen O'ShaughnessyBernhard WettCharles BottSudhir...
This project included evaluation of operational practices and performance results for wastewater treatment plants designed to meet very low effluent total phosphorus (TP) concentrations. As stringent limits 0.1 mg/L lower are becoming more common, there is a need better understand factors impacting the sustainability operating these limits. effort focuses on maximizing what can be learned from existing facilities help utilities operate sustainably while achieving necessary level...
PRACTICAL CONSIDERATIONS FOR DESIGN OF A STEP-FEED BIOLOGICAL NUTRIENT REMOVAL SYSTEMAs the need to retrofit secondary treatment plants for biological nutrient removal (BNR) has become widespread, process variations such as step-feed BNR have been developed adapt existing facilities meet effluent requirements. Since there are relatively few full-scale installations of BNR, and design concepts still under development. Although...Author(s)Luis CarrioFred StreettKieth MahoneyChristine...
Pilot testing of upflow continuous backwash filter (UCB) for tertiary denitrification and phosphorus removal was conducted at the Hagerstown wastewater treatment plant. The pilot to determine performance capabilities filters under cold weather operation low effluent total nitrogen (TN) limits. As part a state-wide strategy meeting nutrient reduction goals Chesapeake 2000 Agreement with U.S. Environmental Protection Agency other Bay watershed states, State Maryland is requiring all WWTPs >...
The Paradigm Shift: Wastewater Plants to Resource PlantsContinued use of the term “wastewater plants” maintains stigma waste rather than promoting resource opportunities not only for utilities but surrounding communities. Population growth in combination with finite water resources, energy limitations, limited long nutrient supplies and stressed finances require emphasis on recovery water,...Author(s)Cindy Wallis-LagePatricia ScanlanChristine deBarbadilloJames BarnardAndrew ShawStephen...