Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"external carbon"”.
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Evaluation of gasoline-denatured ethanol as a carbon source for wastewater denitrification
Methanol (MeOH) is a common external carbon source for wastewater denitrification, because of its low cost and low sludge yield. Ethanol (EtOH), on the other hand, is more expensive, but yields higher denitrification rates. This study introduces gasoline-denatured ethanol (dEtOH), which is now …
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Ripening behaviour of capsicum (Capsicum annuum L.) fruit.
… including internal ethylene (C2H4) and carbon dioxide (CO2) concentration, extractable colour, 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and oxidase activity, and total soluble solid content (TSSC) were studied during storage. There was very limited involvement of C2H4 during …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
… landowners. This thesis investigated the use of external carbon dosing in bioreactors to improve nitrate removal and quantified some potential adverse effects of carbon dosing on bioreactors and downstream aquatic environments. Through observations ranging from field to mesocosm experiments, this …
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COMMUNITY ANALYSIS OF A UNIQUE FULL-SCALE WASTEWATER TREATMENT PLANT AS REVEALED BY 454-PYROSEQUENCING
… flow and utilizes glycerin as a supplemental carbon source due to low-strength carbon influent. In addition, the plant experienced an upset in 2012 with respect to excessive tardigrade growth. In response introduced sludge from another wastewater treatment plant (seed event) to help improve …
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Low temperature biological treatment of a high ammonia municipal landfill leachate
… ratio of 6:1 (60 l/d). Methanol was used as an external carbon source for denitrification. Additional phosphorus was added for bacterial growth. Temperatures of 20°C, 12°C and 4°C were studied. Theoretical aerobic SRTs of 20 days and 60 days were operated in system I; theoretical aerobic SRTs of …
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Biological transformation of 2,4-dinitrotoluene under denitrifying conditions
… transformed by both cultures when an external carbon source was supplied. Initial transformations were reductive, with the transient accumulation of 2-amino-4-nitrotoluene, 4-amino-2-nitrotoluene, and 2,4-diaminotoluene. In addition, formation of 2-nitrotoluene and 4-nitrotoluene …
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Grounded by the prices : Internal carbon pricing as a means to reduce corporate air travel
… large companies use mechanism called internal carbon pricing (ICP) as a means to voluntarily reduce their emissions, when there is no external carbon pricing by the regulator, or such price is deemed insufficient to deliver the level of emission reductions a company wants to achieve. With ICP …
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Optimizing Enhanced Biological Phosphorus Removal at WRRFs: Impact of Low DO Operation and Full-Scale Strategies
… of denitrification fueled by internally stored carbon in the post-anoxic zone were found to co-occur with elevated PAO activity, and subsequent batch tests indicated post-anoxic phosphorus uptake rates ranging from 3 to 40 percent of the aerobic phosphorus uptake rates. Removing the aerobic …
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Evaluation of Alternative Electron Donors for Denitifying Moving Bed Biofilm Reactors (MBBRs)
… Methanol has clearly been the most commonly used external carbon source for post-denitrification processes due to low cost and effectiveness. However, with the requirement for more US wastewater treatment plants to reach effluent total nitrogen levels approaching 3 mg/L, alternative electron …
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Investigation of Hexavalent Chromium Reduction by Aerobic Bacteria in Water and Soil
… one day of curing without the addition of an external carbon source. At an addition of 500 mg/kg Cr(VI), 60% of Cr(VI) was reduced in the sterilized soil within 5 days with 10% (w/w) peptone added, while around 22% Cr(VI) reduction was achieved in the sterilized soil without peptone added. …
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Startup Strategies for Mainstream Anammox in Moving Bed Biofilm Reactors (MBBRs)
… nitrogen removal technology with significant carbon and aeration savings when compared with conventional nitrification/denitrification. Yet despite these benefits, the use of PdNA in mainstream wastewater treatment remains limited. One of the main barriers to implementation of anammox-based …
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Investigating upflow biofiltration using the Biostyr process by varying the organic strength of the influent
… Thus, it was determined that the addition of an external carbon source would need to be implemented to denitrify when using low strength secondary effluent. Effluent total suspended solids were consistently below 20 mg/L indicating that secondary clarification would not be needed for this reactor …
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Seasonal influent characterization, model calibration, SRT and energy usage for nitrogen removal at a full scale wastewater plant
… acceptor (in the absence of oxygen) and organic carbon as an electron donor (commonly measured as chemical oxygen demand, or COD). The availability of sufficient COD is commonly the limiting factor for denitrification at many wastewater plants, with some plants having to purchase external carbon …
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Startup and Pilot Testing of MBBR and IFAS Partial Denitrification/Anammox Processes
… ammonia. PdNA provides significant aeration and external carbon savings when compared to the conventional nitrification/denitrification biological removal process for nitrogen but has been difficult to implement in mainstream treatment conditions due to many factors. One of these factors is the …
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Deammonification Process Kinetics and Inhibition Evaluation
… to remove up to 85% of nitrogen load without external carbon source addition. The anammox process is combined with another process that oxidizes half of the ammonia to nitrite (nitritation) in a separate reactor such as in the SHARON process, or in the same reactor such as in the …
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Experimental testing and modeling of partial nitrification at different temperatures
… high energy for nitrification and require external carbon for denitrification. Alternatively, partial nitrification is of interest as an emerging technology for its lower need of organic carbon addition and cost savings in aeration. In this study, the main objectives are: 1- developing a …