Dissertations / Theses on the topic 'Nitrogen removal'
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Ahlin, Björn T. I. "Nitrogen Removal in a Vacuum Tank Degasser : An Investigation on the Nitrogen Removal Performance." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256066.
Full textFörändringar till följd av HYBRIT projektet kommer påverka SSAB Oxelösunds stålverk. Masugn och LD konverter skall ersättas med ljusbågsugns teknologi. Ett problem till följd av detta är kvävehalter i stålet. Enligt litteraturen är kvävehalterna betydligt högre i stål tappat från en ljusbågsugn. Med kvävehalter runt 60-70 ppm jämfört med stål tappat från en LD konverter som har kvävehalter kring 25 ppm. Därför krävdes en undersökning kring kvävereningpotentialen för SSAB Oxelösunds vakuum tank avgasare. Industriella experiment med minskad slaggmängd jämfört med standard praxis blev utförda. Detta utfördes med tanken att minskad slaggmängd skulle ge en större effektiv reaktionsarea. Intentionen var att utföra försök först med halverad slaggmängd följt av slaggfria försök. Dock, på grund av produktions praktiska problem vid verket blev försöken avbrutna. Som en följd av detta blev bara försök med halverad slaggmängd utförda och jämförda med processdata från standard praxis. Kvävereningsberäkningar på historisk processdata utfördes. En parameter som representerade genomsnittlig reaktionshastighet, vilken beror på den effektiva reaktionsarea blev erhållen, validerad och senare applicerad på ett hypotetiskt framtida scenario. Resultaten indikerar att minskad slaggmängd har en positiv inverkan på den effektiva reaktions arean och till följd av detta även en positiv inverkan på kväverening. Dock är för få försök utförda för att kunna fastställa detta. De slutsatser som dras är att vakuum anläggningen vid SSAB Oxelösund har möjligheten att, med förlängd vakuumbehandlingstid, rena de ökade kvävehalter till nivåer runt 20-30 ppm. Ytterligare slutsatser var att ytaktiva element, såsom syre och svavel, i stålet har en stor negativ påverkan för kväverening. Samt att den effektiva reaktionsarean är av stor betydelse för kväverening. Därför bör ansträngningar tas för att minska koncentrationen av ytaktiva element samt att försöka göra den effektiva reaktionsarean så stor som möjligt. Slutligen fastställdes det att ytterligare studier är nödvändiga för att öka kunskapen kring förebyggande tekniker och reningstekniker för kväveföroreningar i stål.
Lingaraju, Bala P. "Removal of Nitrogen from Wastewater Using Microalgae." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321888338.
Full textSamuelsson, Pär. "Control of Nitrogen Removal in Activated Sludge Processes." Doctoral thesis, Uppsala University, Department of Information Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5903.
Full textMore stringent requirements on nitrogen removal from wastewater are the motivation for this thesis. In order to improve treatment results and enhance cost-efficient operation of wastewater treatment plants, model based control strategies are presented.
A Java based simulator for activated sludge processes (JASS) is presented. The graphical user interface, educational experiences and implemented control strategies are discussed.
Controlling the addition of an external carbon source is the next topic discussed. A simple model based feedforward controller is derived and evaluated in a simulation study. The controller attenuates process disturbances quickly. Further, two feedforward controllers for adjusting the aeration volume in activated sludge processes are derived. The aim of the volume control strategies was to efficiently dampen the impact of process disturbances without using an excessively high dissolved oxygen concentration. The simulation results are promising and show that the aeration volume may be a feasible control variable.
A linearisation method for static input non-linearities is presented. The method gives essentially the same result as the existing standard method, but possesses some implementational advantages. The method is used to linearise the non-linear oxygen transfer function of an activated sludge process in an application study.
Multivariable interactions in a process model describing nitrate removal in an activated sludge process are studied using the well known RGA method as well as a relatively novel tool based on Hankel norms. The results of the analysis are compared to conclusions drawn from common process knowledge and are used to design a multivariable control strategy. It was found that process disturbances may be rejected faster using multivariable control.
Finally, the operational costs of the denitrification process are investigated and visualised graphically. Cost optimal regions are found by a numerical grid search. Procedures for controlling the denitrification process in a cost-efficient way are described.
Herrman, Kyle S. "Mechanisms controlling nitrogen removal in agricultural headwater streams." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1181667344.
Full textYan, Qingmei, and 嚴慶梅. "Biological nitrogen removal of saline wastewater by ammoniumoxidizers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42182116.
Full textTOCCO, GIAIME. "Autotrophic Nitrogen Removal From High Ammonium Containing Wastewater." Doctoral thesis, Università degli Studi di Cagliari, 2019. http://hdl.handle.net/11584/260406.
Full textStocks, Justine L. "Enhancement of Two Passive Decentralized Biological Nitrogen Removal Systems." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7093.
Full textGkiouzepas, Stylianos. "Nitrogen and phosphorous removal from groundwater using waste materials." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27454.
Full textTakach, Tibor. "Total nitrogen removal using a pure-oxygen predenitrification configuration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35086.pdf.
Full textKosari, Fatemeh. "Nitrogen removal from wastewater through partial nitrification/ Anammox process." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36921.
Full textTiefenau, Börge Mike. "Is phosphorus limiting the nitrogen removal in constructed wetlands?" Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-26257.
Full textBanjade, Sarita. "Anaerobic / Aerobic Digestion for Enhanced Solids and Nitrogen Removal." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/36128.
Full textThis study was designed to investigate the performance of anaerobic-aerobic-anaerobic digestion of sludge and compare it to anaerobic-aerobic digestion and single stage mesophilic digestion of sludge. Experiments were carried out in three stages: Single-stage mesophilic anaerobic digestion (MAD) 20d SRT; Sequential Anaerobic/Aerobic digestion (Ana/Aer); and Anaerobic/Aerobic/Anaerobic digestion (An/Aer/An). The Anaerobic/Aerobic/Anaerobic digestion of sludge was studied with two options to determine the best option in terms of effluent characteristics. The two sludge withdrawal options were to withdraw effluent from the anaerobic digester (An/Aer/An â A) or withdraw effluent from the aerobic digester (An/Aer/An â B). Different operational parameters, such as COD removal, VS destruction, biogas production, Nitrogen removal, odor removal and dewatering properties of the resulting biosolids were studied and the results were compared among different processes.
From the study, it was found that An/Aer/An â B (wastage from aerobic reactor) provided better effluent characteristics than An/Aer/An â A (wastage from anaerobic reactor), Ana/Aer or conventional MAD. The study also shows that the Anaerobic/Aerobic/Anaerobic (An/Aer/An, with wastage from the aerobic or anaerobic digester) digestion of the sludge can improve the biosolids quality by improving the dewatering capabilities, with lower optimum polymer dose, reduced CST and increased cake solid concentration, and reduce the odor generation from the biosolids.
Both An/Aer/Ana â A and An/Aer/An â B gave 70% VS removal, compared to 50% with single MAD and 62% with only Ana/Aer. COD removal of both An/Aer/An â A and An/Aer/An â B was 70%, while it was 50% and 66% for single MAD and Ana/Aer respectively. In the aerobic reactors of Ana/Aer and An/Aer/An - B, nitrification and denitrification with removal of nitrogen was observed. The An/Aer/An â B system had more ammonia and TKN removal (70%) than Ana/Aer (64%).
The effluent from each stage was analyzed for dewatering ability, cake solid concentration and odor production potential. Compared with a single Ana/Aer system, the extra anaerobic step in An/Aer/An â A and â B reduced polysaccharides in the effluent. The Ana/Aer system released less protein than the conventional MAD system
and the addition of the second anaerobic step - especially with system An/Aer/An â B
(discharge from aerobic reactor) - greatly reduced protein, resulting in improved
dewaterability and less polymer demand. An/Aer/An (both of the options: A and B) had
lower CST than single MAD (both 15d and 20d SRT) and Ana/Aer. Compared to Ana/Aer, a reduction of 52% for An/Aer/An â A and 20% for An/Aer/An â B in polymer dose requirement was observed, indicating improved dewatering characteristics. The An/Aer/An â B has higher biosolid cake concentration than MAD or Ana/Aer. The
results showed that An/Aer/An (both options: A and B) biosolid had lower odor generation potential than single MAD (15d and 20d SRT) or Ana/Aer. Of all the stages,the An/Aer/An â A and â B system, generated odor which peaked at shorter time and lasted for shorter duration of time.
Master of Science
Halvarsson, Björn. "Interaction analysis and control of bioreactors for nitrogen removal." Licentiate thesis, Uppsala universitet, Avdelningen för systemteknik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-85853.
Full textYan, Qingmei. "Biological nitrogen removal of saline wastewater by ammonium oxidizers." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42182116.
Full textHamilton, Ryan K. "Modeling biological nitrogen removal with denitrification enzyme parameter estimation." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0012002.
Full textRycewicz-Borecki, Malgorzata. "Stormwater Bioretention: Nitrogen, Phosphorous and Metal Removal by Plants." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4597.
Full textJensen, Keith R. "Effects of Integrated Fixed Film Activated Sludge on nitrogen removal in biological nutrient removal systems." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01312009-063219/.
Full textFlynn, Nicola Jane. "Nitrogen interactions between floodwater and floodplain soils." Thesis, Royal Holloway, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311972.
Full textCodal, Ahmet. "Modeling Of Nitrogen Removal In A Membrane Biological Treatment Process." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610212/index.pdf.
Full textthe reason for this might be the inadequate available data on nitrification-denitrification process occurring in the system.
Chipello, Peter Luke, and Peter Luke Chipello. "Nitrogen removal and transformations during simulated soil aquifer treatment (SAT)." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/626907.
Full textGut, Luiza. "Assessment of a partial nitritation/Anammox system for nitrogen removal." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-604.
Full textKyambadde, Joseph. "Optimizing processes for biological nitrogen removal in Nakivubo Wetland, Uganda /." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134.
Full textTraband, Jason John. "Removal of wastewater nitrogen and phosphorus by an oligohaline marsh." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/255.
Full textThesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
楊龍元 and Lung-yuen Christopher Yeong. "Removal of wastewater cod and nitrogen using fibrous packing media." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210636.
Full textMalovanyy, Andriy. "Anammox-based systems for nitrogen removal from mainstream municipal wastewater." Doctoral thesis, KTH, Mark- och vattenteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202960.
Full textQC 20170309
Whichard, David P. "Nitrogen Removal From Dairy Manure Wastewater Using Sequencing Batch Reactors." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34412.
Full textMaster of Science
Guan, Lu. "Nitrogen Removal from Closed Aquaculture System by Bio-electrochemical System." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/91468.
Full textMS
MENG, YUANHANG. "NITROGEN REMOVAL UPGRADE OF TWO PILOT-SCALE WASTEWATER TREATMENT PLANTS." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1171931949.
Full textScott, Daniel. "Biological Nitrogen Removal in a Gravity Flow Biomass Concentrator Reactor." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1298323356.
Full textSamuelsson, Pär. "Modelling and control of activated sludge processes with nitrogen removal." Licentiate thesis, Uppsala universitet, Avdelningen för systemteknik, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-86006.
Full textYeong, Lung-yuen Christopher. "Removal of wastewater cod and nitrogen using fibrous packing media /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13193429.
Full textBaloch, Muhammad Imran. "Carbon and nitrogen removal in a granular bed baffled reactor." Thesis, Abertay University, 2004. https://rke.abertay.ac.uk/en/studentTheses/bab9fa75-37e0-481b-b442-33a5793515c3.
Full textPeng, Wei. "Digestate application in landfill bioreactors: Nitrogen removal and digestate stabilization." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3427186.
Full textMARAZZI, FRANCESCA ALICE. "Growth of microalgal biomass on supernatant from biosolid dewatering." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158195.
Full textThis thesis deals with the feasibility of including a mixed microalgal community in a real wastewater treatment sequence with the double aim of removing nitrogen and producing biomass to feed the anaerobic digesters. In particular, this thesis focuses on identification of relevant waste streams from agricultural and municipal activities (like effluents, centrates, digestates, and a mixture of them) as a substrate for microalgal culture. Chapter 2 contains a critical review, this manuscript summarizes the current approaches to microalgal biomass production using waste streams, including wastewater, waste or CO2-enriched gas (flue gas and biogas), waste organics (i.e., crude glycerol) and waste heat, as well as the primary common operational challenges and corresponding mitigation strategies involved in culturing approaches. The core of experimentation is described in Chapters 3-7 using wastewater from urban or agriculture activity as a substrate for microalgal culture. In particular, Chapter 3 shows the results of experimentation using municipal centrate to produce biomass to feed the anaerobic digesters removing at the same ammonia nitrogen. The novelty of the study consists in the use of raw centrate from urban wastewater treatment plant as a substrate to grow microalgae, while the majority of literature data were obtained on pre-treated (diluted and/or supplemented and/or furtherly clarified) centrate samples, in the use of a continuously fed PhotoBio Reactor (PBR) operated under natural, uncorrected environmental conditions. This work demonstrates that microalgae (Chlorella sp and Scenedesmus sp) are able to easily grow on the centrate. The average specific growth rate in indoor and outdoor batch tests is satisfactory and comparable with literature data, ranging between 0.14-0.16 d-1. During the continuous test the average biomass production is 50 mgTSS L-1 d-1 and the difference between N-NH4 concentration in the influent and in the effluent demonstrates an important removal. Also BMP tests showed good results: the production of biomethane from algal biomass is slower than from sludge, but its final value is slightly higher than that from waste sludge (208 mLCH4 gVS-1 vs. 190 mLCH4 gVS-1). Wastewaters from agricultural activities are the subject of Chapter 4, chemical and physical analyses showed that the liquid fractions of swine manure and the first effluent could be suitable for algal treatment, while the other samples had unacceptable levels of both solid content and turbidity which would seriously limit light penetration. The papers in Chapter 4 and Chapter 5 report the results obtained in lab-scale tests using the agro wastes which had been shown to be more suitable. In Chapter 5 a new approach is proposed using Activated Carbon (AC) from wood as a pre-treatment to facilitate microalgal growth, without addition of tap water for dilution. The optimal optical density values were obtained with 40 g L-1 of AC dosage and 10 minutes adsorption time, corresponding to 88% of turbidity reduction. Then semi-continuous microalgae culturing were tested using adsorbed and not adsorbed liquid centrate (3 replicates). The encouraging lab scale results presented in Chapter 4 and Chapter 5 justify further pilot-scale experimentation, using agrowastes as the nutrient source for microalgae, presented in Chapter 6. The pilot scale (PBR) was installed at a piggery farm in Northern Italy. During the culturing period, microalgal density remained quite constant, around the average value of 0.55 gTSS/L, and the efficiency of Total Nitrogen and of N-NH4+ removal were both very high (on average 80 and 87%, respectively). The search for the best biomass harvesting technique is the main objective of Chapter 7. In this point, microalgal biomass is processed by three solid/liquid separation processes: gravity settling; centrifugation tests, flocculation tests. The main conclusions are reported in Chapter 8.
Kallner, Bastviken Sofia. "Nitrogen removal in treatment wetlands : Factors influencing spatial and temporal variations." Doctoral thesis, Linköpings universitet, Ekologi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7564.
Full textWójcik, Weronika. "Evaluation of microbiological activity during the deammonification process for nitrogen removal." Thesis, KTH, VA-teknik, Vatten, Avlopp och Avfall, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300.
Full textBastviken, Sofia. "Nitrogen removal in treatment wetlands : factors influencing spatial and temporal variations /." Linköping : Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7564.
Full textHallin, Sara. "Dynamics of denitrifying populations in activated sludge processes with nitrogen removal /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1998. http://epsilon.slu.se/avh/1998/91-576-5539-1.gif.
Full textChen, Wen. "A membrane bioreactor(MBR) for an innovative biological nitrogen removal process." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39557959.
Full textChen, Wen, and 陳雯. "A membrane bioreactor(MBR) for an innovative biological nitrogen removal process." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39557959.
Full textHanson, Carter Curtis. "Temporal effect on nitrogen removal in a subsurface flow constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1027117.
Full textDepartment of Natural Resources and Environmental Management
Matheson, Fleur Elizabeth. "Nitrogen removal and the fate of nitrate in riparian buffer zones." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3810/.
Full textBrooker, Michael R. "The Wetland Dilemma: Nitrogen Removal at the Expense of Methane Generation." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376418382.
Full textClayton, John Andrew. "Denitrification kinetics in biological nitrogen and phosphorus removal activated sludge systems." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/21139.
Full textChui, Peng-Cheong. "STUDY ON ORGANICS AND NITROGEN REMOVAL USING SUBMERGED FIXED-BED FILTERS." Kyoto University, 1999. http://hdl.handle.net/2433/181847.
Full textLegwaila, Gabatshele Mbona. "Effects of panicle removal and nitrogen on yield of grain sorghum." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06162009-063221/.
Full textGihring, Thomas M. "Direct determination of nitrogen removal rates and pathways in coastal ecosystems." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-05082009-110340/.
Full textAdvisor: Joel Kostka, Florida State University, College of Arts and Sciences, Dept. of Oceanography. Title and description from dissertation home page (viewed on Oct. 5, 2009). Document formatted into pages; contains xiv, 142 pages. Includes bibliographical references.
Robiglio, Alessio. "Nitrogen removal from municipal wastewater by mainstream Partial Nitritation/Anammox process." Thesis, KTH, Vatten- och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235919.
Full textRedmond, Eric. "Nitrogen removal from wastewater by an aerated subsurface flow constructed wetland." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2971.
Full textBerge, Nicole. "IN-SITU AMMONIA REMOVAL OF LEACHATE FROM BIOREACTOR LANDFILLS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3281.
Full textPh.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering