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Innovative Control Strategies for the Partial Nitritation/Anammox Wastewater Treatment Process
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The project undertaken in this thesis was proposed by IVL Swedish Environmental Research Institute and performed at their R&D facility Hammarby Sjöstadsverk as a part of the EU funded research project R3 Water. A single stage partial nitritation/Anammox system in a moving bed biofilm reactor (MBBR) was controlled using oxidation reduction potential (ORP) in order to evaluate its utility as control parameter. The system was operated in 10 periods under a combination of several different pH levels (7, 7.5, 8), nitrogen loads (1, 2.5, 4 gN/m2/d), and ORP (-70, 0, 70 mV) values following a 2n full factorial design. The results were then interpreted using the design of experiment software MODDE in order to find the optimal operating conditions. Stable operation and acceptable levels of nitrogen removal (>80%) were achieved for three periods where the common factor was an ORP value of 70 mV. The highest nitrogen removal rate (83.7%) was found when the test conditions were pH 8, nitrogen load 1 gN/m2/d, and ORP 70 mV. The economic performance of each period was also evaluated and it was found that the optimal point, in terms of aeration and of the three periods with sufficient removal efficiencies, was the same as the optimal removal conditions except with a pH of 7. The resulting cost was 0.0046 SEK/gN removed. A secondary test was performed in order to directly compare the performance of ORP with dissolved oxygen (DO) as a control parameter. It was found that DO significantly outperformed ORP under identical test conditions, yielding a higher nitrogen removal rate (78.2% vs. 65.3%) as well as significantly less aeration energy.

Abstract [sv]

Denna rapport beskriver ett projekt som genomförts vid IVL Svenska Miljöinstitutet, Hammarby Sjöstadsverk, som en del av EU-projektet R3 vatten. En enstegs- partiell nitritation / Anammox systemet i en rörlig bädd biofilm reaktor (MBBR) kontrollerades med hjälp av oxidation reduktionspotentialen (ORP), och OPR som som styrparameter utvärderades. Systemet drevs i 10 perioder vid flera olika pH-nivåer (7, 7.5, 8), kvävelaster (1, 2,5, 4 gN / m2 / d), och ORP-värden (-70, 0, 70 mV) enligt en fullständing 2n faktordesign. Resultaten tolkades därefter med hjälp av programvaran MODDE (försöksplanering) för att hitta de optimala driftsförhållandena. Stabil drift och acceptabla nivåer av kväverening (> 80%) uppnåddes under tre perioder där den gemensamma faktorn var ett ORP-värde på 70 mV. Den högsta kvävereningsfrekvensen (83,7%) konstaterades när testbetingelserna var pH 8, kvävebelastningen 1 gN / m2 / d och ORP 70 mV. Från en ekonomisk utvärdering av varje period framgick att den optimala punkten, när det gäller luftning vid tillräcklig borttagningseffektivitet, var densamma som de optimala betingelserna, förutom med ett pH-värde 7. Den resulterande kostnaden var 0,0046 SEK / gN. Ett sekundärt test utfördes för att direkt jämföra resultaten för ORP och löst syre (DO) som styrparametrar. DO visade ett signifikant bättre resultat än ORP under identiska testbetingelser, med en högre kväverening (78,2% mot 65,3%) och ett mindre behov av luftning.

Place, publisher, year, edition, pages
2016. , 35 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-191489OAI: oai:DiVA.org:kth-191489DiVA: diva2:956800
External cooperation
IVL
Supervisors
Examiners
Available from: 2016-08-31 Created: 2016-08-31 Last updated: 2016-08-31Bibliographically approved

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