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Author:Ahlgren, Pia
Title:Biodegradation of potentially harmful compounds in wastewater treatment
Biologisk nedbrytning av potentiellt skadliga föreningar i avloppsrening
Publication type:Master's thesis
Publication year:2012
Pages:[14] + 91 + [10]      Language:   eng
Department/School:Yhdyskunta- ja ympäristötekniikan laitos
Main subject:Vesihuoltotekniikka   (Yhd-73)
Supervisor:Vahala, Riku
Instructor:Rantanen, Pirjo
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

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Location:P1 Ark Aalto     | Archive
Keywords:biodegradation
ibuprofen
PHC
SBR
wastewater treatment
avloppsrening
biologisk nedbrytning
ibuprofen
SBR
skadliga föreningar
Abstract (eng): To study Potentially Harmful Compounds (PHCs) in the environment and their fate in Wastewater Treatment Plants (WWTPs) is a growing area of interest among researchers.
Persistent Organic Pollutants (POPs) and Endocrine Disruptive Compounds (EDCs) are a concern together with Pharmaceuticals and Personal Care Products (PPCP).
While advanced treatments are being considered, the fate of compounds in activated sludge is important to understand.
Biodegradation is the only way of entirely removing PHCs in WWTPs and stopping them from ending up in the environment.

In this thesis a laboratory scale Sequencing Batch Reactor (SBRs) with four parallel reactors was built and the operation optimized.
Sludge from the Suomenoja WWTP was used to start the reactors and they were then fed with synthetic wastewater.
The operational conditions were chosen to be typical values in Finnish WWTPs.
A marker compound, ibuprofen, was chosen to be studied in the reactors.
The objective was to verify laboratory procedures and obtain a primary biodegradation rate and biodegradation rate constant of the compound.
Ibuprofen is a non-steroidal acidic anti-inflammatory drug that is largely used in Finland and found in environmental waters as well as in WWTPs.

The synthetic wastewater was spiked with ibuprofen on four occasions.
Samples from the reactors were taken at different times during aeration to analyse the ibuprofen concentration.
This way the biodegradation rate and biodegradation rate constant (kbiol) was determined for ibuprofen in the SBRs.
The average biodegradation of ibuprofen in the reactors was 30-50%.
A kbiol value of 1.91/gSS/d was obtained.
The values obtained in the study were in good agreement with previous studies.
The slightly lower value for the constant could possibly be explained by the high F/M-ratio.
Further research on the biodegradation mechanisms and the effect of different treatment conditions are needed to optimize the removal of ibuprofen.
Also the accuracy of the analyses needs to be improved.
Abstract (swe): Att studera potentiellt skadliga föreningar i naturen och i avloppsreningsverk har under senaste åren blivit en prioritet bland forskare.
Långlivade organiska föreningar. så kallade POPs, föreningar som stör det endokrina systemet (EDCs), läkemedel och ämnen i hygienprodukter och kosmetika är ett växande bekymmer.
Att studera dessa ämnens öde i avloppsreningsverk, speciellt aktivslamprocessen, är viktigt före man beslutar ifall mer avancerade reningsmetoder ar nödvändiga att implementera.
Biologisk nedbrytning är det enda sättet att totalt eliminera potentiellt skadliga föreningar i avloppsreningsverk och hindra dem ifrån att hamna i naturen.

I detta diplomarbete byggdes ett satsvis biologiskt reningsverk (SBR) i laboratorieskala med fyra parallellreaktorer och deras funktion optimerades.
Processen startades med slam från Finnå avloppsreningsverk varefter reaktorerna matades med syntetiskt avloppsvatten.
Förhållanden, där reaktorerna opererade, var valda för att bäst representera förhållanden i finska avloppsreningsverk.
En förening, ibuprofen, valdes för att fungera som markör och studerades i processen.
Syftet var att verifiera provtagningsmetoderna i laboratoriet och fa preliminara varden för biologisk nedbrytning av ibuprofen.
Ibuprofen är en icke-steroid antiinflammatorisk medicin som används allmänt och som sedan har hittats i vattendrag och i avloppsreningsverk i Finland.

Ibuprofen tillsattes i det syntetiska avloppsvattnet fyra gånger under studieperioden.
Sampel från reaktorerna togs vid olika tider under luftningsfasen för att sedan kunna bestämma den biologiska nedbrytningen och nedbrytningskoefficienten.
Ibuprofen nedbröts i medel 30-50% och därav kunde en biologisk nedbrytningskoefficient (kbiol) på 1.91/gSS/d bestämmas.
Dessa värden stämmer bra överens med värden från tidigare studier.
Att nedbrytningskoefficienten dock var lite lägre än i andra studier, kan ha berott på den höga slambelastningen.
Fortsatta studier på mekanismer bakom biologisk nedbrytning av ibuprofen behövs för att ytterligare optimera dess eliminering i avloppsreningsverk.
Det krävs även bättre analysnoggrannhet för att erhålla exakta värden på nedbrytningen.
ED:2012-09-07
INSSI record number: 45229
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