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Algal Flue Gas Sequestration and Wastewater Treatment: An Industrial Experiment
KTH, School of Industrial Engineering and Management (ITM), Industrial Ecology.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

CJP Solutions och Waste Handling and Management (WHAM) är två företag i Melbourne, Australien, som utvecklar en process för återvinning av bioslam från Melbourne Waters reningsverk. Slammet är förorenat med metaller från industriellt avloppsvatten som har behandlats tillsammans med det kommunala avloppsvattnet. Företagen sökte en hållbar biologisk process inkluderande alger för att rena och fånga in rökgaser från pyrolisering och förbränning av det förorenade slammet. I det här examensarbetet har en teknisk lösning utformats, tillverkats och experimentellt prövats på plats under tjugo veckor i Melbourne, med mål att: mäta gas- och vattenreningsprestanda.

Efter åtta veckors inledande litteraturstudie omfattande koldioxidinfångst samt algbiologi med industriell tillämpning fattades beslut om att i första hand använda mikroalgen

Chlorella vulgaris, för dess robusta egenskaper samt potential för snabb tillväxt. Utöver Chlorella v. odlades en blandning lokala algkulturer tillsammans med Chlorella v. fram, och prövades parallellt vid de efterföljande experimenten. Experimenten utfördes under tre veckor vid energiföretaget AGLs biogasdrivna kraftvärmeverk, på Melbourne Waters Western Treatment Plant. I experimentet leddes orenade rökgaser genom ett system för kylning, filtrering och kompression, till algodlingarna. Algodlingarna var utformade i två separata system, det ena bestående av sju vertikala 25 liters plastkolonner, det andra av en 250 liters bassängodling. Systemen blandades genom luft- och rökgasinsprutning, samt genom mekaniserad omrörning. Algerna odlades i delvis renat avloppsvatten. Val av tekniska lösningar baserades på låga omkostnader, enkel konstruktion, komponenternas tillgänglighet, samt en tre veckors tidsfrist till att utforma och tillverka systemen.

Abstract [en]

CJP Solutions in collaboration with Waste Handling and Management (WHAM), two companies based in Melbourne, Australia, are currently developing a process to treat and recycle biosolids left over from the wastewater treatment process at Melbourne Water’s Western Treatment Plant. The biosolids are contaminated with heavy metals from industrial wastewater, being treated together with municipal wastewater. The companies are looking for a sustainable solution for sequestering flue gases from pyrolysis of the biosolids, into an algal biomass. In this Master Thesis project, a technical solution has been designed, constructed and tested on site over the course of twenty weeks in Melbourne, the goal being to determine gas and water cleanup performance.

After eight weeks of initial literature review covering CO

2-sequestration and industrial applications of algae cultivation, the microalgae Chlorella vulgaris was chosen as the main strain to be used, due to it being robust and having a high growth rate. In addition to the Chlorella v. culture, a mix consisting of local algae cultures together with Chlorella v. was also cultivated throughout the experiments. The experiments were carried out during three weeks at AGL’s biogas power plant, at the Western Treatment Plant. Untreated exhaust gas was led through a system of cooling, filtration, and compression, into the two separate algal culture systems. One consisted of seven 25 litre plastic column reactors, the other of a 250 litre pond reactor. The systems were mixed through air bubbling, exhaust gas inlet, as well as by a mechanical stirrer in the pond reactor. The algae were grown in partially treated wastewater. Factors determining the system design included simplicity in construction, use of cheap, available materials, as well as a three week design and construction deadline.

Place, publisher, year, edition, pages
2011. , 89 p.
Series
Trita-IM, ISSN 1402-7615 ; 2011:05
Keyword [en]
industriell ekologi, industrial ecology
National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:kth:diva-32146OAI: oai:DiVA.org:kth-32146DiVA: diva2:409198
Subject / course
Industrial Ecology
Educational program
Master of Science - Sustainable Technology
Uppsok
Technology
Supervisors
Examiners
Note
www.ima.kth.seAvailable from: 2011-04-07 Created: 2011-04-07 Last updated: 2012-01-25Bibliographically approved

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