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Dephosphorisation of Acidic Wastewater: Aimed to allow the recirculation of byproducts as slag builders
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This study was conducted to evaluate if Polonite® could remove Phosphorus from Sandvik’s wastewater that naturally forms during steelmaking, and hence be proficiently used as a precursor of the neutralization process of said steel plant.

Currently lime (CaO) is mixed with the wastewater which creates clean water and sediments, that later need to be landfilled. Due to the high Phosphorus content in the sediments these cannot be recycled back into the production, this result in a loss of important elements.

The aim is therefore to remove the Phosphorus to a target level of 1-2 [mg/L]. In fact, the Phosphorus present in the wastewater drifts in the solid particles derived by the neutralization process, impairing their possible recirculation as slag builders. To evaluate the purifying abilities of Polonite® a batch test and a column test were conducted. During the column test measurements of pH and conductivity were made. To analyze the composition, Inductively Coupled Plasma (ICP) tests were performed.

No clear correlation between the pH and the conductivity of the water could be established from the results. Overall the Polonite® removed high amount of Phosphorus from the wastewater. The target level of 1-2 [mg/L] Phosphorus was achieved in the batch test. Although, Polonite® also incidentally absorbed most of the Fluorine present in the wastewater making it a questionable choice for the process, as Fluorine is desirable in large quantities in the sediments if used as slag builders. As no ICP results were received from the column test only pH and conductivity are discussed.

Abstract [sv]

Denna studie utfördes för att utvärdera om Polonite® kunde rena Fosfor från Sandvik’s avfallsvatten som naturligt uppkommer från stålprocesserna, och använda det som ett försteg i neutraliseringsprocessen.

Idag blandas kalk (CaO) med avfallsvattnet vilket resulterar i rent vatten och sediment, dessa deponeras sedan. På grund av den höga halten Fosfor i sedimenten kan dessa inte återcirkuleras in i produktionen, detta leder till att viktiga ämnen går förlorade.

Målet är därför att sänka halten Fosfor till en nivå på 1-2 [mg/L]. Fosfor i avfallsvattnet driver i de fasta partiklarna från neutraliseringsprocessen, vilket förhindrar möjligheterna att återanvända dem som slaggbildare. För att utvärdera Polonites® reningsförmåga gjordes ett kolumntest och ett skaktest. Under kolumntestet mättes pH och konduktivitet. För att analysera innehållet i vattnet gjordes ICP-tester på det renade vattnet.

Inget tydligt samband mellan konduktiviteten och pH kunde fastställas från resultaten. Överlag hade Polonite® en hög grad av rening av Fosfor. Den givna mängden av Fosfor uppnåddes i skaktestet. Olyckligtvis hade Polonite® även en hög reningsgrad av Fluor som även fanns i avfallsvattnet, vilket gjorde Polonite® tvivelaktigt försteg i denna process, då Fluorrikt vatten är önskat för att kunna användas som slaggbildare. Då inga ICP-resultat har mottagits diskuteras enbart pH och konduktivitet för kolumntesterna.

Place, publisher, year, edition, pages
2018. , p. 33
Keywords [en]
Phosphorus removal, Use of Polonite®, Sustainable Metallurgy, Recycling, Neutralization of Wastewater.
Keywords [sv]
Fosforrening, Användning av Polonite®, Hållbar Metallurgi, Återvinning, Neutralisering av Avfallsvatten.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-231818OAI: oai:DiVA.org:kth-231818DiVA, id: diva2:1230098
External cooperation
AB Sandvik Materials Technology, Sandviken
Subject / course
Materials Science and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2018-05-15, Jernkontoret, Kungsträdgårdsgatan 10, Stockholm, 10:00 (English)
Supervisors
Examiners
Available from: 2018-07-03 Created: 2018-07-02 Last updated: 2018-07-03Bibliographically approved

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