Functionality of a novel pilot-scale freeze crystallizer in wastewater purification
Saeed, Muhammad Ahsan (2019)
Diplomityö
2019
School of Engineering Science, Kemiantekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2019101633131
https://urn.fi/URN:NBN:fi-fe2019101633131
Tiivistelmä
Freeze crystallization (FC) is an energy efficient purification process employed to get the high product purity. During FC solvent freezes out and left concentrate behind. This characteristic of freeze crystallization makes it potential contender for wastewater purification. It reclaims both water and other constituent simultaneously in a single purification stage.
In this research, the functioning of designed novel scraped surface freeze crystallizer was investigated. Experiments were made at 120 L batches with different streams. The presence of agitator and scraper in crystallizer hindered ice scale formation. The efficiency of the pilot-scale crystallizer was tested using sodium chloride solutions and landfill leachate. The purification efficiency calculations were based on amount of impurities found in produced ice and initial feed solution, e.g. landfill leachate. The average purification efficiency of 97% was achieved. In addition, recommendations to further development of the process are given.
In this research, the functioning of designed novel scraped surface freeze crystallizer was investigated. Experiments were made at 120 L batches with different streams. The presence of agitator and scraper in crystallizer hindered ice scale formation. The efficiency of the pilot-scale crystallizer was tested using sodium chloride solutions and landfill leachate. The purification efficiency calculations were based on amount of impurities found in produced ice and initial feed solution, e.g. landfill leachate. The average purification efficiency of 97% was achieved. In addition, recommendations to further development of the process are given.