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New possibilities of Magnesium utilization in wastewater treatment and nutrients recovery
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering. (VA-teknik; Vatten, Avlopp och Avfall, Water, Sewage and Waste technology)
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

New possibilities of nutrients removal by additions of magnesium compounds were studied in primary treatment and supernatant of side stream in wastewater treatment. The precipitation product from this method is magnesium ammonium phosphate (MAP) socalled struvite. High efficiencies on NH4-N and PO4-P removals have been demonstrated up to over 90 % respectively in side stream from dewatering of digested sludge. In order to find out the nutrient removal efficiency in raw wastewater and the feasibility of MAP recycling in wastewater treatment, the postulations of combining MAP and nitrification-denitrification process, and MAP and partial nitritation-anmmox process were carried out by experimental works in the laboratory at Land and Water Resources Department, KTH. It was found that 92-97 % of PO4-P and 57 % of NH4-N were removed from raw wastewater by Mg2+ addition at pH10 to pH10.5. The research work revealed that recycling of MAP by nitrification-denitrification and partial nitritation-anmmox processes may be a feasibly process combination. In MAP and nitrification -denitrification process, the released ammonium was mostly oxidized to nitrate in nitrification phase and ready for denitrification. Based on presented results on MAP and partial nitritation-anmmox process, it was found that the released ammonium was consumed by anammox bacteria.

Place, publisher, year, edition, pages
2009. , 38 p.
, TRITA-LWR Degree Project, ISSN 1651-064X ; LWR-EX-09-29
Keyword [en]
Ammonium, ANAMMOX, Magnesium ammonium phosphate, nitrification, phosphate, wastewater
National Category
Water Engineering
URN: urn:nbn:se:kth:diva-12134OAI: diva2:302586
Subject / course
Water, Sewage and Waste
Educational program
Degree of Master - Water System Technology
2009-08-27, 00:00 (English)
Available from: 2010-03-11 Created: 2010-03-08 Last updated: 2012-02-16

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