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Nutrient recovery in a smallscale wastewater treatment plant in cold climate
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
2006 (English)In: Vatten, ISSN 0042-2886, Vol. 62, no 4, p. 355-368Article in journal (Other academic) Published
Abstract [en]

An onsite wastewater treatment plant at Brändön, north of Luleå, receiving primarily treated wastewater from a village, was operated and investigated during one year. The wastewater flow was 0.5 m3/d. The main treatment steps were a prefilter, mainly to distribute the flow, a vegetation filter consisting of two different clones of Salix and two phosphorus filters with Filtralite-P and blast furnace slag (BF slag) operated in parallel. The willow bed reduction of BOD7 was in average about 80% and of phosphorus (P) and nitrogen (N) 20-30%. The main mechanism was believed to be filtration in the bed. The reduction through plant uptake was minor. The Filtralite-P filter reduced BOD7, P and N with 67%, 72% and 20%, respectively. The BF slag filter reduced P and N with 53% and 3%, respectively. The release of sulphuric compounds from the BF slag filter increased the BOD7 content in the effluent. The Filtralite-P system achieved the requirements of the normal protection level given by the Swedish Environmental Protection Agency but not all of the requirements of the high protection level. The BF slag system did not fullfil the requirements of the two protection levels.

Abstract [sv]

En småskalig avloppsanläggning har testats i Brändön norr om Luleå under ett år. 0,5 m3/d slamavskiljt vatten från samhället pumpades till försöksanläggningen som bestod av ett förfilter för att sprida vattnet följt av en sälgbädd och två paralella fosforfilter med Filtralite-P och masugnsslagg. I sälgbädden reducerades BOD7 med 80% medan fosfor- och kväveinnehållet minskade med 20-30%. Huvudsaklig mekanism bedömndes vara filtrering i bädden medan växtupptaget var av ringa storlek. Filtralite-P filtret reducerade BOD7 med 67%; fosfor och kväve med 72% och 20 respektive. Masugnsslaggen minskade fosforinnehållet med 53% och kväveinnehållet med 3%. BOD7-innehållet ökade däremot påtagligt genom slaggfiltret beroende på reducerade svavelkomponenter som frigjordes från slaggen. Systemet med Filtralite-P som adsorbent uppfyllde Naturvårdsverkets krav på normal men inte hög skyddsnivå. Systemet med BF slagg uppfyllde inte dessa krav.

Place, publisher, year, edition, pages
2006. Vol. 62, no 4, p. 355-368
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4964Local ID: 2f883630-4b13-11dc-ac5f-000ea68e967bOAI: oai:DiVA.org:ltu-4964DiVA, id: diva2:977838
Note
Godkänd; 2006; Bibliografisk uppgift: Återvinning av näringsämnen i en småskalig avloppsanläggning i kallt klimat; 20070815 (learas)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Amofah, Lea RastasHanaeus, Jörgen

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