title: Inhibition of nitrification in municipal wastewater-treating photobioreactors: Effect on algal growth and nutrient uptake.
abstract: The effect of inhibiting nitrification on algal growth and nutrient uptake was studied in photobioreactors treating municipal wastewater. As previous studies have indicated that algae prefer certain nitrogen species to others, and because nitrifying bacteria are inhibited by microalgae, it is important to shed more light on these interactions. In this study allylthiourea (ATU) was used to inhibit nitrification in wastewater-treating photobioreactors. The nitrification-inhibited reactors were compared to control reactors with no ATU added. Microalgae had higher growth in the inhibited reactors, resulting in a higher chlorophyll a concentration. The species mix also differed, with Chlorella and Scenedesmus being the dominant genera in the control reactors and Cryptomonas and Chlorella dominating in the inhibited reactors. The nitrogen speciation in the reactors after 8 days incubation was also different in the two setups, with N existing mostly as NH4-N in the inhibited reactors and as NO3-N in the control reactors.
authors.affiliation: School of Business, Society and Engineering, Mälardalen University, P.O. Box 883, SE-721 23 Västerås, Sweden. Electronic address: ivo.krustok@mdh.se.
authors.forename: I
authors.initials: I
authors.lastname: Krustok
authors.affiliation: School of Business, Society and Engineering, Mälardalen University, P.O. Box 883, SE-721 23 Västerås, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Odlare
authors.affiliation: Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, 51014 Tartu, Estonia.
authors.forename: J
authors.initials: J
authors.lastname: Truu
authors.affiliation: School of Business, Society and Engineering, Mälardalen University, P.O. Box 883, SE-721 23 Västerås, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Nehrenheim
mesh_terms: D002708:Chlorella / Q000254:growth & development / Q000378:metabolism; D002734:Chlorophyll / Q000031:analogs & derivatives / Q000378:metabolism; D000077194:Chlorophyll A; D002947:Cities; D005502:Food; D058086:Microalgae / Q000254:growth & development* / Q000378:metabolism*; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism*; D058433:Photobioreactors / Q000382:microbiology; D044444:Scenedesmus / Q000254:growth & development / Q000378:metabolism; D018505:Waste Management; D062065:Wastewater / Q000382:microbiology; D018508:Water Purification / Q000379:methods
chemical_list: D002734:Chlorophyll; D000077194:Chlorophyll A; D009584:Nitrogen; D062065:Wastewater; C085815:chlorophyll a'
keywords: Algal–bacterial interactions; Microalgae; Nitrification; Photobioreactors; Wastewater treatment