title: Ammonia removal from anaerobic digestion effluent of livestock waste using green alga Scenedesmus sp.
abstract: The green alga Scenedesmus was investigated for its ability to remove nitrogen from anaerobic digestion effluent possessing high ammonium content and alkalinity in addition to its growth characteristics. Nitrate and ammonium were indistinguishable as a nitrogen source when the ammonium concentration was at normal cultivation levels. Ammonium up to 100ppm NH(4)-N did not inhibit cell growth, but did decrease final cell density by up to 70% at a concentration of 200-500ppm NH(4)-N. Inorganic carbon of alkalinity in the form of bicarbonate was consumed rapidly, in turn causing the attenuation of cell growth. Therefore, maintaining a certain level of inorganic carbon is necessary in order to prolong ammonia removal. A moderate degree of aeration was beneficial to ammonia removal, not only due to the stripping of ammonium to ammonia gas but also due to the stripping of oxygen, which is an inhibitor of regular photosynthesis. Magnesium is easily consumed compared to other metallic components and therefore requires periodic supplementation. Maintaining appropriate levels of alkalinity, Mg, aeration along with optimal an initial NH(4)(+)/cell ratio were all necessary for long-term semi-continuous ammonium removal and cell growth.
authors.affiliation: Dept. of Environmental Engineering and Biotechnology, Myongji University, Yongin, Republic of Korea.
authors.forename: Jongmin
authors.initials: J
authors.lastname: Park
authors.forename: Hai-Feng
authors.initials: HF
authors.lastname: Jin
authors.forename: Byung-Ran
authors.initials: BR
authors.lastname: Lim
authors.forename: Ki-Young
authors.initials: KY
authors.lastname: Park
authors.forename: Kisay
authors.initials: K
authors.lastname: Lee
mesh_terms: D000383:Agriculture / Q000379:methods; D000641:Ammonia / Q000302:isolation & purification / Q000378:metabolism*; D000693:Anaerobiosis / Q000502:physiology; D000818:Animals; D001673:Biodegradation, Environmental; D007220:Industrial Waste / Q000517:prevention & control*; D058751:Livestock; D044444:Scenedesmus / Q000378:metabolism*
chemical_list: D007220:Industrial Waste; D000641:Ammonia