Utilization of domestic wastewater as a water source of Tetradesmusobliquus PF3 for the biological removal of nitric oxide. (July 2020)

• Record Type: Journal Article
• Authors: Ma, Shanshan; Yu, Yanling; Cui, Hao; Li, Jiang; Feng, Yujie
• Is Part Of: Environmental pollution. Volume 262(2020)
• Publication Date: 2020-07
• Subjects: Domestic wastewater -- Microalgae -- Water source -- Reduction -- Tetradesmus obliquus -- Nitrogen oxide; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.114243
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The reduction of nitrogen oxide (DeNOx) from flue gas by microalgae is a promising technology that has attracted increasing attention. Because the water source is a major limitation of microalgae application in the DeNOx from flue gas, we investigated the feasibility of using domestic wastewater (WW) as a water source. As a result, a biomass accumulation rate of 0.27 ± 0.01 mg L −1 d − 1 was achieved by Tetradesmus obliquus PF3 cultivated in WW for 8 d, and 30 mg L −1 of nitrate nitrogen was added to the WW to fulfill the nutrient requirements of the microalgae cells. The ammonium (NH4 + ) nitrogen present in WW exerted inhibitory effects on the removal of nitric oxide (NO), thereby leading to 8% decrease removal efficiency in comparison with that using clean water and nutrients (BG11 medium). However, these inhibitory effects disappeared following the exhaustion of NH4 + by T . obliquus PF3 after 1 d. To overcome the inhibition of NH4 + and to achieve a high NO removal efficiency, a strategy of connecting two reactors in series was presented. The removal efficiency of NO by the two series reactors reached up to 71.2 ± 2.9%, which was significantly higher than that obtained by a single reactor (43.1 ± 3.6%). In addition, 70.9 ± 4.8% of the supplied NO was fixed into microalgae cells in the two reactors, which was 1.75 times higher than that in the single reactor (40.6 ± 5.1%), thereby suggesting that connecting two reactors in series rendered effective recovery of NO from flue gas using WW as a water source. In this study, we provided an economically viable water source for the application of microalgae in the biological DeNOx from flue gases. Graphical abstract: Image 1 Highlights: Ammonium in domestic wastewater was found inhibitory to NO removal by microalgae. Extra 30 mg L −1 nitrate-N addition stabilized NO removal in 8 days. Two reactors in series solved the ammonia inhibition problem and promoted NO removal. Abstract : The study provided an economically viable water source (domestic wastewater) for the application of microalgae in the biological DeNOx of flue gases.